Author: Chris Moore, Nathan Lenz

Vol 03, No 3

1 January 2012

Summary

Functional outcomes are compromised in approximately half of all TKA patients. This loss is caused primarily by the anatomically inaccurate articular geometry and instability inherent to contemporary implants. The JOURNEY™ Bi-Cruciate Stabilized (BCS) Knee System (Smith & Nephew, Inc., Memphis, TN, USA) was the first TKA device to provide anterior-posterior stability throughout knee flexion, while enabling posterior femoral translation and external rotation inherent to the normal, healthy knee.

Together, these design features were thought to improve functional outcomes following TKA. The efficacy of this guided motion concept has since been verified in the published clinical literature. However, recent evidence has highlighted the potential for iliotibial band (ITB) syndrome or dislocation in some patients. Therefore, the latest virtual musculoskeletal modeling technology has been utilized to identify the key design parameters affecting the soft-tissue envelope in TKA. 

This extensive research has led to the development of the JOURNEY II BCS knee system (Smith & Nephew, Inc., Memphis, TN, USA), a recently validated design that combines the proven guided motion concept with physiological soft-tissue interaction and accountability. This system represents the next evolutionary step towards consistently restoring natural knee function following TKA.