The Knee Is The Largest Joint Of The Body Essay

The Knee Is The Largest Joint Of The Body Essay

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The knee is the largest joint in the body; the joint is vital in supporting an individual when performing functional movements such as walking, running and jumping (Hamill, Knutzen and Derrick, 2014). A ligamentous tissue capsule surrounds the joint, supporting the structure of the synovial membrane. The fluid produced from the synovial membrane lubricates the knee. The synovial fluid and the infrapatellar bursa – designed to cushion external forces acting on the joint - allow the joint to move smoothing during activity (Hamill et al., 2014). In addition to these tissues, the joint consist of four bones – the femur, patella, tibia, and fibula - four primary ligaments and two crescent-shaped cartilage menisci (Behnke, 2012). The ligaments work in opposing pairs; collateral and cruciate ligaments. The medial and lateral collateral ligaments importantly resist Valgus and Varus movement, respectively. Additionally, the medical collateral ligament is designed to resist internal and external rotation occurring during movement. Conversely, the cruciate ligaments are cross-weaved in design to create a strong base of support in the intercondylar space (Behnke, 2012); attaching to different parts of the femur and tibia. Kannus et al. (1991) states the posterior cruciate ligament (PCL) is stronger and larger than the anterior cruciate ligament, unlike the ACL, contact injuries are more likely than non-contact due to its fibrous qualities. Furthermore, the PCL sits behind the ACL attaching to the posterior intercondylar area of the tibia, anteriorly moving to the intercondylar fossa of the femur. This prevents the tibia to extend too far backwards and the femur slipping forwards. Conversely, the ACL crosses in front of the PCL. It connects to...

... middle of paper ... is important to consider its relatedness to sports and activity an individual may participate in. Therefore, the inclusion of single-leg hops in functional tests improves the representation of physical demands an individual may experience in sports such as football. These protocols are more suitable to highlighting the instability of the injured limb, opposed to how other joints compensate (ref). Ref despite ACLr individuals with no signs of knee instability returning to sport, they still altered movements to protect the weakened limb. The concluding kinetic data highlighted ankle extensor muscles contributed greater than the ankle extensor muscles of an uninjured individual. Moreover, those still yet to return to sport, displayed a reduction in the range of motion about the knee joint, suggesting ACL remains stiffer throughout obtuse flexion and extension angles.

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