Epidemiology
Active pre teen boy
- activity related pain
- common in high jumpers
Diagnosis
Fragmentation / calcification of inferior pole
- repetitive traction injury where PT inserts
- tender at this point
Stages
I Normal
II Ca inferior pole irregularity
III Coalesce Ca inferior pole
IV Incorporation of Ca
DDx
Patella stress fracture
Sleeve fracture
Type 1 bipartite patella
Jumper's knee in older patient
Management
Self- limiting
- symptomatic treatment
- can use cast immobilisation
Rarely surgical excision