Lunate Trabecular Structure: A Cadaveric Radiograph Study of Risk Factors for Kienbock’s Disease.

Author(s): Owers KL, Scougall P, Dabirrahmani D, Wernecke G, Jhamb A, Walsh WR

Source: J Hand Surg 35E:120-124, 2010.

The authors assess the trabecular structure in 29 cadaveric lunate bones using micro CT scans.  The bony trabeculae within the lunates were shown to run almost perpendicular to the proximal and distal lunate joint surfaces in the coronal plane.      
The cause of Kienbock’s disease remains uncertain, although several risk factors have been identified.  Trapezoidal-shaped lunates have non-parallel joint surfaces and are seen in association with negative ulnar variance wrists.  The authors opined that the trabecular orientation in lunates with non-parallel joint surfaces are not in-line to resist compressive forces and, consequently, may be susceptible to microfracture and avascular necrosis.