The Journal of Bone and Joint Surgery, Vol 67, Issue 2 195-202, Copyright © 1985 by Journal of Bone and Joint Surgery, Inc
Varus derotation osteotomy in the treatment of persistent dysplasia in congenital dislocation of the hip
JR Kasser, JR Bowen and GD MacEwen
We have attempted to define the indications for and limitations of varus
derotation osteotomy in the treatment of persistent dysplasia in congenital
dislocation of the hip. We studied the cases of thirty-four patients
(forty-four hips) who were divided into three groups according to age at
operation, and evaluated the influence of femoral remodeling, age,
acetabular response, instability, and pre-existing avascular necrosis with
respect to the final results. The length of follow-up ranged from five to
twenty-two years. Rapid return to a valgus femoral neck-shaft angle by
remodeling was not a cause of failure in any age group. There were
consistently good results in the patients who were less than four years old
at the time of operation. Acetabular correction by remodeling occurred
through the age of eight years, but four of thirteen hips in patients who
were between the ages of four and eight showed persistent dysplasia despite
the operative procedure. The results were less predictable as the patients
approached the age of eight years. There was no benefit from isolated
femoral osteotomy in ten of eleven hips in patients who were older than
eight. Pre-existing avascular necrosis appeared to compromise the results
of the procedure in all age groups.