Relationship Between Quantec Measurement and Cobb Angle in Patients with Idiopathic Scoliosis

Thometz, John; Lamdan, Ron; Liu, X C; Lyon, R

doi:10.1097/01241398-200007000-00017

Cited by 42 publications

(36 citation statements)

References 8 publications

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“…Between each acquisition, the subject relaxed at least half a minute before the second arm posture or repositioning. Two postures for surface acquisition were tested: (A) The posture similar to the anatomical posture adopted by clinicians and by many other researchers [5,25,27] with the arms in slight abduction by the side (Fig. 1a).…”

Section: Acquisition Protocolmentioning

confidence: 99%

“…Several methods to quantify the scoliotic deformity from back or trunk surface asymmetry have been introduced since the 1970s: Moiré contour topography [17,32], raster systems such as the ISIS [26,[28][29][30][31] or the Quantec scanner [5,16,27]. The value of quantifying not only the back surface but also the 360°deformity of the entire scoliotic trunk has also been investigated [2,7,10,11,20,23].…”

Section: Introductionmentioning

confidence: 99%

“…From the viewpoint of correlating the bone structure deformity and the surface asymmetry, an obvious choice is to adopt the same posture as the one used for X-rays, with the arms roll up to the clavicles (''clavicle'' position) [9]. To combine technical constraints, such as minimizing the occlusion of camera fields, another choice is a natural positioning of patients, using the traditional standing anatomical posture adopted by clinicians and by many other researchers [1,5,27].…”

Section: Introductionmentioning

confidence: 99%

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Reliability of trunk shape measurements based on 3-D surface reconstructions

et al. 2007

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This study aimed to estimate the reliability of 3-D trunk surface measurements for the characterization of external asymmetry associated with scoliosis. Repeated trunk surface acquisitions using the Inspeck system (Inspeck Inc., Montreal, Canada), with two different postures A (anatomical position) and B (''clavicle'' position), were obtained from patients attending a scoliosis clinic. For each acquisition, a 3-D model of the patient's trunk was built and a series of measurements was computed. For each measure and posture, intraclass correlation coefficients (ICC) were obtained using a bivariate analysis of variance, and the smallest detectable difference was calculated. For posture A, reliability was fair to excellent with ICC from 0.91 to 0.99 (0.85 to 0.99 for the lower bound of the 95% confidence interval). For posture B, the ICC was 0.85 to 0.98 (0.74 to 0.99 for the lower bound of the 95% confidence interval). The smallest statistically significant differences for the maximal back surface rotation was 2.5 and 1.5°for the maximal trunk rotation. Apparent global asymmetry and axial trunk rotation indices were relatively robust to changes in arm posture, both in terms of mean values and withinsubject variations, and also showed a good reliability. Computing measurements from cross-sectional analysis enabled a reduction in errors compared to the measurements based on markers' position.Although not yet sensitive enough to detect small changes for monitoring of curve natural progression, trunk surface analysis can help to document the external asymmetry associated with different types of spinal curves as well as the cosmetic improvement obtained after surgical interventions. The anatomical posture is slightly more reliable as it allows a better coverage of the trunk surface by the digitizing system.

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Section: Acquisition Protocolmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reliability of trunk shape measurements based on 3-D surface reconstructions

et al. 2007

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“…Therefore, it would be useful to have an objective quantitative tool to evaluate and document the three-dimensional postoperative correction of the trunk external asymmetry. In this perspective, several methods to quantify scoliosis deformity from back or trunk surface asymmetry have been introduced since the 1970s [3,[6][7][8][9][10][11]. Our research team has for several years utilized non-invasive surface topography to acquire the whole trunk of patients at the Sainte-Justine University Hospital Center (CHU) scoliosis clinic in Montréal, Canada [12].…”

Section: Introductionmentioning

confidence: 99%

Multimodal image fusion of anatomical structures for diagnosis, therapy planning and assistance

Cheriet

2013

2013 8th International Workshop on Systems, Signal Processing and Their Applications (WoSSPA)

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“…For the kinematic assessment of posture and movement, imagebased methods such as photogrammetry [3][4][5][6] , optoelectric analysis [7][8][9] , and video analysis [10][11][12][13] are standard methods; however, these are difficult to use clinically, since the set-up and operation of these measurement devices is complicated and time-consuming. Therefore, kinematic assessment is limited to laboratory settings 14) .…”

Section: Introductionmentioning

confidence: 99%

Validity and Reliability of the Kinematic Analysis of Trunk and Pelvis Movements Measured by Smartphones during Walking

et al. 2013

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Abstract.[Purpose] The purpose of this study was to investigate the reliability and validity of the kinematic analysis of trunk and pelvis movement during gait and standing as measured by two smartphones (in the present study, we used iPod touches because of their weight).[Methods] Thirty-eight healthy adults (mean age, 21.4 ± 1.2 years) were instructed to stand and walk on a treadmill at three different speeds. The tilt angle of the trunk and pelvis were measured using both an iPod touch and an optoelectronic motion capture system (Optotrak).[Results] The error between the iPod touch and Optotrak was small during standing and walking at low speed. However, as the walking speed was increased, the error between the iPod touch and Optotrak increased. There were no significant differences between the test and retest measurement values of each device, nor were there any significant differences between the days of the analyses.[Conclusions] The iPod touch has good accuracy, since the variations in the test and retest and for different days were small. This suggests that the iPod touch can be used instead of the Optotrak for the kinematic analysis of trunk and pelvis movement at low walking speeds.

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Relationship Between Quantec Measurement and Cobb Angle in Patients with Idiopathic Scoliosis

Cited by 42 publications

References 8 publications

Reliability of trunk shape measurements based on 3-D surface reconstructions

Reliability of trunk shape measurements based on 3-D surface reconstructions

Multimodal image fusion of anatomical structures for diagnosis, therapy planning and assistance

Validity and Reliability of the Kinematic Analysis of Trunk and Pelvis Movements Measured by Smartphones during Walking

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