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Hip centre of rotation

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https://www.readbyqxmd.com/read/30419513/understanding-cutting-maneuvers-the-mechanical-consequence-of-preparatory-strategies-and-foot-strike-pattern
#1
Sina David, Marion Mundt, Igor Komnik, Wolfgang Potthast
OBJECTIVES: This study investigated the relation of different previously reported preparatory strategies and musculo-skeletal loading during fast preplanned 90° cutting maneuvers (CM). The aim was to increase the understanding of the connection between whole body orientation, preparatory actions and the solution strategy to fulfil the requirements of a CM. METHODS: Three consecutive steps of anticipated 90° CMs were investigated in a 3D movement analysis setup...
November 9, 2018: Human Movement Science
https://www.readbyqxmd.com/read/30354686/labral-hypertrophy-correlates-with-borderline-hip-dysplasia-and-microinstability-in-femoroacetabular-impingement-a-matched-case-control-analysis
#2
Benedict U Nwachukwu, Michael A Gaudiani, Nathan A Marsh, Anil S Ranawat
PURPOSE: The goal of this study was to: (1) investigate the association between labral hypertrophy and radiographic and computed tomography (CT) imaging measurements of dysplasia in a femoroacetabular impingement (FAI) cohort; (2) evaluate the association between physical examination parameters suggestive of microinstability and labral hypertrophy. METHODS: A retrospective case-control study was performed. Labral hypertrophy was defined as intraoperative labral width measuring greater >4 mm...
October 25, 2018: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/30322642/biomechanical-but-not-timed-performance-asymmetries-persist-between-limbs-9-months-after-acl-reconstruction-during-planned-and-unplanned-change-of-direction
#3
Enda King, Chris Richter, Andy Franklyn-Miller, Katherine Daniels, Ross Wadey, Mark Jackson, Ray Moran, Siobhan Strike
Whilst anterior cruciate ligament injury commonly occurs during change of direction (CoD) tasks, there is little research on how athletes execute CoD after anterior cruciate ligament reconstruction (ACLR). The aims of this study were to determine between-limb and between-test differences in performance (time) and joint kinematics and kinetics during planned and unplanned CoD. One hundred and fifty-six male subjects carried out 90° maximal effort, planned and unplanned CoD tests in a 3D motion capture laboratory 9 months after ACLR...
November 16, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/30306217/customized-implants-for-acetabular-paprosky-iii-defects-may-be-positioned-with-high-accuracy-in-revision-hip-arthroplasty
#4
Markus Weber, Lena Witzmann, Jan Wieding, Joachim Grifka, Tobias Renkawitz, Benjamin Craiovan
PURPOSE: In revision hip arthroplasty, custom-made implants are one option in patients with acetabular Paprosky III defects. METHODS: In a retrospective analysis, we identified 11 patients undergoing cup revision using a custom-made implant. The accuracy of the intended position of the implant was assessed on post-operative 3D CT and compared to the pre-operative 3D planning in terms of inclination, anteversion, and centre of rotation. In addition, the accuracy of post-operative plain radiographs for measuring implant position was evaluated in relation to the 3D CT standard...
October 10, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/30251192/does-high-hip-centre-affect-dislocation-after-total-hip-arthroplasty-for-developmental-dysplasia-of-the-hip
#5
Keisuke Komiyama, Jun-Ichi Fukushi, Goro Motomura, Satoshi Hamai, Satoshi Ikemura, Masanori Fujii, Yasuharu Nakashima
BACKGROUND: To achieve sufficient socket coverage by the native bone, high placement of cementless acetabular cup is often required. We previously reported, using computer simulation, that higher hip centre improved the bone coverage but decreased the range of motion in total hip arthroplasty (THA) for patients with hip dysplasia. However, in a clinical setting, the correlation between the hip centre height and dislocation after primary THA is still unclear. We examined whether a high hip centre affects dislocation after THA...
September 24, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29971509/relationship-between-spinal-sagittal-alignment-and-acetabular-coverage-a-patient-matched-control-study
#6
Kensuke Fukushima, Masayuki Miyagi, Gen Inoue, Eiki Shirasawa, Katsufumi Uchiyama, Naonobu Takahira, Masashi Takaso
INTRODUCTION: The significance of the relationship between the spine and hip joints has been frequently discussed. However, the relationship between acetabular coverage and spinal sagittal alignment has not been fully elucidated as previous studies did not adequately control for factors that might affect the spinopelvic alignment. The aim of this study was to elucidate the impact of acetabular coverage on spinal sagittal alignment by comparing patient groups matched on sex, age, and the presence of hip and anterior impingement pain...
July 3, 2018: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29865895/revision-surgery-for-leg-length-inequality-after-primary-hip-replacement
#7
Anthony B McWilliams, Anastasios Lampropoulos, Martin H Stone
BACKGROUND: We discuss the surgical results of revision surgery for patients with refractory symptomatic leg length inequality (LLI) after primary hip replacement. METHODS: This is a retrospective review of 21 patients who underwent revision for LLI after primary total hip replacement. All of them were referred to a tertiary clinic between 2006 and 2015. Leg length was measured, to the nearest mm, using Woolson's validated X-ray technique which references to centre of femoral rotation, the acetabular teardrop and the midpoint of the lesser trochanter...
June 1, 2018: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/29739249/incidence-risk-factors-and-prognosis-of-transient-pseudosubluxation-after-total-hip-arthroplasty
#8
Yong-Han Cha, Woo-Lam Jo, Young-Kyun Lee, Yong-Chan Ha, Javad Parvizi, Kyung-Hoi Koo
INTRODUCTION: Pseudosubluxation is a transient separation of the prosthetic femoral head from the acetabular liner during the anaesthetic period after total hip arthroplasty (THA). However, little is known about the frequency, pathomechanism, risk factors or natural history. METHODS: To determine the incidence, direction of the displacement, risk factors and subsequent instability of pseudosubluxation, we evaluated 1099 primary cementless THAs (943 patients), which were performed during 8 years at one institution...
May 1, 2018: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/29704828/a-computational-parametric-study-on-edge-loading-in-ceramic-on-ceramic-total-hip-joint-replacements
#9
Feng Liu, Li Feng, Junyuan Wang
Edge loading in ceramic-on-ceramic total hip joint replacement is an adverse condition that occurs as the result of a direct contact between the head and the cup rim. It has been associated with translational mismatch in the centres of rotation of the cup and head, and found to cause severe wear and early failure of the implants. Edge loading has been considered in particular in relation to dynamic separation of the cup and head centres during a gait cycle. Research has been carried out both experimentally and computationally to understand the mechanism including the influence of bearing component positioning on the occurrence and severity of edge loading...
July 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29657851/kinematic-alignment-technique-for-total-hip-and-knee-arthroplasty-the-personalized-implant-positioning-surgery
#10
Charles Rivière, Stefan Lazic, Loïc Villet, Yann Wiart, Sarah Muirhead Allwood, Justin Cobb
Conventional techniques for hip and knee arthroplasty have led to good long-term clinical outcomes, but complications remain despite better surgical precision and improvements in implant design and quality.Technological improvements and a better understanding of joint kinematics have facilitated the progression to 'personalized' implant positioning (kinematic alignment) for total hip (THA) and knee (TKA) arthroplasty, the true value of which remains to be determined.By achieving a true knee resurfacing, the kinematic alignment (KA) technique for TKA aims at aligning the components with the physiological kinematic axes of the knee and restoring the constitutional tibio-femoral joint line frontal and axial orientation and soft-tissue laxity...
March 2018: EFORT Open Reviews
https://www.readbyqxmd.com/read/29653242/effect-of-combined-flexion-and-external-rotation-on-measurements-of-the-proximal-femur-from-anteroposterior-pelvic-radiographs
#11
J D O'Connor, M Rutherford, J C Hill, D E Beverland, N J Dunne, A B Lennon
INTRODUCTION: Fixed flexion and external rotation contractures are common in patients with hip osteoarthritis and, in particular, before total hip replacement (THR). We aimed to answer the following question: how does combined flexion and external rotation of the femur influence the radiographic assessment of (1) femoral offset (FO) (2) neck-shaft angle (NSA) and (3) distance (parallel to the femoral axis) from greater trochanter to femoral head center (GT-FHC)? HYPOTHESIS: Combined flexion and external rotation impact the accuracy of two-dimensional (2D) proximal femur measurements...
June 2018: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/29550754/clinical-and-biomechanical-outcomes-of-rehabilitation-targeting-intersegmental-control-in-athletic-groin-pain-prospective-cohort-of-205-patients
#12
Enda King, Andrew Franklyn-Miller, Chris Richter, Eamon O'Reilly, Mark Doolan, Kieran Moran, Siobhan Strike, Éanna Falvey
BACKGROUND: Clinical assessments and rehabilitation in athletic groin pain (AGP) have focused on specific anatomical structures and uniplanar impairments rather than whole body movement. OBJECTIVE: To examine the effectiveness of rehabilitation that targeted intersegmental control in patients with AGP and to investigate post rehabilitation changes in cutting biomechanics. METHODS: Two hundred and five patients with AGP were rehabilitated focusing on clinical assessment of intersegmental control, linear running and change of direction mechanics in this prospective case series...
August 2018: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/29453586/three-dimensional-orientation-and-location-dependent-varying-rules-of-radiographic-angles-of-the-acetabular-cup
#13
Jing-Xin Zhao, Xiu-Yun Su, Zhe Zhao, Ruo-Xiu Xiao, Li-Cheng Zhang, Pei-Fu Tang
AIM: The aim of this study is to demonstrate the varying rules of radiographic angles following varying three-dimensional (3D) orientations and locations of cup using an accurate mathematical model. METHODS: A cone model is established to address the quantitative relationship between the opening circle of cup and its ellipse projection on radiograph. The varying rules of two-dimensional (2D) radiographic anteversion (RA) and inclination (RI) angles can be analyzed...
August 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29335832/lateral-trochanteric-pain-following-total-hip-arthroplasty-radiographic-assessment-of-altered-biomechanics-as-a-potential-aetiology
#14
Ali Abdulkarim, Cathy Keegan, Raazi Bajwa, Eoin Sheehan
INTRODUCTION: Lateral trochanteric pain (LTP) complicates up to 17% of cases of total hip arthroplasty (THA). Studies have refuted underlying trochanteric bursitis. Restoration of the femoral offset and reproduction of the natural femoral centre of rotation are important in successful arthroplasty. LTP is believed to be associated with their alteration. AIM: The aim of our study was to evaluate the effect of femoral offset and centre of rotation on the incidence of LTP post-THA...
August 2018: Irish Journal of Medical Science
https://www.readbyqxmd.com/read/29200662/gearing-effects-of-the-patella-knee-extensor-muscle-sesamoid-of-the-helmeted-guineafowl-during-terrestrial-locomotion
#15
V R Allen, R E Kambic, S M Gatesy, J R Hutchinson
Human patellae (kneecaps) are thought to act as gears, altering the mechanical advantage of knee extensor muscles during running. Similar sesamoids have evolved in the knee extensor tendon independently in birds, but it is unknown if these also affect the mechanical advantage of knee extensors. Here, we examine the mechanics of the patellofemoral joint in the helmeted guineafowl Numida meleagris using a method based on muscle and tendon moment arms taken about the patella's rotation centre around the distal femur...
November 2017: Journal of Zoology: Proceedings of the Zoological Society of London
https://www.readbyqxmd.com/read/29080951/morphological-variation-of-the-anterior-inferior-iliac-spine-affects-hip-range-of-motion-in-flexion-after-rotational-acetabular-osteotomy
#16
Hidetoshi Hamada, Masaki Takao, Takashi Sakai, Nobuhiko Sugano
PURPOSE: Reduced range of motion (ROM) in flexion and internal rotation are associated with impaired activities of daily living (ADL) after rotational acetabular osteotomy (RAO). This study focused on the morphological variation of the anterior inferior iliac spine in developmental dysplasia of the hip (DDH) and its impact on post-operative bony ROM after RAO. This study aimed to investigate the association between bony ROM after RAO and pre-operative morphological factors of the pelvis and femur, including a positional variation of the anterior inferior iliac spine...
June 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29029869/determination-of-the-hip-rotation-centre-from-landmarks-in-pelvic-radiograph
#17
Hasan Bombaci, Bestami Simsek, Mehmet Soyarslan, Mustafa Murat Yildirim
OBJECTIVE: The hip rotation centre (HRC) is an important reference point in cases of total hip arthroplasty (THA). The aim of this study is to investigate the reference points in the Turkish population that enable the identification of the HRC in standard pelvic radiographs. METHODS: The pelvic radiographs of 50 women and 50 men were examined. The mean age was 46.2 (range; 18-91). Patients with deformity of the hip joint and non-standard pelvic radiograph due to hip flexion contracture were excluded from the study...
December 2017: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/28941162/an-in-vitro-simulation-model-to-assess-the-severity-of-edge-loading-and-wear-due-to-variations-in-component-positioning-in-hip-joint-replacements
#18
O O'Dwyer Lancaster-Jones, S Williams, L M Jennings, J Thompson, G H Isaac, J Fisher, M Al-Hajjar
The aim of this study was to develop a preclinical in vitro method to predict the occurrence and severity of edge loading condition associated with the dynamic separation of the centres of the head and cup (in the absence of impingement) for variations in surgical positioning of the cup. Specifically, this study investigated the effect of both the variations in the medial-lateral translational mismatch between the centres of the femoral head and acetabular cup and the variations in the cup inclination angles on the occurrence and magnitude of the dynamic separation, the severity of edge loading, and the wear rate of ceramic-on-ceramic hip replacement bearings in a multi-station hip joint simulator during a walking gait cycle...
July 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28886084/an-in-vitro-simulation-method-for-the-tribological-assessment-of-complete-natural-hip-joints
#19
Dawn Groves, John Fisher, Sophie Williams
The use of hip joint simulators to evaluate the tribological performance of total hip replacements is widely reported in the literature, however, in vitro simulation studies investigating the tribology of the natural hip joint are limited with heterogeneous methodologies reported. An in vitro simulation system for the complete natural hip joint, enabling the acetabulum and femoral head to be positioned with different orientations whilst maintaining the correct joint centre of rotation, was successfully developed for this study...
2017: PloS One
https://www.readbyqxmd.com/read/28708201/the-impact-of-trabecular-metal-on-hip-centre-of-rotation-in-revision-and-complex-primary-hip-arthroplasty-a-radiological-review
#20
Carl O'Brien, Cillian J Keogh, Ailish Hannigan, Stephen Brennan, Cian Kennedy, Rehan Gul, James A Harty
INTRODUCTION: Total hip arthroplasty (THA) is a very successful procedure. Revision THA is becoming increasingly common. Recent developments to improve outcomes include the development of large trabecular metal (TM) acetabular cups and augments. There is a paucity of data on the benefit of these new techniques. METHODS: A single-centre retrospective review consisting of a radiological review of post-op revision THA anteroposterior pelvis. Data collection was performed using the Irish National Orthopaedic Register (INOR) and from a previous project...
September 19, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
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