Automated computation of femoral angles in dogs from three-dimensional computed tomography reconstructions: Comparison with manual techniques

Longo, Federico; Nicetto, Tommaso; Banzato, Tommaso; Savio, Gianpaolo; Drigo, Michele; Meneghello, Roberto; Concheri, Gianmaria; Isola, Maurizio

doi:10.1016/j.tvjl.2017.11.014

Cited by 16 publications

(45 citation statements)

References 28 publications

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“…The repeatability and reproducibility of the proposed protocol were assessed and compared with manual measurements made with radiographs and CT reconstructions, finding that the 3D protocol was the most repeatable and reproducible method. 12 This conclusion was, also, supported by the automated design of the 3D protocol, which restricts the potential user-related errors only to the operations required for the creation of the mesh model and, therefore, remarkably decreases the computational time. 11 However, the accuracy of 3D measurements, described as the difference of a measured value from a true value, was not assessed and needed to be investigated.…”

Section: Introductionmentioning

confidence: 90%

“…The first observer isolated with Osirix every anonymized femur by cropping the tibia and pelvis, avoiding unintentional modification of the profiles of the femoral head and condyles. Once the femur model was separated, it was segmented using the procedure described by Longo et al 12 Briefly, using the region of interest (ROI) and 2D/3D growing region software functions, the observer found the mean density femur values, which usually are major than 300 Hounsfield unit (HU) and then set-up the segmentation parameters in a dedicated tool window. As a result, a bitmapped (newly generated imaging series) was created and 3D reconstructed, through surface rendering function.…”

Section: Ct Scansmentioning

confidence: 99%

“…Finally, a 3D stereolithograophic (STL) 13 file was saved and imported in the Rhinoceros platform. 11,12 3D scans STL files were generated from 3D scans to obtain reference models on which compare femoral angles measured on CT. Femurs were disarticulated at coxo-femoral and femoral-tibial joints, dissected free from soft tissues excluding the patella and fabellae and stored in plastic bags at a -20°. A 3D scanner (Cronos 3D dual, Open technologies) was used for the femoral analysis.…”

Section: Ct Scansmentioning

confidence: 99%

“…6,9,10 Recently a 3D Python-based algorithm run on a computer-aided-design (CAD) software (Rhinoceros version 5, Robert McNeell & Associates) was presented as a novel methodology for the computation of femoral angles in the canine femur. 11,12 The femoral angles computed, differently from those obtained using different diagnostic techniques, [1][2][3][4][5][6][7][8][9][10] were measured in a real 3D fashion. The main benefit relies on automated measurements, which are independent from the points selected by the operator, bone orientation and conformation as well.…”

Section: Introductionmentioning

confidence: 99%

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Accuracy of an automated three‐dimensional technique for the computation of femoral angles in dogs

et al. 2019

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Aims: The purpose of the study was to evaluate the accuracy of a three-dimensional (3D) automated technique (computer-aided design (aCAD)) for the measurement of three canine femoral angles: anatomical lateral distal femoral angle (aLDFA), femoral neck angle (FNA) and femoral torsion angle.Methods:Twenty-eight femurs equally divided intotwo groups (normal and abnormal) were obtained from 14 dogs of different conformations (dolicomorphic and chondrodystrophicCT scans and 3D scanner acquisitions were used to create stereolithographic (STL) files , which were run in a CAD platform. Two blinded observers separately performed the measurements using the STL obtained from CT scans (CT aCAD) and 3D scanner (3D aCAD), which was considered the gold standard method. C orrelation coefficients were used to investigate the strength of the relationship between the two measurements.Results: A ccuracy of the aCAD computation was good, being always above the threshold of R2 of greater than 80 per cent for all three angles assessed in both groups. a LDFA and FNA were the most accurate angles (accuracy >90 per cent).Conclusions: The proposed 3D aCAD protocol can be considered a reliable technique to assess femoral angle measurements in canine femur. The developed algorithm automatically calculates the femoral angles in 3D, thus considering the subjective intrinsic femur morphology. The main benefit relies on a fast user-independent computation, which avoids user-related measurement variability. The accuracy of 3D details may be helpful for patellar luxation and femoral bone deformity correction, as well as for the design of patient- specific, custom-made hip prosthesis implants.

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Section: Introductionmentioning

confidence: 90%

Section: Ct Scansmentioning

confidence: 99%

Section: Ct Scansmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accuracy of an automated three‐dimensional technique for the computation of femoral angles in dogs

et al. 2019

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“…Preoperative planning for antebrachial deformity has been described based on orthogonal radiographs 3,6 . However, advancements within the orthopedic field have introduced three-dimensional (3D) imaging techniques such as computed tomography (CT) 14 and computer-aided-design (CAD) software 8,16 to enhance visualization of bone models. The acceptance of computed-based technology has strongly encouraged the customization and surgical use of 3D printed guides to aid surgeons intraoperatively 1 .…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional computer-assisted corrective osteotomy with a patient-specific surgical guide for an antebrachial limb deformity in two dogs

Longo¹,

Penelas²,

Gutbrod³

et al. 2019

SAT

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We describe patient-specific surgical guide prototyping and surgical treatment of a complex antebrachial deformity in two skeletally mature dogs presenting with chronic lameness. Computer-assisted surgery was elected to increase accuracy in the correction of the complexity deformity. Radiographs and CT scans revealed a biplane deformity with valgus, procurvatum and external torsion of the right radius in both cases. The pre-surgical planning started from the quantification of the angular deformity, computer simulated correction to end up with a rehearsal surgery on 3D printed bone models. During the surgery, the custom-made osteotomy guides closely fitted the bone, allowing for a precise corrective osteotomy, that was stabilized with two locking plates. Postoperative x-rays showed successful correction of the deformity. At the follow up recheck examinations at 8 and 12 weeks postoperatively the dogs had improved lameness, weight-bearing and progression of bone healing were observed in both dogs. Patientspecific surgical guides allowed for a satisfactory correction of the antebrachial deformity. Additional benefits of using customized surgical devices include standardization and reduced surgical time.

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3D surface imaging of abdominal wall muscular contraction

Todros

Cesare

Pianigiani

et al. 2019

Computer Methods and Programs in Biomedicine

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Automated computation of femoral angles in dogs from three-dimensional computed tomography reconstructions: Comparison with manual techniques

Cited by 16 publications

References 28 publications

Accuracy of an automated three‐dimensional technique for the computation of femoral angles in dogs

Accuracy of an automated three‐dimensional technique for the computation of femoral angles in dogs

Three-dimensional computer-assisted corrective osteotomy with a patient-specific surgical guide for an antebrachial limb deformity in two dogs

3D surface imaging of abdominal wall muscular contraction

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