Hip dysplasia - imaging

Question 1

Vezzoni device

Broeckx VCOT 2018
Bertal VCOT 2018, 2019, 2021

DI, NA, LI
LI compared with FCI grade

Answer 1

NA substantial variability
DI and LI repoduceable

reliable in house device to assess laxity

LI and FCI grade mod-good correlation
Wide range of passive laxity in dogs phenotypically normal based on FCI grading method

Question 2

Measuring ALO and version

Fracka VCOT 2023 -3D modelling found variation between patients

Answer 2

Postop assessment ALO
-Ellipse using trigonometry - not accurate enough
-Using a measurement from the center of the femoral head to the truncated surface of the cup
-Visualisation of truncated portion of compoment to reference chart

Intraop ALO
-Radioopaque cup assessment device (Dalbeth VCOT 2020)
-Fluoro method (Sadowitz VCOT 2023)

Version measured by ventral edge of truncated surface
-Version measurement is useful when inclination <20deg

Question 3

Lucaci VRU 2023

Metallosis after THR

Answer 3

Cloud sign (=metallosis) = amorphous soft tissue and mineral opacities surrounding proximal femur and prosthetic stem

accumulation of metallic debris around implant

Question 4

Kwananocha Frontiers 2023

ACE-X (Ti implant to increase femoral head coverage and decrease laxity) - shelf arthroplasty

prospective 61 hips 34 dogs

Answer 4

FHC improved, sublux gone

OA sig increased - but lead time?