Use of Hausdorff Distance and Computer Modelling to Evaluate Virtual Surgical Plans with Three-Dimensional Printed Guides against Freehand Techniques for Navicular Bone Repair in Equine Orthopaedics

Biedrzycki, Adam H.; Kistler, Hannah C.; Perez-Jimenez, Erik E; Morton, Alison J.

doi:10.1055/s-0040-1721846

Cited by 6 publications

(5 citation statements)

References 25 publications

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“…The remainder of the spinal column segments within each phase move concurrently with respect to the parent T11 vertebrae, thus preserving the alignments. Following this, the translation and angular rotation of each phase (resting, flexion, and extension) was exported as a transformation matrix and Hausdorff distances of L1, the furthest vertebrae away from T11, were measured to demonstrate maximal changes between different phases (Figure 4) (Biedrzycki et al, 2021).…”

Section: Methodsmentioning

confidence: 99%

Three-Dimensional Modeling and In Silico Kinematic Evaluation of Interspinous Ligament Desmotomy in Horses

Biedrzycki

Elane

2022

Front. Bioeng. Biotechnol.

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Background: Interspinous ligament desmotomy (ISLD) has been shown to improve the comfort of horses diagnosed with overriding dorsal spinous processes (DSP), but its effects on spine mobility are unknown.Objective: To objectively quantify the change in mobility of thoracic vertebrae following ISLD using CT and medical modeling software.Study design: Prospective cadaveric manipulation of seven equine thoracolumbar spines collected from T11-L1.Methods: Spines were collected from T11-L1 with the musculature intact. Flexion and extension phases were achieved with a ratchet device calibrated to 2000N. Bone volume CT scans were performed in resting, flexion, and extension phase preoperatively. Interspinous ligament desmotomy was performed at each intervertebral space (n = 8), and bone volume CT imaging was repeated for each phase. The spinal sections were individually segmented and imported into medical software for kinematic evaluation. T11 of each phase were superimposed, the distance between each dorsal spinous process, the total length of the spine, and the maximal excursion of the first lumbar vertebra along with angular rotational information were recorded.Results: The mean distance between each dorsal spinous process increased by 5.6 ± 4.9 mm, representing a 24 ± 21% increase in mobility following ISLD. L1 dorsoventral excursion increased by 15.3 ± 11.9 mm, craniocaudal motion increased by 6.9 ± 6.5 mm representing a 47 ± 36.5% and 14.5 ± 13.7% increase, respectively. The rotation of L1 about the mediolateral axis increased by 6.5° post-ISLD.Conclusion and Clinical Relevance: ISLD increases dorsoventral, craniocaudal, and rotational motion of the equine spine. The computer modeling methodology used here could be used to evaluate multiplanar spinal kinematics between treatments.

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Section: Methodsmentioning

confidence: 99%

Three-Dimensional Modeling and In Silico Kinematic Evaluation of Interspinous Ligament Desmotomy in Horses

Biedrzycki

Elane

2022

Front. Bioeng. Biotechnol.

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“…Once aligned, a “part comparison” was made between the two tendons ( Figure 3 ). The part comparison is a point-based comparison between two datasets which has also been termed the Hausdorff Distance ( 18 ). This generates a 3D color map which visually identifies changes in the tendon thickness.…”

Section: Methodsmentioning

confidence: 99%

Three-Dimensional Segmentation and in silico Comparison of Equine Deep Digital Flexor Tendon Pathology in Horses Undergoing Repeated MRI Examination

Trolinger-Meadows

Biedrzycki

et al. 2021

Front. Vet. Sci.

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The use of magnetic resonance imaging (MRI) has led to increased clinical and research applications using 3D segmentation and reconstructed volumetric data in musculoskeletal imaging. Lesions of the deep digital flexor tendon (DDFT) are a common pathology in horses undergoing MRI. Three-dimensional MRI reconstruction performed for volumetric tendon analysis in horses has not previously been documented. The aim of this proof-of-concept study was to evaluate the 3D segmentation of horses undergoing repeated MRI at several time points and to perform an analysis of the segmented DDFTs across time. MRI DICOM files were acquired from six horses undergoing repeated MRI examination of the foot for DDFT injury. Once segmented, volumetric tendon surface tessellation language (STL) files were created. Thickness and volumetric data were acquired for each tendon in addition to a tendon comparison across timepoints within each horse. Pearson correlation coefficients were calculated for comparison of MRI reports to computer analysis. There was a significant and positive correlation between MRI and medial record reports of clinical improvement or deterioration and computer analysis (r = 0.56, p = 0.01). The lower end range limit for tendon thickness varied between 0.16 and 1.74 mm. The upper end range limit for DDFT thickness varied between 4.6 and 23.6 mm. During tendon part comparison, changes in DDFT were reported between −3.0 and + 14.3 mm. Changes in DDFT size were non-uniform and demonstrated fluctuations throughout the tendon. The study was successful in establishing the volumetric appearance and thickness of the DDFT as it courses in the foot and tracking this over time. We encountered difficulties in accurate segmentation of the distal insertion of the DDFT as it blends with the distal phalanx. The data demonstrated that the DDFT can be segmented and volumetric studies based on size and shape can be performed using an in silico approach.

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“…Intraoperative placement of each pin guide was compared with the virtual plan by superimposing the proximal and distal segments of the mirror version of the intact contralateral tibia, with the guides in their virtually planned positions, over the postoperative tibia, using point-to-point registration. 4,27 Translation was determined by measuring the distance from the cranial tibial cortical defects to the respective pin guide's planned location. Angulation of the pin guides was compared with the virtually planned pin guide angulation in all three planes.…”

Section: Outcome Measuresmentioning

confidence: 99%

Efficacy of virtual surgical planning and a three‐dimensional‐printed, patient‐specific reduction system to facilitate alignment of diaphyseal tibial fractures stabilized by minimally invasive plate osteosynthesis in dogs: A prospective clinical study

Scheuermann,

Lewis,

Johnson

et al. 2024

Veterinary Surgery

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ObjectiveTo evaluate the efficacy of a three‐dimensional (3D)‐printed, patient‐specific reduction system for aligning diaphyseal tibial fractures stabilized using minimally invasive plate osteosynthesis (MIPO).Study designProspective clinical trial.Sample populationFifteen client owned dogs.MethodsVirtual 3D models of both pelvic limbs were created. Pin guides were designed to conform to the proximal and distal tibia. A reduction bridge was designed to align the pin guides based on the guides' spatial location. Guides were 3D printed, sterilized, and applied, in conjunction with transient application of a circular fixator, to facilitate indirect fracture realignment before plate application. Alignment of the stabilized tibiae was assessed using postoperative computed tomography scans.ResultsMean duration required for virtual planning was 2.5 h and a mean of 50.7 h elapsed between presentation and surgery. Guide placement was accurate with minor median discrepancies in translation and frontal, sagittal, and axial plane positioning of 2.9 mm, 3.6°, 2.7°, and 6.8°, respectively. Application of the reduction system restored mean tibial length and frontal, sagittal, and axial alignment within 1.7 mm, 1.9°, 1.7°, and 4.5°, respectively, of the contralateral tibia.ConclusionDesign and fabrication of a 3D‐printed, patient‐specific fracture reduction system is feasible in a relevant clinical timeline. Intraoperative pin‐guide placement was reasonably accurate with minor discrepancies compared to the virtual plan. Custom 3D‐printed reduction system application facilitated near‐anatomic or acceptable fracture reduction in all dogs.Clinical significanceVirtual planning and fabrication of a 3D‐printing patient‐specific fracture reduction system is practical and facilitated acceptable, if not near‐anatomic, fracture alignment during MIPO.

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Use of Hausdorff Distance and Computer Modelling to Evaluate Virtual Surgical Plans with Three-Dimensional Printed Guides against Freehand Techniques for Navicular Bone Repair in Equine Orthopaedics

Cited by 6 publications

References 25 publications

Three-Dimensional Modeling and In Silico Kinematic Evaluation of Interspinous Ligament Desmotomy in Horses

Three-Dimensional Modeling and In Silico Kinematic Evaluation of Interspinous Ligament Desmotomy in Horses

Three-Dimensional Segmentation and in silico Comparison of Equine Deep Digital Flexor Tendon Pathology in Horses Undergoing Repeated MRI Examination

Efficacy of virtual surgical planning and a three‐dimensional‐printed, patient‐specific reduction system to facilitate alignment of diaphyseal tibial fractures stabilized by minimally invasive plate osteosynthesis in dogs: A prospective clinical study

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