ArticleJournal of experimental orthopaedics2026
Measurement of intraarticular tibiofemoral rotation in routine MRI is not reliable: A comparison of knee joints in torsional and routine MRI.
Article in Journal of experimental orthopaedics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Purpose: Intraarticular tibiofemoral (iaTF) rotation at the axial plane of the knee is considered as one parameter of joint alignment. Its measurement is originally described on fully extended legs in torsional computed tomography/magnetic resonance imaging (CT/MRI). The aim of this study was to investigate whether the measurement of iaTF rotation is reliably possible in routine MRIs. Methods: Patients who underwent torsional MRI (torMRI) and routine MRI (rouMRI) of the knee were retrospectively analysed. iaTF rotation corresponds to the angle between a tangent to the dorsal femoral condyles and a tangent to the dorsal tibial plateau in the axial plane (positive values indicating external-/negative values internal rotation). In rouMRI, the flexion angle between the bony axes in the sagittal plane was measured. Spearman correlation coefficient (r Results: 90 cases (78 patients, age 25.6 ± 9.6 years) were included. iaTF rotation was 5.7° ± 6.7° in torMRI and 1.0° ± 8.0° in rouMRI. The measurements differed by an absolute value of 6.4° ± 4.6°. Strong positive correlation ( Conclusion: Intraarticular TF rotation is not reliable measurable on routine MRIs with no uniform protocol, as the results deviate considerably from those in the torsional MRIs. Level of Evidence: Level III.
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