Magnetic resonance imaging based anatomy of the conus medullaris: variations of location and morphology.

Background: In adults, the conus medullaris( CM) tip usually terminates at the mid aspect of the L1 vertebra. However, variations exist. Beside the location, differences in the CM's shape are believed to be closely related to neurological conditions.

Proximal row carpectomy: a motion-preserving procedure in the treatment of advanced Kienbock's disease.

Kienbock's disease is an isolated disorder of the lunate bone resulting from vascular compromise to the bone. In stage IV, degenerative changes are present at the midcarpal joint, the radiocarpal joint, or both. The goal of proximal row carpectomy (PRC) is the creation of a new joint between the capitate and the radius.