Purpose of Review
Functional recovery from total hip replacement can be suboptimal and deficits in quadriceps muscle strength may hinder the return to activities of daily living. Neuromuscular electrical stimulation (NMES) devices have long been used to preserve and restore skeletal muscle mass and function following periods of muscle atrophy due to immobilisation. Here, we evaluate the potential role of NMES for strengthening the quadriceps muscles following hip replacement.
Two studies have investigated the effects of NMES on quadriceps strength following hip replacement. NMES in addition to exercise training is reported to reduce length of stay and improve gait speed, stair climbing performance and sit-to-stand scores in one study. Conversely, the other study reports no significant effect of NMES on length of stay or gait speed, but instead, benefits to knee extensor strength of the operated side, functional status and independence. The benefits of NMES for the treatment of atrophic musculature following knee replacement are better established.
Although it is not possible to offer best-practice recommendations for clinical rehabilitation, the promising approach of NMES following total hip replacement requires further investigation. When used as an adjunctive treatment to standard care physiotherapy, NMES may facilitate recovery and, when used immediately post-surgery, can enable a high exercise volume, with little effort, at a time point where muscle inhibition and atrophy are most prevalent.
For some time, total hip replacement has been recognised as a clinically successful and cost-effective surgical procedure. The operation has seen significant change over time and the technical development of prostheses and advances in surgical techniques have led to increasingly successful outcomes [1,2,3]. It has been acknowledged, however, that full recovery following surgery does not equate to being discharged early without complications . Recovery is a complex process that is only complete once the patient returns to normal function . This has been promoted more recently in Enhanced Recovery after Surgery programmes, where there is an additional emphasis on enabling a patient to return to work, activities of daily living and pre-surgery function . There is evidence to suggest that physical activity levels do not increase after surgery , and in some cases, patients are less active at 2-year follow-up than before hospital admission [8•]. As return to normal function becomes the benchmark for recovery after major surgery, a focus of perioperative care should now be on post-discharge support and physical rehabilitation strategies [9•].
To improve functional recovery from hip replacement surgery, it is first important to identify which muscle groups are functionally relevant for the motor performance of activities of daily living. Lower extremity muscle mass has been reported as a key determinant of physical performance amongst mobility-limited older adults, and total leg mass and muscle strength are considered strong independent predictors of the level of functional impairment [10, 11]. More specifically, there is evidence to suggest an association between quadriceps femoris strength and functional outcomes , as quadriceps muscle strength is functionally relevant for performance of daily tasks [13, 14]. Both knee extensor concentric and eccentric strength and power are associated with improved performance of the sit-to-stand movement  and muscle activity that produces sufficient force is essential to enable a patient to walk, rise from a chair or climb stairs . In addition, muscle weakness has been associated with slower gait speeds and an increased risk of falls .
Challenges of Functional Recovery
Unfortunately, many of the muscles most important for functional activity correlate with those negatively affected by hip osteoarthritis, the primary indication for a hip replacement  and by substantial strength decreases in the first week following hip replacement surgery. Existing literature suggests that unilateral hip osteoarthritis is characterised by generalised muscle weakness of the affected leg  and hip muscle strength and leg press power are reported to decrease substantially in the first week after surgery . There is a consistent, strong evidence that reports a reduced quadriceps muscle size in the affected leg, compared with the contralateral leg, of an individual with osteoarthritis of the hip , and hip replacement patients are commonly affected by loss of quadriceps function and impairments that may remain for years following discharge . Preoperative osteoarthritic pain can lead to reduced physical activity levels as patients suffer from pain-related immobilisation or reduced functionality , which subsequently leads to muscle disuse atrophy. Muscle weakness may also occur due to a reduction in the level of motor unit activation  and this deficit occurs when there is failure to recruit all available motor units or a reduction in maximal motor unit discharge rate from those motor units which are recruited .
Electrical Stimulation Therapy
As well as activation of muscles via the bodies’ nervous system, muscles can be contracted by the application of an external electrical stimulation. Electrotherapy is the delivery of energy from a device that enters into a tissue and results in a change in one or more physiological events . Neuromuscular electrical stimulation (NMES) involves the application of pre-programmed trains of stimuli to superficial skeletal muscles, by means of surface electrodes placed over the muscle belly, in an attempt to evoke visible, involuntary contractions . NMES devices have long been used to either preserve  or restore  skeletal muscle mass and function following periods of muscle atrophy due to immobilisation. Despite the promising approach to rehabilitation using perioperative NMES, devices are not used in routine clinical practice following joint replacement. NMES can strengthen atrophic musculature weakened from disuse and orthopaedic patients, immobilised due to joint pain or by the fixation of casts and splints, may benefit from this treatment strategy .
Whilst it is thought that the force increases induced by NMES are similar, but not greater than those induced by voluntary training , it can be used in the acute recovery phase following surgery and may offer an adjunctive therapy or alternative treatment strategy for those confined to bed rest or unable to mobilise independently. Following the immediate postoperative phase, NMES combined with exercise interventions has been advocated as an optimal treatment strategy, as the adaptions evoked by NMES are not just confined to the activated muscle but also involve neural adaptions through reflex inputs to the spinal cord and supraspinal centres . There is evidence that demonstrates a better functional recovery, particularly in the immediate phase, following total knee replacement for patients using NMES [31•]; however, research in cohorts of hip replacement patients is limited and more studies are warranted [9•]. Therefore, our review aims to summarise and evaluate the current evidence for stimulating the quadriceps muscles following hip replacement surgery, in order to improve functional recovery.
A literature review was conducted to examine current published evidence that considers the use of NMES for strengthening the quadriceps muscles following hip replacement. A computer-based search was completed in March 2018, and the electronic database sourced included PubMed, Cochrane library, Google Scholar, Science Direct, PsychINFO, CINAHL Complete and Medline Complete. The search reviewed all fields of the available literature, published in the English language (or those where a translation was available) to the earliest record on file. The reference lists of articles, review papers and textbooks were also scanned for additional papers. Studies were considered eligible for inclusion within the synthesis if they met the specified inclusion and exclusion criteria listed in Table 3 in the Appendix. As there are two categories of NMES, functional electrical stimulation search terms were also included to capture studies where the transmission of an electrical impulse over the skin had been used to enhance functional activities in neurologically impaired individuals. Studies which used sensory-level electrical stimulation (namely transcutaneous electrical nerve stimulation) were excluded.
Search Strategy and Study Selection
A search strategy was created to capture all relevant publications which assessed the role of NMES for improving quadriceps weakness following total hip replacement (Table 1). Both inpatient and outpatient rehabilitation routines were included, where NMES was prescribed postoperatively to stimulate the quadriceps muscles. The search strategy generated seven results. All titles and abstracts were initially checked for relevance by two independent reviewers (LB and TW), who both hold professional positions within orthopaedic research. Four papers were omitted as they did not evaluate an NMES intervention following hip replacement surgery, and one study was removed as it investigated peripheral magnetic stimulation. Once irrelevant results were removed, the remaining articles underwent a full-text appraisal to ensure that the studies were of good methodological quality, that their findings were significant, that they were evaluating a NMES device and that they were examining the effectiveness of the device to treat quadriceps weakness or impairment. Study design was assessed using the PICO (Patient, Intervention, Comparison and Outcome) framework  to ensure the study was relevant. A flow diagram of the study identification process can be found in Fig. 1 in the Appendix.
The PEDro (Physiotherapy Evidence Database) scale was used to grade the methodological quality of the two articles discussed within our review . The 11-item scale is a validated measure used to assess randomised controlled trials  and is reported to have good inter-rater reliability (generalised kappa statistic of between 0.40 and 0.75) . Each study was scored out of ten by two independent authors; with a score of 6 as the threshold for a high-quality study (item one on the scale indicates external validity). The PEDro scale scores ten items: random allocation, concealed allocation, similarity at baseline, subject blinding, therapist blinding, assessor binding, greater than 85% follow-up for at least one key outcome, intention-to-treat analysis, between-group statistical comparison for at least one key outcome and point and variability measures for at least one key outcome . Quality assessment was not a factor for inclusion or exclusion within the review but was instead utilised to facilitate interpretation of findings.
Summary of Current Evidence
The search yielded seven results, two of which were relevant for inclusion within this review. A summary of the characteristics of these two studies is presented in Table 2. One study has investigated the effects of unilateral NMES on the operated side following hip replacement compared to standard home-based rehabilitation or unilateral resistance training of the operated side . The patients received 1 h of stimulation a day for 12 weeks to the quadriceps muscles, at a pulse rate of 40 Hz, a pulse width of 250 μs and each stimulation package lasted for 10 s, followed by 20 s of rest. During the first and last 2 s of stimulation, the amplitude increased and decreased gradually respectively. Mean ± standard error length of stay was shorter for the resistance training group (10.0 ± 2.4 days) than the electrical stimulation group (12 ± 2.8 days) and the standard rehabilitation group (16.0 ± 7.2 days) (p < .05). Resistance training included daily knee extension exercises (3 × 10 repetitions) in the seated position with sandbags strapped to the ankle during hospitalisation. As soon as possible, training was performed on adjustable leg press and knee-extension machines. The protocol included a 10-min warm-up on a stationary bike, seated knee extensions and leg presses performed in the supine position. Training intensity was progressively increased in intensity from 20-repetition maximum (RM) (∼ 50% of 1 RM) the first week to 15 RM (∼ 65% of 1 RM) during weeks two to four to 12 RM (∼ 70% of 1 RM) during weeks five to six and finally to 8 RM (∼ 80% of 1 RM) the last 6 weeks.
Resistance training increased maximal gait speed by 30% (p < .001), stair climbing performance by 28% (p < .005) and sit-to-stand score by 30% (p < .001). Electrical stimulation increased maximal gait speed by 19% (p < .05), stair climbing performance by 21% (p < .001) and sit-to-stand score by 21% (p < .001). No improvements were seen in the group receiving standard, home-based rehabilitation. Quadriceps muscle cross-sectional area of the operated leg decreased by 13% at 5 weeks post-surgery in the standard care group (p < .05) and remained 9% below baseline values at 12 weeks following surgery (p < .05). In the resistance training group, cross-sectional area of the operated leg was unaltered at 5 weeks post-surgery and increased by 12% from baseline values to 12 weeks following surgery (p < .05). In the electrical stimulation group, cross-sectional area of the operated side decreased by 4% at 5 weeks following surgery (p < .05) and increased by 7% from 5 weeks to 12 weeks following surgery (p < .05). The non-operated side was unaffected in all three groups. Peak torque improved on the operated leg for the resistance training group by 28% at 60°/s (p < .001) and 22% at 180°/s (p < .05) at 12 weeks following surgery, but there were no changes on either leg at any time for the electrical stimulation and standard care groups .
Electrical stimulation in addition to physiotherapy has been compared to standard care physiotherapy alone following hip replacement surgery in one study . Stimulation was applied to the quadriceps and calf muscles bilaterally using two portable dual-channel stimulators. Each delivered a 10-Hz biphasic current, with a pulse width of 200 μs and each cycle was on and off alternatively for 20 s. As the rehabilitation intervention progressed, the stimulation intensity applied to each muscle was increased to the maximum value tolerated by the patients. The stimulation occurred for a 1-h session, 5 days a week for 5 weeks in addition to 2 h of physiotherapy. Low-frequency electrical muscle stimulation of the quadriceps, in addition to conventional physiotherapy, in elderly subjects (mean age 78 years) was well tolerated and led to a significant increase in muscle strength in the operated limb. There was a significant increase in maximal isometric strength of the knee extensors on the operated (77% increase (p < .01)) and non-operated (15% increase (p < .05)) sides in the electrical stimulation group, and in the operated limb of the control group (23% increase (p < .05). The improvement in strength was significantly greater for the electrical stimulation group than the control group for the operated limb (p < .05) and was also greater for the non-operated leg (15% vs 8%) but did not reach statistical significance. The electrical stimulation group demonstrated significant improvements from pre-surgery to post-surgery in functional status and degree of independence (as measured by the FIM instrument) 45 days after the intervention was initiated (21.8% increase) but the control group did not (16% increase) (p < .05). Although there were no significant differences in walking speed or length of stay between the electrical stimulation and control groups, the stimulation was advocated as a safe and effective adjunct therapy to standard care for hip replacement patients.
Regaining muscle strength is important for postoperative function following total hip replacement  and as hip muscle strength and leg press power decrease substantially in the first week after surgery ; early rehabilitation is of significant importance. Early mobilisation, also termed early ambulation, is a well-documented component of enhanced recovery programmes that can prevent early postoperative complications such as venous thromboembolism  and respiratory infection . Despite the well-established benefits of early mobilisation post-surgery, the role of the physiotherapist post-discharge is not fully understood and there is currently no agreed evidence-base for exercise-based physical rehabilitation to enhance postoperative recovery from total hip replacement surgery . As advances in technology improve the standard and availability of assistive devices to support rehabilitation, it is possible that NMES may have a role in postoperative rehabilitation. It is acknowledged that NMES is not superior to traditional exercise for restoring muscular strength; however, it can be applied in the early phase of rehabilitation when voluntary contractions are not feasible and may enable high exercise volume, with little effort, at a time point where muscle inhibition is most prevalent [9•].
Due to the limited available studies, the small sample sizes and the differences in protocol design and patient demographics, it is not possible to offer best practice recommendations for clinical rehabilitation. NMES is reported to improve length of stay, gait speed, stair climbing performance, sit-to-stand scores and reduction of quadriceps muscles cross-sectional area in one study . Similar results were seen with resistance training, but not with standard home-based rehabilitation . Conversely, Gremeaux et al.  report no significant effect of NMES on length of stay or gait speed, but instead benefits to knee extensor strength of the operated side, functional status and independence. However, the participants are not necessarily comparable between these studies due to differences in protocol design and patient demographics, such as age. Both studies highlight the benefits of utilising NMES as an adjunct treatment to standard physiotherapy, although Suetta et al.  advocate postoperative resistance training to have a greater effect. Due to the small number of participants, conclusions must be drawn with caution.
The methodological qualities of the two studies were graded as “high quality” in accordance with the PEDro scale (Table 4 in the Appendix) . Both studies were deducted points due to failure to blind subjects; however, it is acknowledged that blinding in trials using electrical stimulation is not always feasible . The study by Gremeaux et al.  was deduced a further two points as it was not clear whether the therapists or outcome assessors were blinded. The study conducted by Suetta et al.  was deducted a point for item 8 (measures of at least one key outcome obtained from more than 85% of the subjects initially allocated to groups) as only 30 of the 36 (83%) originally enrolled completed the study. Reasons for withdrawal were illness (2), personal problems (2) and dissatisfaction with the randomisation outcome (2). Both studies report limitations due to small sample sizes, and in addition, Gremeaux et al.  acknowledge their inability to standardise the exercise intensity of their rehabilitation programme, limitations to their walk tests and the absence of a true placebo group.
Neuromuscular Electrical Stimulation in Knee Replacement Surgery
Despite the paucity of evidence for electrical stimulation in patients undergoing hip replacement, rehabilitation programmes that combine high-intensity muscle contractions in addition to NMES treatment to facilitate activation are reported to attenuate the loss of quadriceps strength following total knee replacement [31, 40]. Electrical stimulation is reported to provide a sufficient training dose for patients lacking adequate volitional quadriceps activation by engaging neurophysiological mechanisms which facilitate strength gains and create a physical stress to the quadriceps’ neuromuscular system . Major muscles functioning around the hip and knee are reported to show a substantial loss of strength and mass in both patients with osteoarthritis of the hip  and of the knee . Similarly, early postoperative strength losses and decreased functional capacity remain both post-knee replacement  and post-hip replacement  and deficits in quadriceps muscle strength have been highlighted following both procedures [21, 45]. As similarities exist in atrophic musculature following hip and knee replacement surgery, these findings are important to help inform future research.
Although it is not possible to offer best practice recommendations for clinical rehabilitation, the promising approach of NMES following total hip replacement requires further investigation. Combining electrical stimulation with standard physiotherapy care may help to attenuate the reductions in quadriceps strength, muscle fibre cross-sectional area and voluntary muscle activation which occur following surgery. NMES in addition to physiotherapy is advocated following total knee replacement for improving strength and function by combining low repetitions with rest periods to prevent muscle fatigue , however, further evidence is needed in cohorts of hip replacement patients. NMES may be particularly beneficial in the early acute stage of recovery, as use immediately post-surgery can enable a high exercise volume, with little effort, at a time point where muscle inhibition is most prevalent [9•]. Appropriate stimulation parameters are of paramount importance and should be a focus of future research.
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Conflict of Interest
Thomas Wainwright reports personal non-related consultancy fees from Zimmer Biomet, Sky Medical Technology, The Technology Partnership, DePuy and Medtronic. He is a Director and Shareholder in Healthdecoded Ltd. He has received institutional research grants from Dorset Local Enterprise Partnership, Wessex Academic Health Science Network, OSSIM Technologies, Stryker and The Technology Partnership outside the submitted work. Ian Swain and Paul Taylor report patents on various Functional Electrical Stimulators and are shareholders in a stimulator manufacturing company, Odstock Medical Limited. None of these devices were used in any of the work described here. Louise Burgess declares no conflicts of interest relevant to this manuscript.
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Burgess, L.C., Swain, I.D., Taylor, P. et al. Strengthening Quadriceps Muscles with Neuromuscular Electrical Stimulation Following Total Hip Replacement: a Review. Curr Phys Med Rehabil Rep 7, 275–283 (2019). https://doi.org/10.1007/s40141-019-00225-8
- Neuromuscular electrical stimulation (NMES)
- Total hip replacement
- Functional recovery