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NexGen® LPS-Flex Fixed Surgical Technique
Zimmer® NexGen® LPS-Flex Fixed Bearing Knee
Product Description
The NexGen Complete Knee Solution Legacy Knee Posterior Stabilized (LPS) LPS-Flex Fixed Bearing Knee is designed to accommodate resumption of high-flexion daily activities. Attention to patient selection, surgical technique, implant size, and rehabilitation can help enhance the chances for success. The NexGen Complete Knee Solution LPS-Flex Fixed Bearing Knee can be used with augments and stem extensions.
Many activities of daily living require flexion beyond 120 degrees. Consider climbing stairs (75°-140°), sitting in a chair and standing up again (90°-130°), or squatting (130°-150°).1 The LPS-Flex Fixed Knee extends the NexGen Complete Knee Solution to patients capable of up to 155 degrees of active flexion.
Extended posterior condyles on the femoral component facilitate tibio-femoral contact to support safe high flexion of up to 155 degrees. Conforming geometry of the LPS-Flex Fixed Femoral Component with its articulating surface allows minimal loss of contact area during high flexion.
The deep anterior patellar cut-out on the tibial articulating surface helps reduce patellar tension and provides greater clearance for the extensor mechanism.
A modified posterior stabilized cam/spine mechanism increases subluxation resistance at high flexion angles.
The fixed bearing articulating surface mates with current NexGen tibial baseplates (available with stem extensions and tibial augments) and uses the same polyethylene dovetail locking mechanism. Tibial component implantation uses existing NexGen instrumentation.
Refer to the package insert for indications, contraindications, warnings, precautions and adverse effects.
Product Brochure
References
- Niwa S. Hyperflexion in Japanese knee replacement design and clinical results. Paper presented at: The Wellington Knee Surgery Unit's Eighth International Teaching Meeting; March 5-6, 1998; London, England.
Indications: The NexGen® LPS-Flex/LPS-Mobile Bearing Knees are posterior-stabilized, cemented, knee prostheses indicated for patients with severe knee pain and disability due to osteoarthritis, traumatic arthritis, femoral avascular necrosis and moderate valgus, varus, or flexion deformities
Contraindications: The device is contraindicated in patients with affected joint or systemic infection, insufficient bone stock, osteoporosis, skeletal immaturity or severe instability of the joint.
Warnings: Do not reuse (single patient use only). All 17 and 20mm articular surfaces require a locking screw. Use only NexGen all-polyethylene patellas with these mobile knees. Do not use; any damaged component, components from other knee systems, CR, CRA, CR-Flex or any porous components.
Precautions: Use sizing charts to correctly match components. Safety and effectiveness of this device has not been established in patients with rheumatoid arthritis, collagen disorders, polyarthritis, or pseudogout; or in patients who need a revision total knee replacement.
Adverse Effects: Implant loosening due to osteolysis, tibiofemoral subluxation or bearing disassembly, dislocation, joint instability or knee stiffness.
Refer to the package insert for indications, contraindications, warnings, precautions and adverse effects.
