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Received: 2004-02-19

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Journal of Zhejiang University SCIENCE A 2004 Vol.5 No.10 P.1270-1278


The dimensional accuracy of preparation of femoral cavity in cementless total hip arthroplasty

Author(s):  WU Li-dong, HAHNE H.J., HASSENPFLUG J.

Affiliation(s):  Department of Orthopedics, Second Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310009, China; more

Corresponding email(s):   ldwu@yahoo.com

Key Words:  Total hip arthroplasty, Femoral cavity preparation, Robotics-assisted surgery

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WU Li-dong, HAHNE H.J., HASSENPFLUG J.. The dimensional accuracy of preparation of femoral cavity in cementless total hip arthroplasty[J]. Journal of Zhejiang University Science A, 2004, 5(10): 1270-1278.

@article{title="The dimensional accuracy of preparation of femoral cavity in cementless total hip arthroplasty",
author="WU Li-dong, HAHNE H.J., HASSENPFLUG J.",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T The dimensional accuracy of preparation of femoral cavity in cementless total hip arthroplasty
%A WU Li-dong
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%P 1270-1278
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%DOI 10.1631/jzus.2004.1270

T1 - The dimensional accuracy of preparation of femoral cavity in cementless total hip arthroplasty
A1 - WU Li-dong
J0 - Journal of Zhejiang University Science A
VL - 5
IS - 10
SP - 1270
EP - 1278
%@ 1869-1951
Y1 - 2004
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.2004.1270

Objective: To observe the accuracy of femoral preparation and the position of the cementless prosthesis in femoral cavity, and to compare the results between the computer-assisted surgical group (CASPAR) and the conventional group. Methods: Ten femoral components were implanted either manually or by CASPAR in cadaver femurs. The specimens were cut to 3 mm thick slices. Microradiograms of every slice were sent to a computer for analysis with special software (IDL). The gaps and the medullary cavities between component and bone, the direct bone contact area of the implant surface, the gap width and the percentage of gap and bone contact area were measured in every slice. Results: In the proximal implant coated with HA of the CASPAR group, the average percentage of bone contact reached 93.2% (ranging from 87.6% to 99.7%); the average gap percentage was 2.9% (ranging from 0.3% to 7.8%); the maximum gap width was 0.81 mm and the average gap width was only 0.20 mm. While in the conventional group, the average percentage of bone contact reached 60.1% (ranging from 49.2% to 70.4%); the average gap percentage was 32.8% (ranging from 25.1% to 39.9%); the maximum gap width was 2.97 mm and the average gap width was only 0.77 mm. The average gap around the implant in the CASPAR group was only 9% of that in the manual group; the maximum and average gap widths were only about 26% of those in the manual group. On the other hand, the CASPAR group showed 33% tighter bone contact than the manual group. Conclusion: With the use of robotics-assisted system, significant progress can be achieved for femoral preparation in total hip arthroplasty.

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