Geometrical values of the normal and arthritic hip and knee detected with the EOS imaging system

Than, Péter; Szuper, Kinga; Somoskeőy, Szabolcs; Warta, Vilmos; Illés, Tamás

doi:10.1007/s00264-011-1403-7

Cited by 61 publications

(44 citation statements)

References 17 publications

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“…Stratified by pincer size, rotation, and tilt, the intermodality ICCs showed excellent reliability between EOS 1 and conventional radiography in morphologic features of the pincer. Our study also is consistent with previous EOS 1 imaging studies, which all showed an image quality of EOS 1 comparable to improved compared with that of conventional radiography [1,6,17,18,20,24,31]. However, we did see relative horizontal widening of the image in EOS 1 with extreme anterior tilt (C 10°) and horizontal narrowing in extreme posterior tilt (C 10°) owing to the decrease or increase in distance between the x-ray beam and the pelvis (Fig.…”

Section: Discussionsupporting

confidence: 92%

“…EOS 1 imaging uses a slot scanner that creates a horizontal fan beam and then physically moves vertically to capture the designated body part [6] as opposed to conventional radiography which uses a fixed cone beam [3]. Radiation doses of EOS 1 have been reported as eight to 10 times less than conventional radiography and 800 to 1000 times less than CT [15,20,31]. A couple studies have validated the use and reliability of EOS 1 in imaging of the hip and lower extremities [18,31].…”

Section: Introductionmentioning

confidence: 99%

“…Radiation doses of EOS 1 have been reported as eight to 10 times less than conventional radiography and 800 to 1000 times less than CT [15,20,31]. A couple studies have validated the use and reliability of EOS 1 in imaging of the hip and lower extremities [18,31]. At this time, we are unaware of any studies showing the ability of EOS 1 to reliably measure established hip parameters in morphologic pincer features at varying degrees of tilt and rotation [27].…”

Section: Introductionmentioning

confidence: 99%

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Reliability of Overcoverage Parameters With Varying Morphologic Pincer Features: Comparison of EOS® and Radiography

Monazzam¹,

Agashe²,

Hosalkar³

2013

Clinical Orthopaedics &Amp; Related Research

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Background Multiple radiographic parameters used for diagnosis and quantification of morphologic pincer features have emerged, but the degree to which pelvic tilt or rotation affects conventional radiography and EOS 1 is unknown. Question/purposes We asked: (1) What is the reliability of EOS 1 and conventional radiography at increasing sizes of morphologic pincer features with varying degrees of tilt and rotation? (2) What is the effect of tilt and rotation on acetabular overcoverage measurements? Methods Using a dry cadaveric pelvis, AP conventional radiographs and EOS 1 images were taken at intervals of increasing modeled pincer size with 0°to 15°varying tilt and rotation. Lateral center-edge angle, Sharp angle, Tönnis angle, crossover sign, and retroversion index were measured on all images. Statistical analysis was conducted. Results The intermodality intraclass correlation coefficients for conventional radiography and EOS 1 radiography across all pincer sizes, rotations, and tilts were excellent (0.93-0.98). Crossover sign was in perfect agreement in conventional radiography and EOS 1 . Rotation of the hip away from the beam source and/or increased anterior tilt falsely increased all overcoverage parameters except for Tönnis angle. Rotation away from the beam of 10°or greater or anterior tilt of 5°or greater produced a false-positive crossover sign. Conclusions EOS 1 radiography maintained excellent reliability in comparison to conventional radiography but both were equally vulnerable to the effects of tilt and rotation for quantification of hip parameters used in acetabular overcoverage assessment. A standardized pelvic radiograph ensuring that the pelvis is not excessively tilted or rotated should be used for assessing acetabular overcoverage parameters.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reliability of Overcoverage Parameters With Varying Morphologic Pincer Features: Comparison of EOS® and Radiography

Monazzam¹,

Agashe²,

Hosalkar³

2013

Clinical Orthopaedics &Amp; Related Research

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“…To the authors' knowledge, only three studies have quantified morphological parameters in non-OA and OA subjects in the standing position (Okuda et al, 2007;Than et al, 2012;Yoshimoto et al, 2005); however each has limitations. In the first study, the non-OA group had low back pain and only the sagittal-plane pelvic parameters were evaluated; in the second study, the OA group consisted only of females with hip OA secondary to acetabular dysplasia and again only the 2D pelvic parameters were evaluated; and in the third study only the lower limb parameters were evaluated.…”

Section: Introductionmentioning

confidence: 97%

Healthy vs. osteoarthritic hips: A comparison of hip, pelvis and femoral parameters and relationships using the EOS® system

Bendaya

Lazennec

Anglin

et al. 2015

Clinical Biomechanics

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Differences between the groups suggest either degenerative changes over time or inherent differences between individuals that may contribute to the disease progression. These data provide a basis for longitudinal and post-surgery studies. Due to the considerable variability amongst individuals and the considerable overlap between groups, patients should be evaluated individually and at multiple joints when planning hip, knee and spine surgery.

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“…7) [12]. Horizontal plane rotational aspects of the whole skeletal system are readily visualised and evaluated in top-view images.…”

Section: Introductionmentioning

confidence: 99%

The EOS™ imaging system and its uses in daily orthopaedic practice

Illés

Somoskeőy

2012

International Orthopaedics (SICOT)

Self Cite

185

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Background The EOS™ X-ray machine, based on a Nobel prize-winning invention in physics in the field of particle detection, is capable of a simultaneous capture of biplanar X-ray images by slot scanning of the whole body in an upright, physiological load-bearing position, using ultralow radiation doses. The simultaneous capture of spatially calibrated anterioposterior and lateral images provides a three-dimensional (3D) surface reconstruction of the skeletal system using a special software. Parts of the skeletal system in X-ray images and 3D-reconstructed models appear in true 1:1 scale for size and volume, thus spinal and vertebral parameters, lower limb axis lengths and angles, as well as any relevant clinical parameters in orthopaedic practice can be very precisely measured and calculated. Visualisation of 3D reconstructed models in various views by sterEOS 3D software enables presentation of top view images to help analyse rotational conditions of lower limbs, joints and spine deformities in the horizontal plane, providing revolutionary novel possibilities in orthopaedic surgery, especially in spine surgery. Approach and conclusions Our department has been extensively using the very first commercially available EOS™ imaging system worldwide for routine orthopaedic diagnostics since June 2007. During this period of about 4.5 years, more than 5,700 standard examinations have been carried out, about a third of them in spine deformity cases and the rest in lower limb orthopaedic cases. In this mini-review, general principles and uses of this groundbreaking integrated orthopaedic solution is reviewed with a few highlighted examples from our own clinical practice.

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Geometrical values of the normal and arthritic hip and knee detected with the EOS imaging system

Abstract: EOS 2D/3D with its sterEOS 3D reconstruction is useful for a comprehensive 3D examination of the lower limb. In the near future it may be suitable for daily routine diagnostics of orthopedic lower limb deformities as a primary examination method.

Cited by 61 publications

References 17 publications

Reliability of Overcoverage Parameters With Varying Morphologic Pincer Features: Comparison of EOS® and Radiography

Reliability of Overcoverage Parameters With Varying Morphologic Pincer Features: Comparison of EOS® and Radiography

Healthy vs. osteoarthritic hips: A comparison of hip, pelvis and femoral parameters and relationships using the EOS® system

The EOS™ imaging system and its uses in daily orthopaedic practice

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