Long term follow-up after a Salter pelvic osteotomy.

The Salter pelvic osteotomy is a corrective osteotomy of the pelvis which is
performed in children with hip dysplasia between the ages of 1,5 to 4 years.
The UMCN has extensive experience with this procedure and we therefore have a
vast number of patients that have had their hip dysplasia treated in this
manner. This type of osteotomy, however, does not create a normal acetabulum
and it is therefore not unthinkable that several patients do develop
osteoarthritis of the hip at a relatively young age. Considering the impact of
this procedure (both with regards to the operative impact as well as the
postoperative treatment, which consist cast immobilisation for 6 weeks) it is
important to know in which patients this procedure will be a success and which
patients should be prepared for complications at a later age.
Next to that, part of these patients underwent an open reduction as well as a
pelvic osteotomy. As part of this open reduction, it was customary to resect
the labrum in order to properly reduce the hip. Lately, however, the importance
of the labrum in the development of the hip and preventing osteoarthritis has
become more and more clear and we are therefore curious to see which number of
these patients develop hip complaints after reaching skeletal maturity. In this
total population, there is also a group of patients who have undergone an open
reduction at a young age (under 1 year). In these patients, we are very curious
to see what the long-term consequences are of this early open reduction and
what the success rates are of Salter pelvic osteotomies.

- To determine the long-term results of Salter pelvic osteotomies.
- To determine the differences in outcome between an open reduction at a
relatively young age and an open reduction at the time of the pelvic osteotomy.

The plan is to look up all 77 patients and call them in for one visit to the
outpatient clinic. Before their visit they will be informed on the study
through the included leaflets. During their visit the following information
will be obtained;

- Physical examination; range of motion
- VAS painscore
- Harris hip score
- Oxford hip questionnaire
- Merle d'aubigne score
- Pelvic x-ray

For the patients, this amounts to a visit of 15-30 minutes in which they fill
out the questionnaires, get the physical examination and have an x-ray taken.
The radiological load is acceptable and amounts to a total of 0,31 mSvt.
If a patient has a lot of discomfort or even impaired range of motion, a
complete evaluation can be performed by one of the hospitals hip specialists
(Dr. Scheurs or Dr. Rijnen) and further treatment can be initiated.

- Visit to the outpatient clinic; not including travelling 15-30 minutes
- Physical examination
- Radiation: 0,21 mSvt; acceptable risk.