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14 May 2020 : Clinical Research  

The Comparative Analysis of Antegrade Versus Retrograde Approach for a Failed Porous Tantalum Rod Removal During Conversion to Total Hip Arthroplasty

Fengchao Zhao1AB*, Li Zheng2D, Qi Cheng3E, Weifan Hu2C, Bailiang Wang4DFG

DOI: 10.12659/MSM.921459

Med Sci Monit 2020; 26:e921459

Abstract

BACKGROUND: The failure of porous tantalum rods applied to patients with osteonecrosis of the femoral head (ONFH) has been increasingly reported during the last few years. Very few studies have reported methods for implant removal. This study aimed at comparing 2 procedures used for the removal of a failed tantalum rod during conversion to total hip arthroplasty (THA).

MATERIAL AND METHODS: A total of 65 patients (65 hips), who underwent THA after failed implantation of a tantalum rod between June 2007 and December 2016, were retrospectively evaluated. These patients were classified into 2 groups depending on whether the antegrade approach (removal of the tantalum rod from the tip to the butt at the lateral femoral cortex, n=27) or retrograde approach (removal of the tantalum rod from the butt at the lateral femoral cortex to the proximal tip, n=38) was used for rod extraction. These 2 groups were compared for incision length, operation time, blood loss, fracture, tantalum debris, Harris hip scores, and the presence of osteolysis and/or radiolucency.

RESULTS: These 2 groups did not present any significant differences in terms of Harris hip score and incision length. However, the operation time (P=0.000), blood loss (P=0.000), amount of tantalum debris (P=0.000), and presence of radiolucency (P=0.046) were greater for the retrograde approach than for the antegrade approach.

CONCLUSIONS: The risk of conversion to THA following failed tantalum rod implantation is high. In such cases, the antegrade procedure was found to be a simple and efficient method for removing the trabecular metal rod with the use of a trephine.

Keywords: Arthroplasty, Replacement, Hip, Hip, Tantalum, Decompression, Surgical, Device Removal, Femur Head Necrosis, Reoperation

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750