The CMC joints of fingers 2 through 5 are small plane synovial joints between the metacarpal bases and the distal carpal row. The second and third CMC joints are essentially immobile, forming the fixed central column of the hand that does not move during grip. The fourth and fifth CMC joints allow 15 to 20 degrees of motion that permits the palm to cup around cylindrical objects and allows the hypothenar eminence to deepen during small object grip.
Fracture-dislocations of the CMC joints (excluding the thumb) occur from axial metacarpal loading and are often missed because they reduce spontaneously on relaxation. They are recognised on oblique radiographs of the hand, and failure to diagnose and stabilise them produces chronic CMC instability and pain.
Axial loading disruption of the ring and little finger CMC joints producing instability that may reduce spontaneously but requires surgical stabilisation if persistent.
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.
