Key result
Testing of five JRI Orthopaedics Reverse Shoulder VAIOS 42 mm prostheses for 2.0 million cycles yielded a mean wear rate of 14.2 ± 2.1 mm3/10^6 cycles for the polymeric glenoid components.
The newly engineered Newcastle Shoulder Simulator successfully applies physiological motion and loading to wear test shoulder prostheses, yielding results consistent with hip simulator studies.
Provides preliminary wear data for reverse shoulder prostheses; leaves open translation to clinical performance pending in vivo validation.
This work aimed to engineer a multi-station shoulder simulator in order to wear test shoulder prostheses using recognized shoulder activities of daily living. A bespoke simulator was designed, built and subject to commissioning trials before a first wear test was conducted. Five JRI Orthopaedics Reverse Shoulder VAIOS 42 mm prostheses were tested for 2.0 million cycles and a mean wear rate and standard deviation of 14.2 ± 2.1 mm(3)/10(6) cycles measured for the polymeric glenoid components. This result when adjusted for prostheses diameters and test conditions showed excellent agreement with results from hip simulator studies of similar materials in a lubricant of bovine serum. The Newcastle Shoulder Simulator is the first multi-station shoulder simulator capable of applying physiological motion and loading for typical activities of daily living.
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Smith et al. (2016) studied this question. Newcastle Shoulder Simulator was evaluated on mean wear rate for the polymeric glenoid components. Testing of five JRI Orthopaedics Reverse Shoulder VAIOS 42 mm prostheses for 2.0 million cycles yielded a mean wear rate of 14.2 ± 2.1 mm3/10^6 cycles for the polymeric glenoid components.
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