Imperial College London
Alternate

ProfessorJustinCobb

Faculty of Medicine, Department of Surgery & Cancer

Chair in Orthopaedic Surgery
 
 
 
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Contact

 

+44 (0)20 7594 5534j.cobb Website

 
 
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Assistant

 

Miss Colinette Hazel +44 (0)20 7594 2725

 
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Location

 

c/oSir Michael Uren HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Ng:2021:10.1016/j.arthro.2020.08.037,
author = {Ng, KCG and Bankes, M and El, Daou H and Rodriguez, y Baena F and Jeffers, J},
doi = {10.1016/j.arthro.2020.08.037},
journal = {Arthroscopy: The Journal of Arthroscopy and Related Surgery},
pages = {159--170},
title = {Cam osteochondroplasty for femoroacetabular impingement increases microinstability in deep flexion: A cadaveric study},
url = {http://dx.doi.org/10.1016/j.arthro.2020.08.037},
volume = {37},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Purpose: The purpose of this in vitro cadaveric study was to examine the contributions of each surgical stage during cam femoroacetabular impingement (FAI) surgery (i.e., intact cam hip, T8 capsulotomy, cam resection, capsular repair) towards hip range of motion, translations, and microinstability.Methods: Twelve cadaveric cam hips were denuded to the capsule and mounted onto a robotic tester. Hips were positioned in several flexion positions: Full Extension, Neutral 0°, Flexion 30°, and Flexion 90°; and performed internal-external rotations to 5-Nm torque in each position. Hips underwent a series of surgical stages (T-capsulotomy, cam resection, capsular repair) and was retested after each stage. Changes in range of motion, translation, and microinstability (overall translation normalized by femoral head radius) were measured after each stage.Results: For range of motion, cam resection increased internal rotation at Flexion 90° (ΔIR = +6°, P = .001), but did not affect external rotation. Capsular repairs restrained external rotations compared to the cam resection stage (ΔER = –4 to –8°, P ≤ .04). For translations, the hip translated after cam resection at Flexion 90° in the medial-lateral plane (ΔT = +1.9 mm, P = .04), relative to the intact and capsulotomy stages. For microinstability, capsulotomy increased microinstability in Flexion 30° (ΔM = +0.05; P = .003), but did not further increase after cam resection. At Flexion 90°, microinstability did not increase after capsulotomy (ΔM = +0.03; P = .2, d = .24), but substantially increased after cam resection (ΔM = +0.08; P = .03), accounting for a 31% change with respect to the intact stage.Conclusions: Cam resection increased microinstability by 31% during deep hip flexion relative to the intact hip. This suggests that iatrogenic microinstability may be due to separation of the labral seal and resected contour of the femoral head.
AU  - Ng,KCG
AU  - Bankes,M
AU  - El,Daou H
AU  - Rodriguez,y Baena F
AU  - Jeffers,J
DO  - 10.1016/j.arthro.2020.08.037
EP  - 170
PY  - 2021///
SN  - 0749-8063
SP  - 159
TI  - Cam osteochondroplasty for femoroacetabular impingement increases microinstability in deep flexion: A cadaveric study
T2  - Arthroscopy: The Journal of Arthroscopy and Related Surgery
UR  - http://dx.doi.org/10.1016/j.arthro.2020.08.037
UR  - https://www.sciencedirect.com/science/article/pii/S0749806320307325?via%3Dihub
UR  - http://hdl.handle.net/10044/1/82045
VL  - 37
ER  -
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