Adjei, MD Patellofemoral stress syndrome (PFSS), also known as "runner's knee" or "jumper's knee," is a type of overuse injury that causes pain in the soft tissues and bone in the front of the knee.

In ACLR and uninjured contralateral knees, the patella articulates higher on the femoral trochlea due primarily to a longer patellar tendon compared with healthy knees.

Compared with healthy controls, ACLR patients had a higher vertical position of the patella and a higher location of articular contact between the patella and the femur. A higher riding patella in the ...