Measurement of the Cement Thicknessaround the Femoral Stemin THRA: CAD Data Analysis Obtained from 3D Scanner.
10.4055/jkoa.2006.41.3.397
- Author:
Myung Rae CHO
1
;
Wee Tae PARK
;
Chang Min PARK
;
Sang Wook LEE
;
Shin Kun KIM
;
Koing Woo KWON
Author Information
1. Department of Orthopaedic Surgery, Daegu Catholic University Hospital, Daegu, Korea. cmr0426@lycos.co.kr.
- Publication Type:Original Article
- Keywords:
Cemented femoral stem;
Mantle thickness;
3-dimensional analysis
- MeSH:
Statistics as Topic*
- From:The Journal of the Korean Orthopaedic Association
2006;41(3):397-403
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: To measure the cement mantle thickness that developed from a rotation of the femoral stem in virtual space made by the broach. MATERIALS AND METHODS: The C stem and Versys stem of the subjects enrolled in this study were examined. A C250/400VZ(Steinbichler Co. Germany) and S/W: Geomagic & CATIA V5 was used to examine the three-dimensional configurations. The axial images were acquired after neutral placement of the femoral stem, horizontal rotation, coronal tilting, and a combination of both. The thickness was measured from the distance between the outer surface of the femoral stem and the closest vertex in the outer contour of the broach in cross-sectional images. RESULTS: The distance was <1 mm at the horizontal rotation of 3 degrees in the C stem, and at 5 degrees in the Versys stem. The distance was <1 mm at varus of 0.25 degrees in the C stem, and touched at 0.8 degrees. In the case of the Versys stem, the femoral stem touched at a varus of 1 degree. A combination of both horizontal and pivot rotation made the distance <1 mm at rotation of all angles. CONCLUSION: It might be necessary to develop a new instrument for the accurate insertion of the femoral stem along the broached space or to modify the stem design to stand against the change in the femoral stem position in the broached space.
