The primary stability between manual and robot assisted implantation of hip prostheses: A biomechanical study on synthetic femurs

Zeitschrift für Orthopädie und ihre Grenzgebiete
J DeckingW Plitz

Abstract

We investigated the initial stability of cementless stems implanted with robotic milling and conventional manual broaching. Proximally porous structured stems (G2, ESKA-Implants, Luebeck, Germany) were implanted into synthetic femora. In one group, the femoral cavity was prepared by a CT-based robot (CASPAR, URS-Ortho, Germany) with a high-speed milling head. In the other group, femora were rasped manually with broaches. The broaches had 1 mm proximal press-fit, the robotic cavities 1.5 mm. The implants were exposed to 15 000 loading cycles with 1 000 +/- 500 N. The direction of forces on the implant head were chosen to simulate stair climbing. Internal rotation and translation (caudal, dorsal and lateral) of the implants were measured by linear transducers. The robotic group showed significantly less reversible motion regarding translation in caudal, dorsal and lateral directions. The standard deviations of implant motions were smaller in the robotic group. Using robotic preparation of the femur, initial stability was higher and more consistent than with manual broaching, but differences in undersizing of the cavities created in the femur in relation to the implant may have contributed to these differences for the most part. I...Continue Reading

Citations

Dec 24, 2008·Journal of Biomechanical Engineering·Youngbae ParkYong-San Yoon
Dec 24, 2019·Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy·Itay PeretsBenjamin G Domb
Dec 2, 2020·SICOT-J·Pascal KouyoumdjianRemy Coulomb
Jan 12, 2021·EFORT Open Reviews·Jean-Pierre St MartZameer Shah

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