What does a left wrist scaphoid excision with high corner fusion and carpal tunnel release (decompression) involve?

What This Surgery Involves

This is a salvage procedure for advanced wrist arthritis where the scaphoid bone is removed, the remaining four corner bones of the wrist are fused together, and the carpal tunnel is released to decompress the median nerve.

The Three Components Explained

1. Scaphoid Excision

• The scaphoid (a boat-shaped bone on the thumb side of your wrist) is completely removed
• This bone is typically removed because it's either not healing properly (nonunion) or has caused arthritis in the wrist
• The tip of the radial styloid (a bony prominence on the thumb side) is also usually trimmed away

2. Four-Corner Fusion

• The four remaining carpal bones (capitate, lunate, triquetrum, and hamate) are fused together into one solid unit
• The surgeon removes the cartilage between these bones down to bleeding bone
• Bone graft (usually from the removed scaphoid) is packed between them
• Metal hardware (screws, plates, or wires) holds everything together while it heals
• This creates a stable but less mobile wrist that eliminates painful arthritis

3. Carpal Tunnel Release

• The transverse carpal ligament (a tight band across the palm side of the wrist) is cut open
• This relieves pressure on the median nerve that runs through the carpal tunnel
• This addresses numbness, tingling, or weakness in the thumb, index, middle, and half of the ring finger

Why This Surgery Is Done

This procedure treats advanced wrist arthritis (SNAC or SLAC wrist) that develops after:

• An old scaphoid fracture that never healed properly
• Ligament injuries between the scaphoid and lunate bones
• These conditions cause progressive arthritis and pain over years

What to Expect After Surgery 1, 2, 3

Pain relief is the primary benefit, with most patients reporting significant improvement 2, 3. Based on long-term outcomes:

• Wrist motion: Expect about 50% of normal flexion-extension (roughly 27° flexion and 27° extension compared to 58° and 52° in the normal wrist) 3
• Grip strength: Typically recovers to 50-76% of the opposite hand 2, 3
• Return to work: Most patients (87%) return to work, usually within 4 months 2, 3
• Fusion healing: Takes 2-3 months, though nonunion (failure to fuse) occurs in about 31% of cases, particularly around the triquetrum bone 2

Recovery Timeline

• Immobilization: 2-4 weeks in a splint or cast
• Rehabilitation: Range of motion exercises begin after immobilization
• Bone healing: 2-3 months for solid fusion
• Return to work: Average 4 months

Important Caveats

The carpal tunnel release component is well-supported by evidence showing surgical treatment relieves symptoms better than non-surgical options, though with more complications 1. The four-corner fusion provides predictable pain relief and functional improvement at the cost of reduced wrist motion 2, 3. Most complications occur within the first 2 years; after that, long-term satisfaction is high with minimal deterioration 2.