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https://www.readbyqxmd.com/read/28337656/what-factors-are-associated-with-femoral-component-internal-rotation-in-tka-using-the-gap-balancing-technique
#1
Seung-Yup Lee, Hong-Chul Lim, Ki-Mo Jang, Ji-Hoon Bae
BACKGROUND: When using the gap-balancing technique for TKA, excessive medial release and varus proximal tibial resection can be associated with internal rotation of the femoral component. Previous studies have evaluated the causes of femoral component rotational alignment with a separate factor analysis using unadjusted statistical methods, which might result in treatment effects being attributed to confounding variables. QUESTIONS/PURPOSES: (1) What pre- and intraoperative factors are associated with internal rotation of the femoral component in TKA using the gap balancing technique? (2) To what degree does femoral component rotation as defined by the navigation system differ from rotation as measured by postoperative CT? METHODS: Three hundred seventy-seven knees that underwent computer-assisted primary TKA attributable to degenerative osteoarthritis with varus or mild valgus alignment in which medial soft tissue release was performed, and those with preoperative radiographs including preoperative CT between October 2007 and June 2014 were included in the study...
March 23, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28336452/the-relationship-of-bone-properties-using-high-resolution-peripheral-quantitative-computed-tomography-to-radiographic-components-of-hip-osteoarthritis
#2
Mark H Edwards, Julien Paccou, Kate A Ward, Karen A Jameson, Charlotte Moss, Jennifer Woolston, M Kassim Javaid, Cyrus Cooper, Elaine M Dennison
OBJECTIVE: Positive associations between radiographic osteoarthritis (OA) and areal BMD have been demonstrated and appear strongest when bony features of OA are considered. To date, these associations have not been assessed using HRpQCT. DESIGN: A total of 318 participants (170 men and 148 women), aged 72.1-81.4 years from a non-selected cohort, underwent HRpQCT of the distal radius and tibia along with hip radiography. Differences in bone microarchitecture were assessed between those with and without osteophytes, sclerosis or joint space narrowing (JSN) in either hip...
March 20, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/28328865/novel-management-of-distal-tibial-and-fibular-fractures-with-acumed-fibular-nail-and-minimally-invasive-plating-osteosynthesis-technique-a-case-report
#3
Tie-Jun Wang, Wei-Na Ju, Bao-Chang Qi
RATIONALE: Anatomical characteristics, such as subcutaneous position and minimal muscle cover, contribute to the complexity of fractures of the distal third of the tibia and fibula. Severe damage to soft tissue and instability ensure high risk of delayed bone union and wound complications such as nonunion, infection, and necrosis. PATIENT CONCERNS: This case report discusses management in a 54-year-old woman who sustained fractures of the distal third of the left tibia and fibula, with damage to overlying soft tissue (swelling and blisters)...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28326606/physical-activity-sedentary-time-and-bone-strength-from-childhood-to-early-adulthood-a-mixed-longitudinal-hr-pqct-study
#4
Leigh Gabel, Heather M Macdonald, Lindsay Nettlefold, Heather A McKay
Bone strength is influenced by bone geometry, density, and bone microarchitecture, which adapt to increased mechanical loads during growth. Physical activity (PA) is essential for optimal bone strength accrual; however, less is known about how sedentary time influences bone strength and its determinants. Thus, our aim was to investigate the prospective associations between PA, sedentary time, and bone strength and its determinants during adolescence. We used HR-pQCT at distal tibia (8% site) and radius (7% site) in 173 girls and 136 boys (aged 9 to 20 years at baseline)...
March 22, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28323803/patient-response-to-an-integrated-orthotic-and-rehabilitation-initiative-for-traumatic-injuries-the-prioriti-mtf-study
#5
Joseph R Hsu, Johnny G Owens, Jennifer DeSanto, John R Fergason, Kevin M Kuhn, Benjamin K Potter, Daniel J Stinner, Robert G Sheu, Sandra L Waggoner, Jason M Wilken, Yanjie Huang, Daniel O Scharfstein, Ellen J MacKenzie
Although limb salvage is now possible for many high-energy open fractures and crush injuries to the distal tibia, ankle, hindfoot, and midfoot, orthotic options are limited. The Intrepid Dynamic Exoskeletal Orthosis (IDEO) is a custom, energy-storing carbon fiber orthosis developed for trauma patients undergoing limb salvage. The IDEO differs from other orthoses in that it allows patients with ankle weakness to have more normal ankle biomechanics and increased ankle power. This article describes the design of a study to evaluate the effectiveness of the IDEO when delivered together with a high-intensity, sports medicine-based approach to rehabilitation...
April 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28323802/outcomes-after-severe-distal-tibia-ankle-and-or-foot-trauma-comparison-of-limb-salvage-versus-transtibial-amputation-outlet
#6
Michael J Bosse, David Teague, Lisa Reider, Joshua L Gary, Saam Morshed, Rachel B Seymour, James Toledano, Lisa K Cannada, Barbara Steverson, Daniel O Scharfstein, Jason Luly, Ellen J MacKenzie
Severe foot and ankle injuries are complex and challenging to treat, often requiring multiple operations to salvage the limb contributing to a prolonged healing period. There is some evidence to suggest that early amputation for some patients may result in better long-term outcomes than limb salvage. The challenge is to identify the regional injury burden for an individual that would suggest a better outcome with an amputation. The OUTLET study is a prospective, multicenter observational study comparing 18-month outcomes after limb salvage versus early amputation among patients aged 18-60 years with severe distal tibia, ankle, and foot injuries...
April 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28323143/effect-of-age-and-gender-on-serum-periostin-relationship-to-cortical-measures-bone-turnover-and-hormones
#7
Jennifer S Walsh, Fatma Gossiel, Jessica R Scott, Margaret A Paggiosi, Richard Eastell
Periostin is an extracellular matrix protein, and in bone is expressed most highly in the periosteum. It increases bone formation through osteoblast differentiation, cell adhesion, Wnt signalling and collagen cross-linking. We hypothesised that serum periostin would be high at times of life when cortical modeling is active, in early adulthood and in older age, and that it would correlate with cortical bone measures, bone turnover and hormones that regulate cortical modeling. We conducted a cross-sectional observational study of 166 healthy men and women at three skeletal stages; the end of longitudinal growth (16-18years), peak bone mass (30-32years) and older age (over 70years)...
March 16, 2017: Bone
https://www.readbyqxmd.com/read/28322717/lengthening-and-deformity-correction-about-the-knee-using-a-magnetic-internal-lengthening-nail
#8
Austin T Fragomen, S Robert Rozbruch
INTRODUCTION: The introduction of the internal lengthening nail (ILN) has changed the treatment of complex malalignment and shortening about the knee. Acute correction of the deformity and gradual lengthening through this osteotomy site has greatly simplified postoperative recovery. This manuscript is a review of the techniques that are currently being used in surgery. METHODS: The article is broken into two sections: distal femur osteotomy and tibia osteotomy. Each is addressed separately since they have different personalities...
2017: SICOT-J
https://www.readbyqxmd.com/read/28321479/novel-anatomical-reconstruction-of-distal-tibiofibular-ligaments-restores-syndesmotic-biomechanics
#9
Jian Che, Chunbao Li, Zhipeng Gao, Wei Qi, Binping Ji, Yujie Liu, Ming Han Lincoln Liow
PURPOSE: To date, there is a paucity of literature on syndesmotic reconstruction techniques that restore both anatomic stability and physiologic syndesmotic biomechanics. In this cadaveric study, (1) a novel syndesmotic reconstruction surgical technique using autogenous peroneus brevis tendon was described and (2) the biomechanical properties of the reconstruction was investigated. METHODS: Ten fresh-frozen lower extremities were used in this study. Reconstruction of the anterior and posterior, as well as the interosseous tibiofibular ligaments was performed with a halved peroneus brevis tendon...
March 20, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28320209/anterolateral-ligament-of-the-knee-anatomy-function-imaging-and-treatment
#10
Ronak M Patel, Robert H Brophy
The anterolateral ligament (ALL) of the knee has gained attention recently for its potential role in rotational stability of the knee, especially in association with anterior cruciate ligament (ACL) injuries. Anatomic studies have characterized the ALL as it runs in an anteroinferior and oblique direction from the lateral distal femur to the anterolateral proximal tibia, although the prevalence and variance of this ligament are not well understood. Magnetic resonance imaging and ultrasound have identified the ligament and linked it with the classically described Segond fracture...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28318074/perforating-and-deep-lymphatic-vessels-in-the-knee-region-an-anatomical-study-and-clinical-implications
#11
Wei-Ren Pan, Fan-Qiang Zeng, De-Guang Wang, Zhi-Qiang Qiu
BACKGROUND: To determine the relationship between the perforating and deep lymphatic vessels in the knee region for clinical implications. METHODS: Four lower limbs from two unembalmed human cadavers were used. Under a surgical microscope, 6% hydrogen peroxide was employed to detect lymph vessels accompanying the small saphenous vein, anterior tibial, posterior tibial and fibular blood vessels all commencing from distal ends of specimens. Each lymphatic vessel was inserted by a 30-gauge needle and injected with a barium sulphate mixture...
March 20, 2017: ANZ Journal of Surgery
https://www.readbyqxmd.com/read/28317346/-efficacy-of-systemic-administration-of-oxytocin-on-implant-osseointegration-in-osteoporotic-rats
#12
Wang Maiquan, Peng Liwei, Li Yunfeng
OBJECTIVE: This study investigated the effects of systemic administration of oxytocin (OT) in osteoporotic rats on implant osseointegration. METHODS: Twenty rats were randomly assigned to the control and experimental groups. Initially, the rats underwent bilateral ovariectomy. After 12 weeks, an osteoporosis model was established. Each rat received an implant at the distal and middle femoral metaphysis. Simultaneously, systemic administration was conducted with one group receiving subcutaneous injection of OT (1 mg·kg⁻¹ per day), whereas the other group received placebo injection...
August 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28302305/absolute-or-relative-stability-in-minimal-invasive-plate-osteosynthesis-of-simple-distal-meta-or-diaphyseal-tibia-fractures
#13
R Wenger, F Oehme, J Winkler, S M Perren, R Babst, F J P Beeres
INTRODUCTION: Minimal invasive plate osteosynthesis in simple distal meta or diaphyseal tibia fractures can be applied using absolute (lag screw and neutralisation plate; LSN) or relative stability (bridge plate; BP). The primary aim of the study was to compare time to radiological union and time to full weight bearing in the two groups (LSN vs. BP). Reduction was performed either percutaneously or by a minimally open approach (mini open). Secondary aim was to analyse the number of complications between both groups...
March 6, 2017: Injury
https://www.readbyqxmd.com/read/28289103/bone-structural-changes-after-gastric-bypass-surgery-evaluated-by-hr-pqct-a-two-year-longitudinal-study
#14
Vikram Vinod Shanbhogue, René Klinkby Støving, Katrine Diemer Frederiksen, Stine Hanson, Kim Brixen, Jeppe Gram, Niklas Rye Jorgensen, Stinus Hansen
Objective, design and methods: Roux-en-Y gastric bypass (RYGB) has proved successful in attaining sustained weight loss but may lead to metabolic bone disease. To assess impact on bone mass and structure, we measured areal bone mineral density at the hip and spine by dual-energy x-ray absorptiometry, and volumetric BMD (vBMD) and bone microarchitecture at the distal radius and tibia by high-resolution peripheral quantitative CT in 25 morbidly obese subjects (15 females, 10 males) at 0, 12 and 24 months after RYGB...
March 13, 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/28285038/peri-implant-distribution-of-polyethylene-debris-in-postmortem-retrieved-knee-arthroplasties-can-polyethylene-debris-explain-loss-of-cement-bone-interlock-in-successful-total-knee-arthroplasties
#15
Karen I Cyndari, Jacklyn R Goodheart, Mark A Miller, Megan E Oest, Timothy A Damron, Kenneth A Mann
BACKGROUND: Loss of mechanical interlock between cement and bone with in vivo service has been recently quantified for functioning, nonrevised, cemented total knee arthroplasties (TKAs). The cause of interlocking trabecular resorption is not known. The goal of this study is to quantify the distribution of PE debris at the cement-bone interface and determine if polyethylene (PE) debris is locally associated with loss of interlock. METHODS: Fresh, nonrevised, postmortem-retrieved TKAs (n = 8) were obtained en bloc...
February 3, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28282213/anatomic-and-histological-investigation-of-the-anterolateral-capsular-complex-in-the-fetal-knee
#16
Soheil Sabzevari, Amir Ata Rahnemai-Azar, Marcio Albers, Monica Linde, Patrick Smolinski, Freddie H Fu
BACKGROUND: There is currently disagreement with regard to the presence of a distinct ligament in the anterolateral capsular complex of the knee and its role in the pivot-shift mechanism and rotatory laxity of the knee. PURPOSE: To investigate the anatomic and histological properties of the anterolateral capsular complex of the fetal knee to determine whether there exists a distinct ligamentous structure running from the lateral femoral epicondyle inserting into the anterolateral tibia...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28279427/finite-element-analysis-of-the-three-different-posterior-malleolus-fixation-strategies-in-relation-to-different-fracture-sizes
#17
Adeel Anwar, Decheng Lv, Zhi Zhao, Zhen Zhang, Ming Lu, Muhammad Umar Nazir, Wasim Qasim
PURPOSE: Appropriate fixation method for the posterior malleolar fractures (PMF) according to the fracture size is still not clear. Aim of this study was to evaluate the outcomes of the different fixation methods used for fixation of PMF by finite element analysis (FEA) and to compare the effect of fixation constructs on the size of the fracture computationally. MATERIALS AND METHODS: Three dimensional model of the tibia was reconstructed from computed tomography (CT) images...
February 20, 2017: Injury
https://www.readbyqxmd.com/read/28276092/bone-microarchitecture-assessed-by-hr-pqct-as-predictor-of-fracture-risk-in-postmenopausal-women-the-ofely-study
#18
Elisabeth Sornay-Rendu, Stephanie Boutroy, François Duboeuf, Roland D Chapurlat
Several cross-sectional studies have shown that impairment of bone microarchitecture contributes to skeletal fragility. The aim of this study was to prospectively investigate the prediction of fracture (Fx) by bone microarchitecture assessed by high-resolution peripheral computed tomography (HR- pQCT) in postmenopausal women. We measured microarchitecture at the distal radius and tibia with HR-pQCT in the OFELY study, in addition to areal BMD with dual-energy X-ray absorptiometry (DXA) in 589 women, mean ± SD age 68 ± 9 years...
March 9, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28273496/ertl-and-non-ertl-amputees-exhibit-functional-biomechanical-differences-during-the-sit-to-stand-task
#19
Abbie E Ferris, Cory L Christiansen, Gary D Heise, David Hahn, Jeremy D Smith
BACKGROUND: People with transtibial amputation stand ~50times/day. There are two general approaches to transtibial amputation: 1) distal tibia and fibula union using a "bone-bridge" (Ertl), 2) non-union of the tibia and fibula (Non-Ertl). The Ertl technique may improve functional outcomes by increasing the end-bearing ability of the residual limb. We hypothesized individuals with an Ertl would perform a five-time sit-to-stand task faster through greater involvement/end-bearing of the affected limb...
February 22, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28272066/unusual-presentation-of-chondroblastoma-mimicking-trevor-s-disease
#20
Y Karkhur, A Tiwari, T Verma, L Maini
Chondroblastoma is a benign bone tumor, represents 1%-2% of all primary bone tumors, typically seen in patients 10-25-year-old and more common in males. It occurs most frequently in the distal femur, proximal tibia, and proximal humerus. Soft tissue extension is extremely rare. Adjacent joints may develop effusions, but the tumor mass protruding into the joint has never been seen in case of chondroblastoma. We report a rare case of intra-articular chondroblastoma arising from proximal tibia in a 16-year-old boy and growing into the knee joint mimicking an intra-articular osteochondroma...
March 3, 2017: Journal of Postgraduate Medicine
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