Abstract
Purpose
The aim of the current study was to compare the diagnostic precision and reliability of different methods in measuring Hill–Sachs lesions (HSLs) using MRI and CT.
Methods
A total of 80 consecutive patients with a history of anterior shoulder instability were retrospectively included. The preoperative CT and MRI scans of the affected shoulders were analysed. To investigate the ability of the Franceschi grading, Calandra classification, Richards, Hall, and Rowe grading scale, Flatow percentage and “glenoid track” assessment according to Di Giacomo et al. to quantify the extent of humeral bone loss, the results of each measurement method obtained with MRI were compared with those achieved with CT. In addition, the intra- and inter-rater reliabilities of each measurement method using CT and MRI were calculated and compared.
Results
A significant difference was found between CT and MRI in the determination of the Hill–Sachs interval (HSI) (p = 0.016), but not between the results of any of the other measurement techniques. With the exceptions of the Franceschi grade and Calandra classification, all measurement methods showed good or excellent intra- and inter-rater reliabilities for both MRI and CT.
Conclusions
While the determination of the HSI with MRI was more accurate, all other analysed techniques for measuring the amount of humeral bone loss showed similar diagnostic precision. With regard to the intra- and inter-rater reliabilities, all measurement techniques analysed, with the exception of the Franceschi and Calandra classifications, provided good to very good reliabilities with both CT and MRI.
Level of evidence
III
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Sgroi, M., Huzurudin, H., Ludwig, M. et al. With the exception of the Hill–Sachs interval, CT and MRI show no significant differences in the diagnostic value of the HSL measurement regardless of the measurement technique. Knee Surg Sports Traumatol Arthrosc 29, 3981–3988 (2021). https://doi.org/10.1007/s00167-021-06695-5
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DOI: https://doi.org/10.1007/s00167-021-06695-5