ArticleArchives of orthopaedic and trauma surgery2023
The influence of stem alignment on the bone mineral density around the Polarstem following total hip arthroplasty.
Article in Archives of orthopaedic and trauma surgery, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- Comparison of Short-Term Results of Total Hip Arthroplasty with Polarstem by Dorr Type.Indian journal of orthopaedics · 2025Article
- Impact of femoral stem alignment on periprosthetic bone density in THA: a study of the Avenir Complete stem.Archives of orthopaedic and trauma surgery · 2024Article
- Review
- The assessment of canal flare index and proximal femoral bone density can improve stem selection for peri-prosthetic bone maintenance after total hip arthroplasty.Archives of orthopaedic and trauma surgery · 2024Article
- Bone mineral density around cementless short stems after reverse shoulder arthroplasty: changes over time and its relationship to stem positioning.JSES international · 2024Article
- Accuracy comparison of cup positioning during total hip arthroplasty using Hip Align and AR-Hip in the supine position.Archives of orthopaedic and trauma surgery · 2023Article
- Effect of implant composition on periprosthetic bone mineral density after total hip arthroplasty.Archives of orthopaedic and trauma surgery · 2023Article
- [Physiological reactions in the interface between cementless implants and bone].Orthopadie (Heidelberg, Germany) · 2023Review
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Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
introductionBone mineral density is important in detecting implant loosening after total hip arthroplasty. The Polarstem can improve postoperative bone mineral density changes, but no information exists on the influence of postoperative stem alignment. Therefore, we investigated the relationship between bone mineral density change and stem alignment following total hip arthroplasty using a cementless Polarstem. MATERIALS AND
methodsThis retrospective study included 42 patients (50 hips) who underwent total hip arthroplasty using a cementless Polarstem. Bone mineral density around the stem was measured according to the established Gruen zone classification using dual-energy X-ray absorptiometry. Measurements were performed 2 months postoperatively (baseline) and 6, 12, 18, and 24 months postoperatively. Bone mineral density changes at each follow-up were calculated as (bone mineral density at follow-up/at 2 weeks) × 100 (%). The stem varus, anterior tilt, and anteversion angles were measured using computed tomography. The correlation coefficient between bone mineral density changes and stem alignment were investigated.
resultsThe 24-month postoperative bone mineral density increased in zones 4 (106.0%) and 5 (107.3%) and decreased in zones 1 (89.6%) and 7 (90.6%). The mean stem varus angle, anterior tilt, and anteversion error were - 0.3° ± 1.8°, 1.9° ± 2.2°, and 6.8° ± 5.4°. Negative correlations were observed between the stem varus angle and 24-month postoperative bone mineral density change in zone 1 (r = - 0.34, p = 0.02), and the stem anteversion error and 24-month postoperative bone mineral density change in zone 1 (r = - 0.48, p < 0.01) and zone 7 (r = - 0.31, p = 0.03).
conclusionsThe cementless Polarstem may have a positive effect on postoperative bone mineral density in the distal femur. However, varus malalignment and anteversion error of the stem could have a negative influence on the bone mineral density changes in the proximal femur.
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