Weber, Markus and Witzmann, Lena and Wieding, Jan and Grifka, Joachim and Renkawitz, Tobias and Craiovan, Benjamin (2019) Customized implants for acetabular Paprosky III defects may be positioned with high accuracy in revision hip arthroplasty. INTERNATIONAL ORTHOPAEDICS, 43 (10). pp. 2235-2243. ISSN 0341-2695, 1432-5195
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Purpose In revision hip arthroplasty, custom-made implants are one option in patients with acetabular Paprosky III defects. Methods In a retrospective analysis, we identified 11 patients undergoing cup revision using a custom-made implant. The accuracy of the intended position of the implant was assessed on post-operative 3D CT and compared to the pre-operative 3D planning in terms of inclination, anteversion, and centre of rotation. In addition, the accuracy of post-operative plain radiographs for measuring implant position was evaluated in relation to the 3D CT standard. Results We found a mean deviation between the planned and the final position of the custom-made acetabular implant on 3D CT of 3.6 degrees +/- 2.8 degrees for inclination and of -1.2 degrees +/- 7.0 degrees for anteversion, respectively. Restoration of center of rotation succeeded with an accuracy of 0.3 mm +/- 3.9 mm in the mediolateral (x) direction, -1.1 mm +/- 3.8 mm in the anteroposterior (y) direction, and 0.4 mm +/- 3.2 mm in the craniocaudal (z) direction. The accuracy of the post-operative plain radiographs in measuring the position of the custom-made implant in relation to 3D CT was 1.1 degrees +/- 1.7 degrees for implant inclination, -2.6 degrees +/- 1.3 degrees for anteversion and 1.3 mm +/- 3.5 mm in the x-direction, and -0.9 mm +/- 3.8 mm in the z-direction for centre of rotation. Conclusion Custom-made acetabular implants can be positioned with good accuracy in Paprosky III defects according to the preoperative planning. Plain radiographs are adequate for assessing implant position in routine follow-up.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | COMPONENT POSITION; KNEE ARTHROPLASTY; FOLLOW-UP; CUP; REPLACEMENT; RELIABILITY; Total hip arthroplasty; Revision; Custom-made implant; Acetabular Paprosky III defects; 3D CT |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Orthopädie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 26 Mar 2020 05:34 |
| Last Modified: | 26 Mar 2020 05:34 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26037 |
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