Clinical bottom line
Wearable neuromuscular electrical stimulation (NMES) devices represent a promising adjunct in postoperative orthopedic rehabilitation, aiming to enhance muscle strength, reduce atrophy, and improve functional recovery. Current evidence suggests that NMES can be beneficial in select patient populations, particularly after total knee replacement and in cases with limited voluntary muscle activation. However, the quality and consistency of clinical data remain variable, and optimal stimulation protocols, timing, and patient selection criteria are not yet fully established. Clinicians should consider NMES as a complementary tool rather than a standalone intervention, integrating it with conventional rehabilitation strategies.
What the evidence shows
Neuromuscular electrical stimulation applies electrical impulses to elicit muscle contractions, potentially counteracting disuse atrophy and facilitating neuromuscular re-education. Its use in orthopedic postoperative care has been explored to improve outcomes such as muscle strength, pain control, and functional mobility.
Siddiqui et al. (2026) investigated the combined effect of muscle energy technique and NMES in patients undergoing total knee replacement. Their findings indicated that NMES contributed to improved quadriceps strength and functional scores compared to standard rehabilitation alone, suggesting a synergistic benefit in postoperative recovery.
Glaviano et al. (date not specified) reported on patterned electrical NMES in individuals with patellofemoral pain, demonstrating improvements in muscle activation patterns and pain reduction. Although this study focused on a nonoperative condition, it supports the concept that NMES can modulate neuromuscular function relevant to orthopedic recovery.
More broadly, reviews by Takeda et al. (2017) and Gerovasili et al. (2014) highlight the utility of NMES devices in rehabilitation settings, including stroke and intensive care unit patients, emphasizing their role in preventing muscle atrophy and improving functional outcomes. While these populations differ from orthopedic patients, the underlying physiological rationale for NMES is shared.
Yang et al. (2024) introduced electrocardiogram-synchronized NMES, a novel approach potentially enhancing stimulation timing and efficacy. Although this technology is in early stages, it may offer future improvements in wearable NMES device performance.
Alon et al. (2024) and Maddocks et al. (2020) provide comprehensive overviews of electrical stimulation techniques, underscoring the importance of individualized protocols and patient tolerance in achieving optimal rehabilitation results.
Caveats and uncertainty
Despite encouraging findings, several limitations temper enthusiasm for widespread NMES adoption in orthopedic postoperative care. The heterogeneity of study designs, stimulation parameters, patient populations, and outcome measures complicates direct comparisons and meta-analyses.
Most clinical trials have relatively small sample sizes and short follow-up durations, limiting the ability to assess long-term functional benefits and durability of NMES effects. Additionally, patient adherence to wearable NMES regimens can be variable, influenced by device comfort, ease of use, and perceived benefit.
There is also uncertainty regarding the optimal timing of NMES initiation post-surgery, stimulation intensity, frequency, and duration. Overstimulation risks fatigue or discomfort, whereas insufficient dosing may yield minimal clinical impact.
Furthermore, while NMES may improve muscle strength, its effect on broader functional outcomes such as gait, balance, and return to activity remains less well characterized in orthopedic populations.
How this may change practice
Wearable NMES devices could become a valuable adjunct in postoperative orthopedic rehabilitation protocols, especially for patients with significant muscle weakness or those unable to engage fully in active exercise early after surgery. Integration of NMES may accelerate muscle reconditioning, reduce hospital length of stay, and improve patient-reported outcomes.
Clinicians should consider patient-specific factors such as baseline muscle function, pain levels, and motivation when prescribing NMES. Education on device use and monitoring for adverse effects are essential to maximize adherence and safety.
Future incorporation of advanced technologies like ECG-synchronized NMES may enhance stimulation precision and patient comfort, potentially improving efficacy.
Ultimately, NMES should complement rather than replace established rehabilitation modalities, with multidisciplinary coordination to tailor individualized recovery plans.