Thumb MCP Problems
Hyperextension of the middle joint of the thumb beyond a neutral position may result in a painful and unstable joint, decreased power, and difficulty in grasping large objects. Without stabilizing or “blocking” the hyperextension, the joint can become dislocated resulting in a loss of function.
For Thumb MCP Hyperextension
Use the SIRIS™ Thumb MCP Splint to block hyperextension of a MCP joint. Use on thumbs that can actively abduct; do not use on thumbs that are adducted. A bracelet is available to secure this splint on the thumb. Other options are:
SIRIS™ Thumb MCP Splint with PVX
Use the SIRIS™ Stable Thumb Splint when extension at the thumb MCP joint is needed and the MCP joint has the ability to be passively corrected to neutral. A bracelet comes standard and links can be removed for optimal fit. The bracelet keeps the splint from migrating and is attached with a clasp (standard) or an S-hook (optional – if fine motor skills are limited). This splint can easily be worn at the same time with a splint on the IP joint.
For Hyperextension and Flexion
Use the SIRIS™ Stable Thumb Splint with Proximal Volar Extension (PVX) when there are significant CMC changes (very little or no motion at the CMC joint, a “step off” or subluxation at the CMC joint) or if the thumb moves predominantly in an adducted prehension pattern when grasping. This splint stabilizes the MCP joint dorsal and volar to prevent hyperextension and flexion. It is used for MP hyperextension when there are significant joint changes at the CMC joint with an adducted prehension pattern. A bracelet keeps the splint from migrating and is attached with a clasp (standard) or an S-hook (optional – if fine motor skills are limited). This splint can easily be worn at the same time with a splint on the IP joint.