What is the most appropriate next step in management for a 67-year-old woman with a distal radius fracture, wrist swelling, pain, and median nerve sensory deficit after a fall on an outstretched hand, with intact distal pulses?

Urgent Carpal Tunnel Release and Fracture Fixation

This patient requires urgent surgical intervention with carpal tunnel release and fracture fixation, ideally within 6-12 hours. The combination of a distal radius fracture with acute median nerve sensory deficit represents acute carpal tunnel syndrome, which is a surgical emergency requiring immediate decompression to prevent permanent nerve damage and complications such as reflex sympathetic dystrophy 1, 2.

Immediate Management Algorithm

Recognition of Acute Carpal Tunnel Syndrome

• The decreased sensation over the thumb and first three fingers indicates median nerve compression in the carpal tunnel 2
• This occurs acutely from hematoma, swelling at the carpal tunnel mouth, and/or volarly displaced fracture fragments compressing the median nerve against the flexor retinaculum 1
• In one series, 8 of 9 fractures with volarly displaced fragments developed median nerve compression 1

Surgical Urgency

• Carpal tunnel release and fracture fixation should be performed urgently to avoid permanent nerve damage and reflex sympathetic dystrophy 1, 2
• Delayed recognition and treatment leads to worse outcomes and higher complication rates 1
• The volar fragment can typically be identified on post-reduction radiographs, though you should proceed directly to surgery rather than attempting closed reduction first in this scenario 1

Surgical Technique Requirements

• Both carpal tunnel decompression AND fracture fixation must be performed together 1, 2
• Removal of the bony fragment alone without carpal tunnel release is insufficient 1
• Open reduction and internal fixation allows simultaneous visualization of the median nerve to exclude direct nerve injury, which can occur with highly displaced fractures 3

Critical Pitfalls to Avoid

Do Not Delay for Conservative Management

• While the AAOS/ASSH guidelines note that conservative management remains prevalent in patients >65 years old 4, the presence of acute median nerve symptoms overrides age-based treatment algorithms
• Acute carpal tunnel syndrome is an absolute indication for urgent surgery regardless of patient age 2

Do Not Perform Isolated Carpal Tunnel Release

• The fracture requires stabilization to prevent ongoing nerve compression from displaced fragments 1
• Median nerve compression is the most common complication of distal radius fractures, occurring more frequently than tendon rupture or malunion 5

Do Not Assume Nerve Function Will Return Spontaneously

• Without urgent decompression, this patient faces risk of permanent median nerve dysfunction and complex regional pain syndrome 1, 2
• The 1-year median neuropathy rate following operative treatment is 8.0%, but this reflects all cases including those treated urgently; delayed treatment has worse outcomes 6