Abstract
A gait analysis system was used to evaluate the kinematics of the hip and knee during stair ascending and descending after operation with total knee replacement. Patients with 5° varus/valgus alignment or less were selected randomly to receive either a flat or a concave tibial component with retention of the posterior cruciate ligament. Patients who had more than 5° varus/valgus alignment and/or an extension defect of 10° or more were selected randomly to receive the concave or posterior-stabilized tibial component with resection of the posterior cruciate ligament. Twenty patients and 17 controls were studied 1–2 years after the operation. Patients had abnormal kinematics during stair ascending and descending. Both knee extension and flexion were reduced. Hip extension tended to decrease, and decreased hip extension moment was noted.
Résumé
Un system d’analyse de la marche a été utilisé pour évaluer la cinématique de la hanche et du genou pendant la montée et la descente d’escalier après prothèse totale du genou. Les malades avec 5° ou moins de varus/valgus ou moins ont été randomisés pour recevoir un composant tibial plat ou concave avec conservation du ligament croisé postérieur. Les malades qui avaient plus de 5° de varus/valgus et/ou un défaut d’extension de 10° ou plus ont été randomisés pour recevoir un composant tibial concave ou un composant postéro-stabilisé avec résection du ligament croisé postérieur. Vingt et un malades et 17 contrôles ont été étudiés une à deux années après l’opération. Les malades avaient une cinématique anormale pendant la montée et la descente l’escalier. L’extension et flexion du genou étaient plus faibles. L’extension de la hanche avait tendance à diminuer et une augmentation du moment de flexion a été noté.
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Acknowledgements
This project was financially sponsored by the Swedish Medical Research Council, the Ingabritt and Arne Lundbergs Research Foundation, and the Félix Neubergh Research Foundation.
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