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Outcome at forty-five years after open reduction and innominate osteotomy for late-presenting developmental
Simon R Thomas1, John H Wedge, Robert B Salter
1Hospital for Sick Children, Toronto, Ontario, Canada. simonthomas@doctors.org.uk
Insights
This study on developmental hip dislocation treatment shows a 54% hip survival rate at 45 years. Two-thirds of surviving hips show excellent long-term outcomes, indicating the procedure
Area of Science:
- Orthopedic Surgery
- Pediatric Orthopedics
- Hip Dysplasia Research
Background:
- Study reviews long-term outcomes of developmental dysplasia of the hip (DDH) treated with open reduction, capsulorrhaphy, and innominate osteotomy.
- Patients were aged 1.5-5 years at surgery between 1958-1965.
Purpose of the Study:
- To evaluate the mid-term to long-term outcomes of late-presenting DDH treated surgically.
- Assess hip survival, functional scores, and radiographic evidence of osteoarthritis into middle age.
Main Methods:
- Follow-up of 76 patients (101 hips) at 40-48 years post-surgery.
- Assessment included WOMAC and Oxford hip scores, physical exams, and radiographs (minimum joint space width, Kellgren and Lawrence score).
- Kaplan-Meier survival analysis was used with total hip replacement as the endpoint.
Main Results:
- Survival rate at 45 years post-surgery was 54%.
- Average Oxford and WOMAC scores for surviving hips were 16.8 and 16.7, respectively.
- Osteoarthritis (Kellgren and Lawrence grade 3-4) was present in 15/51 hips; bilateral involvement increased failure risk.
Conclusions:
- The surgical technique provides a 54% hip survival rate at 45 years.
- Approximately two-thirds of surviving hips demonstrate excellent prognosis based on radiographic criteria (Kellgren and Lawrence score) at 40-48 years post-procedure.
Background:
A consecutive series of seventy-six patients (101 hips) underwent primary open reduction, capsulorrhaphy, and innominate osteotomy for late-presenting developmental dislocation of the hip. They were between 1.5 and five years old at the time of surgery, which was done between 1958 and 1965. The present study was designed to review the outcome of these patients into middle age.
Methods:
We located and reviewed the cases of sixty patients (eighty hips), which represents a 79% rate of follow-up at forty to forty-eight years postoperatively. Nineteen patients (twenty-four hips) had undergone total hip replacement, and three (three hips) had died of unrelated causes. The remaining thirty-eight patients (fifty-three hips) were assessed by the WOMAC (Western Ontario and McMaster Universities Osteoarthritis Index) and Oxford hip score questionnaires, physical examination, and a standing anteroposterior pelvic radiograph. The radiographs were analyzed to determine the minimum joint space width and the Kellgren and Lawrence score. Accepted indices of hip dysplasia were measured.
Results:
With use of Kaplan-Meier survival analysis and with the end point defined as total hip replacement, the survival rates at thirty, forty, and forty-five years after the reduction were 99% (95% confidence interval, +/-2.4%), 86% (95% confidence interval, +/-6.9%), and 54% (95% confidence interval, +/-16.4%), respectively. The average Oxford hip score and WOMAC score for the surviving hips were 16.8 (range, 0 to 82) and 16.7 (range, 0 to 71), respectively. Of the fifty-one hips for which radiographs were available, thirty-eight demonstrated a minimum joint space width of >2.0 mm and thirteen demonstrated definite osteoarthritis on the basis of this criterion. Osteoarthritis, according to the system of Kellgren and Lawrence, was grade 0 or 1 in twenty-nine hips, grade 2 in seven hips, and grade 3 or 4 in fifteen hips. The average center-edge and acetabular angles were 40 degrees (range, 0 degrees to 61 degrees ) and 32 degrees (range, 20 degrees to 43 degrees ), respectively. With the numbers studied, no significant association was detected between outcome and the modifiable risk factors of body mass index or age at the time of surgery. Hips in patients with bilateral involvement were at significantly greater risk of failure (p = 0.02).
Conclusions:
This method of treatment achieves a 54% rate of survival of the hip at forty-five years. Two-thirds of the surviving hips have an excellent prognosis forty to forty-eight years after the index procedure according to the Kellgren and Lawrence score.
