Orthopedic Board Prep: Distal Radius Fracture Management & Surgical Indications MCQs
Key Takeaway
Surgical intervention for distal radius (Colles) fractures is primarily indicated when acceptable alignment cannot be maintained or achieved non-operatively. Key factors include persistent dorsal tilt (>10-20 degrees), radial shortening (>2-3mm), significant articular step-off (>1-2mm), severe comminution, and open fractures, especially after initial reduction attempts.
A 68-year-old female presents after a fall on an outstretched hand (FOOSH) with a 'dinner fork' deformity of her right wrist. Radiographs are presented below. Initial closed reduction under hematoma block achieves reasonable alignment, but post-reduction radiographs show a residual dorsal tilt of 15 degrees, radial shortening of 4 mm, and a positive ulnar variance of 2 mm. The fracture extends into the articular surface. Which of the following is the most significant indication for surgical intervention in this patient?
Candidate: "The most significant indication for surgery here is the unacceptable post-reduction radiographic alignment. Specifically, the residual dorsal tilt of 15 degrees and the 4 mm of radial shortening exceed the threshold for acceptable closed management. These parameters are indicators of an unstable fracture that will likely progress to malunion."
Candidates often focus on the "associated ulnar styloid fracture" or "the age of the patient" as the primary reason for surgery. Ulnar styloid fractures are common in high-energy injuries but are not an absolute indication for surgery unless there is clear evidence of DRUJ instability. Similarly, age alone is not a surgical trigger; it is the instability of the fracture pattern that dictates management.
A high-scoring answer follows a structured approach: "I would define this as an unstable distal radius fracture. The indications for ORIF are based on the persistent displacement post-reduction: specifically, a dorsal tilt >10 degrees, radial shortening >3 mm, and articular incongruity >2 mm. These exceed the Lafontaine criteria for instability. While I would also assess the patient's physiological status and functional demands, the primary indication is the inability to achieve/maintain acceptable anatomical reduction, which significantly increases the risk of post-traumatic arthrosis and DRUJ dysfunction."
