The radial collateral ligament of the index finger MCP joint is a strong cord connecting the radial side of the metacarpal head to the radial base of the proximal phalanx, providing the primary radial stability of the index MCP joint.
Resists ulnar deviation forces at the index MCP joint during lateral pinch — the index finger is subjected to the highest radial collateral ligament stress during key pinch against the thumb. Prevents palmar subluxation of the proximal phalanx during flexion.
Index MCP radial collateral ligament laxity in rheumatoid arthritis produces the classic ulnar drift deformity — the radial collateral ligaments of all fingers attenuate, allowing progressive MCP ulnar deviation. In Swanson arthroplasty, collateral ligament balancing is a key component of the procedure.
Acute or chronic laxity of the radial MCP collateral ligament producing index finger ulnar deviation and impaired lateral pinch, managed by ligament repair or reconstruction.
This website uses cookies to enhance your experience. Some are essential for site functionality, while others help us analyze and improve your usage experience. Please review your options and make your choice.
If you are under 16 years old, please ensure that you have received consent from your parent or guardian for any non-essential cookies.
Your privacy is important to us. You can adjust your cookie settings at any time. For more information about how we use data, please read our privacy policy. You may change your preferences at any time by clicking on the settings button below.
Note that if you choose to disable some types of cookies, it may impact your experience of the site and the services we are able to offer.
Some required resources have been blocked, which can affect third-party services and may cause the site to not function properly.
This website uses cookies to enhance your browsing experience and ensure the site functions properly. By continuing to use this site, you acknowledge and accept our use of cookies.
