Humeral head resurfacing in central bone defects

• Verfasst von: Kasten, Philip [VerfasserIn]
• Verfasst von: Neubrech, Christine [VerfasserIn]
• Verfasst von: Raiss, Patric [VerfasserIn]
• Verfasst von: Nadorf, Jan [VerfasserIn]
• Verfasst von: Rickert, Markus [VerfasserIn]
• Verfasst von: Jakubowitz, Eike [VerfasserIn]
• Titel: Humeral head resurfacing in central bone defects
• Titelzusatz: In vitro stability of different implants with increasing defect size
• Verf.angabe: Philip Kasten, Christine Neubrech, Patric Raiss, Jan Nadorf, Markus Rickert, Eike Jakubowitz
• Umfang: 5 S.
• Fussnoten: Gesehen am 12.07.2018
• Titel Quelle: Enthalten in: Journal of orthopaedic research
• Jahr Quelle: 2012
• Band/Heft Quelle: 30(2012), 8, S. 1285-1289
• ISSN Quelle: 1554-527X
• DOI: doi:10.1002/jor.22074
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1577537424

Abstract

We examined the rotary motions of two distinct cementless surface replacement arthroplasties of the shoulder that were implanted on humeri with central spherical bone defects of 8%, 17%, and 37% of the head volume (n = 5 each). Rotary motions were measured under a cyclic torque application and translated into relative micromotions. Implant A with a perforated central crown had micromotions < 150 µm in all bony defects and during all simulated shoulder activities. Implant B with a central tapered tri-fin pin had no micromotions > 150 µm in defects of 0% and 8% during a strenuous activity like lifting 10 kg, but did exhibit micromotion > 150 µm in 40% of the experiments in defects of 17% and 37%, which could impair bony ingrowth. Implant B displayed a significant increase in micromotions for defects of 8% and 17% (p < 0.05). Our results suggest that implant A could be used without risk in spherical head defects up to 37% of volume, even in strenuous shoulder activities immediately after its implantation. Implant B, however, is recommended in spherical defects starting from 8% and only during light shoulder activities until bony integration of the implant has occurred. © 2012 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 30:1285-1289, 2012