ArticleActa orthopaedica2020
The anatomical SP-CL stem demonstrates a non-progressing migration pattern in the first year: a low dose CT-based migration study in 20 patients.
Article in Acta orthopaedica, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers, 1 of them a synthesis that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
17 citing papers in PubMed, 1 synthesis or guideline pooled it.
- The accuracy and precision of CT-RSA in arthroplasty: a systematic review and meta-analysis.Acta orthopaedica · 2025Pooled it
- Similar outcome with a new anteverted or a straight standard stem: a randomized study of 72 total hip arthroplasties evaluated with clinical variables, radiostereometry, and DXA up to 2 years.Acta orthopaedica · 2022Trial
- Synthetic Implant Migration Generation for Accuracy and Precision Evaluation of AI-Based CT-RSA in Total Hip Arthroplasty.Diagnostics (Basel, Switzerland) · 2026Article
- Inducible displacement CT for implant loosening detection: a scoping review on methods, validation, and challenges.Acta orthopaedica · 2026Article
- Precision, Accuracy, and Observer Reliability of Computed Tomography-Based Radiostereometric Analysis in Measuring Femoral Stem Migration In Vitro.Journal of orthopaedic research : official publication of the Orthopaedic Research Society · 2026Article
- Evaluation of migration analysis with AI-based CT-RSA and preoperative 3D-planning in total hip arthroplasty.Acta orthopaedica · 2025Article
- Precision evaluation of 2 CT-based radiostereometric analysis systems in a cadaver study.Acta orthopaedica · 2025Article
- Comparison of Marker-Based RSA and CT-RSA for Analyzing Micromotions After Distal Radius Osteotomy: A 1-Year Retrospective Study of 24 Patients.Journal of orthopaedic research : official publication of the Orthopaedic Research Society · 2025Article
- Article
- Pre-operative virtual three-dimensional planning for proximal humerus fractures: A proof-of-concept study.Shoulder & elbow · 2024Article
- Comparison between model-based RSA and an AI-based CT-RSA: an accuracy study of 30 patients.Acta orthopaedica · 2024Article
- Load-induced deformation of the tibia and its effect on implant loosening detection.Scientific reports · 2023Article
- CT-based migration analysis is more precise than radiostereometric analysis for tibial implants: a phantom study on a porcine cadaver.Acta orthopaedica · 2023Article
- Precision of low-dose CT-based micromotion analysis technique for the assessment of early acetabular cup migration compared with gold standard RSA: a prospective study of 30 patients up to 1 year.Acta orthopaedica · 2022Article
- Hip prosthetic loosening: A very personal review.World journal of orthopedics · 2021Review
- Precision of CT-based micromotion analysis is comparable to radiostereometry for early migration measurements in cemented acetabular cups.Acta orthopaedica · 2021Article
- "Great balls on fire:" known algorithm with a new instrument?Acta orthopaedica · 2020Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Background and purpose - RSA is the gold standard for evaluation of early implant migration. We report the results of a new CT-based method Sectra CT micromotion analysis (CTMA) applied to assess the migration pattern in 20 patients in the 1st year after surgery, both with and without the use of tantalum beads in the bone. The patients had an SP-CL anatomical stem that uses an S-shape, designed to better fit the curvature of the femur. Patients and methods - 20 THA patients (mean age 61 years, 10 female) received SP-CL stems, tantalum markers in the femur, and low-dose CT scans at 1 day, 3 months and 12 months postoperatively. In addition, precision as well as inter- and intra-observer variability of the 12-month migration was measured. Results - The 3-month subsidence was median 0.5 mm (95% CI 0.3-1.0) and the internal rotation 1.8° (CI 0.9-2.6). At 12 months the corresponding values were 0.6 (CI 0.3-1.6) mm and 1.9° (CI 0.8-2.4). Precision was 0.1 to 0.3 mm and 0.1° to 0.4° at 3 and 12 months. Intra- and inter- observer variability yielded R-values averaging 0.96 and 0.98. Interpretation - The migration mainly took place during the 1st 3 months, in line with other uncemented stems. The number of patients with subsidence over 2 mm in the first year (5) might be due to the design of the prosthesis with an anatomical shape. Alternatively, our results might indicate a challenge when choosing the correct size for these new anatomical stems. CTMA provided precise and highly repeatable measurements of migration without the need for tantalum markers.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.