Fig. (1) The Dell’s radiological criteria for classification of trapeziometacarpal osteoarthritis. Stage I – Joint space narrowing and subchondral sclerosis but no evidence of subluxation or osteophyte formation. Stage II- Increased subchondral sclerosis and joint space narrowing. Formation of osteophyte at the ulnar border of the trapezium. Metacarpal is subluxated less than 1/3rd of the diameter of the base of trapezium. Stage III- Further loss of joint space. More prominent osteophyte at the ulnar border of the trapezium. The metacarpal is subluxated more than 1/3rd of base of the trapezium. Stage IV- Total loss of joint space, greater amount of subluxation/dislocation and the presence of pan-trapezial arthritis.