Abstract
Purpose
Despite numerous well-conducted studies and meta-analyses, the management of the patella during total knee arthroplasty (TKA) remains controversial. The aim of our study was to compare the clinical and radiological outcomes between patients with and without patellar resurfacing and to determine the influence of resurfacing on patellar tracking with a “patella-friendly” prosthesis.
Methods
A single-centered prospective randomized controlled study was performed between April 2017 and November 2018. Two hundred and forty-five consecutive patients (250 knees) scheduled for TKA were randomized for patellar resurfacing or patella non-resurfacing. All patients received the same total knee prosthesis and were evaluated clinically and radiologically, including the International Knee Society Score (KSS knee and function), Forgotten Joint Score (FJS), anterior knee pain (AKP), pain when climbing stairs, patellar tilt, and patellar translation.
Results
Two hundred and twenty-nine knees were available for clinical evaluation and 221 knees for radiographic analysis. The revision rate for patellofemoral cause was 3.1% (7 cases) with no difference between the groups (p = 0.217). There was no difference in survival rate between patellar resurfacing (88.3%) and non-resurfacing (85.3%) after 24 months (p = 0.599). There were no differences in KSS functional component (p = 0.599), KSS knee component (p = 0.396), FJS (p = 0.798), and AKP (p = 0.688) at a mean follow-up of 18 months. There was twice as much stair pain for the non-resurfacing group (17.1% versus 8.5%) (p = 0.043). There was patellar tilt in 43% of resurfaced knees (n = 50/116) versus 29% in non-resurfaced knees (n = 30/105) (p = 0.025); however, there was more patellar translation in the non-resurfaced group (21.0% versus 7.8%) (p < 0.001). There were no specific complications attributed to the patellar resurfacing procedure. There were four secondary patellar resurfacing procedures (3.6%) in the non-resurfaced group after a mean of 10 ± 7 months (1–17) postoperatively.
Conclusion
There is no superiority of patellar resurfacing or non-resurfacing in terms of clinical or radiological outcomes at mid-term. Secondary patellar resurfacing is rare. There is not enough evidence to recommend systematic patellar resurfacing with a “patella-friendly” prosthesis.
Level of evidence
1.
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Abbreviations
- BMI:
-
Body mass index
- FJS:
-
Forgotten joint score
- FT:
-
Femorotibial
- HKA:
-
Hip knee ankle
- KSS:
-
Knee society score
- PR:
-
Patellar resurfacing
- PNR:
-
Patellar non-resurfacing
- OA:
-
Osteoarthritis
- PE:
-
Polyethylene
- PF:
-
Patellofemoral
- RR:
-
Relative risk
- TKA:
-
Total knee arthroplasty
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Acknowledgment
The present work would not have been possible without the supervision of P. Neyret (MD, PhD), who initiated the investigation. The authors specially thank Y. Herry for his personal investment in the study protocol writing.
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ED: data collection, statistical analysis and article writing. CB, JS, ESM, PN, ES: re-editing, interpretation of data. SL: study design and final approval of the version to be published.
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This study was approved by the Clinical Research and Innovation Office on December 23, 2016 under number 2016-A01697-44. All patients signed a consent form that included a description of the protocol and the potential complications of both procedures.
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Deroche, E., Batailler, C., Swan, J. et al. No difference between resurfaced and non-resurfaced patellae with a modern prosthesis design: a prospective randomized study of 250 total knee arthroplasties. Knee Surg Sports Traumatol Arthrosc 30, 1025–1038 (2022). https://doi.org/10.1007/s00167-021-06521-y
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DOI: https://doi.org/10.1007/s00167-021-06521-y