Mueller-Weiss disease
Definition
Spontaneous osteonecrosis of the navicular
navicular
Kohler's Disease
Definition
Osteonecrosis of the navicular
Epidemiology
Present at age 4-6 years
- same as Perthes disease
M:F 5:1
Bilateral in 20%
Aetiology
Repetitive trauma to maturing ossific nucleus
Navicular fractures
Types
1. Dorsal lip fracture / Tuberosity fracture
- avulsion fractures
- most common
- beware avulsion T post
2. Body fracture
3. Stress Fractures
Body Fractures
Types
A. Transverse fracture in coronal plane
B. Transverse from dorsolateral to plantarmedial
C. Central or lateral comminution