If the TD doesn't open all the way, what kind of problem is likely being encountered?

When the terminal device (TD) does not open all the way, the issue is likely related to an excursion problem. Excursion refers to the range of motion or distance that the TD can travel to fully open and close. If there is not enough excursion, it means that the mechanics controlling the opening of the TD are unable to extend sufficiently, which can prevent it from reaching the desired range.

This malfunction could arise from several factors, such as improper fitting of the prosthetic device, limitations in the cable or pulley system, or restrictions in joint movement at the elbow or shoulder. It is crucial to ensure that the prosthetic components are designed and assembled to provide adequate movement capabilities.

In contrast, a force problem typically involves an insufficiency in the amount of force being applied to open the device, which might be more about strength than range of motion. An alignment problem would suggest that the device is positioned incorrectly, affecting functionality in different ways but not specifically limiting opening range. A weight distribution issue usually deals with balance and may not directly relate to the motion of the terminal device opening. Understanding excursion helps in diagnosing and correcting issues related to the functional capabilities of the prosthetic limb effectively.