This week in Physical Medicine & Rehabilitation

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This week: laser therapy for carpal tunnel pain under fresh meta-analysis, nerve stimulation for spasticity and bladder function after spinal cord injury, and what keeps people with paraplegia from managing their own bowel care.

Welcome to This Week in Physical Medicine & Rehabilitation. We're covering 10 papers this week: 3 in depth, 4 in brief, 3 quick signals.

The American Journal of Physical Medicine and Rehabilitation published an updated systematic review and meta-analysis from Liu and colleagues on low-level laser therapy for carpal tunnel syndrome [1]. The team searched six databases and pooled sixteen randomized controlled trials. Pain was the primary outcome, and laser therapy produced a large, statistically significant reduction in pain. Grip strength improved by a smaller but still significant margin. Sensory nerve conduction velocity also improved, with the benefit concentrated in trials that added laser to active conservative treatment or delivered it in pulsed mode. Median nerve cross-sectional area did not shrink significantly overall, and reached significance only in the subgroup combined with active conservative treatment. Pulsed mode looked better for pain relief, while continuous mode looked better for grip strength, and meta-regression flagged session number and wavelength as moderators for some outcomes. The main limitation is that these parameter findings come from subgroup and regression analyses across different trials, so they generate hypotheses rather than prove a dose response. The abstract also does not report risk of bias or a certainty rating. What it adds is the largest pooled randomized evidence so far that laser therapy reduces carpal tunnel pain, plus a first map of which settings may matter.

Staying with stimulation-based treatments, now in the spinal cord injury population. Alashram published a systematic review and meta-analysis in The Journal of Spinal Cord Medicine on transcutaneous electrical nerve stimulation for spasticity after spinal cord injury [2]. Seven studies met inclusion criteria, assessed with the Cochrane risk of bias tool, the PEDro scale and GRADE. Pooled clinical spasticity scores showed a large and statistically significant reduction after stimulation. The neurophysiological measure, the H to M ratio, showed no change at all. That split between a clinician-rated benefit and an unchanged reflex measure is the central tension in the paper. Heterogeneity across studies was very high, individual results were inconsistent, sample sizes were small, and methodological quality ranged from poor to fair. The author rated the certainty of evidence as low. No adverse events were reported. What this adds is a careful statement of where the evidence stands: a signal of benefit on bedside spasticity scales for this inexpensive modality, without physiological confirmation, and with the author calling for standardized randomized trials before effectiveness or mechanism can be established.

Also in The Journal of Spinal Cord Medicine, Sajeev and colleagues tested transcutaneous posterior tibial nerve stimulation as an add-on for neurogenic detrusor overactivity [3]. This was a prospective single-group study of 29 people with incomplete spinal cord injury and urinary incontinence, all already on long-term antimuscarinic therapy, treated in a physical medicine and rehabilitation department at a tertiary centre. Each patient received fifteen sessions of fifteen minutes at 20 hertz with a 200 microsecond pulse width, and urodynamics were repeated afterwards. Reflex volume rose by about 110 millilitres, maximum cystometric capacity rose by about 130 millilitres, and maximum detrusor pressure fell by about 15 centimetres of water, all statistically significant. Level of injury was associated with the change in reflex volume but not with the other two measures. The key limitation is design: there was no control or sham group, follow-up was short term, and outcomes were urodynamic surrogates. The abstract does not report incontinence episodes or quality of life. What it adds is early, uncontrolled evidence that a low-cost, noninvasive stimulation may improve bladder storage parameters on top of drug therapy in this group.

Now, four in brief.

Kovindha and colleagues, also in The Journal of Spinal Cord Medicine, analysed the Thai arm of the second International Spinal Cord Injury Community Survey, a cross-sectional study of 453 community-dwelling people with paraplegia recruited through fourteen rehabilitation facilities [4]. Just under half of respondents reported dependent bowel care despite normal arm function. In a model guided by a directed acyclic graph, three factors stood out. Dependent bed to wheelchair transfer was linked to roughly two and a half times the odds of dependent bowel care, inability to walk a moderate distance to about double the odds, and lack of medications, aids and supplies to about two thirds higher odds. These are self-reported, cross-sectional associations, so they identify targets rather than prove cause.

Turning to gait technology, Racis-Plantin and colleagues published an umbrella review in Disability and Rehabilitation on robot-assisted gait training for children with cerebral palsy [5]. Robotic training improved gross motor function, with standing and walking dimension E of the Gross Motor Function Measure showing the most consistent gains, especially with robotic training alone or against conventional therapy. Gains in standing dimension D were limited and heterogeneous. Effects on walking speed and step length were limited, with no consistent advantage over treadmill training or physiotherapy. The review covered only these outcomes, and its source reviews were heterogeneous, so the authors frame robotic training as an adjunct to conventional rehabilitation.

A related narrative review in PM&R from Vespa and colleagues examines why lower-extremity exoskeletons have not delivered more [6]. The authors argue that control systems are the central bottleneck. Most approved devices rely on weight-shift triggers, preset gait phases, impedance control or simple muscle-signal activation, which users find unintuitive and which demand substantial training. The review surveys emerging intent-detection methods, including brain-computer interfaces, peripheral nerve interfaces, ultrasound and mechanomyography signals, and regenerative surgery. This is a narrative review without pooled data, and it describes a research agenda rather than tested clinical benefit.

Farhan and colleagues, in the Journal of Rehabilitation Medicine, systematically reviewed 24 studies of extended reality serious games after limb amputation [7]. Phantom limb pain fell consistently, with augmented reality phantom motor execution systems reporting the largest effects. Virtual reality exergames improved gait and balance in two randomized trials, and immersive systems paired with muscle signals improved object manipulation and motor control. Usability and engagement were positive. The authors describe the benefits as preliminary, the link to cortical reorganization as exploratory, and real-world implementation as under-researched.

Three quick signals.

Begg and colleagues, in the Archives of Physical Medicine and Rehabilitation, compared single sessions of low-volume interval training and time-matched moderate continuous cycling in 18 patients with coronary artery disease in early cardiac rehabilitation in the United Kingdom [8]. Interval training produced higher oxygen uptake, heart rate, lactate and perceived exertion, with roughly double the time above the second ventilatory threshold. These are acute responses in a small single-centre sample.

In PM&R, Slocum and colleagues used a Delphi process to reach fifteen consensus quality measures for inpatient rehabilitation facilities [9]. The themes cover avoiding worsened health status, transitions of care, effectiveness, durability of gains after discharge, and patient comprehension. The panel was a convenience sample of six experts, and the measures have not yet been validated.

In Spinal Cord, Hilton and colleagues published a nine-item International Spinal Cord Injury Vocational Rehabilitation Basic Data Set, developed by consensus across six countries and four world regions with consumer input [10]. It standardizes how work functioning is recorded in practice and research. It is a consensus tool whose usefulness in practice has not yet been tested.

Stepping back across this week's papers, most of the evidence is secondary: reviews of reviews, meta-analyses of small and heterogeneous trials, consensus panels and a single uncontrolled cohort. Where benefits appear, they often sit on clinician-rated scales or physiological surrogates, and in at least one case the clinical signal and the mechanistic measure point in different directions. Few of these findings rest on new, adequately powered randomized trials with patient-reported or long-term functional outcomes.

If you only have time for one paper this week, make it the meta-analysis of low-level laser therapy for carpal tunnel syndrome [1]. It pools the week's largest body of randomized evidence on a common outpatient condition and moves the open question toward which laser parameters matter.

That's your roundup for This Week in Physical Medicine & Rehabilitation. The full transcript and references are available on the episode page. See you next week.

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This is an automated summary generated by artificial intelligence, which can make mistakes. Always review the original source materials.