Question

(1) For each of the following exercises, name two joints involved and one type of movement that occurs at each joint:

a. Chin ups:

b. Squats:

(2) Carol is a 22-year-old professional downhill skier who recently had knee surgery to repair a torn ligament; the injury was allowing the tibia to move anteriorly. Which ligament was repaired during surgery?

a. posterior cruciate

b. fibular collateral

c. anterior cruciate

d. tibial collateral

Answer 1

1. a. Chin ups - The joint involved in this exercise is elbow joint (ulnohumeral joint, radiocapitellar joint and proximal radionular joint) and shoulder joint. It produces flexion in the elbow joint with simultaneous extension of shoulder joint.

b. Squats - Hip joint and knee joint is involved in the exercise. The movement involved in this exercise is flexion, primarily due to contraction of liliopsoas muscle, and extension, majorly by gluteus maximus with the help of hamstrings.

2. Ligament repaired during surgery is anterior cruciate. It is the ligament responsible for movement of the knee front and backward. It stops the tibia bone from moving forwards in front of the femur. Hence injury was allowing the tiba to move anteriorly.