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hip biomechanics

Riccardo Gottardi, Uwe Hansen, Roberto Raiteri, Marko Loparic, Marcel Düggelin, Daniel Mathys, Niklaus F Friederich, Peter Bruckner, Martin Stolz
Cartilage matrix is a composite of discrete, but interacting suprastructures, i.e. cartilage fibers with microfibrillar or network-like aggregates and penetrating extrafibrillar proteoglycan matrix. The biomechanical function of the proteoglycan matrix and the collagen fibers are to absorb compressive and tensional loads, respectively. Here, we are focusing on the suprastructural organization of collagen fibrils and the degradation process of their hierarchical organized fiber architecture studied at high resolution at the authentic location within cartilage...
2016: PloS One
Bo-Kyu Yang, Seung-Rim Yi, Young-Joon Ahn, Se-Hyuk Im, Sang-Hyun Park
Fatigue fracture of the pelvis is the form of fracture due to repetitive micro-stress accumulation, can be affected by a number of factors such as patient's nutritional status, biomechanics, social status and so on. Still there is no study about precise standard degree of external force that lead to stress fracture, but it may caused by compression force, traction force or complex force and others. Avulsion stress to ischial tuberosity or anterior superior iliac spine by attached muscle is known as the main factor for the avulsion fracture...
September 2016: Hip Pelvis
Daniel J Southwell, Shane A Petersen, Tyson A C Beach, Ryan B Graham
Altering footwear worn during performance of the barbell back squat has been shown to change motion patterns, but it is not completely understood how this affects biomechanical loading demands. The primary objective was to compare lower back and extremity net joint moments in 24 experienced weightlifters (12M, 12F) who performed 80% one-repetition maximum back squats under three different footwear conditions (barefoot, running shoes, weightlifting shoes). Results showed that there was a significant main effect of footwear condition on the knee extension moment (p=0...
October 12, 2016: Journal of Electromyography and Kinesiology
Mohammed A Zwawi, Faissal A Moslehy, Christopher Rose, Victor Huayamave, Alain J Kassab, Eduardo Divo, Brendan J Jones, Charles T Price
: This study utilized a computational biomechanical model and applied the least energy path principle to investigate two pathways for closed reduction of high grade infantile hip dislocation. The principle of least energy when applied to moving the femoral head from an initial to a final position considers all possible paths that connect them and identifies the path of least resistance. Clinical reports of severe hip dysplasia have concluded that reduction of the femoral head into the acetabulum may occur by a direct pathway over the posterior rim of the acetabulum when using the Pavlik harness, or by an indirect pathway with reduction through the acetabular notch when using the modified Hoffman-Daimler method...
October 20, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
Sylwia Szotek, Joanna Dawidowicz, Brian Eyden, Natalia Matysiak, Aleksander Czogalla, Grzegorz Dudzik, Anna Leśniewicz, Krzysztof Maksymowicz
Fascia lata is an important element of the fascial system, which forms the continuum of connective tissue throughout the body. This deep fascia envelops the entire thigh and hip area and its main function is to transmit mechanical forces generated by the musculoskeletal system of the lower extremities. Fascia lata is also known as a useful and easily harvested graft material. Despite its crucial role in lower extremity biomechanics and wide-ranging applications in plastic and reconstructive surgery, both the structure of fascia lata and particularly the cells populating this tissue are relatively unexplored and therefore poorly understood...
October 20, 2016: Ultrastructural Pathology
Carolina Souza Neves da Costa, Sandra L Saavedra, Nelci Adriana Cicuto Ferreira Rocha, Marjorie H Woollacott
BACKGROUND: External support has been viewed as an important biomechanical constraint for children with deficits in postural control. Nonlinear analysis of head stability is necessary to confirm benefits of interaction between external trunk support and level of trunk control. OBJECTIVE: To compare the effect of biomechanical constraints (trunk support) on neural control of head stability during development of trunk control. DESIGN: Quasi-experimental repeated measure study...
October 6, 2016: Physical Therapy
Jay R Ebert, Theertha Retheesh, Rinky Mutreja, Gregory C Janes
BACKGROUND: Hip abductor tendon (HAT) tearing is commonly implicated in greater trochanteric pain syndrome (GTPS), though limited information exists on the disability associated with this condition and specific presentation of these patients. PURPOSE: To describe the clinical, functional and biomechanical presentation of patients with symptomatic HAT tears. Secondary purposes were to investigate the association between these clinical and functional measures, and to compare the pain and disability reported by HAT tear patients to those with end-stage hip osteoarthritis (OA)...
October 2016: International Journal of Sports Physical Therapy
Karl Stoffel, Ivan Zderic, Florian Gras, Christoph Sommer, Ursula Eberli, David Mueller, Martin Oswald, Boyko Gueorguiev
OBJECTIVES: To evaluate the biomechanical performance of Femoral Neck System (FNS) in comparison to established methods for fixation of femoral neck fractures in a cadaveric model. METHODS: Twenty pairs of fresh-frozen human cadaveric femora were instrumented either with DHS-Screw, DHS-Blade, 3CS or with FNS in a partially paired design. The specimens were randomized to two paired treatment groups based on the BMD, namely DHS-Screw/DHS-Blade and FNS/3CS. A reduced unstable femoral neck fracture with postero-caudal comminution, AO/OTA 31-B2...
October 13, 2016: Journal of Orthopaedic Trauma
Mark W Creaby, Conor Honeywill, Melinda M Franettovich Smith, Anthony G Schache, Kay M Crossley
PURPOSE: Achilles tendinopathy (AT) is a prevalent injury in running sports. Understanding the biomechanical factors associated with AT will assist in its management and prevention. The purpose of this study was to compare hip and ankle kinematics and kinetics in runners with and without AT. METHODS: Fourteen male runners with AT and eleven healthy male runners (CTRL) ran over-ground whilst lower-limb joint motion and ground reaction force data were synchronously captured...
October 17, 2016: Medicine and Science in Sports and Exercise
Bhupinder Singh, Huy Vo, Shelby L Francis, Kathleen F Janz, John H Yack
PURPOSE: This study assessed the biomechanical gait changes in obese and normal weight female adult subjects following a commonly recommended 30-minute walking session. Hip and knee adduction and extensor moments, which are the primary modulators of frontal and sagittal plane load distribution were hypothesized to increase in obese females following a 30-minute walking period, resulting in more stress across the hip and knee joint. METHODS: Ten obese (37.7 ± 4...
October 6, 2016: Medicine and Science in Sports and Exercise
E K Greska, N Cortes, S I Ringleb, J A Onate, B L Van Lunen
Previous studies have shown conflicting information regarding leg dominance as an etiological factor for the risk of anterior cruciate ligament (ACL) injuries. It remains unclear if lower extremity neuromechanical limb asymmetries exist in experienced athletes. The purpose of this study was to evaluate lower extremity neuromechanical effects of leg dominance in female collegiate soccer athletes during an unanticipated side-step cutting task. Twenty female collegiate soccer players completed an unanticipated side-step cutting task, using their dominant and non-dominant legs...
October 17, 2016: Scandinavian Journal of Medicine & Science in Sports
Michael A Samaan, Benedikt J Schwaiger, Matthew C Gallo, Thomas M Link, Alan L Zhang, Sharmila Majumdar, Richard B Souza
BACKGROUND: Femoroacetabular impingement (FAI) is a morphological abnormality of the hip joint that causes pain when performing a mechanically demanding activity of daily living such as the sit-to-stand (STS) task. Previous studies have assessed lower extremity joint mechanics during a STS task in various pathologies yet the STS task has not been studied in FAI patients. OBJECTIVE: To identify differences in joint kinetics and performance between FAI patients and healthy controls during a STS task...
October 8, 2016: PM & R: the Journal of Injury, Function, and Rehabilitation
Brandon R Bukowski, Paul Anderson, Anton Khlopas, Morad Chughtai, Michael A Mont, Richard Ii L Illgen
INTRODUCTION: Functional outcome following total hip arthroplasty (THA) is affected by accurate component positioning and restoration of hip biomechanics. Robotic-assisted THA (rTHA) has been shown to improve accuracy of component positioning, but its impact on functional outcomes has not been demonstrated. The purpose of this study was to compare: 1) operative time; 2) estimated blood loss; 3) postoperative complications; and 4) patient-reported outcome measures (PROMs) between patients who either underwent rTHA or manual THA (mTHA)...
October 6, 2016: Surgical Technology International
Ssu-Yu Chang, Yi-Jia Lin, Wei-Chun Hsu, Lin-Fen Hsieh, Yuan-Hsiang Lin, Chao-Chin Chang, You-Cai Chou, Li-Fei Chen
Six female patients with bilateral medial knee OA and 6 healthy controls were recruited. Patients with knee OA received a 6-week physiotherapist-supervised and home-based exercise program. Outcome measures, including the Western Ontario and McMaster Universities Arthritis Index and Short Form-36 Health Survey as well as objective biomechanical indices were obtained at baseline and follow-up. After treatment, no significant difference was observed in the knee abductor moment (KAM), lever arm, and ground reaction force...
2016: BioMed Research International
Dongxu Liu, Zikai Hua, Xinyi Yan, Zhongmin Jin
A pelvic endoprosthesis is commonly used in orthopedic surgeries to reconstruct the pelvis after internal hemipelvectomy. This study presents the detailed design of a novel type I+II+III adjustable hemipelvic prosthesis based on the geometrical features of massive human pelvises. Finite element analysis is conducted to estimate the biomechanical performance of the newly designed adjustable hemipelvic prosthesis. Detailed numerical models of the natural and reconstructed pelvises including related soft tissues are developed...
October 6, 2016: Medical Engineering & Physics
Hal D Martin, Anthony N Khoury, Ricardo Schröder, Eric Johnson, Juan Gómez-Hoyos, Salvador Campos, Ian J Palmer
PURPOSE: To determine the isolated function of the pubofemoral ligament of the hip capsule and its contribution to hip stability in external/internal rotational motion during flexion greater than 30° and abduction. METHODS: Thirteen hips from 7 fresh-frozen pelvis-to-toe cadavers were skeletonized from the lumbar spine to the distal femur with the capsular ligaments intact. Computed tomographic imaging was performed to ensure no occult pathological state existed, and assess bony anatomy...
October 5, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
Mark Lenz, Karl Stoffel, Heike Kielstein, Keith Mayo, Gunther O Hofmann, Boyko Gueorguiev
INTRODUCTION: Proximal plate fixation in periprosthetic femur fractures can be improved by plate anchorage in the greater trochanter (lateral tension band principle) or bicortical locking screw placement beside the prosthesis stem in an embracement configuration. Both concepts were compared in a biomechanical test using a femoral hook plate (hook) or a locking attachment plate (LAP). METHODS: After bone mineral density (BMD) measurement in the greater trochanter, six pairs of fresh frozen human femora were assigned to two groups and instrumented with cemented hip endoprostheses...
September 30, 2016: Injury
R Grunert, S Schleifenbaum, R Möbius, G Sommer, D Zajonz, N Hammer, T Prietzel
Background: In total hip arthroplasty (THA), femoral head diameter has not been regarded as a key parameter which should be restored when reconstructing joint biomechanics and geometry. Apart from the controversial discussion on the advantages and disadvantages of using larger diameter heads, their higher cost is another important reason that they have only been used to a limited extent. The goal of this study was to analyse the price structure of prosthetic heads in comparison to other components used in THA...
October 7, 2016: Zeitschrift Für Orthopädie und Unfallchirurgie
Xuyi Wang, Jianping Peng, De Li, Linlin Zhang, Hui Wang, Leisheng Jiang, Xiaodong Chen
BACKGROUND: The success of Bernese periacetabular osteotomy depends significantly on how extent the acetabular fragment can be corrected to its optimal position. This study was undertaken to investigate whether correcting the acetabular fragment into the so-called radiological "normal" range is the best choice for all developmental dysplasia of the hip with different severities of dysplasia from the biomechanical view? If not, is there any correlation between the biomechanically optimal position of the acetabular fragment and the severity of dysplasia? METHODS: Four finite element models with different severities of dysplasia were developed...
October 4, 2016: Journal of Orthopaedic Surgery and Research
M C Koper, N M C Mathijssen, F Witt, M M Morlock, S B W Vehmeijer
BACKGROUND: Metal-on-Metal (MoM) total hip arthroplasties (THA) are associated with pseudotumor formation and high revision rates. This prospective study analysed the clinical and wear analyses of 9 large Metal-on-Metal (MoM) total hip arthroplasties (THA) to understand the underlying mechanisms of failure. The MoM bearings were revised for multiple reasons; the main reason was pseudotumor formation. MATERIALS AND METHODS: From 2006 till 2010 the Reinier de Graaf Hospital implanted 160 large head M2a-Magnum™ (Biomet Inc...
2016: PloS One
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