Tenodesis grasp

A passive hand grasp mechanism

Tenodesis grasp

Illustration of the wrist position in tenodesis grasp

The tenodesis grasp is a passive hand grasp mechanism that occurs due to the natural biomechanics of the wrist and finger tendons. It is particularly significant in individuals with certain levels of spinal cord injury where active finger flexion is impaired.

Mechanism

The tenodesis grasp relies on the anatomical relationship between the extensor and flexor tendons of the hand. When the wrist is extended, the fingers naturally flex due to the tension in the flexor tendons. Conversely, when the wrist is flexed, the fingers tend to extend. This phenomenon is due to the passive tension in the tendons and is utilized in rehabilitation to enable grasping in individuals with limited hand function.

Clinical significance

The tenodesis grasp is particularly important for individuals with tetraplegia resulting from cervical spinal cord injury. These individuals often lack voluntary control over their finger muscles but can still achieve a functional grasp by using wrist extension to passively flex the fingers. This allows them to hold objects and perform daily activities with greater independence.

Rehabilitation

In rehabilitation, therapists often teach patients how to use the tenodesis grasp effectively. This involves strengthening the wrist extensors and training the patient to use wrist movements to control finger position. Adaptive devices and splints may also be used to enhance the effectiveness of the tenodesis grasp.

Related pages

• Spinal cord injury
• Tetraplegia
• Rehabilitation
• Biomechanics