Tenodesis grasp and release is an

orthopedic Orthopedic surgery or orthopedics ( alternatively spelt orthopaedics), is the branch of surgery concerned with conditions involving the musculoskeletal system. Orthopedic surgeons use both surgical and nonsurgical means to treat musculoskeletal ...

observation of a passive hand grasp and release mechanism, affected by wrist extension or

flexion Motion, the process of movement, is described using specific anatomical terms. Motion includes movement of organs, joints, limbs, and specific sections of the body. The terminology used describes this motion according to its direction relativ ...

, respectively. It is caused by the manner of attachment of the finger tendons to the bones and the passive tension created by two-joint muscles used to produce a functional movement or task (tenodesis). Moving the wrist in extension or flexion will cause the fingers to curl or grip when the wrist is extended, and to straighten or release when the wrist is flexed. File: Wrist related tenodesis effect, second step.JPG, Wrist extension tenodesis effect File: Tenodese_hand.JPG , Wrist flexion tenodesis effect The tenodesis grip and release mechanism is used in occupational therapy, physical therapy and rehabilitation of fine motor impairment, typically various levels of spinal paralysis, and in kinesiology and sports mechanics that are concerned with efficient grasp and release mechanics. Wrist extension is noted for bat grip in baseball.Tusakguchi, 2011: A Hitting Odyssey, Ch. 6 Batting Stance, -- http://rhm001.blogspot.com/2011/12/chapter6-batting-stance_1300.html. " cocking grip leads flexion of fingers because tendon of palm side is stretched by wrist-dorsiflexion. fingers are flexed by tension of tendon. And this phenomenon is called as a tenodesis-action in anatomical terms. By means of the tenodesis-action, we can hold our bat without gripping strongly by muscle contraction. As a result, our grip get the softness and stability at the same time. In this case, our palm is flexed along the lines of palm. It is the proper manner of finger flexion and baseball grip." Wrist extension is also noted in the form of grip used in most schools of Japanese swordsmanship or '' kenjutsu''.

References

Hand Orthopedics {{Med-sign-stub