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Hip centre of rotation

Daniele Munegato, Marco Bigoni, Romeo Sotiri, Antongiulio Bruschetta, Robert J Omeljaniuk, Marco Turati, Rossi Andrea, Giovanni Zatti
INTRODUCTION: This study evaluates mid-term results of acetabular revision using a hemispherical acetabular cup in Trabecular Titanium with a cage construct. METHODS: We reviewed 36 acetabular revisions performed with the Delta Revision TT cup in 34 patients (mean age = 75, range: 45-92 years). Acetabular defect types (Paprosky classification) included (1) 2B ( n = 5), (2) 2C ( n = 7), (3) 3A ( n = 15), and (4) 3B ( n = 9). Morcellised bone allografts were used in 24 cases, and synthetic bone used in 11...
November 2018: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
Mattia Loppini, Paolo Schiavi, Antonello Della Rocca, Francesco Traverso, Federico Della Rocca, Giuseppe Mazziotta, Franco Astore, Guido Grappiolo
INTRODUCTION: Modular reconstruction systems based on trabecular metal (TM) prosthetic components have been increasingly used in the last decade for the management of severe acetabular bone defects. The aim of this study was to assess the clinical and radiographic outcomes of double-cup technique for the management of Paprosky type III defects without pelvic discontinuity. METHODS: A retrospective review was performed for all patients undergoing acetabular reconstruction with 2 TM cups at a tertiary referral centre between 2010 and 2015...
November 2018: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
Federico De Meo, Giorgio Cacciola, Vittorio Bellotti, Antongiolio Bruschetta, Pietro Cavaliere
INTRODUCTION: Severe acetabular bone loss during revision hip arthroplasty can be restored with different surgical techniques. Best results have been observed using porous tantalum cementless cups. Trabecular Titanium (TT) cups were designed to reproduce the structure, mechanical and biological characteristics of trabecular bone. Few clinical studies have been published with these cups. The aim of this study is to evaluate the clinical and radiological outcome of patients with large acetabular defects (Paprosky IIb or higher) revised using TT cups...
November 2018: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
Paul J Felton, Maurice R Yeadon, Mark A King
Planar simulation models which assume coincident joint centres at the hip and shoulder are often used to investigate subject-specific maximal performances rather than 3D models due to the viability of determining subject-specific parameters. To investigate the effect of coincident joint centres on model accuracy, three variants of a 16-segment planar subject-specific angle-driven model were evaluated using an elite cricket fast bowling performance: (a) planar representation assuming coincident joint centres; (b) planar representation with non-coincident hip joint centres; (c) planar representation with non-coincident hip and shoulder joint centres...
January 24, 2019: Journal of Applied Biomechanics
Lin Meng, Craig Childs, Arjan Buis
Functional methods identify joint centres as the centre of rotation (CoR) of two adjacent movements during an ad-hoc movement. The methods have been used for functionally determining hip joint centre in gait analysis and have revealed advantages compared to predictive regression techniques. However, the current implementation of functional methods hinders its application in clinical use when subjects have difficulties performing multi-plane movements over the required range. In this study, we systematically investigated whether functional methods can be used to localise the CoR during a quasi-planar movement...
2019: PloS One
B Kayani, S Konan, R R Thakrar, S S Huq, F S Haddad
OBJECTIVES: The primary objective of this study was to compare accuracy in restoring the native centre of hip rotation in patients undergoing conventional manual total hip arthroplasty (THA) versus robotic-arm assisted THA. Secondary objectives were to determine differences between these treatment techniques for THA in achieving the planned combined offset, component inclination, component version, and leg-length correction. MATERIALS AND METHODS: This prospective cohort study included 50 patients undergoing conventional manual THA and 25 patients receiving robotic-arm assisted THA...
January 2019: Bone & Joint Journal
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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