The Accuracy of the Use of Functional Hip Motions on Localization of the Center of the Hip

Speirs, Andrew; Benoît, Daniel; Beaulieu, Mélanie L.; Lamontagne, Mario; Beaulé, Paul E.

doi:10.1007/s11420-012-9296-6

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…Although full capsular repairs could be effective for larger capsulotomies or overresected cams, 31,79 closures should always be performed with extreme caution so as to not overtighten the capsule and exchange instability for joint tightness. The translations of the hip joint center of rotation 17,73 should be examined in the future to help characterize microinstability over the series of surgical stages. Furthermore, the balance between capsular repair and plication should be further examined to establish objective measures to minimize iatrogenic instability.…”

Section: Discussionmentioning

confidence: 99%

Hip Joint Torsional Loading Before and After Cam Femoroacetabular Impingement Surgery

Daou

Bankes

et al. 2018

Am J Sports Med

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Background:Surgical management of cam femoroacetabular impingement (FAI) aims to preserve the native hip and restore joint function, although it is unclear how the capsulotomy, cam deformity, and capsular repair influence joint mechanics to balance functional mobility.Purpose: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 on passive range of motion and resistance of applied torque.Study Design:Descriptive laboratory study.Methods:Twelve cadaveric hips with cam deformities 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), and (6) flexion-abduction and external rotation. Then the robot performed applicable internal and external rotations, recording the neutral path of motion until a 5-N·m of 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 N·m of internal and external torque again after each stage. 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:Regarding changes in motion, external rotation increased substantially after capsulotomies, but internal rotation only further increased at flexion 90° (change +32%, P = .001, d = 0.58) and FADIR (change +33%, P < .001, d = 0.51) after cam resections. Capsular repair provided marginal restraint for internal rotation but restrained the external rotation compared with the capsulotomy stage. Regarding changes in torque, both internal and external torque resistance decreased after capsulotomy. Compared with the capsulotomy stage, cam resection further reduced internal torque resistance during flexion 90° (change −45%, P < .001, d = 0.98) and FADIR (change −37%, P = .003, d = 1.0), where the cam deformity accounted for 21% of the intact hip’s torsional resistance in flexion 90° and 27% in FADIR.Conclusion:Although the capsule played a predominant role in joint constraint, the cam deformity provided 21% to 27% of the intact hip’s resistance to torsional load in flexion and internal rotation. Resecting the cam deformity would remove this loading on the chondrolabral junction.Clinical Relevance:These findings are the first to quantify the contribution of the cam deformity to resisting hip joint torsional loads and thus quantify the reduced loading on the chondrolabral complex that can be achieved after cam resection.

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Section: Discussionmentioning

confidence: 99%

Hip Joint Torsional Loading Before and After Cam Femoroacetabular Impingement Surgery

Daou

Bankes

et al. 2018

Am J Sports Med

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“…One error in determination of HJC location using image-based techniques is caused by the assumption of the femoral head as a sphere although it is not perfectly spherical. The use of image-based determination of the HJC is limited as MRI-based techniques require expensive medical imaging and the other modalities in this category expose the subject to ionizing radiation [7,8]. Predictive methods estimate the HJC based on regression equations between palpable bony landmarks and the joint centre [8].…”

Section: Motivationmentioning

confidence: 99%

“…In general, coordinate transformation techniques have been reported to be more accurate and much less sensitive to noise compared to sphere fitting techniques. Ehrig et al reported that the SCoRE algorithm is the most accurate transformation technique[7,23].…”

mentioning

confidence: 99%

Non-invasive Assessment and Compensation of Soft-tissue Artefacts in Hip Joint Kinematics

Rouhandeh¹

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Accurate location of the hip joint centre is a necessary component in biomechanical human motion analysis to measure skeletal parameters and describe human motion. In human movement analysis, the hip joint centre can be estimated using functional methods based on the relative motion of the femur to pelvis using reflective markers attached to the skin surface through an optical motion capture system. Determination of the hip joint centre by functional methods suffers inaccuracy due to the soft tissue artefact; this is the relative motion between the markers and the underlying bone due to the muscle and skin deformation. Therefore, one of the main objectives in human movement analysis is the assessment and correction of this artefact. Various studies have described the movement of the soft tissue artefact and minimized it invasively. To solve this issue, we present a non-invasive method to assess and reduce the effect of the soft tissue artefact using optical motion capture data and tissue thickness from ultrasound measurements during flexion, extension, and abduction of the hip joint. Results show that the displacement of markers is non-linear and larger in areas closer to the hip joint. Also, the marker displacements are dependent on the movement type, being relatively larger in abduction movement. The quantification of soft tissue artefacts is used as a basis for a correction procedure for hip joint centre and minimizing the soft tissue artefact effects. Results show that our method for soft tissue artefact assessment and minimization reduces the error in the functional hip joint centre approximately from 13-23mm to 7-14 mm.iii

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Hip Joint Centre Localization: Evaluation of Formal Methods and Effects on Joint Kinematics

Żuk

Świątek‐Najwer

Pezowicz

2014

Advances in Intelligent Systems and Computing

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The Accuracy of the Use of Functional Hip Motions on Localization of the Center of the Hip

Cited by 5 publications

References 29 publications

Hip Joint Torsional Loading Before and After Cam Femoroacetabular Impingement Surgery

Hip Joint Torsional Loading Before and After Cam Femoroacetabular Impingement Surgery

Non-invasive Assessment and Compensation of Soft-tissue Artefacts in Hip Joint Kinematics

Hip Joint Centre Localization: Evaluation of Formal Methods and Effects on Joint Kinematics

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