Ratio between muscles’ peak torque and alteration of isometric and isokinetic peak torque of knee flexors and extensors after anterior cruciate ligament tear before surgery and after rehabilitation

Research object: Ratio between muscles' peak torque and peak torque of knee flexors and extensors in persons after anterior cruciate ligament tear. Research problem: It is the most common injury in the knee joint having a negative impact on the joint structure, changes of the related tissues and structures. Post-operative rehabilitation after such injury is mostly applied poorly. Human does not recover completely because of lack of facility or quality in rehabilitation – this increases the risk of recurrence for this injury. It is difficult to choose a special rehabilitation program, so performing researches in this study and analysis of researches is the best way to solve this problem The aim of research: To determine the ratio between muscles’ peak torque and alteration of isometric and isokinetic peak torque of knee flexors and extensors after anterior cruciate ligament tear before surgery and after rehabilitation. Goals of research: 1. To determine and compare isometric and isokinetic peak torque ratio between knee flexors and extensors before surgery and after rehabilitation after anterior cruciate ligament tear. 2. To determine and compare isometric and isokinetic peak torque of knee flexors and extensors before surgery and after rehabilitation after anterior cruciate ligament tear. Methods: The study was carried out in Lithuanian Academy of Physical Education, Human Motorics Laboratory from 2009 January to June 2009. One person was tested once a week; session length was 1 to 1.5 hours. The study involved 10 physically active non-trained men after anterior cruciate ligament tear. The mean age was 30.1 9.7 years, weight - 94.4 11.8 kg, height - 183.9 8.8 cm. All subjects had lesion in their right leg. Further investigations of muscle power and torque were carried out using the isokinetic dynamometer – Biodex. Conclusions: 1. Isometric peak torque ratio of knee flexors and extensors did not change before surgery and after rehabilitation but isokinetic peak torque ratio of injured knee flexors and extensors significantly increased after rehabilitation at low speed. 2. Isometric and isokinetic peak torques of knee flexors and extensors were established lesser after rehabilitation than before surgery