A dynamic IP extension assist with an MP extension stop should be used if a patient:

A dynamic IP extension assist is designed to facilitate extension at the interphalangeal (IP) joints, making it particularly beneficial for patients who struggle with maintaining proper finger posture due to weakness or other issues. In the case where a patient has lumbrical weakness and exhibits hyperextension at the metacarpophalangeal (MP) joints, the use of a dynamic IP extension assist becomes crucial.

Lumbrical muscles play an essential role in flexing the MP joints while allowing for IP joint extension. When these muscles are weak, patients can have difficulty controlling the positioning of their fingers, resulting in the hyperextension of the MP joints. This hyperextension can lead to compromised hand function and potential functional limitations.

The dynamic extension assist can help stabilize the MP joints in a more neutral position, allowing for better control and function of the fingers during activities. It effectively provides the necessary support to maintain the MP joints in a proper position while permitting the needed motion at the IP joints, which is essential for tasks requiring fine motor skills.

In summary, the indication of using a dynamic IP extension assist aligns perfectly with the scenario presented, as it addresses the specific issue of lumbrical weakness and the resultant hyperextension of the MP joints, thereby aiding in