@article{Ng:2022:10.2106/JBJS.21.00405,
author = {Ng, KCG and Bankes, MJK and El, Daou H and Beaulé, PE and Cobb, JP and Jeffers, JRT},
doi = {10.2106/JBJS.21.00405},
journal = {J Bone Joint Surg Am},
pages = {1015--1023},
title = {Capsular Mechanics After Periacetabular Osteotomy for Hip Dysplasia.},
url = {http://dx.doi.org/10.2106/JBJS.21.00405},
volume = {104},
year = {2022}
}

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TY  - JOUR
AB  - BACKGROUND: Hip dysplasia is characterized by insufficient acetabular coverage around the femoral head, which leads to instability, pain, and injury. Periacetabular osteotomy (PAO) aims to restore acetabular coverage and function, but its effects on capsular mechanics and joint stability are still unclear. The purpose of this study was to examine the effects of PAO on capsular mechanics and joint range of motion in dysplastic hips. METHODS: Twelve cadaveric dysplastic hips (denuded to bone and capsule) were mounted onto a robotic tester and tested in multiple positions: (1) full extension, (2) neutral 0°, (3) flexion of 30°, (4) flexion of 60°, and (5) flexion of 90°. In each position, the hips underwent internal and external rotation, abduction, and adduction using 5 Nm of torque. Each hip then underwent PAO to reorient the acetabular fragment, preserving the capsular ligaments, and was retested. RESULTS: The PAO reduced internal rotation in flexion of 90° (IR = -5°; p = 0.003), and increased external rotation in flexion of 60° (ER = +7°; p = 0.001) and flexion of 90° (ER = +11°; p = 0.001). The PAO also reduced abduction in extension (ABD = -10°; p = 0.002), neutral 0° (ABD = -7°; p = 0.001), and flexion of 30° (ABD = -8°; p = 0.001), but increased adduction in neutral 0° (ADD = +9°; p = 0.001), flexion of 30° (ADD = +11°; p = 0.002), and flexion of 60° (ADD = +11°; p = 0.003). CONCLUSIONS: PAO caused reductions in hip abduction and internal rotation but greater increases in hip adduction and external rotation. The osseous acetabular structure and capsule both play a role in the balance between joint mobility and stability after PAO.
AU  - Ng,KCG
AU  - Bankes,MJK
AU  - El,Daou H
AU  - Beaulé,PE
AU  - Cobb,JP
AU  - Jeffers,JRT
DO  - 10.2106/JBJS.21.00405
EP  - 1023
PY  - 2022///
SP  - 1015
TI  - Capsular Mechanics After Periacetabular Osteotomy for Hip Dysplasia.
T2  - J Bone Joint Surg Am
UR  - http://dx.doi.org/10.2106/JBJS.21.00405
UR  - https://www.ncbi.nlm.nih.gov/pubmed/35133990
UR  - http://hdl.handle.net/10044/1/93700
VL  - 104
ER  - 

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