J. Hsin et al., EVALUATION OF THE BIOMECHANICS OF THE HIP FOLLOWING A TRIPLE OSTEOTOMY OF THE INNOMINATE BONE, Journal of bone and joint surgery. American volume, 78A(6), 1996, pp. 855-862
The biomechanics of the hip joint were evaluated in seventeen patients
(twenty-two hips), twelve to forty-one years old (mean, twenty-four y
ears old), who had a triple osteotomy of the innominate bone for treat
ment of symptomatic dysplasia of the hip, The duration of follow-up ra
nged from 2.2 to 13.8 years (mean, 6.8 years), Hip load, the area of t
he weight-bearing surface, and stress were determined from measurement
s on pelvic radiographs that were made preoperatively, postoperatively
, and at the time of the latest follow-up; the values were compared,vi
th those in twenty-one hips from control subjects, The Harris hip-rati
ng system. was used for clinical assessment, According to the biomecha
nical analysis, there was significantly less relative stress on the hi
p after the triple osteotomy and at the time of the latest followup (p
< 0.001 for both) than there had been preoperatively, The decrease in
stress was a direct result of a significant increase in the area of t
he weight-bearing surface of the hip (p < 0.001). The load on the hip
was not altered significantly, with the numbers available, The functio
nal outcome was improved substantially when the biomechanical goals we
re achieved, Through the application of basic biomechanical principles
, we were able to demonstrate the biomechanical efficacy of a triple o
steotomy of the innominate bone, We recommend the use of biomechanical
analysis as an adjunct to the clinical decision-making process in the
treatment of a dysplastic hip.