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Biomechanics of the wrist after proximal row carpectomy in cadavers

^* To whom correspondence should be addressed. E-mail: xuyongqingkm{at}yahoo.cn;zhuyuelianghu@sina.com.

	Abstract

We investigated the biomechanics of the radiocapitate joint after a proximal row carpectomy in six fresh-frozen cadaver wrists using super-low-pressure-sensitive film on a material testing system. The average pressure within the lunate fossa increased significantly from 23.2 to 136.4 N/cm² with a sharp decrease in the contact area from 2.08 to 0.30 cm² after a proximal row carpectomy. The cartilage of the proximal capitate had four sub-facets and therefore was not as smooth as the normal proximal lunate. We found that the wrist was overloaded after a proximal row carpectomy and the main cause was the anatomical mismatch of the radiocapitate articulation.

First published on September 28, 2009
Journal of Hand Surgery (European Volume) 2009, doi:10.1177/1753193409344527


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