# K180334: LEGION Knee System

- Pathway: 510(k) (Special)
- Applicant: Smith & Nephew, Inc.
- Decided: Mar 5, 2018 after 27 days
- Product code: JWH (Prosthesis, Knee, Patellofemorotibial, Semi-Constrained, Cemented, Polymer/Metal/Polymer)
- Device class: 2
- Regulation: 21 CFR 888.3560
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
Longest line of descent: 9 generations back to K850055 (1985). 38 ancestors in all.
4 later devices descend from it; 1 cites it directly.
0 of 42 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K043440: Smith & Nephew, Inc. Revision Knee System, Smith & Nephew, Inc. (2005) Summary page 4.
- K162775: Legion Cone System, Smith & Nephew, Inc. (2017) Summary page 4.

## Most influential descendants
- K230653: Smith & Nephew, Inc. ANTHEM Total Knee System, Genesis Uni Knee System, JOURNEY BCS and II Knee Systems, JOURNEY II CR Knee System, JOURNEY II Uni Knee System, Journey II UK Knee System, JOURNEY II XR Bi-Cruciate Retaining Knee System, JOURNEY PFJ System, JOURNEY Uni Knee System, Legion Hinge Total Knee System, Legion Total Knee System, ZUK Unicompartmental Knee System, ENGAGE Partial Knee System and Porous Patella and Porous Tibial Baseplates (2023), 3 descendants of its own
- K261462: LANDMARK Total Knee System (2026), 0 descendants of its own
- K241260: ACTIFY™ Unicondylar Knee System (2024), 0 descendants of its own
- K242711: JOURNEY II Unicompartmental Knee System (JOURNEY II UK) (2024), 0 descendants of its own

## Indications for use
1. Rheumatoid arthritis. 2. Post-traumatic arthritis, osteoarthritis, or degenerative arthritis. 3. Failed osteotomies, unicompartmental replacement, or total knee replacement. 4. Posterior stabilized knee systems are designed for use in patients in primary and revision surgery, where the anterior and posterior cruciate ligaments are incompetent and the collateral ligaments remain intact. 5. Constrained knee systems are designed for use in patients in primary and revision surgery, where the posterior cruciate ligament and one or both of the collateral ligaments (i.e. medial collateral and/or lateral collateral ligament) are incompetent. 6. Hinge knee systems are designed for use in patients in primary and revision surgery, where the posterior cruciate ligament and one or both of the collateral ligaments (i.e. medial collateral and/or lateral collateral ligament) are absent of incompetent. The LEGION Knee System - Finned Tibial Wedges are for single use only and are intended for implantation with bone cement.

Source page: https://510kreport.com/device/K180334
Methodology: https://510kreport.com/methodology