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https://www.readbyqxmd.com/read/28205407/collagen-fiber-orientation-in-primate-long-bones
#1
Johanna Warshaw, Timothy G Bromage, Carl J Terranova, Donald H Enlow
Studies of variation in orientation of collagen fibers within bone have lead to the proposition that these are preferentially aligned to accommodate different kinds of load, with tension best resisted by fibers aligned longitudinally relative to the load, and compression best resisted by transversely aligned fibers. However, previous studies have often neglected to consider the effect of developmental processes, including constraints on collagen fiber orientation (CFO), particularly in primary bone. Here we use circularly polarized light microscopy to examine patterns of CFO in cross-sections from the midshaft femur, humerus, tibia, radius and ulna in a range of living primate taxa with varied body sizes, phylogenetic relationships and positional behaviors...
February 16, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28204985/comparison-of-strain-measurement-in-the-mouse-forearm-using-subject-specific-finite-element-models-strain-gaging-and-digital-image-correlation
#2
Mark Begonia, Mark Dallas, Mark L Johnson, Ganesh Thiagarajan
Mechanical loading in bone leads to the activation of bone-forming pathways that are most likely associated with a minimum strain threshold being experienced by the osteocyte. To investigate the correlation between cellular response and mechanical stimuli, researchers must develop accurate ways to measure/compute strain both externally on the bone surface and internally at the osteocyte level. This study investigates the use of finite element (FE) models to compute bone surface strains on the mouse forearm...
February 15, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28196431/distal-radio-ulnar-implant-arthroplasty-a-systematic-review
#3
L S Moulton, G E B Giddins
: The use of implant arthroplasty in the hand and wrist is increasing, often with little evidence of outcomes in the literature. We therefore undertook a systematic review of the outcomes of distal radio-ulnar joint arthroplasties following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Papers were assessed for outcomes, implant survival and methodological quality. Fourteen papers assessed ulna head replacements. The implant survival rate was 93% at a mean follow-up of 45 months...
February 1, 2017: Journal of Hand Surgery, European Volume
https://www.readbyqxmd.com/read/28194713/use-of-compressive-osseointegration-endoprostheses-for-massive-bone-loss-from-tumor-and-failed-arthroplasty-a-viable-option-in-the-upper-extremity
#4
Krista A Goulding, Adam Schwartz, Steven J Hattrup, R Lor Randall, Donald Lee, Damian M Rispoli, Daniel M Lerman, Christopher Beauchamp
BACKGROUND: Endoprostheses using principles of compressive osseointegration have shown good survivorship in several studies involving the lower extremity; however, no series to our knowledge have documented the use of this technology in the management of massive bone loss in the upper limb. QUESTIONS/PURPOSES: (1) What proportion of upper extremity implants using compressive osseointegration fixation principles achieved durable short-term fixation, and what were the modes of failure? (2) What surgical complications resulted from reconstruction using this technique? METHODS: A multiinstitutional retrospective review identified nine patients (five women; four men) who underwent 13 endoprosthetic replacements between 2003 and 2014 using compressive osseointegration (Compliant(®) Pre-stress Device [CPS]; Biomet Inc, Warsaw, IN, USA) in the upper extremity, including two proximal humeri, two humeral diaphyses, seven distal humeri, and two proximal ulna...
February 13, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28188337/giant-cell-tumor-of-the-bone-aggressive-case-initially-treated-with-denosumab-and-intralesional-surgery
#5
Donald von Borstel, Roberto A Taguibao, Nicholas A Strle, Joseph E Burns
Giant cell tumor of the bone (GCTB) is a locally aggressive benign tumor, which has historically been treated with wide surgical excision. We report a case of a 29-year-old male with histology-proven GCTB of the distal ulna. The initial imaging study was a contrast-enhanced magnetic resonance imaging (MRI) examination of the left wrist, which was from an outside facility performed before presenting to our institution. On the initial MRI, the lesion had homogenous T2-hyperintense and T1-hypointense signal with expansive remodeling of the osseous contour...
April 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28183230/arthroscopic-assisted-tendon-reconstruction-for-triangular-fibrocartilage-complex-irreparable-tears
#6
R Luchetti, A Atzei
We report our 11-year experience of performing arthroscopically assisted triangular fibrocartilage complex reconstruction in the treatment of chronic distal radio-ulnar joint instability resulting from irreparable triangular fibrocartilage complex injuries. Eleven patients were treated. Three skin incisions were made in order to create radial and ulna tunnels for passage of the tendon graft, which is used to reconstruct the dorsal and palmar radio-ulnar ligaments, under fluoroscopic and arthroscopic guidance...
February 1, 2017: Journal of Hand Surgery, European Volume
https://www.readbyqxmd.com/read/28168319/outcomes-and-disability-after-massive-proximal-upper-extremity-reconstruction-in-a-resource-limited-setting
#7
Aviram M Giladi, R Raja Shanmugakrishnan, Hari Venkatramani, S Raja Sekaran, Kevin C Chung, S Raja Sabapathy
BACKGROUND: At Ganga Hospital in Coimbatore, India, a unique approach is applied to treat massive upper limb injuries. However, long-term outcomes of complex reconstruction performed in the resource-limited setting are not known. This hinders understanding of outcomes and disability from these injuries and prevents systematically addressing care delivery around upper extremity trauma in the developing world. This project aims to analyze the details of the unique Ganga Hospital reconstruction experience and use patient-reported outcome measures for the first time in this patient population to evaluate post-injury recovery and disability ...
February 6, 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/28166908/the-middle-stone-age-human-fossil-record-from-klasies-river-main-site
#8
Frederick E Grine, Sarah Wurz, Curtis W Marean
The paleoanthropological significance of Klasies River Main Site derives from its abundant Middle Stone Age (MSA) archaeological debris and the hominin fossils that have featured in discussions about modern human emergence. Despite their significance, the human remains have yet to be contextualized within the spatial, stratigraphic and geochronological framework of the site. We provide an updated overview of the stratigraphy and geochronology of the site, and review the human fossil record in this context. We also provide the first anatomical interpretations of many of the cranial vault fragments...
February 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/28164054/a-very-rare-presentation-of-type-1-monteggia-equivalent-fracture-with-ipsilateral-fracture-of-distal-forearm-approach-with-outcome-case-report
#9
Dhananjay Singh, Bhanu Awasthi, Vikas Padha, Sanjay Thakur
INTRODUCTION: We report a case of Type 1 Monteggia equivalent injury with intact radio-capitellar congruity, associated with epiphyseal fracture of distal radius and distal ulna shaft in an 11-year-old boy. There are only a few cases of Monteggia or Monteggia equivalent injury with ipsilateral forearm fractures in children, and injury pattern being reported by us is not only rare but also the only case reported thus far to the best of our knowledge, Sood et al. described Type 1 equivalent with epiphyseal injuries of both radius and ulna Osada et al...
September 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28164048/rare-giant-cell-tumor-of-olecranon-bone
#10
Pawan Goyal, Vishal Gautam, Narender Saini, Yogesh Sharma
INTRODUCTION: Giant cell tumor (GCT) is a bone tumor involving epiphyseal area of bone abutting the subchondral bone. Commonly found in long bones such as proximal tibia and distal femur. We report a case of GCT of olecranon bone in a 23-year-old male. CASE REPORT: A 23-year-old patient presented to our outpatient department with pain and mild swelling at the elbow from last 2 to 3 months. On examination, it was seen that there was a moderate swelling at the tip of the olecranon...
September 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28146292/use-of-locking-compression-plates-in-ulnar-fractures-of-18-horses
#11
Carrie C Jacobs, David G Levine, Dean W Richardson
OBJECTIVES: To describe the outcome, clinical findings, and complications associated with the use of the locking compression plate (LCP) for various types of ulnar fractures in horses. STUDY DESIGN: Retrospective case series. SAMPLE POPULATION: Client owned horses (n = 18). METHODS: Medical records, radiographs, and follow-up for horses having an ulnar fracture repaired using at least 1 LCP were reviewed. Fifteen of 18 horses had fractures of the ulna only, and 3 horses had fractures of the ulna and proximal radius...
February 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28145569/modified-thomas-splint-cast-combination-for-the-management-of-limb-fractures-in-small-equids
#12
Søren Ladefoged, Sigrid Grulke, Valeria Busoni, Didier Serteyn, Alexandra Salciccia, Denis Verwilghen
OBJECTIVE: To describe the management and outcome of limb fractures in small domestic equids treated with a modified Thomas splint-cast combination (MTSCC). STUDY DESIGN: Retrospective case series. ANIMALS: Client owned horses and donkeys. METHODS: Medical records, including radiographs, were reviewed for details of animals diagnosed with a limb fracture and treated by external coaptation using a MTSCC (2001-2012). Follow-up >6 months after discharge was obtained via telephone consultation with owners or veterinarians...
February 1, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28142350/giant-cell-tumor-of-distal-radius-treated-with-ulnar-translocation-and-wrist-arthrodesis
#13
Abhijeet Ashok Salunke, Jaymin Shah, Vikas Warikoo, Amit Chakraborty, Harshwardhan Pokharkar, Yongsheng Chen, Manish Pruthi, Jyotindra Pandit
INTRODUCTION: The aim is to analyze the functional outcomes of patients of giant cell tumor (GCT) of distal radius treated with ulnar translocation and wrist arthrodesis. METHODS: Study included 25 patients of aggressive GCT of distal radius, resected and reconstructed using ulnar translocation and wrist arthrodesis. The ulna-carpal radius fixation was performed with plate and screws. The patients were followed to bony union and minimum follow-up was 1 year. RESULT: Twenty-two patients were of Campanacci grade 3 and three patients were of Campanacci grade2...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28137437/pronation-and-supination-of-the-hand-anatomy-and-biomechanics
#14
M Soubeyrand, B Assabah, M Bégin, E Laemmel, A Dos Santos, M Crézé
Proper functioning of the hand relies on its capacity to rotate and point the palm upward (i.e. supination) or downward (i.e. pronation) when standing up with the elbow in 90° flexion. Hand rotation is possible because of forearm rotation and also rotation of the whole upper limb at the shoulder. Two distinct mechanisms contribute to hand rotation: one in which the ulna is immobile and another in which the ulna is mobile. In this review, we first summarize how evolution of the human species has led to the progressive development of specific forearm anatomy that allows for pronation and supination...
February 2017: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/28127616/erratum-to-augmentation-of-diaphyseal-fractures-of-the-radius-and-ulna-in-toy-breed-dogs-using-a-free-autogenous-omental-graft-and-bone-plating-by-w-i-baltzer-et-al-vet-comp-orthop-traumatol-2015-28-131-139
#15
(no author information available yet)
No abstract text is available yet for this article.
January 27, 2017: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/28119800/ulna-rotation-osteotomy-in-complete-dislocation-of-the-distal-radioulnar-joint
#16
Markus Gabl, Rohit Arora, Eva Maria Gassner, Gernot Schmidle
Background Complete dislocation of the distal radioulnar joint (DRUJ) is a rare injury. Dislocation can present as uni- or multidirectional, acute or chronic, reducible or irreducible. It can occur due to isolated loss of ligamentous restraints or more frequent in Galeazzi - or Essex-Lopresti-type fractures. Case Description A 28-year-old man sustained a distal radius fracture and presented after conservative treatment with blocked supination. Examination revealed a malunion of the distal radius in combination with an irreducible dorsal dislocation of the DRUJ...
February 2017: Journal of Wrist Surgery
https://www.readbyqxmd.com/read/28119794/the-oblique-metaphyseal-shortening-osteotomy-of-the-distal-ulna-surgical-technique-and-results-of-ten-patients
#17
Szabolcs Benis, Jean F Goubau, Koen Mermuys, Petrus Van Hoonacker, Bart Berghs, Diederick Kerckhove, Bert Vanmierlo
Background Ulnocarpal abutment is a common condition following distal radius fractures. There are different surgical methods of treatment for this pathology: open and arthroscopic wafer procedure or an ulnar shortening osteotomy. We describe an oblique metaphyseal shortening osteotomy of the distal ulna using two cannulated headless compression screws. We report the results of 10 patients treated with this method. Materials and Methods Out of 17 patients, 10 could be reviewed retrospectively for this study...
February 2017: Journal of Wrist Surgery
https://www.readbyqxmd.com/read/28117081/post-traumatic-forearm-nonunion-in-healthy-skeletally-immature-children-a-report-on-15-cases
#18
Giovanni Luigi Di Gennaro, Stefano Stilli, Giovanni Trisolino
BACKGROUND: Nonunion is a rare but severe complication following forearm fracture in skeletally immature patients. The purpose of this study is to describe a case series of pediatric forearm nonunions treated at our Institute. MATERIALS AND METHOD: We retrospectively reviewed medical charts and radiographs of healthy children affected by post-traumatic nonunion of the forearm, from April 1992 to July 2015. An overall series of 15 cases was included in the study...
January 9, 2017: Injury
https://www.readbyqxmd.com/read/28110067/poly-glycerol-sebacate-elastomer-supports-bone-regeneration-by-its-mechanical-properties-being-closer-to-osteoid-tissue-rather-than-to-mature-bone
#19
S H Zaky, K W Lee, J Gao, A Jensen, K Verdelis, Y Wang, A J Almarza, C Sfeir
: Mechanical load influences bone structure and mass. Arguing the importance of load-transduction, we investigated the mechanisms inducing bone formation using an elastomeric substrate. We characterized Poly (glycerol sebacate) (PGS) in-vitro for its mechanical properties, compatibility with osteoprogenitor cells regarding adhesion, proliferation, differentiation under compression versus static cultures and in-vivo for the regeneration of a rabbit ulna critical size defect. The load-transducing properties of PGS were compared in-vitro to a stiffer poly lactic-co- glycolic-acid (PLA/PGA) scaffold of similar porosity and interconnectivity...
January 18, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28100234/arthroscopic-reduction-and-fixation-of-coronoid-fractures-with-an-exchange-rod-a-new-technique
#20
Kan Ouyang, Daping Wang, Wei Lu, Jianyi Xiong, Jian Xu, Liangquan Peng, Haifeng Liu, Hao Li, Wenzhe Feng
BACKGROUND: The ulnar coronoid process plays a central role in maintaining elbow stability. Some of its fractures were often combined with injury of bone and ligament. Arthroscopy enables perfect visualization to allow anatomical repair. METHODS: From January 2012 to December 2013, six patients (four males, two females) with a mean age of 26.6 years were treated. The left and right ulnas were involved in two and four patients, respectively. All patients suffered from ipsilateral subluxation of the elbow without associated radial fracture...
January 18, 2017: Journal of Orthopaedic Surgery and Research
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