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Langenbecks Arch Surg. 2003 Oct;388(5):291-7. Epub 2003 Sep 12.

The influence of alignment on the musculo-skeletal loading conditions at the knee.

Author information

1
Trauma and Reconstructive Surgery, Charité, Humboldt-University of Berlin, Augustenburger Platz 1, 13353 Berlin, Germany. markus.heller@charite.de

Abstract

BACKGROUND AND AIM:

High tibial osteotomies attempt to recreate physiologically normal joint loading. Previous studies have discussed the influence of mal-alignment on the distribution of static loads to the medial and lateral compartments of the knee. The aim of this study was to determine the influence of mal-alignment on the tibio-femoral loading conditions during dynamic activities.

MATERIAL AND METHODS:

Using a musculo-skeletal model of the lower limb, which had been previously validated with in vivo data, in this study we modified the alignment of the knee in four patients, from a normal position to the extremes of 8 degrees valgus and 10 degrees varus mal-alignment. The resulting tibio-femoral joint contact forces were examined while patients were walking and stair climbing.

RESULTS:

Varying the mal-alignment resulted in a highly individual response in joint loads. Deviations from the normal alignment produced an increase in loading, with valgus generating a more rapid increase in loading than a varus deformity of the same amount. Varus deformities of 10 degrees resulted in increases in peak contact force from an average of 3.3-times bodyweight (BW) up to a peak of 7.4 BW (+45% to +114%) while patients were walking, whilst increases of 15% up to 35% were determined for stair climbing. Increases of up to 140% were calculated at 8 degrees valgus during walking and up to 53% for stair climbing.

CONCLUSION:

This study demonstrated a clear dependence of the individual joint loads on axial knee alignment. Based on the sensitivity of joint loading to valgus mal-alignment, more than 3 degrees of over-correction of a varus deformity to valgus should be carefully reconsidered.

PMID:
13680238
DOI:
10.1007/s00423-003-0406-2
[Indexed for MEDLINE]

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