| Objective:Measurement of Chinese proximal humeri for the design of humeral prosthesis component by CT osteometry. Methods:Fifty paired embalmed cadaveric humeri (twenty-five pairs:fourteen from male donors and eleven from female donors) were scanned in medial-lateral(ML) and anterior-posterior(AP) position according to the humeral retroversion by CT. Images of the humeri in the transverse planes at the lowest border of neck(LBN),20mm and 40mm distal of LBN(LBN-20,LBN-40), isthmus, head-neck anterior-posterior(HN-AP)were obtained. Sixty-one extracortical and intracortical parameters were measured exactly by image analytic computer software that included offset, head position, head-shaft angle, head to tuberosity height (HT), head thickness, curvature radius, articular surface arc (SA), neck diameter, isthmus position, proximal and distal border of isthmus, maximum coronal and sagittal diameter of medullary canal and thickness of cortical bone in four planes, including LBN, LBN-20,LBN-40 and isthmus. Additionally, flare index (FI), flare variation (FV) and cortico-medullary index (CMI) were also gained. All the measurements wereunderwent statistical analysis by SAS system .Results: Based upon the results of this analysis ,the means ,standard deviation, minimum and maximum of all parameters were obtained.The principles of the frequency distribution, correlation and confidence in part parameters were also found.The means and standard deviation of all parameters in male and female, right and left were acquired .In addition,profound differences were observed between male and female,the Chinese and the Caucasian .However, there were no significance difference between right and left.Conclusion:The author consider that it is mandatory to design the humeral components fitting the feature of the humeri of the Chinese and diversifying the size, consider the difference of gender on designing and selecting of prostheses.
|
PDF Full Text Request