ArticleThe British journal of radiology2023
Ultra-low-dose CT is feasible for torsion measurement of the lower limb in patients with metal implants.
Article in The British journal of radiology, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed, 4 citations in OpenAlex.
- Tin-filtered ultra-low-dose CT for lower limb torsion measurements in children and adolescents: a prospective study.Skeletal radiology · 2026Article
- Determining the Origin of Deformity in Torsional Femoral Pathology: A Narrative Review and an Illustrative Pilot Study of a Novel Methodology.Journal of clinical medicine · 2025Review
- Radiological assessment of lower limb torsional deformities: a narrative review.Annals of joint · 2025Review
- MRI-based torsion measurement of the lower limb is a reliable and valid alternative for CT measurement: a prospective study.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2023Article
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Authors and funding
3 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectivesPatients who need torsion measurement of the lower limb often have metal implants hindering
methodsWe retrospectively included all patients with clinically indicated torsion measurement in the period July 2019 to June 2021 and metal implants in the scanning field. The ULD-CT protocol comprised automated tube current time product and automated tube voltage with reference settings of 100kV/20mAs (hip), 80kV/20mAs (knee) and 80kV/10mAs (ankle). Femoral neck anteversion, tibial, intra-articular knee and overall leg torsion measurements were performed by two radiologists independently. Diagnostic confidence regarding the delineation of the relevant cortical bone was rated on a 5-point Likert scale (1 = non-diagnostic, 5 = excellent).
results102 consecutive patients could be included (BMI 27.38 ± 5.85) with 154 metal implants. Median total dose length product of the ULD-CT-torsion measurement was 16.5mGycm [11-39]. Both readers showed high agreement with a maximum torsional difference of 4.1°. Diagnostic confidence was rated best (5/5) in 92.2% (reader 1) and 93.1% (reader 2) with a worst rating of 3/5.
conclusionThe new ULD-CT protocol is feasible for torsion measurement of the lower limb - even in patients with metal implants. ADVANCES IN KNOWLEDGE: Metal implants are not an obstacle for ULD-CT torsion measurements of the lower limb.
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