Title:The Effect of Lunate Morphology in Carpal Disorders: Review of the Literature
VOLUME: 16 ISSUE: 3
Author(s):Peter C. Rhee and Steven L. Moran*
Affiliation:Department of Orthopaedic Surgery, Mayo Clinic, Rochester, MN, Department of Orthopaedic Surgery, Mayo Clinic, Rochester, MN
Keywords:Lunate, morphology, Type II lunate scaphoid nonunions, scapholunate dissociations, scaphoid, radiodense arcs.
Abstract:Variation in lunate morphology can exist based on the absence (Type I) or presence
(Type II) of medial facet on the distal articular surface of the lunate that contacts the proximal pole
of the hamate. This additional lunatohamate articulation can affect load transmission across the radiocarpal
joint and exert an influence on carpal kinematics. A Type II lunate is protective against
carpal instability patterns associated with scaphoid nonunions and scapholunate dissociations. It
may also play a role in the progression of carpal collapse that occurs in Kienböck disease. This review
summarizes the effect of lunate morphology in the outcomes of non-operative and operative
treatment of carpal disorders.