Definition
Flexed "humpback" deformity
- intrascaphoid angles >35o
- alters kinematics of wrist
Aetiology
Unstable displaced fracture
- non operative treatment
- distal segment flexes
- unites in poor position
NHx
DISI deformity
- carpal collapse
- pain and posttraumatic arthritis
Symptoms
Initially
- pain
- reduced motion
- reduced grip strength
Eventually
- arthritis
Management
Osteotomy
- volar approach
- osteotomy with osteotome
- cortico-cancellous bone graft
- cannulated screw