The effect of arch drop on tibial rotation and tibiofemoral articular contact stress

Segal, N.A.; Rabe, Kaitlin G.; Waheed, S.; Anderson, David

doi:10.1016/j.joca.2017.02.228

Cited by 1 publication

(1 citation statement)

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“…Beyond providing relatively simplistic measurements of joint alignment, this emerging technology holds the exciting potential for simultaneously providing 3D geometry and functional position data for generating more accurate patient-specific computational models of joints. However, while several studies have utilized WBCT scans for computational model development in other joints, 20,[22][23][24]28,29 WBCT scans have not been used to create computational models of the hip. Though improved patient-specificity of computed contact mechanics at the hip are appealing, the effects of incorporating WBCT data on the computed contact mechanics are unclear.…”

Section: Introductionmentioning

confidence: 99%

Incorporating patient-specific hip orientation from weightbearing computed tomography affects discrete element analysis-computed regional joint contact mechanics in individuals treated with periacetabular osteotomy for hip dysplasia

Rivas,

Aitken,

Dibbern

et al. 2024

Proc Inst Mech Eng H

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Computational models of the hip often omit patient-specific functional orientation when placing imaging-derived bony geometry into anatomic landmark-based coordinate systems for application of joint loading schemes. The purpose of this study was to determine if this omission meaningfully alters computed contact mechanics. Discrete element analysis models were created from non-weightbearing (NWB) clinical CT scans of 10 hip dysplasia patients (11 hips) and oriented in the International Society of Biomechanics (ISB) coordinate system (NWB-ISB). Three additional models were generated for each hip by adding patient-specific stance information obtained via weightbearing CT (WBCT) to each ISB-oriented model: (1) patient-specific sagittal tilt added (WBCT-sagittal), (2) coronal and axial rotation from optical motion capture added to (1; WBCT-combo), and (3) WBCT-derived axial, sagittal, and coronal rotation added to (1; WBCT-original). Identical gait cycle loading was applied to all models for a given hip, and computed contact stress and contact area were compared between model initialization techniques. Addition of sagittal tilt did not significantly change whole-joint peak ( p = 0.922) or mean ( p = 0.871) contact stress or contact area ( p = 0.638). Inclusion of motion-captured coronal and axial rotation (WBCT-combo) decreased peak contact stress ( p = 0.014) and slightly increased average contact area ( p = 0.071) from WBCT-sagittal models. Including all WBCT-derived rotations (WBCT-original) further reduced computed peak contact stress ( p = 0.001) and significantly increased contact area ( p = 0.001). Variably significant differences ( p = 0.001–1.0) in patient-specific acetabular subregion mechanics indicate the importance of functional orientation incorporation for modeling applications in which local contact mechanics are of interest.

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