during the "screw home" mechanism, which is true? A. the patella moves superiorly as the knee...

during the "screw home" mechanism, which is true?

A. the patella moves superiorly as the knee flexes

B. the tibia internally rotates during extension

C. the tibia externally rotates during extension

D. the patella moves medially as the knee flexes

TRUE OR FALSE

A lateral ankle sprain is associated with excessive inversion movement of the calcaneus.

Expert Solution

Answer :

What is screw home mechanism :

The screw home mechanism , considerd to be a key element to knee stability, is the rotation between the tibia and femur. It occurs at the end of knee extension, between full extension (0⁰) and 20⁰ of knee flexion.

Option C is the correct answer. The tibia externally rotates during extension. The tibia rotates internally during the swing phase and externally during the stance phase. External rotation occurs during the terminal degree of knee extension and result in tightening of both cruciate ligaments, which locks the knee. The tibia is then in the position of maximal stability with respect of the femur.

True. Lateral ankle sprains usually occur during a rapid shift of bodycenter of mass over the landing or weight bearing foot. The ankle rolls outward, whilst the foot turns inward causing the lateral ligament to stretch and tear. Lateral ankle sprains are reffered to as inversion ankle sprains or as supination ankle sprains. It is usually a results of a forced plantar flexion / inversion movement, the complex of ligaments on the lateral side of the ankle is torn by varying degrees. The ligaments involved in this injury are anterior talofibular, calcaneofibular and posterior talofibular ligaments.

Sydney Mullin answered 1 year ago

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