During a tenodesis grip while holding a phone, which movement pattern best describes the relationship between wrist and finger movements?

During a tenodesis grip while holding a phone, which movement pattern best describes the relationship between wrist and finger movements?

• A. Active wrist flexion with passive finger extension
• B. Active wrist extension with passive finger flexion
• C. Active wrist extension with active finger extension
• D. Passive wrist flexion with passive finger flexion

Answer: (B)

In a tenodesis grip, the wrist acts as the driver for finger movement because the finger flexors and extensors cross the wrist. When the wrist moves into extension, the finger flexors are put on stretch and pull the fingers into a flexed position passively, which lets you grasp a phone without actively bending the fingers. If the wrist were flexed, those same finger flexors slacken and the fingers tend to extend passively, relaxing the grip. So, actively extending the wrist with the fingers remaining passive produces the gripping effect needed to hold the phone.

In a tenodesis grip, the wrist acts as the driver for finger movement because the finger flexors and extensors cross the wrist. When the wrist moves into extension, the finger flexors are put on stretch and pull the fingers into a flexed position passively, which lets you grasp a phone without actively bending the fingers. If the wrist were flexed, those same finger flexors slacken and the fingers tend to extend passively, relaxing the grip. So, actively extending the wrist with the fingers remaining passive produces the gripping effect needed to hold the phone.