Background:
The majority of patients who undergo a reconstructive pelvic osteotomy
because of symptomatic hip dysplasia are young women of childbearing
potential. The purpose of this paper was to evaluate the effect
of periacetabular osteotomy on the dimensions of the pelvic inlet
and outlet in these patients.
Methods:
The dimensions of the osseous pelvis of seven women with symptomatic
hip dysplasia were measured with use of magnetic resonance imaging
pelvimetry before and after periacetabular osteotomy. Four measurements
were made: the bispinous diameter, the anterior-posterior inlet
measurement, the anterior-posterior midpelvis measurement, and the
transverse inlet measurement. Radiographic correction obtained with
the osteotomy was documented with preoperative and postoperative
anteroposterior pelvic and false-profile radiographs.
Results:
Periacetabular osteotomy improved the Tönnis angle and the Lequesne
angle of the hip joint to an average of 8° and 30°, respectively.
The hip center of rotation was medialized an average of 8 mm. None
of the four measurements made with the magnetic resonance imaging
pelvimetry decreased substantially after the periacetabular osteotomy.
Conclusion:
Periacetabular osteotomy does not markedly alter the pertinent
pelvic dimensions in young female patients.