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The SCI BacFix® Ti Spinal Fixation System consists of a combination of components which include rods, hooks, locking wedges, screws, transverse connectors, cable-screws, cables and spinous process grommets which are indicated to provide temporary stability of the thoracic, thoracolumbar, or lumbar spine (T1 to S1).

When intended for pedicle screw fixation, implants are intended to provide immobilization and stabilization 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 or sacral spine: degenerative disc disease (defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies), degenerative spondylolisthesis with objective evidence of neurological impairment, fracture, dislocation, scoliosis, kyphosis, spinal tumor and failed previous fusion (pseudarthrosis). Levels of pedicle screw attachment for these indications range to T1 to the sacrum.

As a pedicle screw system, the BacFix® Spinal Fixation System is also intended for patients having Grade 3 or Grade 4 spondylolisthesis at LS-S1, when utilizing autologous bone graft, when affixed to the posterior when deling and intended to be removed after solid fusion is established. Levels of pedicle screw fixation for this indication are from L3 to the sacrum.

When intended for non-pedicle, posterior screw fixation of the non-cervical spine, the indications are:

• Idiopathic scoliosis.
• Neuromuscular scoliosis/kyphoscoliosis with associated paralysis or spasticity.
• Scoliosis with deficient posterior elements such as that resulting from laminectomy or myelomeningocele.
• Spinal fractures (acute reduction or late deformity).
• Degenerative disc disease (back pain of discogenic origin with degeneration of the disc confirmed by history and radiographic studies).
• Neoplastic disease.
• Spondylolisthesis.
• Spinal Stenosis.
• Failed previous fusion.

The cable-screws, cables and spinous process grommets are indicated for:

• Defect of pars lateralis.
• Spondylolisthesis.

Cables and spinous processes grommets may be used for interspinous wiring if additional stability is needed.

The Bach IT Spinal Fixation System is intended to or also with ASTM F136. The BacFix Spinal System is manufactured from thamall andy, which vehip.comectors and other ancillary components. The FTRaton System moudes secews, 1003, noored for market under K973687, and supplemented through II (calif Bach IX 11 Spillar Fixation System was cleared ink transverse connector), K003351 (addition of additional JTUK Submissions: Troughts (addition of end-to-end and side-by-side connectors).

The provided document describes the BacFix Spinal Fixation System and its substantial equivalence to a predicate device, the Isola Spinal System, rather than presenting a study to prove acceptance criteria for a novel device through clinical trials or performance metrics against specific targets. This 510(k) submission relies on nonclinical (biomechanical) testing to demonstrate equivalence.

Here's a breakdown based on the information provided:

1. Table of Acceptance Criteria and Reported Device Performance

Instead of traditional acceptance criteria with quantitative performance metrics, this submission uses the concept of "substantial equivalence" to a predicate device. The primary "acceptance criterion" is that the BacFix system's biomechanical properties fall within the established range of the predicate device.

2. Sample Size Used for the Test Set and Data Provenance

• Test Set Sample Size: Not explicitly stated in terms of number of devices or constructs. The document mentions "Mechanical testing was conducted on the stiffest and most flexible data collected for BacFix data." This implies a limited set of configurations or specimens were tested to represent the range of the device. The data provenance is not specified, but it would have been generated in a controlled laboratory setting (nonclinical).
• Data Provenance: Nonclinical, laboratory-generated biomechanical test data designed to conform to ASTM F1717-96 (Standard Test Methods for Spinal Implant Constructs in a Corpectomy Model).

3. Number of Experts Used to Establish the Ground Truth for the Test Set and Their Qualifications

Not applicable. This is a nonclinical bench test, not a study involving expert assessment of medical images or patient outcomes. The "ground truth" here is the physical performance of the device under mechanical load, measured against established engineering standards (ASTM F1717-96) and compared to a predicate device's known performance.

4. Adjudication Method for the Test Set

Not applicable. This is a nonclinical bench test. No adjudication by human observers is described.

5. If a Multi-Reader Multi-Case (MRMC) Comparative Effectiveness Study Was Done, If So, What Was the Effect Size of How Much Human Readers Improve with AI vs Without AI Assistance

Not applicable. This is a 510(k) submission for a spinal fixation system, not an AI/imaging device. No MRMC study was performed or described.

6. If a Standalone (i.e., algorithm only without human-in-the-loop performance) Was Done

Not applicable. This is a mechanical device, not an algorithm.

7. The Type of Ground Truth Used

The "ground truth" for this submission is the biomechanical performance data (stiffness range) of the BacFix system as measured according to ASTM F1717-96, and then compared to the known biomechanical performance data of the Isola Spinal System, also measured against the same standard. Essentially, direct physical measurement against a standardized test method.

8. The Sample Size for the Training Set

Not applicable. This is a mechanical device that does not use a "training set" in the context of machine learning.

9. How the Ground Truth for the Training Set Was Established

Not applicable, as there is no "training set" for this type of device submission.

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