STT OA

Definition

 

OA of the scapho-trapezium-trapezoidal joints

 

Epidemiology

 

50% patients with CMC OA have STT OA

F > M

 

Xray

 

STT OASTT Arthritis 2

 

Management

 

Non operative

 

NSAIDS

Rest

Splint

HCLA injection

 

Operative

 

STT OA

 

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