SCAPHO-TRAPEZIO-TRAPEZOID (STT) ARTHRITIS

Question 1

Main differential with STT arthritis

Answer 1

Base of thumb/ thumb CMC arthritis
STT arthritis generally painful with wrist ROM
CMC arthritis generally painful with thumb ROM

Question 2

3 main causes of STT arthritis

Answer 2

1. Progression of CMC arthritis = Eaton-Littler Stage IV
2. Progression of SLAC/ SNAC = Modified Watson Stage IV
3. Post-traumatic

Question 3

2 conditions commonly associated with STT arthritis

Answer 3

1. FCR tendonitis

2. Volar wrist/ carpal ganglions

Question 4

3 surgical options for STT arthritis

Answer 4

1. Trapezectomy and excision of proximal 1/3 trapezoid
2. Excision of distal pole of scaphoid
3. STT arthrodesis = preserves 60% ROM and 80% grip