Figure 20. Posteroanterior view of the left wrist. Sclerotic margins at the scaphoid waist fracture indicate the presence of a nonunion. Osteophytosis, cartilage loss, and remodeling are seen at ...

wkes.eu The extensor carpi ulnaris (ECU) muscle plays a key role not only in the active movements of wrist extension and ulnar deviation but also in providing stability to the ulnar side of the wrist.