Eliminating impingement optimizes patellar biomechanics in high knee flexion / 中华医学杂志(英文版)
Chinese Medical Journal
; (24): 2244-2248, 2010.
Article
in En
| WPRIM
| ID: wpr-237472
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WPRO
ABSTRACT
<p><b>BACKGROUND</b>We investigated the impact of eliminating the impingement between extensor mechanism and tibial insert on patellar tracking and patellar ligament tension in high knee flexion.</p><p><b>METHODS</b>Six cadaveric specimens were tested on an Oxford-type testing rig. The Genesis II knee system was implanted into each specimen knee with the traditional tibial insert and high-flex insert successively. Compared to traditional insert, the high-flex insert was characterized with a chambered anterior post and a chambered anterior lip which eliminates patella-post and patellar ligament-anterior lip impingements. The patella was tracked with an NDI Optotrak Certus system. The patellar ligament tension was measured using a NKB S-type tension transducer.</p><p><b>RESULTS</b>There was a decrease of resultant patellar translation relative to the femur with statistically significant (P<0.05) at 90 degrees to 150 degrees of knee flexion and a decrease of patellar ligament tension with statistical significance (P<0.05) at 100 degrees, 120 degrees, 130 degrees, and 140 degrees of flexion using high-flex insert compared to traditional insert.</p><p><b>CONCLUSIONS</b>Eliminating the impingement between extensor mechanism and implant in high knee flexion altered patellar tracking and reduced patellar ligament tension, which would facilitate high knee flexion.</p>
Full text:
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Index:
WPRIM
Main subject:
Physiology
/
Biomechanical Phenomena
/
In Vitro Techniques
/
Range of Motion, Articular
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Patellar Ligament
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Knee Joint
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Ligaments, Articular
Limits:
Humans
Language:
En
Journal:
Chinese Medical Journal
Year:
2010
Type:
Article