Basic Biomechanics 5th Edition by Susan Hall

Exercise 15

Use the diagram in Sample Problem 8.2 as a model to determine how much compression acts on the patellofemoral joint when the quadriceps exert 400 N of tension and the angle between the quadriceps and the patellar tendon is (a) 140° and (b) 100°. 273.6 N, (b) 514.2 N)
Problem 8.2
Construct a chart listing all muscles crossing the knee joint according to whether they are anterior, posterior, medial, or lateral to the joint center. Note that some muscles may fall into more than one category. Identify the action or actions performed by the muscles listed in the four categories.