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https://www.readbyqxmd.com/read/28636055/effect-of-headless-compression-screw-on-construct-stability-for-centre-of-rotation-and-angulation-based-levelling-osteotomy-biomechanical-testing-in-flexion-and-torsion
#1
Michelle R Meyer, Mireya A Perez, Mohammad S Hossain, Edward B Silverman, Randall B Fitch, Ryan B Wicker
OBJECTIVE: To compare the biomechanical properties of bone and implant constructs when used for the centre of rotation and angulation (CORA) based levelling osteotomy, with and without implantation of a trans-osteotomy headless compression screw tested under three-point flexural and torsional forces; thereby determining the contribution of a trans-osteotomy headless compression screw with regards to stability of the construct. METHODS: Experimental biomechanical study utilizing 12 pairs of cadaveric canine tibias...
June 21, 2017: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/28636054/guidelines-for-surgical-approaches-for-minimally-invasive-plate-osteosynthesis-in-cats
#2
Philipp A Schmierer, Antonio Pozzi
OBJECTIVES: Minimally invasive plate osteosynthesis (MIPO) is one of the most recent fixation techniques that embody the concept of biological osteosynthesis. Several studies evaluating MIPO in dogs have been published in the recent years. However, there are few clinical reports of MIPO in cats and no description of the surgical approaches. The purpose of our study was to describe the safe corridors for plate insertion in cats using the MIPO technique. METHODS: The surgical approaches for the humerus, radius-ulna, femur and tibia were developed after reviewing the described techniques and surgical approaches for MIPO in dogs, while considering any relevant anatomical difference between dogs and cats...
June 21, 2017: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/28634743/comminuted-olecranon-fractures-biomechanical-testing-of-locked-versus-minifragment-non-locked-plate-fixation
#3
David S Wellman, Scott M Tucker, Josh R Baxter, Nadine C Pardee, Lionel E Lazaro, Christopher S Smith, Dean G Lorich, David L Helfet
INTRODUCTION: Open reduction and internal fixation has long been accepted as optimal treatment for displaced olecranon fractures based on poor results seen with conservative management. With the presence of comminution, tension-band wiring constructs are contraindicated due to tendency to compress through fragments, thereby shortening the articular segment. Therefore, plate fixation is typically employed. Our hypothesis was that in a comminuted fracture model, 2.7 mm reconstruction plating without locking screws will perform equally to 3...
June 20, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28633783/a-biomechanical-analysis-of-interference-screw-versus-bone-tunnel-fixation-of-flexor-hallucis-longus-tendon-transfers-to-the-calcaneus
#4
George T Liu, B Christian Balldin, Jacob R Zide, Christopher T Chen
The flexor hallucis longus tendon transfer is commonly used to restore function in chronic Achilles tendon ruptures and chronic Achilles tendinopathy. The tendon is often secured to the calcaneus either through a bone tunnel or by an interference screw. We hypothesized that tenodesis using the bone tunnel method would be mechanically superior to interference screw fixation for flexor hallucis longus transfers. Eight matched pairs of cadaveric specimens were assigned randomly to the bone tunnel or interference screw technique and were loaded to failure...
July 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28633781/beaming-in-charcot-arthropathy-intramedullary-fixation-for%C3%A2-complicated-reconstructions-a-cadaveric-study
#5
Corey M Fidler, Benjamin C Watson, Christopher W Reb, Christopher F Hyer
In the modern treatment of Charcot neuroarthropathy, beam screw fixation is an alternative to plate and screw fixation. Exposure is minimized for implantation, and this technique supports the longitudinal columns of the foot as a rigid load-sharing construct. A published data review identified a paucity of data regarding metatarsal intramedullary canal morphology relevant to beam screw fixation. The purpose of the present study was to describe metatarsal diaphyseal morphology qualitatively and quantitatively in an effort to provide data that can be used by surgeons when selecting axially based intramedullary fixation...
July 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28632586/interrater-and-intrarater-reliability-of-arthroscopic-measurements-of-articular-cartilage-defects-in-the-knee
#6
David C Flanigan, James L Carey, Robert H Brophy, William C Graham, Alex C DiBartola, David Hamilton, Haikady N Nagaraja, Christian Lattermann
BACKGROUND: Cartilage lesions of the knee are difficult to treat. Lesion size is a critical factor in treatment algorithms, and the accurate, reproducible sizing of lesions is important. In this study, we evaluated the interrater and intrarater reliability of, and correlations in relation to, various arthroscopic sizing techniques. METHODS: Five lesions were created in each of 10 cadaveric knees (International Cartilage Repair Society grade 3C). Three orthopaedic surgeons used 4 techniques (visualization and use of a 3-mm probe, a simple metal ruler, and a sliding metallic ruler tool) to estimate lesion size...
June 21, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28632564/accuracy-of-percutaneous-pedicle-screw-placement-does-training-level-matter
#7
Evan O Baird, Steven J McAnany, Samuel Overley, Branko Skovrlj, Javier Z Guzman, Sheeraz A Qureshi
STUDY DESIGN: In vitro human cadaveric surgical technique study. OBJECTIVE: To assess the accuracy of percutaneous pedicle screw placement in a human cadaveric model using standard fluoroscopic guidance technique, compared across varying levels of experience. SUMMARY OF BACKGROUND DATA: The current literature varies widely in the reported frequency of facet violation during placement of percutaneous pedicle screws. However, as of yet there are no studies examining the effect that training level has on accuracy of placement...
July 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28632549/biomechanical-investigation-of-a-novel-revision-device-in-an-osteoporotic-model-pullout-strength-of-pedicle-screw-anchor-versus-larger-screw-diameter
#8
Jacinto Manon, Mir M Hussain, Jonathan Harris, Mark Moldavsky, Frank La Marca, Brandon S Bucklen
STUDY DESIGN: In vitro cadaveric biomechanical study. OBJECTIVE: To assess revision pullout strength of novel anchored screws (AS) versus conventional larger diameter traditional pedicle screws (TPS) in an osteoporotic model. SUMMARY OF BACKGROUND DATA: Pedicle screws are the most ubiquitous method of treating spinal pathologies requiring lumbar fusion. Although these screws are effective in providing 3-column stabilization of the spine, revision surgeries are occasionally necessary, particularly for geriatric and osteoporotic populations...
July 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28631670/-topographic-anatomy-of-the-hook-region-and-its-significance-for-the-choice-of-the-surgical-technique-for-the-cochlear-implantation
#9
Yu K Yanov, V E Kuzovkov, A S Lilenko, I V Kostevich, S B Sugarova, A Sh Amonov
The mode of the introduction of the active electrode of a cochlear implant into the cochlea remains a key issue as far as cochlear implantation is concerned. Especially much attention has recently been given to the relationship between the anatomical features of the basal region of the cochlea (the so-called 'fish hook') and the possibility to approach it. We have undertaken the attempt to optimize the approach to the tympanic canal (scala tympanica) of the cochlea with a view to reducing to a minimum the risk of an injury to the cochlear structures in the course of cochlear implantation...
2017: Vestnik Otorinolaringologii
https://www.readbyqxmd.com/read/28631411/function-of-bacterial-community-dynamics-in-the-formation-of-cadaveric-semiochemicals-during-in-situ-carcass-decomposition
#10
Javier Pascual, Christian von Hoermann, Ann-Marie Rottler-Hoermann, Omer Nevo, Alicia Geppert, Johannes Sikorski, Katharina J Huber, Sandra Steiger, Manfred Ayasse, Jörg Overmann
The decomposition of dead mammalian tissue involves a complex temporal succession of epinecrotic bacteria. Microbial activity may release different cadaveric volatile organic compounds which in turn attract other key players of carcass decomposition such as scavenger insects. To elucidate the dynamics and potential functions of epinecrotic bacteria on carcasses, we monitored bacterial communities developing on still-born piglets incubated in different forest ecosystems by combining high-throughput Illumina 16S rRNA sequencing with gas chromatography-mass spectrometry of volatiles...
June 19, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28631333/a-novel-treatment-for-keratitis-sicca-dry-eye-anatomical-feasibility-study
#11
Joe Iwanaga, Koichi Watanabe, Jingo Kusukawa, Christian Fisahn, Fernando Alonso, Rod J Oskouian, R Shane Tubbs
INTRODUCTION Chronic dry eye (keratitis sicca) is a significant problem that in certain populations can result in corneal desiccation and the potential for blindness. Therefore, novel treatments for such disorders might decrease patient morbidity. The present study aimed to investigate a potential treatment for chronic dry eye via a cadaveric feasibility study. MATERIALS AND METHODS On 10 cadaveric sides, the parotid gland branch of the auriculotemporal nerve was identified and anastomosed to an anterior superficial temporal branch of this same nerve...
June 20, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28630729/acetabular-rim-length-an-anatomical-study-to-determine-reasonable-graft-sizes-for-labral-reconstruction
#12
Michael R Karns, Sunny H Patel, Jensen Kolaczko, Raymond W Liu, Richard C Mather, Brian J White, Shane J Nho, Michael J Salata
The purpose of this article is to determine normative values for the length of the acetabular rim and detect differences between gender, age, ethnicity, height and leg length. Six measurements were taken on the acetabular rim of 143 cadaveric skeleton specimens (286 acetabula) using a coordinate-measuring device: circumferential (excluding acetabular notch), anterior inferior iliac spine (AIIS)-anterior, AIIS-posterior, 12-3 o'clock, 12-9 o'clock and 11-5 o'clock. Museum specimen height data and leg length data from a previous study were recorded for 109 of 143 specimens...
January 2017: Journal of Hip Preservation Surgery
https://www.readbyqxmd.com/read/28628532/evaluation-of-the-effectiveness-and-safety-of-ultrasound-guided-percutaneous-carpal-tunnel-release-a-cadaveric-study
#13
Robert Burnham, Larry Playfair, Eldon Loh, Shannon Roberts, Anne Agur
OBJECTIVE: The looped thread carpal tunnel release (TCTR) procedure is a minimally invasive percutaneous technique performed under ultrasound (US) to transect the transverse carpal ligament in patients with carpal tunnel syndrome. Study objectives were to evaluate the accuracy of identifying key US landmarks, safety, effectiveness, and technical difficulty of TCTR. DESIGN: Fourteen lightly embalmed cadaveric distal forearm-hand specimens were subject to US identification of key landmarks, TCTR procedure, and post-TCTR dissection...
July 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28624856/the-glenocapsular-ligament-and-the-posterosuperior-part-of-the-joint-capsule-of-the-shoulder-are-well-vascularized
#14
Elle Põldoja, Madis Rahu, Kristo Kask, Jüri-Toomas Kartus, Imke Weyers, Ivo Kolts
PURPOSE: A detailed structural anatomy of the posterosuperior shoulder capsule and "glenocapsular ligament" is still rather unknown. The purpose of this study was meticulously to investigate and describe the structure and blood supply of the glenocapsular ligament on the posterosuperior shoulder joint capsule. METHOD: Sixteen fixed and twelve fresh cadaveric shoulder specimens with a mean age of 73.4 (±6.4) years were analysed. Dissection without arterial injection was performed on the 16 fixed specimens-using an alcohol-formalin-glycerol solution...
June 17, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28623517/nerve-root-anomalies-making-sense-of-a-complicated-literature
#15
REVIEW
Cameron K Schmidt, Tarush Rustagi, Fernando Alonso, Marios Loukas, Jens R Chapman, Rod J Oskouian, R Shane Tubbs
INTRODUCTION: Nerve root anomalies (NRAs) are a set of well-described congenital irregularities for which several classification systems have been devised over the years. CONCLUSION: This comprehensive review examines the anatomy and characteristics of NRAs; their surgical, radiographic, and cadaveric prevalence rates; clinical and radiographic presentations; and surgical management. In addition, the top 5 NRA classification systems are presented and related.
June 16, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28623079/restoration-of-articular-geometry-using-current-graft-options-for-large-glenoid-bone-defects-in-anterior-shoulder-instability
#16
Laurent B Willemot, Mohsen Akbari-Shandiz, Joaquin Sanchez-Sotelo, Kristin Zhao, Olivier Verborgt
PURPOSE: The purpose of this cadaveric study was to compare standard and modified coracoid transfer procedures, bicortical and tricortical iliac crest autografts, and tibial plafond and glenoid allografts with respect to glenoid surface curvature restoration. METHODS: Computed tomography scans of 8 cadaveric shoulders were acquired in 9 conditions: (1) intact, (2) 25% width defect, (3) classic Latarjet, (4) modified congruent-arc Latarjet, (5) tricortical iliac crest inner table, (6) outer table, (7) bicortical iliac crest, (8) distal tibia, and (9) glenoid allograft...
June 13, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28622833/biomechanical-evaluation-of-the-tension-band-wiring-principle-a-comparison-between-two-different-techniques-for-transverse-patella-fracture-fixation
#17
Ivan Zderic, Karl Stoffel, Christoph Sommer, Dankward Höntzsch, Boyko Gueorguiev
PURPOSE: The aim of this study was to investigate the validity of the dynamic compression principle of tension band wiring in two techniques for patella fracture treatment. METHODS: Twelve human cadaveric knees with simulated transverse patella fractures were assigned to two groups for treatment with tension band wiring using either Kirschner (K-) wires or cannulated screws. Biomechanical testing was performed over three knee movement cycles between 90° flexion and 0° full extension...
May 29, 2017: Injury
https://www.readbyqxmd.com/read/28622409/ultrasound-guided-hydrodissection-decreases-gliding-resistance-of-the-median-nerve-within-the-carpal-tunnel
#18
Stefanie Evers, Andrew R Thoreson, Jay Smith, Chunfeng Zhao, Jennifer R Geske, Peter C Amadio
INTRODUCTION: The aim of this study was to assess alterations in median nerve biomechanics within the carpal tunnel resulting from ultrasound-guided hydrodissection in a cadaveric model. METHODS: Twelve fresh frozen human cadaver hands were used. Median nerve gliding resistance was measured at baseline and post-hydrodissection, by pulling the nerve proximally and then returning it to the origin. Six specimens were treated with hydrodissection, and 6 were used as controls...
June 16, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28621684/expression-of-hypothalamic-neurohormones-and-their-receptors-in-the-human-eye
#19
Sander R Dubovy, Maria P Fernandez, Jose J Echegaray, Norman L Block, Noriyuki Unoki, Roberto Perez, Irving Vidaurre, Richard K Lee, Mehrdad Nadji, Andrew V Schally
Extrapituitary roles for hypothalamic neurohormones have recently become apparent and clinically relevant, based on the use of synthetic peptide analogs for the treatment of multiple conditions including cancers, pulmonary edema and myocardial infarction. In the eye, it has been suggested that some of these hormones and their receptors may be present in the ciliary body, iris, trabecular meshwork and retina, but their physiological role has yet to be elucidated. Our study intends to comprehensively demonstrate the expression of some hypothalamic neuroendocrine hormones and their receptors within different retinal and extraretinal structures of the human eye...
June 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/28620932/fiber-type-composition-of-the-palmaris-brevis-muscle-implications-for-palmar-function
#20
Colin W Moore, Tyler S Beveridge, Charles L Rice
The palmaris brevis (PB) is a small muscle of variant morphology located on the ulnar aspect of the palm, superficial to the hypothenar eminence. Functionally, the PB has been proposed to protect the neurovasculature of the ulnar canal from compressive forces during repetitive or intermittent trauma associated with grasping. Although PB function has been inferred from cadaveric observations, it is unknown whether it has the contractile capacity and fatigue-resistance necessary to withstand these functional demands...
June 16, 2017: Journal of Anatomy
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