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Effect of Bearing Type on Taper Material Loss in Hips From 1 Manufacturer

Hothi, HS; Eskelinen, AP; Henckel, J; Kwon, Y-M; Blunn, GW; Skinner, JA; Hart, AJ; (2017) Effect of Bearing Type on Taper Material Loss in Hips From 1 Manufacturer. The Journal of Arthroplasty 10.1016/j.arth.2017.12.022. (In press).

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BACKGROUND: Numerous studies have reported on clinical significant volumes of material loss and corrosion at the head-stem junction of metal-on-metal (MOM) hips; less is understood about metal-on-polyethylene (MOP) hips. We compared the effect of bearing type (MOM vs MOP) on taper material loss for a hip system of a single design. METHODS: In this cohort study, we recruited retrieved MOM (n = 30) and MOP (n = 22) bearing hips that were consecutively received at our center. We prospectively collected associated clinical and imaging data. We measured the severity of corrosion and volumes of material loss at each head taper surface and used multivariate statistical analysis to investigate differences between the 2 bearing types. RESULTS: The median rate of material loss for the MOM and MOP groups was 0.81 mm3/y (0.01-3.45) and 0.03 mm3/y (0-1.07), respectively (P < .001). Twenty-nine of 30 MOM hips were revised for adverse metal reactions, compared with 1 of 22 MOP hips. CONCLUSION: MOP hips lost significantly less material from their taper junctions than MOM hips. Our results can reassure patients with MOP Pinnacle hips that they are unlikely to experience clinically significant problems related to material loss from the taper junction.

Type: Article
Title: Effect of Bearing Type on Taper Material Loss in Hips From 1 Manufacturer
Location: United States
DOI: 10.1016/j.arth.2017.12.022
Publisher version: http://dx.doi.org/10.1016/j.arth.2017.12.022
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: corrosion, hip, metal-on-polyethylene, taper, wear
URI: http://discovery.ucl.ac.uk/id/eprint/10046747
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