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The CastleLoc Spinal Fixation System is a pedicle screw system indicated for the treatment of severe Spondylolisthesis (Grade 3 and 4) of the L5-S1 vertebra in skeletally mature patients receiving fusion by autogenous bone graft having implants attached to the lumbar and sacral spine (L3 to sacrum) with removal of the implants after the attainment of a solid fusion. In addition, the CastleLoc Spinal Fixation System is intended to provide immobilization of spinal segments in skeletally mature patients as an adjunct to fusion in the treatment of the following acute and chronic instabilities or deformities of the thoracic, lumbar and sacral spine: degenerative Spondylolisthesis with objective evidence of neurological impairment, fracture, dislocation, scoliosis, spinal tumor and failed previous fusion (pseudarthrosis).

The CastleLoc Spinal Fixation System is a top-loading multiple component, posterior spinal fixation system which consists of pedicle screws, rods, set screws, and a transverse (cross) linking mechanism.

The CastleLoc Spinal Fixation System will allow surgeons to build a spinal implant construct to stabilize and promote spinal fusion. CastleLoc Spinal Fixation System implants components are supplied non-sterile are single use and are fabricated from titanium alloy (Ti-6Al-4V ELI) that conforms to ASTM F136.

The purpose of this submission is to add components of the type2 pedicle screw in CastleLoc Spinal Fixation System. Various sizes of these implants are available.

I am sorry, but the provided text does not contain the detailed information required to describe the acceptance criteria and the study that proves the device meets them, in the format you specified. The document is an FDA 510(k) premarket notification for a spinal fixation system, primarily focusing on establishing substantial equivalence to a predicate device.

Specifically, the text is a letter from the FDA to L&K Biomed Co., Ltd., regarding their CastleLoc Spinal Fixation System. It confirms that the device is substantially equivalent to a legally marketed predicate device. The "510(k) Summary" section outlines the device's identification, purpose, predicate devices, description, and indications for use.

While it mentions "Performance Testing" by stating: "Additional components of this system are not worst case. To verify worst case, we have performed mechanical test followed below standard. ASTM F 543", this is a very high-level statement indicating that mechanical tests were performed according to a specific ASTM standard.

The document does NOT provide the following crucial details that you requested:

• A table of acceptance criteria and reported device performance: It only generally refers to mechanical testing per ASTM F 543 but doesn't list specific criteria (e.g., pull-out strength, fatigue life) or the actual results achieved.
• Sample size used for the test set and data provenance: No information about the number of devices tested or if the data was retrospective/prospective or geographical origin.
• Number of experts used to establish ground truth and their qualifications: This is irrelevant for a mechanical device test, as "ground truth" typically refers to clinical or diagnostic accuracy, not mechanical performance.
• Adjudication method: Again, not applicable to mechanical testing.
• Multi reader multi case (MRMC) comparative effectiveness study: This type of study is for evaluating diagnostic devices where human readers interpret results, not for mechanical implants.
• Standalone performance: While mechanical tests are standalone in a sense, the document doesn't provide specific performance metrics.
• Type of ground truth used: Not applicable for a mechanical device.
• Sample size for the training set: Not applicable as this is a mechanical device, not an AI/ML algorithm requiring a training set.
• How the ground truth for the training set was established: Not applicable.

In summary, the provided document is a regulatory communication for a medical device and describes its equivalence to an existing product, but it does not contain the detailed performance study information with the specific criteria you requested.

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