When the extensor carpi radialis brevis
(ECRB) muscle, which helps stabilize the wrist when the elbow is straight, is overused, the tendon can develop microscopic tears where it attaches to the lateral epicondyle, a bump on the end of the upper arm bone, the humerus.
Motor branches to the brachialis (MB), brachioradialis (BR), extensor carpi radialis longus (ECRL), extensor carpi radialis brevis
(ECRB); superficial branch of the radial nerve; PIN and its branches to the supinator were identified.
Overuse Can Weaken Tendons Tennis elbow stems from the extensor carpi radialis brevis
In the largest analysis to date, researchers and clinicians at Beth Israel Deaconess Medical Center (BIDMC) have compared the efficacy and safety of non-surgical treatment options for tennis elbow - also called enthesopathy of the extensor carpi radialis brevis
The extensor digitorum communis (EDC) tendons are retracted ulnarly and the extensor carpi radialis brevis
muscle (ECRB), extensor carpi radialis muscle (ECRL), and EPL are retracted radially exposing the underlying joint capsule.
Slight weakness of the extensor digitorum communis and extensor carpi radialis brevis
muscles was detected.
Carpometacarpal articulation Muscular attachment Trapezoid and second metacarpal Flexor carpi radialis Extensor carpi radialis longus Capitate and third metacarpal Extensor carpi radialis brevis
Hamate and fourth metacarpal Nil Hamate and fifth metacarpal Extensor carpi ulnaris Flexor carpi ulnaris
A marked reduction of activity in extensor carpi radialis brevis
(44%) and biceps brachii (23%) was observed while the patient performed a gripping task with the scapula position actively corrected, compared to no correction.
Lateral epicondylitis, or "tennis elbow," refers to chronic micro-tearing of the extensor carpi radialis brevis
and/or extensor digitorum communis.
To stabilize the wrist joint, the extensor carpi radialis brevis
(ECRB) is usually engaged.
Pathology of the extensor tendon is thought to originate with the extensor carpi radialis brevis
(ECRB) and may additionally incorporate the extensor carpi radialis longus (ECRL), and extensor carpi ulnaris (ECU) muscles.
The WDFHO enables persons with tetraplegic SCI to attain a functional tenodesis grasp that creates enough passive tension in the paralyzed thumb and finger flexor muscles (such as flexor pollicis longus, flexor digitorum superficialis, and flexor digitorum profundus) with active wrist extension by contraction of the innervated extensor carpi radialis brevis
(ECRB) and extensor carpi radialis longus (ECRL).