Final answer:
The most common contracture after a Below Knee Amputation (BKA) is a knee flexion contracture, which is a result of the knee being in a flexed position for too long. Preventing such contractures is important in rehabilitation following an amputation. The metacarpophalangeal joint, not the hip joint, is classified as a biaxial diarthrosis.
Step-by-step explanation:
The #1 contracture problem after a Below Knee Amputation (BKA) is b) Knee flexion contracture. This form of contracture occurs when the knee remains in a flexed position for an extended period, resulting in shortening of the muscles and tendons around the knee, thereby limiting the patient's ability to extend the knee fully. In lower limb amputations such as BKA, maintaining proper positioning and engaging in regular physical therapy can help prevent knee flexion contractures.
During flexion movements, such as when bending down to touch your toes, both the hip joint and knees are flexed. This reduces the angle between the bones in the joints. On the contrary, extension would increase that angle. It's important for individuals who have undergone BKA to manage their limb positioning to prevent hip and knee flexion contractures.
The metacarpophalangeal joint is classified as a biaxial diarthrosis which permits movement along two axes. The hip joint, while also being highly mobile, is a multiaxial joint, allowing for a wider range of motion including flexion, extension, abduction, adduction, and even rotation.