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The indications for use of these internal fixation devices include:

• Open and closed femoral fractures
• Pseudoarthrosis and correction osteotomy
• Pathologic fractures, impending pathologic fractures and tumor resections
• Supracondylar fractures, including those with intraarticular extension
• Fractures involving osteopenic and osteoporotic bone
• Fractures distal to a total hip prosthesis
• Periprosthetic fractures
• Nonunions and malunions

The struts of the T2 Alpha Femur Retrograde Nailing System are intended to be used only with the nails of this system; they are not to be used as stand-alone devices.

T2 Alpha Femur Retrograde Nailing System, previously cleared in K203819, consists of sterile implants (intramedullary nails in various diameter and sizes, compression screw and end caps), as well as nonsterile instruments (targeting devices).

The subject of this 510(k) submission is to introduce new devices of the T2 Alpha Femur Retrograde Nailing System. This line extension consists of anatomically pre-contoured struts and interlinking dowels designed to be used in combination with the existing nails of the T2 Alpha Femur Retrograde System for the treatment of complex fractures of the distal femur.

All struts are manufactured from Ti6Al4V ELI (Type II anodization) and are available in different sizes and left/right versions; these will be provided both non-sterile and sterile packaged. Interlinking dowels to the femoral nail are manufactured from CoCr and will be provided sterile packaged.

This appears to be a 510(k) clearance letter for an orthopedic implant, not an AI/Software as a Medical Device (SaMD). The document describes the "T2 Alpha Femur Retrograde Nailing System," which is a physical device used for internal fixation of femoral fractures.

Therefore, the information requested in your prompt regarding acceptance criteria, study details, expert ground truth, MRMC studies, standalone performance, and training/test set provenance does not apply to this clearance document. These criteria are typically evaluated for AI/SaMD products, where algorithmic performance and human-AI interaction are critical.

The provided document details:

• Device Type: Intramedullary fixation rod (physical implant).
• Performance Data: Non-clinical bench testing (fatigue strength, cut-out performance, stiffness, shear-off, pull-out, insertion, static bending, fretting corrosion, targeting accuracy, MR assessment, packaging) and references to clinical evidence from peer-reviewed scientific literature.
• Comparison to Predicate Devices: Focuses on material, manufacturing, intended use, and mechanical performance equivalence.

No mention of AI, algorithms, or software performance evaluation is present.

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