ArticleArchives of orthopaedic and trauma surgery2026
Accuracy and risk factors for poor cup orientation in total hip arthroplasty: a comparison between supine and lateral registration using a portable navigation system.
Article in Archives of orthopaedic and trauma surgery, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
8 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
introductionAccurate acetabular cup orientation is essential in total hip arthroplasty (THA). Portable inertial navigation may improve reproducibility, but accuracy in lateral decubitus THA may depend on the pelvic registration workflow. We compared cup placement accuracy between supine and lateral registration workflows using NAVBIT (Smith & Nephew PLC) and explored factors associated with large navigation errors. MATERIALS AND
methodsWe retrospectively reviewed 110 consecutive primary cementless THAs performed in the lateral decubitus position using NAVBIT. The supine-registration workflow included 52 hips (supine pelvic registration followed by repositioning), and the lateral-registration workflow included 58 hips (registration and cup implantation in the lateral decubitus position). NAVBIT recorded radiographic inclination (RI) and radiographic anteversion (RA) intraoperatively; postoperative RI and RA were measured via computed tomography. Accuracy was defined as the absolute difference between navigation records and postoperative measurements. We compared navigation accuracy outcomes between propensity score-matched groups. Outliers were defined as an absolute error > 5° in RI or RA; factors associated with outliers were evaluated in the overall cohort.
resultsAfter propensity score matching, 46 matched pairs (n = 92) were analyzed. Postoperative cup orientation was similar between workflows (RI: 40.8°±3.4° vs. 40.3°±4.1°, p = 0.51; RA: 15.2°±3.3° vs. 14.6°±5.9°, p = 0.56). Mean absolute errors were smaller with supine registration for both RI and RA, with a significant reduction for RA (RI: 2.7°±2.3° vs. 3.4°±2.7°, p = 0.24; RA: 2.2°±1.5° vs. 4.1°±3.4°, p < 0.001). Bland-Altman analysis showed narrower limits of agreement with supine registration, particularly for RA. In the overall cohort, lateral registration increased the odds of outlier status (OR 3.11; 95% CI, 1.36-7.09; p = 0.007).
conclusionsFor NAVBIT-assisted THA performed in the lateral decubitus position, standardized supine pelvic registration followed by repositioning reduced absolute navigation errors, particularly for anteversion, compared with lateral registration.
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.