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Materials 2017, 10(7), 805;

Wear Performance of Calcium Carbonate-Containing Knee Spacers

Laboratory of Biomechanics and Implant Research, Clinic for Orthopedics and Trauma Surgery, Heidelberg University Hospital, Schlierbacher Landstrasse 200a, Heidelberg 69118, Germany
Author to whom correspondence should be addressed.
Received: 3 May 2017 / Revised: 10 July 2017 / Accepted: 13 July 2017 / Published: 15 July 2017
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Articulating spacers should be wear-resistant and load-bearing to avoid prolonged immobilization of the patient and to reduce morbidity. However, due to the articulation of both components, a release of cement wear particles is to be expected. The aim of this study was to investigate the wear performance of a new spacer cement that contains calcium carbonate as a radio-opaque substance, in comparison to an established barium sulphate-containing spacer material, and also to characterize the amount, morphology, and size distributions of the released cement particles in detail. Force-controlled simulation was carried out on an AMTI knee simulator. The test parameters were in accordance with the standard ISO 14243-1 with a 50% reduced axial force. Tests were run for 500,000 cycles at a frequency of 1 Hz. For wear analysis, photographic documentation of the wear scars, gravimetric wear measurements and wear particle analysis were performed. The barium sulphate spacer material showed a total articular wear of 375.53 ± 161.22 mg. For the calcium carbonate-containing cement, reduced articular wear of 136.32 ± 37.58 mg was determined. Isolated cement wear particles of the barium sulphate-containing cement had a diameter of 0.429 ± 0.224 μm and were significantly larger compared to the calcium carbonate-containing cement (0.380 ± 0.216 μm, p = 0.02). The calcium carbonate-containing cement showed better wear performance in terms of gravimetric wear and particle release. Thus, calcium carbonate seems to be a promising material as a radio-opaque substrate in cement spacers. View Full-Text
Keywords: total knee arthroplasty; bone cement; spacer; wear; particles total knee arthroplasty; bone cement; spacer; wear; particles

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Mueller, U.; Reinders, J.; Smith-Romanski, S.; Kretzer, J.P. Wear Performance of Calcium Carbonate-Containing Knee Spacers. Materials 2017, 10, 805.

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