The radial collateral ligament of the little finger MCP joint is the radial stabiliser of the most ulnar digit, preventing further ulnar deviation of the little finger.
The final radial collateral ligament of the digital sequence — the little finger is already the most ulnar digit, so its radial collateral must resist the strong intrinsic pull that would deviate it further ulnarly.
Little finger MCP radial collateral laxity in rheumatoid produces severe little finger ulnar deviation and MCP palmar subluxation. The little finger Swanson implant requires secure radial collateral reconstruction to prevent recurrence of ulnar drift.
Combined radial collateral laxity and palmar subluxation at the little MCP joint in advanced rheumatoid arthritis, requiring MCP joint replacement with collateral ligament reconstruction.
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