Does Surface Topography Play a Role in Taper Damage in Head-neck Modular Junctions?

作者：Robin Pourzal, Deborah J. Hall, Nguyen Q. Ha, Robert M. Urban, Brett Russell Levine, Joshua James Jacobs, Hannah J. Lundberg · 发表于：Clinical Orthopaedics and Related Research · 年份：2016 · DOI：10.1007/s11999-016-4933-x · 被引用次数：56 · 研究领域：Orthopaedic implants and arthroplasty、Total Knee Arthroplasty Outcomes、Advanced materials and composites

BACKGROUND: There are increasing reports of total hip arthroplasty failure subsequent to modular taper junction corrosion. The surfaces of tapers are machined to have circumferential machining marks, resulting in a surface topography of alternating peaks and valleys on the scale of micrometers. It is unclear if the geometry of this machined surface topography influences the degree of fretting and corrosion damage present on modular taper junctions or if there are differences between modular taper junction material couples. QUESTIONS/PURPOSES: (1) What are the differences in damage score and surface topography between CoCr/CoCr and CoCr/Ti modular junctions? (2) How are initial surface topography, flexural rigidity, taper angle mismatch, and time in situ related to visual taper damage scores for CoCr/CoCr couples? (3) How are initial surface topography, flexural rigidity, taper angle mismatch, and time in situ related to visual taper damage scores for CoCr/Ti couples? METHODS: Damage on stem and head tapers was evaluated with a modified Goldberg score. Differences in damage scores were determined between a group of 140 CoCr/CoCr couples and 129 CoCr/Ti couples using a chi-square test. For a subgroup of 70 retrievals, selected at random, we measured five variables, including initial stem taper machining mark height and spacing, initial head taper roughness, flexural rigidity, and taper angle mismatch. All retrievals were obtained at revision surgeries. None were retrieved as a ...