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Fig. 6. —Sonogram in 37-year-old man with extension deficit of thumb (patient 3 in Table 1). Longitudinal view of extensor pollicis longus (EPL) shows empty tendon sheath of EPL (r). Area of rupture (between stars) is indicated. Deep in relation to ruptured EPL tendon, extensor carpi radialis tendon (e) is shown. Left side is proximal; right side, distal.