Abstract
Purpose
The purpose of this study is to know the peri-operative morbidity, clinical and radiographical outcomes of conversion THA from failed transtrochanter rotational osteotomy (TRO).
Patients and methods
From 2003 January to 2009 January, there were 18 hips(18 patients) who underwent conversion THA from TRO for osteonecrosis of the femoral head (ONFH) (Group I). The mean duration from TRO to conversion THA was 2.6 years. We made a matched control group of 18 primary THA for ONFH (Group II) and we evaluated perioperative morbidity and complications in each group. For the clinical evaluation, we checked Harris hip score (HHS) and WOMAC score. For the radiographical evaluation, we evaluated implant position, stability and osteolysis.
Results
There was no significant differences in operation time, blood loss, hospital stay between two groups. In clinical results, there was no significant difference in postoperative HHS (p=0.986), but there was significant difference in postoperative WOMAC score. There was more significant postoperative internal rotation limitation in the Group II (p<0.001). In radiographical evaluation, there was no significant difference between two groups, except the preoperative leg length discrepancy (p=0.015)
Conclusion
According to our study, there was no significant difference between conversion THA after TRO and primary THA in terms of perioperative morbidity and radiographical out come. But primary THA showed better postoperative internal rotation and better WOMAC score than conversion THA after previous TRO for ONFH.
