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The APR Metasul Acetabular Inserts are intended for use with the APR Acetabular Shells and Metasul femoral heads in total hip arthroplasty for treatment of the following:

• patient conditions of noninflammatory degenerative joint disease (NIDJD); e.g., avascular ● necrosis, osteoarthritis, and inflammatory joint disease (IJD), e.g., rheumatoid arthritis.
• those patients with failed previous surgery where pain, deformity, or dysfunction persists. .
• revision of a previously failed arthroplasty. .

The APR Metasul Acetabular Insert is a modular metal insert which is hemispherical in shape and has an outer diameter manufactured from polyethylene (UHMWPE, ASTM F648). The outer diameter of the insert is machined with locking features that mate with one of the previously cleared APR metallic acetabular shells.

The inner diameter which forms the bearing surface of this insert features a metallic Metasul inlay that is integrally locked to the polyethylene portion. The metal inlay is manufactured from Protasul"-21WF, a wrought forged CoCrMo alloy (ISO 5832-4, ISO 5832-12). This inlay is polished to a mirror-finish and hot-pressed into the UHMWPE backing. Just prior to hot-pressing, two Protasul-10 (CoCr alloy, ASTM F562) pins may be press fit into the design of the inlay to help provide added rotational stability. As a result of the strictly controlled tolerances of the inlay and in order to recognize the beneficial wear properties associated with this component, this insert is designed for use only with previously cleared head components.

The APR Metasul Acetabular Insert component is available with outside diameters of 49mm to 81mm (in 2mm increments) with an inner diameter of 28mm.

This document does not contain information about acceptance criteria and a study proving a device meets these criteria. It is a 510(k) summary for a medical device (APR Metasul Acetabular Inserts) which describes the product, its intended use, and claims substantial equivalence to previously marketed devices.

There is no mention of specific performance measures, thresholds, or studies designed to assess the device against predefined acceptance criteria. Instead, the submission relies on demonstrating similarity in design, materials, sterilization, manufacturing methods, and intended use to existing cleared devices, as per the 510(k) pathway for medical device clearance in the US.

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