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Behavioral differences of functional ankle sprain recoveries during single-leg junp test

Abstract:

Objective: To analyze within subject differences in ground reaction forces. The tests were carried out by comparing the ankle with a previous lateral ligament injury (with permanent ligament loosening) and the one without ligament loosening. Material and methods: Eighteen volunteers were recruited for the study (8 women and 10 men), all of them physically active, with a mean age of 20.4 ± 1.9. The vertical ground reaction forces, the time of stabilization and the path of the center of pressures were measured during the landing and posterior stabilization in 3 single-leg jump tests on a force platform: jump landing test, lateral drop jump test and side hop test. Results: The second peak of the vertical force were greater in the uninjured limb during the jump landing test (injured = 1142.08 ± 242.50 N; uninjured = 1213.39 ± 299.89 N) (p<0.05).The medio-lateral time of stabilization was greater in the uninjured limb during the lateral drop jump test (injured = 12.83 ± 1.77 s; uninjured = 11.42 ± 2.14 s) (p<0.05). Conclusions: The injured limb presented lower vertical impact at the second peak force during the jump landing test, compatible with a softly landing which could be a defense mechanics. The injured limb showed an increased in the time of stabilization during the lateral drop jump test. However, there were no changes in any of the 3 tests in the excursion area of the center of pressure. The dynamic functional tests are useful to detect deficits in the specific axis where the tests are performed, as well as deficits after and an ankle injury.