Comparing Quantification Methodologies for the Single-Leg Heel-Rise in Patients Following Operative and Non-Operative Management for Achilles Tendon Rupture.

Only 24 patients were tested, and the paper states the sample was underpowered for between-group comparisons of operative and non-operative treatment. The groups were not randomly assigned; patients were grouped by the treatment they had already received, so baseline differences such as age and follow-up interval may explain performance differences. The Calf Raise app was analysed from recorded video after the test, not in the real-time way it was designed to be used, so clinical performance may differ. Immediate feedback could influence technique or effort, and this study did not test that effect. Patients had to be able to complete the functional test, and those with re-rupture, opposite Achilles tendon rupture, or significant ankle, knee, or medical comorbidities were excluded, so results may not apply to more impaired patients. The study used one evaluation, so it cannot show how these devices perform across a rehabilitation course.

The authors reported no conflicts of interest. No funding statement was provided in the supplied text.

Do not conclude that the Calf Raise app can replace linear encoder or motion capture values in a patient's chart because the devices correlated strongly. The limits of agreement were wide, and the paper states that values from the devices cannot be used interchangeably.