# Prosthesis, Knee, Femorotibial, Unicompartmental, Semi-Constrained, Metal/Polymer, Mobile Bearing
> **Product code: NRA** · Class III — High Risk (PMA approval required, life-sustaining) · Unknown · —
## Classification
- **FDA Product Code:** NRA
- **Device class:** Class III — High Risk (PMA approval required, life-sustaining)
- **Regulation:** —
- **Review panel:** OR
- **Medical specialty:** Unknown
- **Submission type:** 2
- **GMP exempt:** N
- **Life sustaining:** N
- **Implant:** Y
- **Third-party review:** N
## Definition

This type of device is designed to allow for motion between the plastic tibial bearing and metal tibial baseplate components of a unicompartmental knee prosthesis.  It is intended to replace part of a knee joint in order to relieve pain and restore knee function, for indications such as osteoarthritis and avascular necrosis.

## Market data
- **Cleared 510(k) submissions:** 0
- **Registered establishments:** 13
## Source
- [FDA Device Classification](https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpcd/classification.cfm?ID=NRA)
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