Rotational alignment of the lower limb in osteoarthritis of the knee

Summary

Rotational alignement of the lower limbs in 43 patients with osteoarthritis of the knee was measured by computerized tomography. Eighty-four limbs were classified in three subsets, patellofemoral osteoarthritis (subset P), medial femorotibial osteoarthritis (subset M) and lateral femorotibial osteoarthritis (subset L). The femorotibial angle of subset M was 5° greater than that of subset P on the average. Femoral torsion of subset P was significantly greater than that of subset M. Femoral torsion in osteoarthritis of the knee was correlated with external tibial torsion and external torsion of the leg, which included both external rotation at the knee and external tibial torision. External torsion of the leg in subset M was less than normal and rotational alignment of subset P was also outside the normal range. Our findings show that the frontal and rotational alignment of the lower limb are aetiological factors in osteoarthritis of the knee.

Résumé

Nous avons mesuré par tomodensitographie l'alignement en rotation des membres inférieurs chez 43 malades atteints de gonarthrose. Les quatre-vingt-quatre membres ont été classés en trois sous-groupes: arthrose fémoro-patellaire (sous-groupe P), arthrose fémoro-tibiale interne (sous-groupe M) et arthrose fémoro-tibiale externe (sous-groupe L). L'angle fémoro-tibial du sous-groupe M était supérieur de 5° en moyenne à celui du sous-groupe P. La torsion fémorale du sous-groupe P était significativement plus importante que celle du sous-groupe M. La torsion fémorale dans la gonarthrose a été corrélée à la torsion tibiale externe et à la torsion externe de la jambe qui associe la rotation externe du genou et la torsion tibiale externe. La torsion externe de la jambe dans le sous-groupe M était inférieure à la normale et l'alignement en rotation du sous-groupe P était également en dehors des limites de la normale. Nos résultats montrent que l'alignement frontal et l'alignement en rotation du membre inférieur jouent un rôle dans l'étiologie de la gonarthrose.

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Correspondence to S. Takai.

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Takai, S., Sakakida, K., Yamashita, F. et al. Rotational alignment of the lower limb in osteoarthritis of the knee. International Orthopaedics 9, 209–215 (1985). https://doi.org/10.1007/BF00268173

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Key words

  • Osteoarthritis of the knee
  • Rotational alignment of the lower limb
  • Computerized tomography