![]() ![]() This type of lesion does not result in a functional loss. The third type of lesion is damage to the sensory branch of the radial nerve. Wrist extension is intact, but the wrist tends to radially deviate due to muscle imbalance. ![]() It is characterized by aching on the lateral side of the elbow, difficulty with MCP finger and thumb extension, and difficulty with thumb abduction. Posterior interosseous nerve compression results in rapid motor loss, with no sensory loss. With radial tunnel syndrome, complaints of pain are usually in the radial nerve distribution of the distal forearm and will involve sensory problems without muscle weakness. state, “It is difficult for the conscientious diagnostician to accept the reality that the same nerve compressed in the same anatomical site can result in two entirely different symptom complexes.” Compression of the radial nerve just distal to the elbow between the radial head and the supinator muscle is typically called radial tunnel syndrome and is linked to repetitive forearm rotation. Radial tunnel syndrome and posterior interosseous nerve compression are two distinct types of compression syndromes that can occur in the same tunnel and with the same nerve. Compression usually causes this palsy, but lacerations or stab wounds can also be sources of lesions to the posterior interosseous nerve. The motor branch is the posterior interosseous nerve, and the sensory branch is the superficial branch of the radial nerve. After spiraling around the humerus and crossing the elbow, the radial nerve divides into a motor and a sensory branch. The second type of lesion involves the posterior interosseous nerve. Figure 13-4 Wrist drop deformity from a radial nerve injury. ![]()
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