HETEROTOPIC OSSIFICATION FOLLOWING NONCEMENTED HIP REPLACEMENT: A COMPARATIVE STUDY USING MINIMAL INVASIVE SURGERY VS. CONVENTIONAL ANTEROLATERAL APPROACH

Abstract

Background: A conventional anterolateral approach was previously a remedy for total hip replacement. Currently, an intermuscular approach is relatively safe, provides excellent exposure and causes less soft tissue damage than the traditional approach.
 Objective: The study aimed to compare heterotopic ossification (HO) between minimal invasive surgery (MIS) and conventional anterolateral approach among patients having noncemented total hip replacement.
 Methods: A retrospective study was conducted among 47 patients (52 sites) with noncemented total hip replacement who were randomly divided in 2 groups. The first group received treatment with MIS whereas the second group received the conventional anterolateral approach. The incidence of HO was recorded and followed-up for a minimum of 12 months. The demographic data of both groups were analyzed using the chi-square test and the discrete data were analyzed using the chi-square test and Fisher’s exact test.
 Results: The incidence of HO in the MIS and conventional anterolateral approach group were within 37.9 and 56.5%, respectively. After 12 months of followed-up, the incidence of HO in the MIS group did not significantly differ compared with that of the conventional group (p=0.291). Severe HO was within 13.79 and 8.69%, respectively (p=0.682) and neither group required further surgery.
 Conclusion: The MIS group showed a lower incidence of HO than that found in the conventional anterolateral approach group without statistical significance.