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hip mechanics

Ahmed Siddiqi, Carl T Talmo, James V Bono
Dislodgment of trial femoral heads and migration into the pelvis during total hip arthroplasty is a rarely reported complication with limited published cases. There are three primary mechanisms of femoral head separation: dislodgement during reduction attempt, disassociation from anterior dislocation while assessing anterior stability, and during dislocation after implant trialing. If the trial femoral migrates beyond the pelvic brim, it is safer to finish the total hip arthroplasty and address the retained object after repositioning or in a planned second procedure with a general surgeon...
March 2018: Arthroplasty Today
Javier I Borráz-León, Ana Lilia Cerda-Molina, Markus J Rantala, Lilian Mayagoitia-Novales
Higher testosterone levels have been positively related to a variety of social behaviors and personality traits associated with intrasexual competition. The aim of this study was to evaluate the role of testosterone levels and personality traits such as aggressiveness, competitiveness, and self-esteem on the task of choosing a fighting competitor (a rival) with or without a motivation to fight. In Study 1, a group of 119 men participated in a task for choosing a rival through pictures of men with high-dominant masculinity versus low-dominant masculinity...
January 2018: Evolutionary Psychology: An International Journal of Evolutionary Approaches to Psychology and Behavior
Tudor Borza, Mary K Oerline, Ted A Skolarus, Edward C Norton, Justin B Dimick, Bruce L Jacobs, Lindsey A Herrel, Chad Ellimoottil, John M Hollingsworth, Andrew M Ryan, David C Miller, Vahakn B Shahinian, Brent K Hollenbeck
OBJECTIVE: To evaluate the effect of Medicare Shared Savings Program accountable care organizations (ACOs) on hospital readmission after common surgical procedures. SUMMARY BACKGROUND DATA: Hospital readmissions following surgery lead to worse patient outcomes and wasteful spending. ACOs, and their associated hospitals, have strong incentives to reduce readmissions from 2 distinct Centers for Medicare and Medicaid Services policies. METHODS: We performed a retrospective cohort study using a 20% national Medicare sample to identify beneficiaries undergoing 1 of 7 common surgical procedures-abdominal aortic aneurysm repair, colectomy, cystectomy, prostatectomy, lung resection, total knee arthroplasty, and total hip arthroplasty-between 2010 and 2014...
March 19, 2018: Annals of Surgery
Uros Marusic, Sidney Grosprêtre
Normal and pathological ageing are associated with several motor impairments that reduce quality of life and represent a general challenge for public healthcare systems. Consequently, over the past decades, many scientists and physiotherapists dedicated their research to the development and improvement of safe and costless methods to counteract the progressive decline of motor functions with age. The urgency of finding new and easy to implement methods is even more paramount in case of acute pathologies (e...
March 20, 2018: European Journal of Sport Science
Peter G Passias, Samantha R Horn, Nicholas J Frangella, Gregory W Poorman, Dennis Vasquez-Montes, Bassel G Diebo, Cole A Bortz, Frank A Segreto, John Y Moon, Peter L Zhou, Shaleen Vira, Akhila Sure, Bryan Beaubrun, Jared C Tishelman, Subaraman Ramchandran, Cyrus M Jalai, Wesley Bronson, Charles Wang, Virginie Lafage, Aaron J Buckland, Thomas J Errico
BACKGROUND: Prior studies have built a foundation for understanding compensation in adult spinal deformity (ASD) patients using full-body stereographic assessments. These mechanisms, in relation to age-adjusted alignment targets, have yet to be fully studied. The aim of this study is to assess lower limb compensatory mechanisms of patients failing to meet age-adjusted alignment goals. METHODS: ASD patients >40 y/o with full body baseline and follow-up radiographs were included...
March 16, 2018: World Neurosurgery
Julie A Neumann, Renee S Greene, Michael B Banffy
Ligamentum teres (LT) tears are a pathologic condition being identified at increasing frequency because of growing use of hip arthroscopy. The exact role of the LT is not well understood, but it has been shown in recent biomechanical studies to contribute to hip stability. Patients with hip pain, instability, and/or mechanical symptoms with advanced imaging findings showing LT pathology may benefit from an LT augmentation. We present an arthroscopic-assisted LT augmentation technique, which can be performed as an isolated procedure or in conjunction with an arthroscopic labral repair and/or debridement, chondroplasty, and femoroplasty...
January 2018: Arthroscopy Techniques
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...
March 17, 2018: British Journal of Sports Medicine
Assem A Sultan, Anton Khlopas, Inyang Udo-Inyang, Morad Chughtai, Nipun Sodhi, Suela Lamaj, Roland Starr, Nicolas S Piuzzi, Anil Bhave, Michael A Mont
INTRODUCTION: Changes in pelvic position has been shown to affect acetabular coverage of the femoral head in total hip arthroplasty (THA) and may contribute to complications such as impingement, dislocation, or early wear. Understanding the kinematic changes of these positions during functional activities may help surgeons reach a consensus regarding stable hip mechanics and ideal implant positioning in THA. Therefore, in this study, we aimed to evaluate the following in patients who had unilateral hip OA: 1) dynamic changes; and 2) variability; in the following pelvic position parameters: A) tilt; B) obliquity; and C) rotation standing position to walking...
March 16, 2018: Surgical Technology International
Ditte Beck Jepsen, Jesper Ryg, Niklas Rye Jørgensen, Stinus Hansen, Tahir Masud
BACKGROUND: PaVOS is a randomized controlled trial (RCT) which aims to address the use of whole-body vibration exercise (WBV) in combination with parathyroid hormone 1-34 fragment teriparatide (PTH 1-34) treatment in patients with osteoporosis. PTH 1-34 is an effective but expensive anabolic treatment for osteoporosis. WBV has been found to stimulate muscle and bone growth. Animal studies have shown a beneficial effect on bone when combining PTH 1-34 with mechanical loading. A combined treatment with PTH 1-34 and WBV may potentially have beneficial effects on bone and muscles, and reduce fracture risk...
March 16, 2018: Trials
Marcie Harris-Hayes, Karen Steger-May, Linda R Van Dillen, Mario Schootman, Gretchen B Salsich, Sylvia Czuppon, John C Clohisy, Paul K Commean, Travis J Hillen, Shirley A Sahrmann, Michael J Mueller
Study Design Ancillary analysis, time-controlled randomized clinical trial. Background Movement pattern training (MPT) has been shown to improve function among patients with chronic hip joint pain (CHJP). Objective Determine the association among treatment outcomes and mechanical factors associated with CHJP. Methods Twenty-eight patients with CHJP, 18-40 years, participated in MPT, either immediately after assessment or after a wait-list period. MPT included task-specific training to reduce hip adduction motion during functional tasks and hip muscle strengthening...
March 16, 2018: Journal of Orthopaedic and Sports Physical Therapy
Laura Wallard, Sophie Boulet, Olivier Cornu, Jean-Emile Dubuc, Philippe Mahaudens, Didier Postlethwaite, Maïté Van Cauter, Christine Detrembleur
BACKGROUND: The gait mechanism requires an efficient intersegmental coordination in order to ensure the displacement of the body while simultaneously maintaining the postural stability. However, intersegmental coordination may be disrupted by neurological or orthopaedic involvement, this increasing the metabolic cost associated with excessive or prolonged muscle co-contraction. RESEARCH QUESTION: Our aim was to evaluate and to understand how hip OA affects lower limbs coordination during gait by using the kinematic segmental covariation law method and predict the energy expenditure...
March 7, 2018: Gait & Posture
Jae Hong Lee, Dong Ki Min, Han Seong Choe, Jin Hwan Lee, So Hong Shin
[Purpose] The purpose of this study was to evaluate the influence of arm and leg posture elements on symmetrical weight bearing during Sit to Stand tasks in chronic stroke patients. [Subjects and Methods] The subjects were diagnosed with stroke and 22 patients (15 males and 7 females) participated in this study. All participants performed Sit to Stand tasks on three foot postures and two arm postures. Two force plates were used to measure peak of vertical ground reaction force and symmetrical ratio to peak Fz...
February 2018: Journal of Physical Therapy Science
Gilda Fazzari, Merylin Zizza, Anna Di Vito, Raffaella Alò, Maria Mele, Rosalinda Bruno, Barni Tullio, Rosa Maria Facciolo, Canonaco Marcello
Recent indications are suggesting that high fat and sugar-enriched foods do not only evoke harmful physiological conditions, but they also endure evident structural alterations in cerebral regions controlling cognitive and feeding behaviors. Food consumption plus neuronal energy regulatory mechanisms seem to constitute a complex system assuring that food calories do not exceed body requirements. At the same time obesogenic-related properties of limbic feeding stations like the hypothalamus (HTH), hippocampus (HIP) and amygdala (AMY) tend to control eating habits through the interaction of distinct neuropeptides...
March 12, 2018: Behavioural Brain Research
Jinkyu Lee, Yongnam Song, Choongsoo S Shin
BACKGROUND: During landing, the ankle angle at initial contact (IC) exhibits relatively wide individual variation compared to the knee and hip angles. However, little is known about the effect of different IC ankle angles on energy dissipation. RESEARCH QUESTION: The purpose of this study was to investigate the relationship between individual ankle angles at IC and energy dissipation in the lower extremity joints. METHODS: Twenty-seven adults performed single-leg landings from a 0...
March 7, 2018: Gait & Posture
Jocelyn F Hafer, Katherine A Boyer
BACKGROUND: Aging is associated with a loss of mobility and altered gait mechanics. Loss of function and mobility may be due to or exacerbated by low levels of physical activity in the aged. The mechanisms linking age-related changes in physiology, altered mobility and gait may be elucidated by examining movement coordination and coordination variability. RESEARCH QUESTION: The purpose of this study was to examine the impacts of age and habitual physical activity level on segment coordination and coordination variability during gait...
February 26, 2018: Gait & Posture
Benjamin S Killen, Krista L Zelizney, Xin Ye
CONTEXT: Static stretching (SS) and self-administered foam rolling (SAFR) are both effective techniques often used in rehabilitation settings to improve one's range-of-motion (ROM). However, their effects on non-intervened contralateral limb's performance remain equivocal. OBJECTIVE: To examine the acute effects of unilateral hamstrings SS and SAFR on the contralateral hip flexion passive ROM and the strength performance. DESIGN: Randomized crossover trial...
March 15, 2018: Journal of Sport Rehabilitation
Alexandra DeJong, L Colby Mangum, Jacob Resch, Susan A Saliba
CONTEXT: Medial knee displacement (MKD) is a common risk factor for lower extremity injury and is related to altered gluteal muscle activity. Ultrasound imaging (USI) is a reliable means to explore mechanical muscle activity, however no information exists regarding USI of the gluteals during gait in a MKD population. OBJECTIVE: To determine differences in USI gluteal muscle activity during gait in individuals with and without MKD. DESIGN: Descriptive laboratory study...
March 15, 2018: Journal of Sport Rehabilitation
Hidetoshi Hamada, Masaki Takao, Takashi Sakai, Nobuhiko Sugano
PURPOSE: For successful joint preservation in osteonecrosis of the femoral head (ONFH), it is important to understand the mechanism of collapse. The purpose of this study was to investigate the initiation of subchondral fracture in ONFH by using micro-CT imaging of the whole femoral head, focusing on the three-dimensional relationship between the subchondral fracture and the bone resorption area. METHODS: A total of 40 femoral heads from 37 patients retrieved during total hip arthroplasty for stage 3A or 3B ONFH by Japanese Investigation Committee criteria were scanned using micro-CT with a 0...
March 14, 2018: International Orthopaedics
Michael Sobieraj, Scott Marwin
Total joint arthroplasty of the hip and knee are successful orthopedic procedures that reduce pain and improve mobility in patients. As the implanted materials used in these procedures have improved, the lifetime of the implants has now reached more than 20 years. Younger patients are undergoing total joint arthroplasty at increasing rates, which has increased the need for improvements in materials for extended implant longevity. In this review, we aim to provide historical perspective on the evolution of ultra-high-molecular-weight polyethylene in total joint arthroplasty...
March 2018: Bulletin of the Hospital for Joint Diseases
De-Xin Wang, Fang-Gui Sun, Rui Liu, Da-Cheng Li, Yu-Tong Hu, Rong-Ming Xu
Transient osteoporosis of the hip(TOH) is classified as a type of bone marrow edema syndrome. TOH is lack of previous study and there is still controversy about his pathogenesis. In recent years, with the development of multi-discipline, such as imaging, pathology, molecular biology, the study has found that the pathological mechanism is complex, while its mechanism is still not clear, which need further research. This paper summarizes the research progress on the pathogenesis of TOH from neurogenic, osteonecrosis, abnormal vascular function, subchondral fracture, heredity and regional acceleration and son on...
February 25, 2018: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
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