The radial collateral ligament of the middle finger MCP joint connects the radial metacarpal head to the proximal phalanx base, stabilising the middle MCP joint against ulnar deviation.
| Origin | Dorsoradial aspect of the head of the middle finger metacarpal |
|---|---|
| Insertion | Palmar-radial base of the proximal phalanx of the middle finger |
Resists ulnar deviation of the middle finger at the MCP level, maintains alignment during power grip, and is assessed in comprehensive MCP joint reconstruction.
Middle finger MCP radial collateral laxity from rheumatoid pannus produces the characteristic ulnar drift, treated by synovectomy and collateral ligament reconstruction in early disease or Swanson arthroplasty in advanced cases.
Radial collateral ligament attenuation in rheumatoid arthritis producing middle finger MCP ulnar deviation, addressed by soft tissue reconstruction or MCP joint replacement.
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