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The patient-specific BC Reflex Unicompartmental knee arthroplasty (UKA) in patients with advanced knee osteoarthritis (OA) of the medial compartment with evidence of adequate healthy bone to support the implanted components. Candidates for unicompartmental knee replacement include those with:

· joint impairment due to osteoarthritis or traumatic arthritis of the knee,

· varus deformity of the knee, and

· as an alternative to tibial osteotomy in patients with unicompartmental OA.

The patient-specific BC Reflex Uni™ components fit within an envelope of dimensions that are specific to each patient. The BC Reflex Uni™ femoral component and tibial baseplate are intended for cemented fixation.

The BC Reflex Uni™ Knee System is a patient-specific prosthesis that consists of femoral and tibial implants for replacement of the medial tibiofemoral compartment of the knee. The patientspecific femoral and tibial components and single-use cutting guides are manufactured from CAD and CAM files generated from Bodycad and off the shelf software, which are based on MRI or CT images of the patient's knee and input from the surgeon. The BC Reflex Uni™ is for cemented use only and is sterilized by gamma radiation.

The subject of this 510(k) is an updated / new design of the femoral component and instruments for implantation, relative to the femoral component described in K163700 and K181302 for the predicate BUKS.

Materials: Wrought Cobalt-28Chromium-6Molybdenum Alloy (CoCrMo; ASTM F1537-11) for the femoral component, wrought Titanium-6Aluminum-4Vanadium ELI (Extra Low Interstitial) Alloy (Ti6A4V ELI; ASTM F136-13) for the tibial baseplate and locking pin, Ultra-High-Molecular-Weight Polyethylene (UHMWPE; F648-14) for the tibial insert.

The provided text is a 510(k) summary for the BC Reflex Uni™ Knee System, a medical device for unicompartmental knee arthroplasty. It describes the device, its intended use, and the performance data that supports its substantial equivalence to predicate devices. However, the document does not contain information about an AI/ML-based device, nor does it detail acceptance criteria or a study with human-in-the-loop or standalone AI performance, ground truth establishment, or expert involvement in a way that aligns with the questions posed in the prompt.

Therefore, I cannot extract the requested information regarding acceptance criteria, study details for AI/ML performance, sample sizes, expert involvement, and ground truth establishment from the provided document. The document discusses the substantial equivalence of the knee system based on mechanical testing and cadaver surgeries, not on the performance of a diagnostic AI system.

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