Minnaar-types

Carpal

coalition: 4 cases of a rare bony coalition between the capitate and trapezoid bone, with MRI findings in a symptomatic case.. (A-B) 38-year-old female (patient 3) with isolated CTC. Incomplete osseous fusion with distal joint space remnant (Minnaar type 2). (C-D) 63-year-old male (patient 4) with combined capitate-hamate (large arrows) and capitate-trapezoid (small arrows) coalition.

Carpal

coalition: 4 cases of a rare bony coalition between the capitate and trapezoid bone, with MRI findings in a symptomatic case.. (A) Narrowed CTJ with irregular, sclerotic margins (arrow). (B) CTJ filled with fibrovascular tissue (long arrow), (B-E) There is a surrounding bone marrow oedema, presence of subchondral cysts and the margins are irregular (short arrows).

Carpal

coalition: 4 cases of a rare bony coalition between the capitate and trapezoid bone, with MRI findings in a symptomatic case.. Type 1: narrowed CTJ, irregular sclerotic margins. Type 2: incomplete osseous fusion with (small, mostly distal) joint space remnant Type 3: complete osseous fusion. Type 4: = type 3 with other carpal congenital bony abnormalities.