**Author details**

*Sports, Health and Exercise Medicine*

proprioception.

**6. Conclusions**

ing to the sporting activity.

muscles was greater for the left (nonoperated) limb. In the case of flexion, the difference was so small that it did not necessarily result from the injury and immobilization. In the case of extension, the power of the right limb muscles was significantly lower, accounting for 76% of the left lower limb power, whereas for the loads of 20 and 30 kg, this was 85 and 62%, respectively. The relatively good results for the load of 20 kg are likely to have resulted from the warm-up or increased patient motivation. However, overall tendency of the examination is the increasing disproportion between the value of peak power and the load: with the increasing load, the patient experienced more difficulty to achieve the result for the right leg similar to the left leg. The weakening of the quadriceps femoris muscle in the operated limb can be additionally confirmed by comparison of the first and second tests of the performed movement. Better result for the right and left limbs was achieved in the first test. Furthermore, the differences between the tests were substantially greater in the case of the operated leg. This means that the leg is not able to perform the extension movement twice with the same peak power, as it is the case with the left limb. Interestingly, the result of the jumping on the platform was better for the operated limb. This can be explained by the fact that, apart from the muscle strength, jumping ability is determined by such components as coordination and muscle balance, which may have resulted from the rehabilitation process which largely consisted in stabilization and working on the improved joint

The proposed method of peak power test may turn out to be valuable information for both the physiotherapist and the patient himself. In the case of a significant deficit in the operated limb, it will be advisable to extend the therapy or individual work of the patient focused mainly on the muscle rebuilding. Then, the jump test seems to be a good tool for the functional assessment of the limb in players return-

Knee dislocation is quite a rare injury and therefore the choice of the treatment method raises many doubts. The choice of the method has an effect on the therapeutic treatment. The questions concerning the effectiveness of PCL reconstruction have been often raised among the authors of other studies due to frequent complications following the intervention. In our case, due to the age and athletic lifestyle of the patients, the necessity of restoring a complete stabilization apparatus seemed to be indisputable. A two-stage reconstruction allowed for different therapies following PCL and ACL reconstructions. Much attention was devoted to protecting of the PCL graft. The significant role in preventing complications was played by wearing an orthosis. The orthosis that pushed the lower limb forward (Jack PCL) following the injury and anterior cruciate ligament reconstruction seems to be necessary during therapeutic procedure: in certain private clinics, patients are refused to undergo the intervention until the orthosis is prepared. After completion of rehabilitation, the doctor evaluated the joint as stable in anterior-posterior direction (negative Lachman test, drawer test) with the first degree lateral instability. The patient was further recommended to gradually increase the load during training, care for maintaining muscle balance, perform exercises correctly, and continuously work to improve proprioception. The histological examinations demonstrated that the period of graft remodeling is 3 years and proprioception should be constantly stimulated in this period [16]. The power tests were expected to additionally evaluate the rehabilitation and point to the potential changes in the procedure (greater emphasis on strengthening of the limb following the periods of immobilization).

**46**

Olga Łakomy1 , Robert Trybulski<sup>2</sup> , Artur Gołaś3 and Aleksandra Żebrowska1 \*

1 Department of Physiological and Medical Sciences, The Jerzy Kukuczka Academy of Physical Education, Katowice, Poland

2 Department of Medical Sciences, The Wojciech Korfanty School of Economics, Katowice, Poland

3 Department of Sport Training, The Jerzy Kukuczka Academy of Physical Education, Katowice, Poland

\*Address all correspondence to: a.zebrowska@awf.katowice.pl

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
