Examination may disclose the patella still lying lateral to the joint ... the medial border of the patella reflecting the retinacular tear. It is important to realise that the anatomy was normal ...

and one on the outside (lateral) of the knee. These parts work together to prevent the kneecap from shifting out of its proper position. So, the tear in the medial retinaculum forced Porzingis ...

vch.ca The extensor mechanism (EM) of the knee comprises the quadriceps muscles and tendon ... ligament and the medial patellomeniscal ligament. Similarly, the lateral retinaculum is composed of three ...