PedCAT for 3D-imaging in standing position allows for more accurate bone position (angle) measurement than radiographs or CT

Richter, Martinus; Seidl, Bernd; Zech, Stefan; Hahn, Sarah

doi:10.1016/j.fas.2014.04.004

Cited by 178 publications

(160 citation statements)

References 10 publications

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“…This is concurrent with previous literature in which Richter et al 35 stated that WBCT imaging is a more accurate method of measuring angles because it is not subject to rotation and projection bias and because it is weightbearing. Our technique's purpose was to limit the drawbacks of 2D measurement relating to rotational, projectional and operative issues.…”

Section: Discussionsupporting

confidence: 78%

“…3D weightbearing computed tomography (3D WBCT) provides an opportunity to solve the problems associated with 2D biometrics. 16,35 This could be done by creating a new generation of HFA measures or 3D biometrics based on 3D coordinates rather than trying to forceapply older HFA measurements based on 2D angles to this new 3D environment. The ideal criteria for this new kind of…”

Section: Introductionmentioning

confidence: 99%

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3D Biometrics for Hindfoot Alignment Using Weightbearing CT

Lintz

Welck

Bernasconi³

et al. 2017

Foot Ankle Int.

139

162

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Background: Hindfoot alignment on 2D radiographs can present anatomical and operator-related bias. In this study, software designed for weightbearing computed tomography (WBCT) was used to calculate a new 3D biometric tool: the Foot and Ankle Offset (FAO). We described the distribution of FAO in a series of data sets from clinically normal, varus, and valgus cases, hypothesizing that FAO values would be significantly different in the 3 groups. Methods: In this retrospective cohort study, 135 data sets (57 normal, 38 varus, 40 valgus) from WBCT (PedCAT; CurveBeam LLC, Warrington, PA) were obtained from a specialized foot and ankle unit. 3D coordinates of specific anatomical landmarks (weightbearing points of the calcaneus, of the first and fifth metatarsal heads and the highest and centermost point on the talar dome) were collected. These data were processed with the TALAS system (CurveBeam), which resulted in an FAO value for each case. Intraobserver and interobserver reliability were also assessed. Results: In normal cases, the mean value for FAO was 2.3% ± 2.9%, whereas in varus and valgus cases, the mean was −11.6% ± 6.9% and 11.4% ± 5.7%, respectively, with a statistically significant difference among groups (P < .001). The distribution of the normal population was Gaussian. The inter-and intraobserver reliability were 0.99 +/-0.00 and 0.97 +/-0.02 Conclusions: This pilot study suggests that the FAO is an efficient tool for measuring hindfoot alignment using WBCT. Previously published research in this field has looked at WBCT by adapting 2D biometrics. The present study introduces the concept of 3D biometrics and describes an efficient, semiautomatic tool for measuring hindfoot alignment. Level of Evidence: Level III, retrospective comparative study.

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Section: Discussionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

3D Biometrics for Hindfoot Alignment Using Weightbearing CT

Lintz

Welck

Bernasconi³

et al. 2017

Foot Ankle Int.

139

162

View full text Add to dashboard Cite

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“…Radiographs and CT or PedCAT were obtained as follows (Fig. 2a-i) [15]: radiographs (bilateral dorsoplantar and lateral views of the entire foot) with full weight bearing (if possible due to the general condition of the patient) were obtained during the entire clinical course (pre-operatively ( Fig. 2a and b), post-operatively, at 6 weeks, 12 weeks, 6 months, 12 months, and 24 months ( Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Talo-1st metatarsal angle -dorsoplantar À128 and lateral À2.78, calcaneo-5th metatarsal angle 163.78. (h and i) PedCAT images (3D-imaging with weight bearing) at 1 year-follow-up[15].…”

mentioning

confidence: 99%

Intramedullary fixation in severe Charcot osteo-neuroarthropathy with foot deformity results in adequate correction without loss of correction – Results from a multi-centre study

Richter¹,

Mittlmeier

Rammelt

et al. 2015

Foot and Ankle Surgery

Self Cite

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Realignment and fixation with MFB in severe CN result in adequate correction with minimal loss of correction in the observed clinical course. The non-union rate was lower than previously reported. Stable fixation with MFB is a valuable treatment option for CN with minimal loss of correction and high union rates. The use of a minimum of two bolts is recommended to avoid recurrent deformity. Clinical Trials.gov: NCT01770639.

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“…However, a clinical observation at the radiology departments in multiple centers in the Netherlands showed that the posture of the patient was highly variable when radiographing the foot according to the already mentioned criteria. This could be a possible explanation for the discrepancy between clinical findings and the appearance on X-ray, which was also mentioned in the literature [16,23]. Therefore, the purpose of the present study was to evaluate the effect of standing posture on the osseous relationships of the foot.…”

Section: Introductionmentioning

confidence: 80%