A biomechanical evaluation of hinged total knee replacement prostheses

Robin Long, S Gheduzzi, Tom Bucher, Andrew Toms, A W Miles

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The number of total knee replacements being performed worldwide is undergoing an unprecedented increase. Hinged total knee replacements, used in complex salvage and revision procedures, currently account for a small but growing proportion of prostheses implanted. Modern hinged prostheses share the same basic configuration, allowing flexion–extension and tibial rotation. One aspect on which designs differ is the anteroposterior location of the hinge. A more posterior hinge is designed to increase the patellar tendon moment arm, reducing the quadriceps force required for a given activity and benefiting the patient. Five commonly used total knee replacements were evaluated in terms of quadriceps force and patellar tendon moment arm using a laboratory-based rig. Significant differences were identified between the five prostheses in quadriceps force and patellar tendon moment arm. Analysis of the correlation between these two parameters indicates that while patellar tendon moment arm influences quadriceps force, it is not the only factor. Also important is the lever function of the patella, and it is suggested here that the non-physiological nature of the prosthetic patellofemoral geometry may result in unnatural joint function. Thus, a thorough understanding of the resulting kinematic function of hinged total knee replacements is becoming increasingly important in complex revision total knee replacement to meet rising patient expectations and functional demands.
Original languageEnglish
Pages (from-to)875-883
Number of pages13
JournalProceedings of the Institution of Mechanical Engineers, Part H - Journal of Engineering in Medicine
Volume227
Issue number8
Early online date30 May 2013
DOIs
Publication statusPublished - Aug 2013

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