Normal stability of this joint depends on many factors including the bony shape of the patella and trochlea groove on the femur, integrity of the ligamentous structures and dynamic stabilizers of the joint such as the quadriceps muscle group.
Patients with this condition may describe a spectrum of symptoms ranging from vague anterior knee pain, episodes of giving way to complete patella dislocation. These problems commonly affect young active individuals, especially females and those involved with sporting activity.
Diagnosis is made on history and clinical examination with MRI scans being the gold standard. An examination under anaesthetic and diagnostic arthroscopy is sometimes required to plan further management.