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. 2018 Jan 16;15(1):134-137.
doi: 10.1016/j.jor.2018.01.008. eCollection 2018 Mar.

Effect of stem alignment on long-term outcomes of total hip arthroplasty with cementless Bi-Metric femoral components

Takaaki Shishido  1 , Toshiyuki Tateiwa  1 , Yasuhito Takahashi  1   2 , Toshinori Masaoka  1 , Tsunehito Ishida  1 , Kengo Yamamoto  1
Affiliations

Effect of stem alignment on long-term outcomes of total hip arthroplasty with cementless Bi-Metric femoral components

Takaaki Shishido et al. J Orthop. .

Abstract

We investigated the effects of varus-valgus alignment on the long-term outcomes after cementless total hip arthroplasty (THA) using a porous coated version of Bi-Metric® femoral stems. The Kaplan-Meier survival analysis was performed in 71 hips. The survival rate with femoral revision for aseptic loosening as the end point was 100% at 17 years. Nevertheless, the initial stem alignment was more valgus in patients with the Engh grade III-IV stress shielding than patients with the Engh grade I-II. Our results suggest that valgus misalignment of cementless Bi-Metric stem might be a potential risk factor for the progression of stress shielding.

Keywords: Cementless THA; Femoral stem; Stem alignment; Stress shielding; Survival rate.

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Figures

Fig. 1
Fig. 1
Kaplan-Meier survival curves for cementless Bi-Metric femoral components at a mean of 14 years.
Fig. 2
Fig. 2
Relationship between number (percentage) of the hips and the initial stem alignment.
Fig. 3
Fig. 3
Relationship between number (percentage) of the hips and the stress shielding grades defined by Engh et al. [13].
Fig. 4
Fig. 4
Relationship between the initial stem alignment and the stress shielding grades defined by Engh et al. [13].
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