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The Synthes USS are non-cervical spinal fixation devices intended for posterior pedicle screw fixation (T1-S2/ilum). posterior hook fixation (T1-L5), or anterolateral fixation (T8-L5). Pedicle screw fixation is limited to skeletally mature patients with the exception of the Small Stature USS, which includes small stature and pediatic patients. These devices are indicated as an adjunct to fusion for all of the following indications: degenerative disc disease (defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies), spondylolisthesis, trauma (i.e. fracture or dislocation), deformities or curvatures (i.e., scoliosis, and/or lordosis, Scheuermann's Disease), tumor, stenosis, and failed previous fusion (pseudoarthrosis).

When treating patients with Degenerative Disease (DDD), transverse bars are not cleared for use as part of the posterior pedicle screw construct.

When used with the 3.5 mm/6.0mm parallel connectors. the Synthes USS 6.0 mm rod systems can be linked to the CerviFix 3.5mm Systems. In addition, when used with 3.5 mm/5.0mm parallel connectors, the Synthes Small Stature USS can be linked to the CerviFix 3.5mm Systems. When used with the 5.0 mm/6.0mm parallel connectors, the Synthes Small Stature USS can be linked to the Syn-thes USS 6.0 mm rod systems. When used with the 5.5 mm/6.0mm parallel or extension connectors, Synthes USS 5.5 mm rod systems can be linked to the Synthes USS 6.0 mm rod systems. 5.5 mm/5.5 mm parallel or extension connectors can be used to link all Synthes USS 5.5 mm rod systems to one another. 6.0 mm/6.0mm parallel or extension connectors can be used to link all Synthes USS 6.0 mm rod systems to one another.

Rod-to-rod connectors can be used to link all Synthes USS 5.5 mm rod systems to one another.

When used with the 3.5 mm/6.0mm and 4.0 mm/6.0mm tapered rods, the Synthes USS 6.0 mm rod systems can be linked to the CerviFix 3.5 mm and 4.0 mm Systems, respectively. When used with the 3.5 mm/5.5 mm tapered rods, the Synthes USS 5.5 mm rod systems can be linked to the CerviFix 3.5 mm and 4.0 mm Systems, respectively. When used with the 5.5 mm/6.0mm tapered rods, the Synthes USS 6.0 mm rod systems can be linked to the Synthes USS 5.5 mm rod systems.

In addition, Synthes USS 6.0 mm rod systems can be interchanged with all USS 6.0 mm rods and transconnectors except Synthes 6.0 mm cobalt-chromium-molybdenum allov rods, which can only be used with USS Monoaxial Dual Core (Single-Opening) Screws. Synthes USS 5.5 mm rod systems can be interchanged with all USS 5.5 mm rods and transconnectors.

The Synthes USS is a comprehensive system of spinal implants and instruments for non-cervical spinal fixation devices intended for posterior pedicle screw fixation (T1- S2/ilium), posterior hook fixation (T1-L5), or anterolateral fixation (T8-L5). Currently cleared components of the system include monoaxial and polyaxial pedicle screws, rods, hooks, locking caps, transconnectors, transverse bars, parallel connectors, and extension connectors.

The provided text is a 510(k) summary from the FDA for a medical device called the "USS System," which is a thoracolumbosacral pedicle screw system. This document is a regulatory approval, not a description of a study proving a device meets acceptance criteria for an AI/ML algorithm.

Therefore, I cannot extract the requested information about acceptance criteria, study details, sample sizes, expert ground truth establishment, or MRMC studies because the document describes a mechanical medical device, not a software-based AI system that would typically undergo such validation.

The "Performance Data" section in the document refers to mechanical testing (dynamic compression bending) of the screw and rod, not performance metrics of an AI algorithm.

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