Samo K Fokter1, Jan Zajc2, Matjaž Merc3. 1. Department for Orthopaedic Surgery, University Medical Centre Maribor, 5 Ljubljanska Street, SLO-2000, Maribor, Slovenia. samo.fokter@guest.arnes.si. 2. Faculty of Medicine, University of Maribor, 8 Taborska Street, SLO-2000 Maribor, Slovenia. 3. Department for Orthopaedic Surgery, University Medical Centre Maribor, 5 Ljubljanska Street, SLO-2000, Maribor, Slovenia.
Abstract
INTRODUCTION: Revision of a well-fixed stem due to unexpected modular neck fracture is a catastrophe for the patient and a challenge for the surgeon. This study aimed to test the possibility of predicting interchangeable neck fracture from serum levels of the stem/neck alloy-consisting metals. MATERIALS AND METHODS: Nineteen patients at high risk for interchangeable neck fracture were randomly selected out of a cohort of 680 bimodular stems made from Ti6Al4V alloy. Serum levels of titanium, aluminium and vanadium were determined. Nine age- and gender-matched patients were used as controls. RESULTS: Mean serum levels of Ti were 6.04 ± 2.52 μg/L, of Al 3.89 ± 1.68 μg/L and of V 0.07 ± 0.04 μg/L in the high-risk group, and 8.22 ± 4.74 μg/L, 4.99 ± 3.98 μg/L and 0.27 ± 0.44 μg/L in the low-risk group, respectively. No statistically significant differences were found between the groups. DISCUSSION: Interchangeable neck fracture of bimodular femoral stems cannot be predicted from serum trace element analysis.
INTRODUCTION: Revision of a well-fixed stem due to unexpected modular neck fracture is a catastrophe for the patient and a challenge for the surgeon. This study aimed to test the possibility of predicting interchangeable neck fracture from serum levels of the stem/neck alloy-consisting metals. MATERIALS AND METHODS: Nineteen patients at high risk for interchangeable neck fracture were randomly selected out of a cohort of 680 bimodular stems made from Ti6Al4V alloy. Serum levels of titanium, aluminium and vanadium were determined. Nine age- and gender-matched patients were used as controls. RESULTS: Mean serum levels of Ti were 6.04 ± 2.52 μg/L, of Al 3.89 ± 1.68 μg/L and of V 0.07 ± 0.04 μg/L in the high-risk group, and 8.22 ± 4.74 μg/L, 4.99 ± 3.98 μg/L and 0.27 ± 0.44 μg/L in the low-risk group, respectively. No statistically significant differences were found between the groups. DISCUSSION: Interchangeable neck fracture of bimodular femoral stems cannot be predicted from serum trace element analysis.
Entities:
Keywords:
Bimodular femoral stem; Component breakage; Hip arthroplasty; Interchangeable neck
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