What shoulder range of motion is required for proper function of the TH cable system?

The proper function of the TH cable system, which is designed to enhance upper extremity movement in individuals with shoulder impairments, relies on specific ranges of motion that enable effective use of the device. The recommended shoulder range of motion that supports optimal use of this system includes 90 degrees of abduction, 90 degrees of flexion, and 30 degrees of extension.

Abduction at 90 degrees is critical because it positions the arm away from the body, allowing for better lever mechanics in the system. Flexion at 90 degrees provides a range that allows for a functional reach and manipulation of objects, crucial for daily tasks. The 30 degrees of extension complements this by allowing movement backward, further enhancing the versatility of arm positioning during functional activities. This combination provides a well-rounded capacity to perform various tasks while ensuring that the user can manipulate the cable system effectively and without strain.

Other ranges of motion provided in the other options do not meet the specific needs for maximizing the function and efficacy of the TH cable system. They may limit the ability to perform tasks effectively and could lead to challenges in coordination or strength when utilizing the cable system.