The EOS 3D imaging system reliably measures posterior tibial slope.

Hecker, Andreas; Lerch, Till D.; Egli, Rainer J.; Liechti, Emanuel F.; Klenke, Frank M. (2021). The EOS 3D imaging system reliably measures posterior tibial slope. Journal of orthopaedic surgery and research, 16(1), p. 388. BioMed Central 10.1186/s13018-021-02529-9

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BACKGROUND

One of the values determined during the assessment of knee issues is the posterior tibial slope (PTS). A new option for measuring the PTS is the EOS 3D imaging system, which provides anteroposterior (AP) and lateral long leg radiographs (LLRs) using less radiation than a conventional LLR. We investigated the reliability of the EOS 3D imaging system with respect to PTS measurements.

METHODS

We retrospectively searched our radiological database for patients who underwent an EOS scan and a computed tomography (CT) scan of their lower extremities between January and December 2019. Fifty-six knees were included in the study. Medial and lateral PTSs were determined using both modalities. A radiologist and an orthopaedic surgeon each performed all measurements twice and the intraclass correlation (ICC) was calculated to assess inter- and intrarater reliability. The Student t test and Pearson correlation were used to compare the results of both imaging modalities.

RESULTS

The mean medial PTS was 8.5° (95% confidence interval [CI], 8.1-8.9°) for the EOS system and 7.7° (95% CI, 7.3-8.1°) for CT, and the lateral PTS was 7.4° (95% CI, 6.9-7.9°) for the EOS system, and 7.0° (95% CI, 6.5-7.4°) for CT. Interrater reliability (ICC) with respect to medial and lateral PTSs measured on the EOS (0.880, 0.765) and CT (0.884, 0.887) images was excellent. The intrarater reliability of reader 1 (ICC range, 0.889-0.986) and reader 2 (ICC range, 0.868-0.980) with respect to the same measurements was excellent.

CONCLUSION

The PTS measurements from the EOS 3D imaging system are as reliable and reproducible as those from CT, the current gold standard method. We recommend using this system if possible, because it acquires more information (sagittal plane) in a scan than a conventional LLR, while exposing the patient to less radiation.

LEVEL OF EVIDENCE

Level III, Retrospective cohort study.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Orthopaedic, Plastic and Hand Surgery (DOPH) > Clinic of Orthopaedic Surgery
04 Faculty of Medicine > Department of Radiology, Neuroradiology and Nuclear Medicine (DRNN) > Institute of Diagnostic, Interventional and Paediatric Radiology

UniBE Contributor:

Hecker, Andreas; Lerch, Till; Egli, Rainer Josef; Liechti, Emanuel and Klenke, Frank M.

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1749-799X

Publisher:

BioMed Central

Language:

English

Submitter:

Maria de Fatima Henriques Bernardo

Date Deposited:

29 Jun 2021 14:22

Last Modified:

04 Jul 2021 03:08

Publisher DOI:

10.1186/s13018-021-02529-9

PubMed ID:

34134747

Uncontrolled Keywords:

EOS Long leg radiographs Planning HTO Sagittal lower leg alignment Tibial slope

BORIS DOI:

10.48350/156998

URI:

https://boris.unibe.ch/id/eprint/156998

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