What is the acceptable axial pull displacement for a 50 lb weight in the TR cable system?

In a TR (Tension-Relaxation) cable system, the acceptable axial pull displacement refers to the amount of extension or movement that occurs within the cable system when under a specific load—in this case, a 50 lb weight.

The range of 12-25 mm is established as it strikes a balance that accommodates the system's operational parameters while ensuring adequate performance. It accounts for the necessary flexibility within the system for function and patient comfort, as well as mechanical integrity. When the system is under load, this range allows for both effective tension application and relaxation, which are critical in maintaining the intended biomechanics of the prosthetic limb.

Values that fall outside this range could either indicate insufficient cable movement, leading to potential operational stiffness, or excessive movement that might compromise the prosthetic's effectiveness and reliability. The chosen range ensures that the prosthetic remains responsive to user movements while also maintaining stability and control over time.