Osteotomy for "delta-phalanx" deformity.

A "delta phalanx" is often not triangular but may be trapezoidal. A "delta phalanx" may be present without a supernumerary digit. It is a form of complex syndactyly. Correction of the deformities of "delta phalanz" is obtained by open wedge osteotomy with excised bone fragments used as a graft and Z-plasty of the skin on the ulnar side of the finger.