essex lopresti

Anatomy

3 facets

1.  Posterior facet (STJ)

2.  Middle facet (sustenaculum tali)

3.  Anterior facet (on distal medial aspect)

Anterior process 

- forms calcaneocuboid (CCJ) articulation

Thalamic portion 

- under lateral process talus

Tuberosities

Posterior tuberosity 

- posterior process / T Achilles attachment

Types

Dorsal

- most common

Volar

Causes

1.  Acute traumatic peripheral tear TFCC with DRUJ dislocation

- usually major trauma

- dorsal or volar

2A.  Distal radial fracture

Radial Head Fracture

Mechanism

FOOSH

- axial load with a valgus force

Biomechanics

1.  Provides Valgus stability

- especially if MCL deficient

2.  Longitudinal stability

- aided by interosseous membrane

3.  Load Transfer

- 60% of load at elbow