(Scapholunate dissociation) Scapholunate ligament interosseous tear resulting in increased distance (7mm) between the scaphoid and the lunate bones (Therry Thomas sign) (Normal distance < 4 mm). Proximal migration of the capitate bone.
Dorsally tilted lunate axis with increased scapholunate angle and capitolunate angles measuring 80°& 40°, (Normal <45° & < 30°)
Those findings are compatible with Dorsal intercalated segment instability (DISI).
Degenerative changes of the radioscaphoid and to less extent the intercarpal as well as the fifth carpometacarpal joints (most evident at the radioscaphoid joint) evident by narrowing of the joint spaces, marrow degenerative changes, including subarticular sclerotic bony change and remodeling involving the scaphoid bone.
Those findings are impressive of Scapholunate advanced collapse (SLAC) (Stage IV)
Subluxation of extensor carpi ulnaris tendon.