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https://www.readbyqxmd.com/read/27914627/comparison-of-in-vivo-measured-loads-in-knee-hip-and-spinal-implants-during-level-walking
#1
Philipp Damm, Ines Kutzner, Georg Bergmann, Antonius Rohlmann, Hendrik Schmidt
Walking is a task that we seek to understand because it is the most relevant human locomotion. Walking causes complex loading patterns and high load magnitudes within the human body. This work summarizes partially published load data collected in earlier in vivo measurement studies on 9 patients with telemeterized knee endoprostheses, 10 with hip endoprostheses and 5 with vertebral body replacements. Moreover, for the 19 endoprosthesis patients, additional simultaneously measured and previously unreported ground reaction forces are presented...
November 28, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27913813/-rehabilitation-after-hip-and-knee-endoprosthetic-treatment-in-the-elderly
#2
H Bork
Due to current demographic developments with a continuous increase in average life expectancy and improved medical treatment, the number of elderly patients with joint replacement of the lower extremities also has increased in recent years. Most of these patients have not only one but several chronic diseases requiring treatment and medication. Drug-drug interaction and functional restrictions of the elderly additionally reduce the postoperative psychophysical capacity; therefore, special knowledge in rehabilitative treatment and pain management is necessary...
December 2, 2016: Der Orthopäde
https://www.readbyqxmd.com/read/27912753/radiographic-evaluation-of-early-periprosthetic-acetabular-bone-contrast-and-prosthetic-head-acetabular-coverage-after-uncemented-and-cemented-total-hip-prosthesis-in-dogs
#3
Ayman A Mostafa, Karin Lucas, Ingo Nolte, Patrick Wefstaedt
BACKGROUND: Coxofemoral osteoarthritis is a chronic, disabling condition affecting people and dogs, with THA providing an excellent return to function in severely affected joints. The principal role of THA is to restore an adequate range of motion to the hip joint while transferring load from the acetabulum in order to improve the survival of the implant and enhance the limb function in the short and long terms. The objectives of the study reported here were, therefore, to radiographically evaluate periprosthetic acetabular bone GV and to assess prosthetic head acetabular coverage after 4 months of uncemented and cemented THA in dogs...
December 3, 2016: BMC Veterinary Research
https://www.readbyqxmd.com/read/27912747/the-three-dimensional-kinematics-and-spatiotemporal-parameters-of-gait-in-6-10-year-old-typically-developed-children-in-the-cape-metropole-of-south-africa-a-pilot-study
#4
Yvonne Smith, Quinette Louw, Yolandi Brink
BACKGROUND: Functional gait is an integral part of life, allowing individuals to function within their environment and participate in activities of daily living. Gait assessment forms an essential part of a physical examination and can help screen for physical impairments. No three-dimensional (3D) gait analysis studies of children have been conducted in South Africa. South African gait analysis laboratory protocols and procedures may differ from laboratories in other countries, therefore a South African data base of normative values is required to make a valid assessment of South African children's gait...
December 3, 2016: BMC Pediatrics
https://www.readbyqxmd.com/read/27912168/tensor-resolved-raman-spectroscopic-analysis-of-wear-induced-residual-stress-fields-in-long-term-alumina-hip-joint-retrievals
#5
Wenliang Zhu, Elia Marin, Nobuhiko Sugano, Giuseppe Pezzotti
Polarized Raman spectroscopy was applied to evaluate the full set of stress tensor components in the wear-induced residual stress fields on two long-term (>20 y) (monolithic) alumina (Al2O3) femoral head retrievals coupled to polyethylene liners. The tensor-resolved residual stress state stored onto the Al2O3 ceramic head surface was found to retain "memory" of the sliding conditions in vivo and of the wear-induced consumption of the polyethylene counterpart. The evolution of tensor-resolved residual stress motifs in the three-dimensional space was examined, and key features, including exceptionally high shear stresses in one case, were uncovered...
November 20, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27911455/functional-outcomes-of-infected-hip-arthroplasty-a-comparison-of-different-surgical-treatment-options
#6
Benjamin V Herman, Mark Nyland, Lyndsay Somerville, Steven J MacDonald, Brent A Lanting, James L Howard
BACKGROUND: Periprosthetic joint infection (PJI) following total hip arthroplasty (THA) can be treated with irrigation and debridement with head and polyethylene exchange (IDHPE) or 2-stage revision (2SR). Few studies have compared patient-reported outcome measures (PROMs) in patients managed with these treatments. METHODS: A retrospective review identified 137 patients who had an infected primary THA between 1986-2013. Control cohorts were matched according to age and Charlton Comorbidity Index (CCI)...
November 28, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27910817/on-the-molecular-interaction-between-femoral-heads-and-polyethylene-liners-in-artificial-hip-joints-phenomenology-and-molecular-scale-phenomena
#7
Giuseppe Pezzotti, B Sonny Bal, Elisa Casagrande, Nobuhiko Sugano, Bryan J McEntire, Wenliang Zhu, Leonardo Puppulin
The chemical interaction of femoral heads with polyethylene liners is an important new area of research in total hip arthroplasty (THA) as a consequence of an unabating quest for elongated artificial joint lifetimes. It is a topic that goes beyond simple mechanical behavior or wear. It seeks to describe the prosthetic device as a whole by adding chemical considerations to mechanics and abrasion. One of the poorly understood chemical interactions is oxygen affinity of the femoral heads. While oxygen unavoidably diffuses into the non-crystalline enclaves of the polyethylene liner as a result of its contact with the tribolayer, a ceramic femoral head can either attract or release oxygen due to its tribochemical interactions...
December 2, 2016: Biomedical Materials
https://www.readbyqxmd.com/read/27909667/arthroscopic-capsular-reconstruction-of-the-hip-with-acellular-dermal-extracellular-matrix-surgical-technique
#8
Itay Perets, David E Hartigan, John P Walsh, Edwin Chaharbakhshi, Mary R Close, Benjamin G Domb
Atraumatic instability of the hip has become an increasingly studied occurrence in recent years. There are several established surgical techniques that help restore stability of the native hip joint. In some cases, these procedures are not an option. As the phenomenon has become recognized more frequently, a greater number of revision surgeries are warranted in patients with ligamentous laxity. A durable solution for irreparable microinstability needs to be formulated to address this vulnerable patient demographic...
October 2016: Arthroscopy Techniques
https://www.readbyqxmd.com/read/27909663/the-quebec-city-slider-a-technique-for-capsular-closure-and-plication-in-hip-arthroscopy
#9
Travis J Menge, Jorge Chahla, Eduardo Soares, Justin J Mitchell, Marc J Philippon
Biomechanical and clinical studies have shown that the hip joint capsule plays an important role in maintaining stability and hip mechanics, including rotation and translation. The recent literature has shown that capsule closure after hip arthroscopy helps to restore stability. Without restoration of the native anatomy, the hip joint may translate when patients engage in activities that place force across the hip, leading to either microinstability or frank dislocation. The purpose of this note is to describe our preferred technique of capsular closure or plication during hip arthroscopy...
October 2016: Arthroscopy Techniques
https://www.readbyqxmd.com/read/27909136/errata
#10
(no author information available yet)
Tranexamic acid reduces blood loss in patients with extracapsular fractures of the hip. Bone Joint J 2016;98-B:747-753.
December 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27909123/comparative-study-of-computer-assisted-total-knee-arthroplasty-after-opening-wedge-osteotomy-versus-after-unicompartmental-arthroplasty
#11
R Pailhé, J Cognault, J Massfelder, A Sharma, R-C Rouchy, B Rubens-Duval, D Saragaglia
AIMS: The role of high tibial osteotomy (HTO) is being questioned by the use of unicompartmental knee arthroplasty (UKA) in the treatment of medial compartment femorotibial osteoarthritis. Our aim was to compare the outcomes of revision HTO or UKA to a total knee arthroplasty (TKA) using computer-assisted surgery in matched groups of patients. PATIENTS AND METHODS: We conducted a retrospective study to compare the clinical and radiological outcome of patients who underwent revision of a HTO to a TKA (group 1) with those who underwent revision of a medial UKA to a TKA (group 2)...
December 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27909122/femoral-impaction-bone-grafting-in-revision-hip-arthroplasty-705-cases-from-the-originating-centre
#12
M J Wilson, S Hook, S L Whitehouse, A J Timperley, G A Gie
AIMS: Femoral impaction bone grafting was first developed in 1987 using morselised cancellous bone graft impacted into the femoral canal in combination with a cemented, tapered, polished stem. We describe the evolution of this technique and instrumentation since that time. PATIENTS AND METHODS: Between 1987 and 2005, 705 revision total hip arthroplasties (56 bilateral) were performed with femoral impaction grafting using a cemented femoral stem. All surviving patients were prospectively followed for a mean of 14...
December 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27909121/the-rate-of-wear-of-second-generation-highly-crosslinked-polyethylene-liners-five-years-post-operatively-does-not-increase-if-large-femoral-heads-are-used
#13
S A Callary, J R Field, D G Campbell
AIMS: The increased in vivo resistance to wear of highly crosslinked polyethylene (HXLPE) in total hip arthroplasty (THA) has led to an increased use of larger articulations which have been shown to reduce the incidence of early dislocation. To date, there are few reports of the wear of larger articulations using second generation HXLPE liners. Our prospective cohort study measured the bedding-in and early wear of large (36 mm and 40 mm diameter) articulations involving a second generation X3 HXLPE liner and compared our findings with previous clinical and in vitro studies of the same material...
December 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27909120/restoration-of-the-centre-of-rotation-in-primary-total-hip-arthroplasty-the-influence-of-acetabular-floor-depth-and-reaming-technique
#14
G Meermans, J Van Doorn, J-J Kats
AIMS: One goal of total hip arthroplasty is to restore normal hip anatomy. The aim of this study was to compare displacement of the centre of rotation (COR) using a standard reaming technique with a technique in which the acetabulum was reamed immediately peripherally and referenced off the rim. PATIENTS AND METHODS: In the first cohort the acetabulum was reamed to the floor followed by sequentially larger reamers. In the second cohort the acetabulum was only reamed peripherally, starting with a reamer the same size as the native femoral head...
December 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27909119/impact-of-a-learning-curve-on-the-survivorship-of-4802-cementless-total-hip-arthroplasties
#15
P Magill, J Blaney, J C Hill, M P Bonnin, D E Beverland
AIMS: Our aim was to report survivorship data and lessons learned with the Corail/Pinnacle cementless total hip arthroplasty (THA) system. PATIENTS AND METHODS: Between August 2005 and March 2015, a total of 4802 primary cementless Corail/Pinnacle THAs were performed in 4309 patients. In March 2016, we reviewed these hips from a prospectively maintained database. RESULTS: A total of 80 hips (1.67%) have been revised which is equivalent to a cumulative risk of revision of 2...
December 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27909118/the-relative-contribution-of-the-medial-and-lateral-femoral-circumflex-arteries-to-the-vascularity-of-the-head-and-neck-of-the-femur-a-quantitative-mri-based-assessment
#16
D C Dewar, L E Lazaro, C E Klinger, P K Sculco, J P Dyke, A Y Ni, D L Helfet, D G Lorich
AIMS: We aimed to quantify the relative contributions of the medial femoral circumflex artery (MFCA) and lateral femoral circumflex artery (LFCA) to the arterial supply of the head and neck of the femur. MATERIALS AND METHODS: We acquired ten cadaveric pelvises. In each of these, one hip was randomly assigned as experimental and the other as a matched control. The MFCA and LFCA were cannulated bilaterally. The hips were designated LFCA-experimental or MFCA-experimental and underwent quantitative MRI using a 2 mm slice thickness before and after injection of MRI-contrast diluted 3:1 with saline (15 ml Gd-DTPA) into either the LFCA or MFCA...
December 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27909117/when-is-the-ideal-time-to-operate-on-a-patient-with-a-fracture-of-the-hip-a-review-of-the-available-literature
#17
REVIEW
P M Lewis, J P Waddell
Fractures of the hip are common, often occurring in frail elderly patients, but also in younger fit healthy patients following trauma. They have a significant associated mortality and major social and financial implications to patients and health care providers. Many guidelines are available for the management of these patients, mostly recommending early surgery for the best outcomes. As a result, healthcare authorities now put pressure on surgical teams to 'fast track' patients with a fracture of the hip, often misquoting the available literature, which in itself can be confusing and even conflicting...
December 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27905876/age-and-sex-specific-associations-of-anthropometric-measures-of-adiposity-with-blood-pressure-and-hypertension-in-india-a-cross-sectional-study
#18
Kevin Y Taing, Michael E Farkouh, Rahim Moineddin, Jack V Tu, Prabhat Jha
BACKGROUND: A determinant of blood pressure is adiposity; however, there are uncertainties surrounding whether general or central adiposity is the more important determinant of blood pressure. Further, inconsistent results exist for the relationships of anthropometric measures with blood pressure and hypertension, and whether these relationships differ substantially by age and sex is unclear. We aimed to elucidate the associations of anthropometric measures of general and central adiposity with blood pressure and hypertension, and determine the effect of age and sex on these relationships...
December 1, 2016: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/27905865/transient-bone-marrow-edema-syndrome-versus-osteonecrosis-perfusion-patterns-at-dynamic-contrast-enhanced-mr-imaging-with-high-temporal-resolution-can-allow-differentiation
#19
Tobias Geith, Thomas Niethammer, Stefan Milz, Olaf Dietrich, Maximilian Reiser, Andrea Baur-Melnyk
Purpose To prospectively evaluate the perfusion patterns at quantitative dynamic contrast material-enhanced (DCE) magnetic resonance (MR) imaging of transient bone marrow edema syndrome (TBMES) and avascular osteonecrosis. Materials and Methods Institutional review board approval and written informed consent were obtained. Thirty-two patients (21 men, 11 women; mean age, 48 years; 26 hips, 10 knees) underwent conventional MR imaging and a dynamic contrast-enhanced three-dimensional spoiled gradient-echo sequence at 3 T...
December 1, 2016: Radiology
https://www.readbyqxmd.com/read/27905187/no-clinically-meaningful-weight-changes-in-a-young-cohort-following-total-joint-arthroplasty-at-3-year-follow-up
#20
Peter M Formby, Richard L Purcell, Michael Baird, Matthew Wagner, Ronald P Goodlett, Andrew W Mack
BACKGROUND: Total joint arthroplasty (TJA) is one of the most successful operations. There is little in the literature regarding weight change following TJA, particularly in a young cohort. METHODS: Retrospective analysis of 181 primary total hip arthroplasty (THA) and 185 primary total knee arthroplasty (TKA) patients was conducted. We reviewed preoperative and post-operative weights and post-operative body mass index at 3 and 6 months, 1 year, 2 and 3 years...
November 30, 2016: ANZ Journal of Surgery
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