Definition
OA of the scapho-trapezium-trapezoidal joints
Epidemiology
50% patients with CMC OA have STT OA
F > M
Xray
Management
Non operative
NSAIDS
Rest
Splint
HCLA injection
Operative
Options
Excisional Arthroplasty
STT fusion
STT fusion
Dorsal approach
- base of thumb
- between EPB and EPL
- protect branches SRN
- excise distal scaphoid / proximal trapezium and trapezoid
- fix with K wire
- insert cancellous bone graft
Results
Srinivasan et al J Hand Surg Br 1996
- STT fusion in isolated OA in 8 patients
- good results in 7 patients
- 1 non union