Upper extremity musculoskeletal modeling is becoming increasingly sophisticated, creating a growing need for subject-specific muscle size parameters. One method for determining subject-specific muscle volume is magnetic resonance imaging (MRI). The purpose of this study was to determine the validity of MRI-derived muscle volumes in the human forearm across a variety of muscle sizes and shapes. ...

Forearm compartment syndrome is a surgical emergency that usually requires release of the superficial muscle compartments. In some clinical situations it is imperative to also explore the deep muscle compartments. There are no anatomical guides for surgical exploration of the deep compartments that would minimize collateral damage to surrounding vessels, nerves, and muscles. Surgical injury in ...

Concomitant avulsion fractures of the extensor carpi radialis longus and brevis tendons are relatively rare injuries. The usual injury mechanism is forced hyperflexion to an actively extended wrist. No consensus exists regarding the appropriate management of this injury, with some surgeons advocating closed treatment and others favoring operative fixation. The authors describe a novel surgical ...

BACKGROUND AND PURPOSE Positioning a computer keyboard with a downward slope reduces wrist extension needed to use the keyboard and has been shown to decrease pressure in the carpal tunnel. However, whether a downward slope of the keyboard reduces electromyographic (EMG) activity of the forearm muscles, in particular the wrist extensors, is not known. SUBJECTS AND METHODS Sixteen experienced ...

BACKGROUND Occupational computer use has been associated with upper extremity musculoskeletal disorders (UEMSDs), but the etiology and pathophysiology of some of these disorders are poorly understood. Various theories attribute the symptoms to biomechanical and/or psychosocial stressors. The results of several clinical studies suggest that elevated antagonist muscle tension may be a biomechanic...

The extensor carpi radialis longus (ECRL) muscle originates from the distal third of the lateral supracondylar ridge of the humerus, front of lateral intermuscular septum and from the lateral epicondyle of humerus. The tendon of ECRL along with extensor carpi radialis brevis (ECRB) passes through the second compartment of extensor retinaculum and inserts into the base of second metacarpal bone ...