Case Report: Ultrasound-guided nerve mobilization and rehabilitation for non-traumatic posterior interosseous nerve palsy associated with a ganglion cyst.

One patient. There was no control group and no blinding, so placebo effect and observer bias cannot be ruled out, particularly for the manual muscle testing grades, which are a therapist's judgement rather than a measured force. The two treatments overlapped in time and the authors state plainly that the initial aspiration may have started a slow recovery that overlapped with the mobilization, so the contribution of the mobilization cannot be separated from it. The velocity measurement came from a single session, before and after the first mobilization, and the authors describe it as exploratory and not validated as a clinical outcome measure. No nerve conduction studies or electromyography were done, so the severity of nerve damage at the start was never confirmed and this case cannot be compared with others on that basis. The outcome measures are either patient-reported or therapist-rated; the authors note that finger extension strength should be measured with a dynamometer in future work.

The authors declared that no financial support was received for this work or its publication.

Do not read this as evidence that ultrasound-guided nerve mobilization restores hand function in posterior interosseous nerve palsy. It is one patient with no control group and no blinding, and the authors themselves say the initial aspiration may have begun a slow recovery that overlapped with the mobilization.