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The Kinamed Inc. Gem Knee System is indicated for use in reconstruction of the diseased knee joint caused by osteoarthritis, rheumatoid arthritis, post-traumatic arthritis. the need to revise failed arthroplasties or osteotomies where pain, deformity or dysfunction persist, and for patients suffering from correctable valgus or varus deformity and moderate flexion contracture. The Gem Knee System is designed for use with bone cement.

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The provided text is a 510(k) clearance letter from the FDA for the Kinamed Gem Knee System. This document does not contain any information about acceptance criteria, device performance studies, sample sizes, ground truth establishment, or expert involvement as requested in your prompt.

The letter explicitly states: "We have reviewed your Section 510(k) notification of intent to market the device referenced above and we have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to devices marketed in interstate commerce prior to May 28, 1976..."

This indicates that the clearance was based on substantial equivalence to a predicate device, rather than a clinical study proving the device meets specific performance acceptance criteria. Therefore, I cannot extract the requested information from this document.

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