Background: There is a risk of hip dislocation in children with spastic cerebral palsy. We evaluated the prophylactic effect of adductor tenotomy in patients with long-term follow-up.
Patients and methods: Our material comprised 78 patients (46 boys) with a mean age of 8 (2-17) years who underwent adductor tenotomy during the period 1986-1991. 40 patients had spastic diplegia and 38 had quadriplegia. For patients who had further hip surgery, follow-up was until the next hip operation. Those who had not undergone further surgery were invited to a follow-up examination. The migration percentage (MP) was measured on the preoperative and follow-up radiographs. The radiographic result was termed good if MP at follow-up was reduced or had increased less than 10%. The follow-up period was 10 (1.6-16) years, with a mean of 6 years for patients with later hip surgery and 13 years without such surgery.
Results: The clinical outcome was good in 51 cases, poor in 12, and uncertain in 15. The radiographic result was good in 39 of the 53 patients with radiographs available both preoperatively and at follow-up. The patients with good radiographic results had lower preoperative MP than those with poor results (MP 34% versus 49%) and lower preoperative acetabular index. The mean increase in MP (worst hip in each patient) was 1.9% per year, which is considerably less than that in nonoperated patients. Further hip surgery was necessary in 27 patients, because of increasing MP in 14 cases and for clinical reasons in 13.
Interpretation: Adductor tenotomy reduced the trend towards lateral displacement of the hip joints. The operation had a favorable outcome in approximately two-thirds of the patients. The operation should be performed before the MP reaches 50%.