Isokinetic profile of subjects with the ruptured anterior cruciated ligament
2016
Background/Aim. All changes in the knee that appear after anterior cruciate
ligament (ACL) lesion lead to difficulties in walking, running, jumping
especially during sudden changes of the line of movement. This significantly
impairs quality of life of these subjects and leads to decrease in physical
activity. Knee injuries make 5% of all most severe acute sport injuries. The
aim of the study was to determine strength of the thigh muscles in persons
with unilateral rupture of the ACL and to evaluate potential bilateral
differences between healthy and injured leg. Methods. This study involved 114
male athletes of different sport specialities with the clinical diagnosis of
ACL rupture. Each subject had unilateral ACL rupture and the other leg was
actually the control for this research. An isokinetic device was used to
evaluate the muscle strength of thigh muscles. Testing was performed for two
testing speeds, 60o/s and 180o/s. Results. Data analysis showed a
statistically significant difference (p < 0.01) between the ACL and the
healthy leg in the following parameters: peak torque for thigh extensors
(Ptrq_E), angle to peak torque during extension (Ang_E), power of extension
(Pow_E) and work during extension (Work_E). Analysing hamstrings to
quadriceps (H/Q) ratio we found the unilateral disbalance of thigh muscle
strength in ACL leg. Conclusion. A high level of validity makes isokinetic
dynamometry the method for evaluation of thigh muscles strength and leaves
this field of research open for new studies in order to improve both
diagnostic and rehabilitation of patients with the insufficient ACL.
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