@article{Ng:2019:10.1177/0363546518815159,
author = {Ng, KCG and El, Daou H and Bankes, M and Rodriguez, y Baena F and Jeffers, J},
doi = {10.1177/0363546518815159},
journal = {American Journal of Sports Medicine},
pages = {420--430},
title = {Hip joint torsional loading before and after cam femoroacetabular impingement surgery},
url = {http://dx.doi.org/10.1177/0363546518815159},
volume = {47},
year = {2019}
}

Download

TY  - JOUR
AB  - Background: Surgical management of cam femoroacetabular impingement (FAI) aims to preserve the native hip and restore joint function, though it is unclear how the capsulotomy, cam deformity, and capsular repair influence joint mechanics to balance functional mobility.Purpose: The purpose was to examine the contributions of the capsule and cam deformity to hip joint mechanics. Using in vitro, cadaveric methods, we examined the individual effects of the surgical capsulotomy, cam resection, and capsular repair towards passive range of motion and resistance of applied torque.Study Design: Descriptive laboratory study.Methods: Twelve cadaveric hips with cam deformities (n = 12) were skeletonized to the capsule and mounted onto a robotic testing platform. The robot positioned each intact hip in multiple testing positions: 1) Extension, 2) Neutral 0°, 3) Flexion 30°, 4) Flexion 90°, 5) flexion-adduction and internal rotation (FADIR), 6) flexion-abduction and external rotation (FABER); and performed applicable internal and external rotations, recording the neutral path of motion until a 5-Nm torque was reached in each rotational direction. Each hip then underwent a series of surgical stages (T-capsulotomy, cam resection, capsular repair) and was retested to reach 5 Nm internal and external torque again after each stage. In addition, during the capsulotomy and cam resection stages, the initial intact hip’s recorded path of motion was replayed to measure changes in resisted torque.Results: Examining changes in motion, external rotation increased substantially after capsulotomies, but internal rotation only further increased at Flexion 90° (change = +32%, P = .001, d = .58) and FADIR (change = +33%, P < .001, d = .51) after cam resections. Capsular repair provided marginal restraint for internal rotation, but restrained the external rotation compared to the capsulotomy stage. Examining changes in torque, both internal and external torque resistance dec
AU  - Ng,KCG
AU  - El,Daou H
AU  - Bankes,M
AU  - Rodriguez,y Baena F
AU  - Jeffers,J
DO  - 10.1177/0363546518815159
EP  - 430
PY  - 2019///
SN  - 0363-5465
SP  - 420
TI  - Hip joint torsional loading before and after cam femoroacetabular impingement surgery
T2  - American Journal of Sports Medicine
UR  - http://dx.doi.org/10.1177/0363546518815159
UR  - https://journals.sagepub.com/doi/10.1177/0363546518815159
VL  - 47
ER  - 

Download