Abstract
Introduction
Periacetabular osteotomy has been described as an effective way of treating symptomatic hip dysplasia. We describe a new minimally invasive technique using a modification of the Smith Peterson approach.
Patients/Materials & Methods
189 consecutive patients operated on between March 2010 and March 2013 were included in the study. Patients who had undergone previous pelvic surgery for DDH were excluded. There were 174 females and 15 males. The mean age was 31 years (15–56) and the mean duration of follow-up was 29 months (14 – 53 months). 90% of cases were Tonnis grade 0 or 1. Twenty-three patients were operated on for primary acetabular retroversion. Functional outcomes were assessed using the NAHS, UCLA and Tegner activity scores.
The surgical procedure is performed through an 8–10 cm skin crease incision; a soft tissue sleeve is elevated from the anterior superior iliac spine. The interval medial to the rectus femoris is developed. The hip joint is not opened and fixation of the osteotomy was with three 4.5mm cortical screws. A cell saver was routinely used.
Results
For the dysplasia group the mean pre-operative lateral centre edge angle was 14.2degrees (−5degrees to 30degrees) and the mean acetabular index was 18.4degrees (4degrees to 40degrees). Post-operatively these were 31degrees (18degrees to 46degrees) and 3degrees (−7degrees to 29degrees) respectively. An allogenic blood transfusion was required in 3 patients (1.5%). The mean duration of surgery was 105 minutes. There were no major nerve or vascular complications and no wound infections. At the time of last follow-up, we noted a significant improvement in functional outcome scores: UCLA improved by 2.31 points, Tegner improved by 1.08 points, and the NAHS improved by 25.4 points.
Conclusion
We have found this approach to be safe and effective, facilitating early recovery from surgery.
