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Weakness of the medial triceps is very common. The medial triceps is like the VMO of the thigh; it activates the best during humeral external rotation and at the last degrees of extension.
Its weakness is commonly associated with triceps tendinopathy, ulnar nerve entrapment as it courses through the arcade of Struthers, as well as medial dislocations of the nerve or even the medial triceps itself (severe circumstances).