This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
All of the following can be the complications of a malunited Colles fracture except : 
Select and explain. 
A. Rupture of flexor pollicis longus tendon, B. Reflex sympathetic dystrophy (RSD), C. Carpal tunnel syndrome, D. Carpal instability
A: Rupture of flexor pollicis longus tendon
Answer: A: Rupture of flexor pollicis longus tendon 
Explanation: Complications of Colle's fracture :

Complications in college's fracture are high (50 - 60%). Following complications may occur

1) The stiffness of fingers and joints :

The stiffness of finger, wrist and shoulder is the most common avoidable complication of Colle's fracture.

2) Malunion :

It is the second most common complication.
It results in dinner fork deformity.


Sudek's osteodystrophy (reflex sympathetic dystrophy).
Carpal tunnel syndrome.
Carpal instability.
Rupture of the extensor pollicis longus tendon.
Frozen shoulder syndrome.
TFCC injury.
Non - union is very rare.