keyword
MENU ▼
Read by QxMD icon Read
search

Tibia geometry

keyword
https://www.readbyqxmd.com/read/29801179/in-vivo-tibial-fit-and-rotational-analysis-of-a-customized-patient-specific-tka-versus-off-the-shelf-tka
#1
Lennart Schroeder, Gregory Martin
In total knee arthroplasty (TKA), surgeons often face the decision of maximizing tibial component fit and achieving correct rotational alignment at the same time. Customized implants (CIMs) address this difficulty by aiming to replicate the anatomical joint structure, utilizing data from patient-specific knee geometry during the manufacturing. We intraoperatively compared component fit in four tibial zones of a CIM to that of three different off-the-shelf (OTS) TKA designs in 44 knees. Additionally, we assessed the rotational alignment of the tibia using computed tomography (CT)-based computer aided design model analysis...
May 25, 2018: Journal of Knee Surgery
https://www.readbyqxmd.com/read/29800691/relative-contributions-of-lean-and-fat-mass-to-bone-strength-in-young-hispanic-and-non-hispanic-girls
#2
Megan Hetherington-Rauth, Jennifer W Bea, Robert M Blew, Janet L Funk, Melanie D Hingle, Vinson R Lee, Denise J Roe, Mark D Wheeler, Timothy G Lohman, Scott B Going
BACKGROUND: With the high prevalence of childhood obesity, especially among Hispanic children, understanding how body weight and its components of lean and fat mass affect bone development is important, given that the amount of bone mineral accrued during childhood can determine osteoporosis risk later in life. The aim of this study was to assess the independent contributions of lean and fat mass on volumetric bone mineral density (vBMD), geometry, and strength in both weight-bearing and non-weight-bearing bones of Hispanic and non-Hispanic girls...
May 22, 2018: Bone
https://www.readbyqxmd.com/read/29764734/can-the-contralateral-limb-be-used-as-a-control-during-the-growing-period-in-a-rodent-model
#3
Tanvir Mustafy, Irène Londono, Isabelle Villemure
The contralateral limb is often used as a control in various clinical, forensic and anthropological studies. However, no studies have been performed to determine if the contra-lateral limb is a suitable control during the bone development period. The aim of this study was to determine the bilateral symmetry of growing rat tibiae in terms of geometric shape, mechanical strength and bone morphological parameters with developmental stages. Left and right tibias of 18 male Sprague-Dawley rats at 4, 8 and 12 weeks of age were scanned with micro-CT for bone-morphometric evaluation and for 3D deviation analysis to quantify the geometric shape variations between left and right tibiae...
May 12, 2018: Medical Engineering & Physics
https://www.readbyqxmd.com/read/29752053/anterior-laxity-lateral-tibial-slope-and-in-situ-acl-force-differentiate-knees-exhibiting-distinct-patterns-of-motion-during-a-pivoting-event-a-human-cadaveric-study
#4
Robert N Kent, Mark J Amirtharaj, Brendan M Hardy, Andrew D Pearle, Thomas L Wickiewicz, Carl W Imhauser
Knee instability following anterior cruciate ligament (ACL) rupture compromises function and increases risk of injury to the cartilage and menisci. To understand the biomechanical function of the ACL, previous studies have primarily reported the net change in tibial position in response to multiplanar torques, which generate knee instability. In contrast, we retrospectively analyzed a cohort of 13 consecutively tested cadaveric knees and found distinct motion patterns, defined as the motion of the tibia as it translates and rotates from its unloaded, initial position to its loaded, final position...
April 11, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29737414/bone-geometry-in-young-male-and-female-football-players-a-peripheral-quantitative-computed-tomography-pqct-study
#5
Gabriel Lozano-Berges, Ángel Matute-Llorente, Alejandro Gómez-Bruton, Alex González-Agüero, Germán Vicente-Rodríguez, José A Casajús
The present study shows that football practice during growth may improve bone geometry in male and female football players. However, only females had better bone strength in comparison with controls. PURPOSE: The aim of this study was to compare bone geometry in adolescent football players and controls. METHODS: A total of 107 football players (71 males/36 females; mean age 12.7 ± 0.6/12.7 ± 0.6 years) and 42 controls (20 males/22 females; mean age 13...
May 8, 2018: Archives of Osteoporosis
https://www.readbyqxmd.com/read/29730704/normal-bone-microstructure-and-density-but-worse-physical-function-in-older-women-treated-with-selective-serotonin-reuptake-inhibitors-a-cross-sectional-population-based-study
#6
Berit Larsson, Dan Mellström, Lisa Johansson, Anna G Nilsson, Mattias Lorentzon, Daniel Sundh
Depression in the elderly is today often treated with selective serotonin reuptake inhibitors (SSRIs) because of their favorable adverse effect profile. However, treatment with SSRIs is associated with increased risk of fractures. Whether this increased risk depends on reduced bone strength or increased fall risk due to reduced physical function is not certain. The aim was therefore to investigate if treatment with SSRIs is associated with impaired bone microstructure, bone density, or physical function in older women...
May 5, 2018: Calcified Tissue International
https://www.readbyqxmd.com/read/29705683/lower-extremity-geometry-in-morbid-obesity-considerations-for-total-knee-arthroplasty
#7
Jacob M Elkins, Kevin J Simoens, John J Callaghan
BACKGROUND: Obesity has been associated with varying adverse outcomes related to total knee arthroplasty (TKA) and has long been associated with various mechanical complications. Computational modeling holds promise for investigating biomechanical aberrations related to TKA in obese patients. However, basic anthropometric information regarding the shape of the lower extremity in obese patients is lacking. We, therefore, developed a method to determine lower extremity shape both generally and subject specific as a function of body mass index (BMI) and sex...
March 30, 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29669893/-sost-deficiency-leads-to-reduced-mechanical-strains-at-the-tibia-midshaft-in-strain-matched-in-vivo-loading-experiments-in-mice
#8
Laia Albiol, Myriam Cilla, David Pflanz, Ina Kramer, Michaela Kneissel, Georg N Duda, Bettina M Willie, Sara Checa
Sclerostin, a product of the Sost gene, is a Wnt-inhibitor and thus negatively regulates bone accrual. Canonical Wnt/β-catenin signalling is also known to be activated in mechanotransduction. Sclerostin neutralizing antibodies are being tested in ongoing clinical trials to target osteoporosis and osteogenesis imperfecta but their interaction with mechanical stimuli on bone formation remains unclear. Sost knockout (KO) mice were examined to gain insight into how long-term Sost deficiency alters the local mechanical environment within the bone...
April 2018: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29659886/bone-parameters-in-anorexia-nervosa-and-athletic-amenorrhea-comparison-of-two-hypothalamic-amenorrhea-states
#9
Nurgun Kandemir, Meghan Slattery, Kathryn E Ackerman, Shreya Tulsiani, Amita Bose, Vibha Singhal, Charumathi Baskaran, Seda Ebrahimi, Mark Goldstein, Kamryn Eddy, Anne Klibanski, Madhusmita Misra
Objective: We have reported low bone mineral density (BMD), impaired bone structure, and increased fracture risk in participants with anorexia nervosa (AN) and normal-weight oligoamenorrheic athletes (OAs). However, data directly comparing compartment-specific bone parameters in participants with AN, OAs, and controls are lacking. Design: A total of 468 female participants 14 to 21.9 years old were included: 269 with AN, 104 OAs, and 95 normal-weight eumenorrheic controls...
June 1, 2018: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29619932/mortality-and-morbidity-in-patients-with-osteogenesis-imperfecta-in-denmark
#10
Lars Folkestad
Ostegenesis imperfecta (OI) is a hereditary disease of the connective tissue caused by mutations to, mainly, the genes that are involved in the biosynthesis of collagen type 1. Patients are grouped according to clinical severity and mode of inheritance according to Sillence's classification (originally 1979, updated 2014). According to our data, the population prevalence of OI in Denmark was 10.3 per 100,000, with 575 patients registered with an OI diagnosis in the National Patient Register and alive at the end of 2012 out of a total population of 5,602,628 persons...
April 2018: Danish Medical Journal
https://www.readbyqxmd.com/read/29614000/biomechanical-model-for-stress-fracture-related-factors-in-athletes-and-soldiers
#11
Amir Hadid, Yoram Epstein, Nogah Shabshin, Amit Gefen
Stress fractures (SFs) are one of the most common and potentially serious overuse injuries. PURPOSE: to develop a computational biomechanical model of strain in human tibial bone that will facilitate better understanding of the pathophysiology of SFs. METHODS: MRI of a healthy, young male, was used for full anatomical segmentation of the calf tissues, which considered hard-soft tissues biomechanical interactions. From the undeformed coronal MR images, the geometry of bones, muscles, connecting ligaments, and fat were reconstructed in three-dimensions, and meshed to a finite element model...
April 2, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29589954/validation-of-an-mri-protocol-for-routine-quantitative-assessment-of-tunnel-position-in-anterior-cruciate-ligament-reconstruction
#12
Samuel Grasso, James Linklater, Qing Li, David A Parker
BACKGROUND: No standardized methodology and objective criteria currently exist to accurately and objectively assess tunnel placement and consequent graft orientation in anterior cruciate ligament (ACL) reconstruction (ACLR) through a single imaging modality. Advances in magnetic resonance imaging (MRI) technology have enabled the use of volumetric high spatial and contrast resolution proton density-weighted sequencing, which allows precise delineation of graft orientation, tunnel position, and quantitative assessment of tunnel position relationship to adjacent reproducible anatomic landmarks...
March 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29582097/native-rotational-knee-kinematics-is-restored-after-lateral-uka-but-not-after-medial-uka
#13
Keizo Wada, Daisuke Hamada, Tomoya Takasago, Akihiro Nitta, Tomohiro Goto, Ichiro Tonogai, Yoshihiro Tsuruo, Koichi Sairyo
PURPOSE: The aim of this study was to compare the intraoperative kinematics of medial and lateral unicompartmental knee arthroplasty (UKA) with those of the native knee using a navigation system. METHODS: Six fresh-frozen cadaveric knees were included in the study. Medial UKA was performed in all right knees and lateral UKA was performed in all left knees. All UKA procedures were performed with a computerised navigation system. The tibial internal rotation angle and coronal alignment of the mechanical axis during passive knee flexion were assessed as rotational and varus/valgus kinematics before and after surgery using the navigation system...
March 26, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29579721/the-influence-of-isolated-femur-and-tibia-rotations-on-patella-cartilage-stress-a-sensitivity-analysis
#14
Tzu-Chieh Liao, Li Yin, Christopher M Powers
BACKGROUND: To determine the influence of femur and tibia rotations in the transverse and frontal planes on patella cartilage stress. METHODS: Patella cartilage stress profiles of six healthy females were obtained during a squatting task using subject-specific finite element models of the patellofemoral joint (45° of knee flexion). Input parameters for the finite element model included joint geometry, quadriceps muscle forces, and weight-bearing patellofemoral joint kinematics...
May 2018: Clinical Biomechanics
https://www.readbyqxmd.com/read/29578618/high-impact-mechanical-loading-increases-bone-material-strength-in-postmenopausal-women-a-3-month-intervention-study
#15
Daniel Sundh, Martin Nilsson, Michail Zoulakis, Courtney Pasco, Melis Yilmaz, Galateia J Kazakia, Martin Hellgren, Mattias Lorentzon
Bone adapts to loading in several ways, including redistributing bone mass and altered geometry and microarchitecture. Because of previous methodological limitations, it is not known how the bone material strength is affected by mechanical loading in humans. The aim of this study was to investigate the effect of a 3-month unilateral high-impact exercise program on bone material properties and microarchitecture in healthy postmenopausal women. A total of 20 healthy and inactive postmenopausal women (aged 55...
March 26, 2018: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/29566192/vitamin-d-status-and-functional-health-outcomes-in-children-aged-2-8-y-a-6-mo-vitamin-d-randomized-controlled-trial
#16
Neil R Brett, Colleen A Parks, Paula Lavery, Sherry Agellon, Catherine A Vanstone, Martin Kaufmann, Glenville Jones, Jonathon L Maguire, Frank Rauch, Hope A Weiler
Background: Most Canadian children do not meet the recommended dietary intake for vitamin D. Objectives: The aims were to test how much vitamin D from food is needed to maintain a healthy serum 25-hydroxyvitamin D3 [25(OH)D3] status from fall to spring in young children and to examine musculoskeletal outcomes. Design: Healthy children aged 2-8 y (n = 51) living in Montreal, Canada, were randomly assigned to 1 of 2 dietary vitamin D groups (control or intervention to reach 400 IU/d by using vitamin D-fortified foods) for 6 mo, starting October 2014...
March 1, 2018: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/29563069/biological-evaluation-and-finite-element-modeling-of-porous-poly-para-phenylene-for-orthopaedic-implants
#17
Hyunhee Ahn, Ravi R Patel, Anthony J Hoyt, Angela S P Lin, F Brennan Torstrick, Robert E Guldberg, Carl P Frick, R Dana Carpenter, Christopher M Yakacki, Nick J Willett
Poly(para-phenylene) (PPP) is a novel aromatic polymer with higher strength and stiffness than polyetheretherketone (PEEK), the gold standard material for polymeric load-bearing orthopaedic implants. The amorphous structure of PPP makes it relatively straightforward to manufacture different architectures, while maintaining mechanical properties. PPP is promising as a potential orthopaedic material; however, the biocompatibility and osseointegration have not been well investigated. The objective of this study was to evaluate biological and mechanical behavior of PPP, with or without porosity, in comparison to PEEK...
May 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29548734/the-patella-a-mechanical-determinant-of-coordination-during-vertical-jumping
#18
Daniel John Cleather
The patella is traditionally understood to be a "joint spacer" that increases the moment arm of the patellar tendon. This characterisation is unsatisfactory as it fails to explain the more interesting characteristics of the patella: 1) that the changing pivot point of the patella causes the ratio of quadriceps to patellar tendon force to almost double as the knee flexes; 2) that the patellar tendon exerts an anteriorly directed force on the tibia when the knee is extended but this switches to a posterior draw as the knee flexes; and 3) that the presence of the patella allows the quadriceps to exert different moments on the femur and tibia...
June 7, 2018: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/29529625/femoral-component-external-rotation-affects-knee-biomechanics-a-computational-model-of-posterior-stabilized-tka
#19
Mohammad Kia, Timothy M Wright, Michael B Cross, David J Mayman, Andrew D Pearle, Peter K Sculco, Geoffrey H Westrich, Carl W Imhauser
BACKGROUND: The correct amount of external rotation of the femoral component during TKA is controversial because the resulting changes in biomechanical knee function associated with varying degrees of femoral component rotation are not well understood. We addressed this question using a computational model, which allowed us to isolate the biomechanical impact of geometric factors including bony shapes, location of ligament insertions, and implant size across three different knees after posterior-stabilized (PS) TKA...
January 2018: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/29508548/effectiveness-of-various-isometric-exercises-at-improving-bone-strength-in-cortical-regions-prone-to-distal-tibial-stress-fractures
#20
C S Florio
A computational model was used to compare the local bone strengthening effectiveness of various isometric exercises that may reduce the likelihood of distal tibial stress fractures. The developed model predicts local endosteal and periosteal cortical accretion and resorption based on relative local and global measures of the tibial stress state and its surface variation. Using a multisegment 3-dimensional leg model, tibia shape adaptations due to 33 combinations of hip, knee, and ankle joint angles and the direction of a single or sequential series of generated isometric resultant forces were predicted...
March 5, 2018: International Journal for Numerical Methods in Biomedical Engineering
keyword
keyword
32792
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"