The Arcsplint™ helps to stop hyperextension, bending too far backwards, at the MCP knuckle joint. This splint cannot be worn on the thumb. Hyperextension at the MCP joint may be caused by Ehlers Danlos Syndrome.


  • MCP knuckle hyperextension

Arcsplint™ Knuckle Hyperextension

Will be worn on
  • Please find the ring size of the affected finger.

    It is HIGHLY recommended to use a ring sizer or multisizer to find your sizes. If you don't have a ring sizer already, I have sizers available here or feel free to purchase one elsewhere to take your measurements. A lot of times, a jeweler will help you find your ring sizes as well.

    If you have a sewing-type "fabric" tailor's tape measure, that can be used. Centimeters/millimeters are more accurate than inches, and a more narrow/skinny tape measure will be even more accurate. PLEASE NOTE: If using a tape measure, please allow for size discrepancy, usually on the large size. Tape measures can be off by as much as 3 ring sizes if done with too wide of a tape measure or in inches. Again, a ring sizer or multisizer is the best method. Once you have your cm/mm measurement, it can be converted into a US ring size at


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