KeyLift^® XS

Expandable Interlaminar System for Lumbosacral Fusion

KeyLift XS is the only FDA-cleared expandable interlaminar stabilization device in the U.S. designed specifically for the L5–S1 lumbosacral junction. With an 18 mm footprint engineered for the unique interlaminar window at L5–S1, KeyLift XS opens supplemental interlaminar fusion at a level where traditional devices simply do not fit.

Why L5–S1 Demanded a Purpose-Built Device

The lumbosacral junction has a distinct anatomy. The interlaminar window is narrower, the angulation is steeper, and the working corridor is more constrained than at the levels above. Standard interlaminar implants are dimensioned for the broader thoraco-lumbar spine and often cannot be safely deployed at L5–S1.

KeyLift XS closes that gap. An 18 mm footprint, 4 mm of in-situ distraction, and a paired clamp engineered for the lumbosacral approach give surgeons a posterior, non pedicle option at the level where it has historically been hardest to deliver.

How KeyLift XS Works

KeyLift XS is implanted posteriorly between the L5 and S1 lamina and spinous processes. After insertion, the expanding distal end is deployed in situ, adding 4 mm of height to distract the level and decompress the affected nerve roots. The superior and inferior wings are crimped to the spinous process, and the paired KeyLift XS Clamp is attached to the implant for final fixation.

The Same Three Principles — Now at L5–S1

• Support. Fixation at the lamina, the strongest part of the posterior spinal column — critical at L5–S1, where spinous-process anatomy and bone quality can be especially variable.
• Lift. 4 mm of in-situ distraction, deployed once the device is seated. No removal and resizing.
• Stabilize. Positioned closer to the spine’s instantaneous axis of rotation, balancing the lumbosacral disc and supporting a stable fusion environment.

Indications for Use

The KeyLift Expandable Interlaminar Stabilization System is a posterior non-pedicle supplemental fixation device intended for use at a single level in the non-cervical spine (T1–S1). It is intended for plate fixation and attachment to the spinous processes and lamina for the purpose of achieving supplemental fusion in the following conditions: lumbar spinal stenosis, degenerative disc disease (defined as back pain of discogenic origin with degeneration of the disc confirmed by history and radiographic studies), spondylolisthesis, trauma (i.e., fracture or dislocation), and/or tumor. The KeyLift Expandable Interlaminar Stabilization System is intended for use with allograft or autograft bone and is not intended for stand-alone use.

AM01-0071