injection

Aetiology

Post-traumatic (type III clavicle fractures)

Idiopathic

4 patterns 

1. OA with osteophytes 

-  contribute to impingement

2. Osteolysis with resorption & gross osteoporosis 

Epidemiology

1 in 10 patients with symptomatic knees have isolated PFJ OA

Aetiology

Obesity

Repetitive deep flexion

Malalignment

Lateral patella tightness

Blunt trauma

Symptoms

Anterior knee pain

- rising from chair