patella baja

Patella Baja

Aetiology

Congenital

Acquired

- trauma

- post ACL reconstruction / TKR

- chronic quadriceps rupture

Issues

Decreases ROM

Associated with early OA of the PFJ

Diagnosis

Blackburne-Peel ratio at 30 degrees flexion

Options

1. Always resurface

2. Never resurface

3. Selectively resurface

Decision Making

Controversial

- literature divided on issue

Historically

- poor outcomes due to poor implant design

- now improved designs

- non resurfacing also improved due to better design and improved techniques in regard to tracking and rotation

AP / Long Leg Views

Quantify Valgus Malalignment

Lateral Xray

1.  Assess Patella Alta

30^o flexion