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Functional Deficits in Chronic Mechanical Ankle Instability

Markus WenningDominic GehringMarlene MauchHagen SchmalRamona RitzmannJochen Paul

出版	Universität, 2020
URL	http://books.google.com.hk/books?id=HQMBzgEACAAJ&hl=&source=gbs_api

註釋Abstract: Background
The interaction of functional and mechanical deficits in chronic ankle instability remains a major issue in current research. After an index sprain, some patients develop sufficient coping strategies, while others require mechanical support. This study aimed to analyze persisting functional deficits in mechanically unstable ankles requiring operative stabilization.

Methods
We retrospectively analyzed the functional testing of 43 patients suffering from chronic, unilateral mechanical ankle instability (MAI) and in which long-term conservative treatment had failed. Manual testing and arthroscopy confirmed mechanical instability. The functional testing included balance test, gait analysis, and concentric-concentric, isokinetic strength measurements and was compared between the non-affected and the MAI ankles.

Results
Plantarflexion, supination, and pronation strength was significantly reduced in MAI ankles. A sub-analysis of the strength measurement revealed that in non-MAI ankles, the peak pronation torque was reached earlier during pronation (maximum peak torque angle at 20° vs. 14° of supination, p 0.001). Furthermore, active range of motion was reduced in dorsiflexion and supination. In balance testing, patients exhibited a significant increased perimeter for the injured ankle (p 0.02). During gait analysis, we observed an increased external rotation in MAI (8.7 vs. 6.8°, p0.02).