Study design: cross-sectional study in otherwise healthy athletic adults with a unilateral Achilles tendon rupture.
Objectives: define the relationships of active range of motion, calf circumference or number of heel raises to a full set of isokinetic parameters.
Background: Achilles tendon ruptures commonly occur during sports and create a considerable amount of morbidity. The benefits of different treatments are difficult to determine. Complex and expensive isokinetic testing is often required. If a simple force measurement could replace this testing, large clinical trials would be more easily feasible.
Methods: 74 patients with acute Achilles tendon rupture and surgical treatment were evaluated retrospectively.
Active range of motion (ROM), ratio of ROM, number of heel raises, ratio of heel raises, calf circumference and isokintetic measurements were recorded. Regression using a Bayesian elastic net showed the most important correlations.
Results: Active range of motion showed a significant correlation to peak torque angle at flexion and extension as well as increased sports activity.
There was a negative correlation to percuta neous therapy. Active Heel raise showed a positive correlation to peak torque at dorsal extension and increased sports activity as well as a negative correlation to high postoperative pain, where as calf circumference was positive correlated to peak torque at dorsal extension and body height as well as negative correlated to female gender.
Conclusion: device independent measures, like range of Motion, and amount of Heel raise, are an excellent tool providing similar information compared to isokinetic testing and could be used to evaluate clinical outcome after Achilles tendon rupture.