The management of knee pain secondary to meniscal tears with osteoarthritis is limited by the poor inherent healing potential of the meniscus. Previous studies have reported on the benefit of autologous micro-fragmented fat as a therapeutic for various knee pathologies. The goal of this prospective pilot study was to determine the safety and potential treatment effect of micro-fragmented adipose tissue injection for patients with knee pain secondary to osteoarthritis and meniscal tears who have failed conservative management.
Twenty subjects with knee pain secondary to osteoarthritis with associated meniscal tear after failed conservative management were enrolled in the study. Numeric Pain Scale (NPS) and Knee Injury and Osteoarthritis Outcome Scale (KOOS) following ultrasound-guided intra-meniscal and intra-articular micro-fragmented adipose tissue injections were examined at three, six and 12 months.
The mean NPS revealed a significant decrease in patient pain at the 1-year time point compared with baseline (5.45 to 2.21, p < .001). Similarly, overall, mean KOOS symptoms significantly improved from 57.7 to 78.2 (p < .001), with all 4 KOOS subscales demonstrating significant improvement at the final one year follow-up. One subject developed uncomplicated cellulitis at the harvest site which was treated with oral antibiotics. Other complications were minor and mostly limited to adipose harvest.
This study demonstrated that micro-fragmented adipose tissue injected directly into a torn meniscus and knee joint using ultrasound guidance represents a safe and potentially efficacious treatment option for patients with knee pain suffering from degenerative arthritis and degenerative meniscal tears. A larger, randomized, controlled trial is warranted to determine efficacy.
Clinicaltrials.org Identifier: NCT03714659
Meniscus tears are a common injury, with an estimated annual incidence as high as 60–70 per 100,000 . Tears interfere with vital functions  of the meniscus and increase the risk of developing knee osteoarthritis . Degenerative, as opposed to traumatic, meniscus tears are commonly found in association with osteoarthritis in patients over the age of 40. Depending on the severity of the tear and other indications, treatment typically starts with conservative methods (physical therapy, pain medications, etc.), then surgical methods, such as arthroscopic partial meniscectomy (APM), are recommended. The optimal management of these degenerative tears remains a challenge given the poor healing capacity of the inner, avascular portion of the meniscus where direct surgical repair techniques are commonly unsuccessful . Unfortunately, APM has shown limited utility in improving knee pain and function in patients with degenerative meniscus tears when compared with exercise, especially in the setting of degenerative arthritis . The lack of treatment alternatives for patients who have failed conservative management has increased the need for other non-operative treatments such as orthobiologics.
Orthobiologic treatments using platelet-rich plasma (PRP) injections of meniscus tears have been studied with mixed results. Mesenchymal stromal cell (MSC)–based therapies are potential candidates to meet the challenge of meniscal healing. MSCs act as trophic mediators by secreting a variety of cytokines and growth factors, which have been found to inhibit fibrosis and apoptosis, enhance angiogenesis, and stimulate the differentiation of tissue-intrinsic reparative or stem cells . MSCs harvested from adipose  have been used for orthopaedic applications, and recent studies have demonstrated successful treatment of meniscal tears with adipose-derived stem cells .
Autologous, micro-fragmented adipose tissue (MFAT) may be harvested, processed, and transferred in a closed cylindrical system while preserving and enhancing the natural healing potential of adipose graft . The process uses mild mechanical forces to both micro-fragment the adipose and wash away any pro-inflammatory oil and blood residues without the use of enzymes, additives, or separation centrifugation, while preserving the microarchitecture . An essential part of that intact microarchitecture is the stromal vascular niche where pericytes are located. After injury or damage to the capillary wall, pericytes can detach and gradually convert into activated MSCs . Although the exact mechanism of action is not fully understood, improvement in pain and function scores following intra-articular injection of MFAT has been reported in the setting of knee osteoarthritis and meniscal tear . The rationale for considering MFAT injection over PRP and bone marrow aspirate is that the adipose tissue serves as a tissue filler in defects such as torn meniscus and cartilage lesions in addition to the noted potential anti-inflammatory and healing effects.
The aim of this pilot study was to determine the safety and potential treatment effect of MFAT as a treatment option for patients with knee pain secondary to osteoarthritis. After treatment with MFAT for knee pain, patients were assessed for procedure-related adverse events and for clinically meaningful changes in knee function and pain. The preliminary data from this study would ultimately be used in the development and management of a larger randomized controlled trial.
This study received Institutional Review Board approval from the Institute of Regenerative and Cellular Medicine (LG-MN-201) and was registered with Clinicaltrials.org (Registration Number: NCT03714659). A total of 20 subjects were recruited to the study who were evaluated for knee pain at the clinic between January 2016 and January 2017. Inclusion criteria included age 35 and older; knee pain associated with symptoms of knee osteoarthritis or torn meniscus (i.e., localized joint line clicking, popping, giving way, pain with pivot or torque, episodic pain); joint line pain on palpation; subjective pain at the medial or lateral joint line for at least three months; MRI or arthroscopic evidence of meniscal tear; and failed conservative treatment. MRI evidence of meniscal tear was confirmed via community radiologists’ interpretation. Conservative treatment was defined as any combination of the use of anti-inflammatory or other medications for pain, physical therapy, corticosteroid injections, and/or hyaluronic acid (HA) injections. This also included patients who were told that they were a candidate for arthroscopic surgery by an orthopaedic surgeon due to the failure of conservative measures. Exclusion criteria included diffuse knee pain; chronically locked knee; history of prior knee surgery; assessment determining pathology requiring surgical management other than meniscal tear; treatment with PRP, cortisone (oral or injected), or HA injection within six weeks; malignancy within five years; or any disease or condition that may hinder or conflict with treatment. Though the criteria only required that the patients not receive any PRP, cortisone, or HA injections for six weeks prior to the study, no patients were previously treated with PRP or cortisone and no patient received HA injections within three months of the study, ensuring that any benefits from these injections did not affect study outcomes. Patients presenting with post-traumatic lesions of the meniscus were also excluded in order to maintain uniformity in the patient groups. Also considered were any contra-indications to lipo-aspiration such as history of bleeding disorder, infection, pregnancy, or allergies to anaesthetic agents.
All patients meeting inclusion criteria during the study period were invited to participate. Upon agreement and signing of an informed consent form, baseline demographic data were collected (i.e., age, sex, body mass index [BMI]). The type of meniscal tear and location was noted based on MRI results. Baseline Numerical Pain Scale (NPS) and Knee Injury and Osteoarthritis Outcome Score (KOOS) subscale scores were collected. Patients were then scheduled for a treatment date and were restricted from taking steroids or non-steroidal anti-inflammatory medications for three days prior to treatment. Patients were seen for initial follow-up at four weeks. They then completed surveys at three, six and 12 months, including the KOOS subscales and NPS.
The NPS is one of the most common measures of pain intensity and is used frequently in both research and clinical practice. The scale is well-validated and reliable for determining the change in pain over time . Pain is rated on an 11-point scale, 0–10, with 0 representing “no pain” and 10 representing “worst imaginable pain.” It was well suited to this study given the ease of administration in person or via an online survey. The NPS minimum clinically important difference (MCID) for patients with knee pain secondary to osteoarthritis has been established as two points .
The KOOS is also widely used in research and clinical practice, including in large-scale databases and registries . It is intended to be used in the setting of knee pain or injury that can result in post-traumatic osteoarthritis, including meniscus tears. It can be used over short- and long-term intervals to assess change over time. It consists of five subscales: pain, other symptoms, function in activities of daily living (ADL), function in sports and recreation (Sport/Rec), and knee-related quality of life (QOL). The re-test reliability has been established in patients with knee injuries  and the MCID has been determined as 8–10 . We selected a change of greater than 10 on the KOOS as the MCID for this study. The primary endpoints of this study were changes in NPS and KOOS scores at 12 months.
The treatment intervention consisted of percutaneous trephination of the meniscus tear and injection with MFAT into the tear and joint, which was harvested using the Lipogems® processing kit (Lipogems International SpA, Milan, Italy). This disposable kit allows for the aspiration, processing, and re-injection of autologous MFAT without the need for expansion or enzymatic treatment. Patients were placed supine on the procedure table and generally the abdomen was marked with a surgical marker in an oval, demarcating the region for fat harvest. In patients with low body fat or limited abdominal adipose, the lower lateral lower spine (i.e., “love handle”) area or posterolateral thigh was targeted. 500 cc of tumescent was prepared by combining 50 cc 1% Lidocaine with 1 cc of 1:1000 Epinephrine and sterile saline. After disinfecting the skin with ChloraPrep and bordering the area with sterile drapes, the tumescent was injected using an 18-gauge needle for local anesthesia. Next, a 17-gauge blunt cannula was inserted at the expanded entry point, irrigating the harvest site subcutaneously below Scarpa’s fascia with 60–120-cc tumescent. The Lipogems® kit was then assembled and connected to a bag of 1000 cc of sterile saline. The assembly is prefilled with saline solution and flushed by gravity into the waste bag to obtain a closed system free of air. After ten to 15 minutes, a 13-gauge blunt end cannula was then used to aspirate adipose tissue. The lipoaspirate was then injected into the device passing through a reduction filter, later allowing for draining of blood and oil residue into the waste bag. The central device containing stainless steel ball bearings is shaken for 30 seconds to further fragment and wash the lipoaspirate. When complete, the resulting MFAT is drawn into a syringe for injection.
The meniscal tear(s) was identified using a high-frequency linear ultrasound probe (Sonosite X-Porte; Fujifilm Sonosite, Bothell, WA, USA) in coordination with historical MR images. If a large effusion was detected, this was aspirated prior to MFAT injection. Utilizing sterile technique, MFAT was injected under direct ultrasound guidance into the hypoechoic defects using primarily an 18-gauge 3-inch needle attached to a 3-mL syringe within the visualized meniscal tears and knee joint. We used a 22 gauge 1.5-inch needle when needed due to joint space narrowing. A trephination technique was used to direct the needle into the meniscus from an outer to inner approach as described by Baria et al. . This allowed for lipofilling of the soft tissue defects of the meniscus using 1–2 mL of MFAT into the tear. The remaining available MFAT was then injected into the knee joint using a lateral suprapatellar approach, under ultrasound guidance. Per request, four subjects received a contralateral knee MFAT injection without a confirmed diagnosis of meniscal tear. Outcomes data referred only to the knees originally enrolled in the study.
Post-injection guidelines including weight bearing restrictions—non-weight bearing with crutches for one week, then weight bearing as tolerated for simple daily activities—while refraining from running and jumping activities and repetitive flexion beyond 90 degrees for four weeks total. If there was no significant pain, swelling, or joint line tenderness, and near full range of motion, unrestricted activities were allowed at the six to eight week timeframe. Complications of both the harvest and injection sites were recorded via questionnaire at one and four week follow-ups. Patients were restricted from taking non-steroidal anti-inflammatory medications or steroids for two to three weeks after the procedure, but were allowed two to three days of either tramadol or oxycodone for post-procedural pain.
Significance was set to p < .05 for all tests, which were conducted using SPSS v.21 (IBM, Inc., Armonk, NY). Linear mixed-effects models were employed to evaluate changes in KOOS subscale and NPS scores at each time point. Outcome variables (KOOS, NPS scores) were specified at level 1 and individuals were specified at level 2. Time was treated as a fixed effect, while the intercept was treated as a random effect to account for variance in baseline scores. Using these models, changes in outcomes could be examined within individuals over time while accounting for missing data and disparate lengths in time between each point of data collection . Post hoc analyses with Bonferroni corrections were conducted to determine how outcomes differed at each time point compared with baseline.
Twenty individuals were recruited for the study. Average age and BMI were 59.8 ± 6.5 and 28.6 ± 4.8, respectively. Eleven participants were male. One male subject injured his contralateral, untreated knee following the procedure requiring surgical intervention and thus was excluded from the study. Of the remaining 19 subjects, three underwent injections into meniscal tears bilaterally. Demographic and clinical data are summarized in Table 1. Notably, tears were most commonly found in the medial compartment (82.6%). Complex tears were most common with a prevalence of 73.9%. Only two patients were documented as not having evidence of osteoarthritis on MRI, with most of the cases being graded as mild to moderate in severity.
There were no reported serious adverse events reported during or following the study. One patient reported local erythema and swelling at the harvest site without constitutional symptoms. The decision was made to treat as an uncomplicated cellulitis with amoxicillin/clavulanate 875–125 mg twice daily for ten days with complete resolution of symptoms. Minor complications included soreness at the harvest site in ten of the subjects (52.5%), and reports of “haematoma” formation in three patients (Table 2). Three patients complained of swelling in the injected knee after the procedure though was self-limited. All reported minor complications resolved within four weeks following treatment with the vast majority without complaints/limitations after one week following treatment.
Nineteen subjects completed the 12-month assessment. Three were unavailable for the three month assessment, and four did not complete the six month assessment. Statistically significant improvements in all KOOS subscale and NPS scores were noted at all time points with respect to baseline (p < .01; Table 3). No other significant differences were observed (p > .05). Temporal changes are presented graphically in Figs. 1 and 2.
Despite a growing body of evidence to recommend against APM in the setting of degenerative changes in the knee , many patients continue to opt for surgery due to a perceived lack of available treatment options. And after the eventually perceived failure of conservative management and progression of osteoarthritis, patients elect for total knee arthroplasty at higher rates and younger ages . As meniscus tear management shifts to preservation and repair, it is clear that regenerative treatments will play a role in counteracting the menisci’s poor intrinsic ability to heal, especially in the setting of knee osteoarthritis. The present pilot study demonstrates that MFAT represents a safe and potentially efficacious treatment option for degenerative meniscus tears and may be used to help guide further studies.
A variety of regenerative medicine treatments have been explored as options to treat both meniscal tears and knee osteoarthritis such as platelet-rich plasma, bone marrow aspirate concentrate (BMAC), and adipose-derived mesenchymal stem cells. MFAT was chosen for this study due to distinctive advantages over BMAC and stromal vascular fraction (SVF) in ease of obtaining stem cells from a patient without the need for multiple visits, enzymatic digestion, or cell expansion . Recent research comparing MFAT with SVF demonstrated enhanced growth factor secretion in MFAT which is attributed to an intact perivascular niche . Additionally, MFAT made through mechanical processing and washing of adipose tissue qualifies as “minimal manipulation” under the Food and Drug Administration (FDA) guidelines in the USA unlike enzymatic processing used in SVF . The utilization of enzymes to assist in adipose cell separation requires an FDA-approved Biologic License Application  partially limiting clinical applicability.
One important aspect of our study is the use of direct ultrasound visualization and lipofilling of meniscal defects rather than only performing an intra-articular injection. There is a considerable amount of literature regarding the use of adipose grafting in the fields of reconstructive or cosmetic surgery for the filling and supporting of tissue defects [25,26,27] in addition to its innate regenerative capacity. We utilized a technique for performing intra-meniscal injections under ultrasound guidance, which was described and validated by Baria et al. , in an attempt to accurately place MFAT within meniscal tears and hopefully maximize the treatment effect.
An alternative orthobiologic treatment for meniscus tears and osteoarthritis is injection of platelet-rich plasma (PRP). The basis of this treatment is the autologous source of platelets which release multiple products with important roles in healing, including cytokines, chemokines, and more than 1500 growth factors [28,29,30]. In vitro studies indicate that exposure to anabolic cytokines, such as PDGF-AB which is released from PRP, enables fibrochondrocytes within the avascular region of the meniscus to proliferate and form new matrix . Clinical trials also support the benefit of PRP in meniscal and osteoarthritic indications, though the benefits seen are often minimal [32, 33]. Similarly, a double-blind RCT was conducted to compare outcomes of meniscus trephination with or without PRP injection; failure (defined as meniscus non-union observed in the magnetic resonance arthrography or arthroscopy) was noted for 70% of patients in the control group, while only 48% failure was noted in the PRP group. There was also greater symptom improvement and less eventual APM in the PRP group . The minimal benefits generally observed in the use of PRP to treat osteoarthritis and meniscus tears discouraged its use in this study.
As a group, the study sample showed clinically meaningful improvement in pain, function, and QOL measures despite having previously failed other treatments for their knee pain. These results were similar to two published case reports where individuals with history of knee pain following meniscus tear in the setting of degenerative osteoarthritis were treated with ultrasound-guided intra-meniscal MFAT injections [12, 35]. All subjects avoided the need for APM for their knee pain during the study period. This may be compared with the cross-over rates from conservative management to APM in the Katz study as high as 21–30% at six to 14 months in various randomized controlled trials . Furthermore, no participants reported serious adverse events after the procedure, which is consistent with other studies evaluating the effects of intra-articular MFAT [12, 35].
While the results are encouraging, this study does have several important limitations. This study was designed as a prospective cohort pilot study and no control group was utilized; thus, no definitive conclusions can be drawn regarding efficacy. As a result of this limitation, it is not known whether the treatment effect was caused by injection into the meniscus or into the intra-articular space, or a combination of both. As well, percutaneous trephination of the meniscus with normal saline and PRP has shown some treatment effect for horizontal tears  and thus may have contributed to the treatment effect observed in the present study. To mediate this limitation in a future study, a control group of individuals who solely receive intra-articular injections without injection into the meniscus and another which receives trephination of the meniscus with normal saline could be included. This study also lacked strict classification of the meniscus tears, and in future studies, a verifiable classification system should be used. Inclusion of more quantitative measures of tissue healing should also be considered. One example is measuring meniscus volume using quantitative MRI , which has been utilized in the past to demonstrate cartilage and meniscal growth following a bone marrow–derived aspirate injection . Including these objective measures would yield a better understanding of the physiological effect of MFAT on meniscal healing. It should be noted that the majority of arthroscopic meniscus surgery research does not include any post-operative imaging such as MRI. Another quantitative measure that could be utilized is analgesic drug consumption in the months following the procedure (not the immediate post-operative period); as patients often use these types of drugs to relieve pain, a reduction in the use of pain-killers can be a tool to evaluate the efficacy of the treatment.
Additionally, the sample size was too small for subgroup analyses. Considering the potential impact of age and gender on meniscus tears and healing, the inclusion of these analyses could yield important clinical information. Participants were not blinded to the treatment, risking treatment bias. The placebo effect of having a knee injection has been well studied in the setting of osteoarthritis  and may have contributed to the outcomes. Due to the nature of the procedure (i.e., fat harvest), it is difficult to blind participants to treatment aside from conducting a sham study, which raises ethical concerns. Ameliorating these potential sources of bias would likely yield a strong study to determine efficacy. To better determine the effectiveness of this treatment modality specifically for meniscus tears, a randomized, controlled study on meniscus tears in 20–40-year-old subjects has been initiated Clinical trial # NCT04274543. Furthermore, three of the subjects received bilateral knee MFAT injections which mutually influenced change in KOOS which cannot be only attributed to the index knee.
This study demonstrated that MFAT injected directly into meniscal tears following trephination of the tear along with a joint injection under direct ultrasound guidance represents a safe and clinically significant treatment option for patients with degenerative meniscus tears and knee osteoarthritis (Fig. 3). Additionally, the study suggests that improvement in knee pain and function scores may be sustained for up to one year. This information can help guide the development of a larger, randomized, controlled trial to determine the efficacy of MFAT. Inclusion of pre- and post-surgical MRI and other quantitative outcomes should be considered, as well as the recruitment of a large and diverse sample, to better understand physiological treatment effects.
Fox AJS, Wanivenhaus F, Burge AJ, Warren RF, Rodeo SA (2015) The human meniscus: a review of anatomy, function, injury, and advances in treatment. Clin Anat N Y N 28:269–287. https://doi.org/10.1002/ca.22456
Miller R, Azar F (2017) Knee injuries. In: Campbell’s operative orthopaedics, 13th edn, Philadelphia, pp 2121–2297
Badlani JT, Borrero C, Golla S, Harner CD, Irrgang JJ (2013) The effects of meniscus injury on the development of knee osteoarthritis: data from the osteoarthritis initiative. Am J Sports Med 41:1238–1244. https://doi.org/10.1177/0363546513490276
Tsujii A, Amano H, Tanaka Y, Kita K, Uchida R, Shiozaki Y, Horibe S (2018) Second look arthroscopic evaluation of repaired radial/oblique tears of the midbody of the lateral meniscus in stable knees. J Orthop Sci 23:122–126. https://doi.org/10.1016/j.jos.2017.09.023
Siemieniuk RAC, Harris IA, Agoritsas T, Poolman RW, Brignardello-Petersen R, Van de Velde S, Buchbinder R, Englund M, Lytvyn L, Quinlan C, Helsingen L, Knutsen G, Olsen NR, Macdonald H, Hailey L, Wilson HM, Lydiatt A, Kristiansen A (2017) Arthroscopic surgery for degenerative knee arthritis and meniscal tears: a clinical practice guideline. BMJ 357:j1982. https://doi.org/10.1136/bmj.j1982
Caplan AI, Dennis JE (2006) Mesenchymal stem cells as trophic mediators. J Cell Biochem 98:1076–1084. https://doi.org/10.1002/jcb.20886
Pak J, Lee JH, Lee SH (2014) Regenerative repair of damaged meniscus with autologous adipose tissue-derived stem cells. BioMed Res Int 2014(436029). https://doi.org/10.1155/2014/436029
Pak J, Lee JH, Park KS, Jeon JH, Lee SH (2017) Potential use of mesenchymal stem cells in human meniscal repair: current insights. Open Access J Sports Med 8:33–38. https://doi.org/10.2147/OAJSM.S113018
Coleman SR (2006) Structural fat grafting: more than a permanent filler. Plast Reconstr Surg 118:108S–120S. https://doi.org/10.1097/01.prs.0000234610.81672.e7
Tremolada C, Colombo V, Ventura C (2016) Adipose tissue and mesenchymal stem cells: state of the art and Lipogems® Technology development. Curr Stem Cell Rep 2:304–312. https://doi.org/10.1007/s40778-016-0053-5
Bianchi F, Maioli M, Leonardi E, Olivi E, Pasquinelli G, Valente S, Mendez AJ, Ricordi C, Raffaini M, Tremolada C, Ventura C (2013) A new nonenzymatic method and device to obtain a fat tissue derivative highly enriched in pericyte-like elements by mild mechanical forces from human lipoaspirates. Cell Transplant 22:2063–2077. https://doi.org/10.3727/096368912X657855
Striano RD, Battista V, Bilboo N (2017) Non-responding knee pain with osteoarthritis, meniscus and ligament tears treated with ultrasound guided autologous, micro-fragmented and minimally manipulated adipose tissue. Open J Regen Med 6:17–26. https://doi.org/10.4236/ojrm.2017.62002
Ferreira-Valente MA, Pais-Ribeiro JL, Jensen MP (2011) Validity of four pain intensity rating scales. Pain 152:2399–2404. https://doi.org/10.1016/j.pain.2011.07.005
Tubach F, Ravaud P, Baron G, Falissard B, Logeart I, Bellamy N, Bombardier C, Felson D, Hochberg M, van der Heijde D, Dougados M (2005) Evaluation of clinically relevant changes in patient reported outcomes in knee and hip osteoarthritis: the minimal clinically important improvement. Ann Rheum Dis 64:29–33 . https://doi.org/10.1136/ard.2004.022905
Collins NJ, Misra D, Felson DT, Crossley KM, Roos EM (2011) Measures of knee function: International Knee Documentation Committee (IKDC) Subjective Knee Evaluation Form, Knee Injury and Osteoarthritis Outcome Score (KOOS), Knee Injury and Osteoarthritis Outcome Score Physical Function Short Form (KOOS-PS), Knee Outcome Survey Activities of Daily Living Scale (KOS-ADL), Lysholm Knee Scoring Scale, Oxford Knee Score (OKS), Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), Activity Rating Scale (ARS), and Tegner Activity Score (TAS). Arthritis Care Res 63(Suppl 11):S208–S228. https://doi.org/10.1002/acr.20632
Alviar MJ, Olver J, Brand C, Hale T, Khan F (2011) Do patient-reported outcome measures used in assessing outcomes in rehabilitation after hip and knee arthroplasty capture issues relevant to patients? Results of a systematic review and ICF linking process. J Rehabil Med 43:374–381. https://doi.org/10.2340/16501977-0801
Roos EM, Lohmander LS (2003) The knee injury and osteoarthritis outcome score (KOOS): from joint injury to osteoarthritis. Health Qual Life Outcomes 1:64. https://doi.org/10.1186/1477-7525-1-64
Baria MR, Sellon JL, Lueders D, Smith J (2017) Sonographically guided knee meniscus injections: feasibility, techniques, and validation. PM&R 9:998–1005. https://doi.org/10.1016/j.pmrj.2016.12.012
Lindstrom ML, Bates DM (1990) Nonlinear mixed effects models for repeated measures data. Biometrics 46:673–687
Kurtz S, Ong K, Lau E, Mowat F, Halpern M (2007) Projections of primary and revision hip and knee arthroplasty in the United States from 2005 to 2030. J Bone Joint Surg Am 89:780–785. https://doi.org/10.2106/JBJS.F.00222
Oberbauer E, Steffenhagen C, Wurzer C, Gabriel C, Redl H, Wolbank S (2015) Enzymatic and non-enzymatic isolation systems for adipose tissue-derived cells: current state of the art. Cell Regen Lond Engl:4:7. https://doi.org/10.1186/s13619-015-0020-0
Vezzani B, Shaw I, Lesme H, Yong L, Khan N, Tremolada C, Péault B (2018) Higher pericyte content and secretory activity of microfragmented human adipose tissue compared to enzymatically derived stromal vascular fraction. Stem Cells Transl Med 7:876–886. https://doi.org/10.1002/sctm.18-0051
Lysaght T, Campbell AV (2011) Regulating autologous adult stem cells: the FDA steps up. Cell Stem Cell 9:393–396. https://doi.org/10.1016/j.stem.2011.09.013
Schroeder A, Rubin JP, Kokai L, Sowa G, Chen J, Onishi K Use of adipose-derived orthobiologics for musculoskeletal injuries: a narrative review. PM&R n/a. https://doi.org/10.1002/pmrj.12291
De Decker M, De Schrijver L, Thiessen F, Tondu T, Van Goethem M, Tjalma WA (2016) Breast cancer and fat grafting: efficacy, safety and complications-a systematic review. Eur J Obstet Gynecol Reprod Biol 207:100–108. https://doi.org/10.1016/j.ejogrb.2016.10.032
Barret JP, Sarobe N, Grande N, Vila D, Palacin JM (2009) Maximizing results for lipofilling in facial reconstruction. Clin Plast Surg 36:487–492. https://doi.org/10.1016/j.cps.2009.02.005
Strong AL, Cederna PS, Rubin JP, Coleman SR, Levi B (2015) The current state of fat grafting: a review of harvesting, processing, and injection techniques. Plast Reconstr Surg 136:897–912. https://doi.org/10.1097/PRS.0000000000001590
Metcalf KB, Mandelbaum BR, McIlwraith CW (2013) Application of platelet-rich plasma to disorders of the knee joint. Cartilage 4:295–312. https://doi.org/10.1177/1947603513487553
Wei L-C, Gao S-G, Xu M, Jiang W, Tian J, Lei G-H (2012) A novel hypothesis: the application of platelet-rich plasma can promote the clinical healing of white-white meniscal tears. Med Sci Monit Int Med J Exp Clin Res 18:HY47-50. https://doi.org/10.12659/msm.883254
Ruiz Ibán MÁ, Comellas Melero N, Martinez-Botas J, Ortiz A, Diaz Heredia J (2014) Growth factor expression after lesion creation in the avascular zone of the meniscus: a quantitative PCR study in rabbits. Arthrosc J Arthrosc Relat Surg 30:1131–1138. https://doi.org/10.1016/j.arthro.2014.04.089
Tumia NS, Johnstone AJ (2009) Platelet derived growth factor-AB enhances knee meniscal cell activity in vitro. Knee 16:73–76. https://doi.org/10.1016/j.knee.2008.08.008
Guenoun D, Magalon J, de Torquemada I, Vandeville C, Sabatier F, Champsaur P, Jacquet C, Ollivier M (2020) Treatment of degenerative meniscal tear with intrameniscal injection of platelets rich plasma. Diagn Interv Imaging 101:169–176. https://doi.org/10.1016/j.diii.2019.10.003
Blanke F, Vavken P, Haenle M, von Wehren L, Pagenstert G, Majewski M (2015) Percutaneous injections of Platelet rich plasma for treatment of intrasubstance meniscal lesions. Muscles Ligaments Tendons J 5:162–166. https://doi.org/10.11138/mltj/2015.5.3.162
Kaminski R, Maksymowicz-Wleklik M, Kulinski K, Kozar-Kaminska K, Dabrowska-Thing A, Pomianowski S (2019) Short-term outcomes of percutaneous trephination with a platelet rich plasma intrameniscal injection for the repair of degenerative meniscal lesions. A prospective, randomized, double-blind, parallel-group, placebo-controlled study. Int J Mol Sci 20. https://doi.org/10.3390/ijms20040856
Striano RD, Chen H, Bilbool N, Azatullah K, Hilado J, Horan K Non-responsive knee pain with osteoarthritis and concurrent meniscal disease treated with autologous micro-fragmented adipose tissue under continuous ultrasound guidance. 7
Katz JN, Brophy RH, Chaisson CE, de Chaves L, Cole BJ, Dahm DL, Donnell-Fink LA, Guermazi A, Haas AK, Jones MH, Levy BA, Mandl LA, Martin SD, Marx RG, Miniaci A, Matava MJ, Palmisano J, Reinke EK, Richardson BE, Rome BN, Safran-Norton CE, Skoniecki DJ, Solomon DH, Smith MV, Spindler KP, Stuart MJ, Wright J, Wright RW, Losina E (2013) Surgery versus physical therapy for a meniscal tear and osteoarthritis. N Engl J Med 368:1675–1684. https://doi.org/10.1056/NEJMoa1301408
Bowers ME, Tung GA, Fleming BC, Crisco JJ, Rey J (2007) Quantification of meniscal volume by segmentation of 3T magnetic resonance images. J Biomech 40:2811–2815. https://doi.org/10.1016/j.jbiomech.2007.01.016
Vangsness CT, Farr J, Boyd J, Dellaero DT, Mills CR, LeRoux-Williams M (2014) Adult human mesenchymal stem cells delivered via intra-articular injection to the knee following partial medial meniscectomy: a randomized, double-blind, controlled study. J Bone Joint Surg Am 96:90–98. https://doi.org/10.2106/JBJS.M.00058
Saltzman BM, Leroux T, Meyer MA, Basques BA, Chahal J, Bach BR, Yanke AB, Cole BJ (2017) The therapeutic effect of intra-articular normal saline injections for knee osteoarthritis: a meta-analysis of evidence level 1 studies. Am J Sports Med 45:2647–2653. https://doi.org/10.1177/0363546516680607
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
About this article
Cite this article
Malanga, G.A., Chirichella, P.S., Hogaboom, N.S. et al. Clinical evaluation of micro-fragmented adipose tissue as a treatment option for patients with meniscus tears with osteoarthritis: a prospective pilot study. International Orthopaedics (SICOT) 45, 473–480 (2021). https://doi.org/10.1007/s00264-020-04835-z
- Knee osteoarthritis
- Adipose tissue
- Knee injuries