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https://www.readbyqxmd.com/read/27916578/patellar-component-design-influences-size-selection-and-coverage
#1
Charlie C Yang, Douglas A Dennis, Patrick G Davenport, Raymond H Kim, Todd M Miner, Derek R Johnson, Peter J Laz
BACKGROUND: Patellofemoral (PF) complications following total knee arthroplasty continue to occur. Outcomes are influenced by implant design, size and alignment in addition to patient factors. The objective of this study was to assess the effect of implant design, specifically round versus oval dome patellar components, on size selected and bony coverage in a population of 100 patients. METHODS: Intraoperative assessments of patella component size were performed using surgical guides for round and oval designs...
December 1, 2016: Knee
https://www.readbyqxmd.com/read/27858087/three-dimensional-analysis-of-the-proximal-humeral-and-glenoid-geometry-using-microscribe-3d-digitizer
#2
Wejdan H Owaydhah, Mohammad A Alobaidy, Abdulrahman S Alraddadi, Roger W Soames
PURPOSE: To understand the geometry of the proximal humerus and glenoid fossa to facilitate the design of components used in shoulder arthroplasty. The aim is to evaluate the geometry of the proximal humerus and glenoid fossa and their relationship using a MicroScribe 3D digitizer. METHODS: Scans and measurements were obtained from 20 pairs of dry proximal humeri and scapulae [10 female and 10 male cadavers: median age 81 years (range 70-94 years)] using a MicroScribe 3D digitizer and Rhinoceros software...
November 17, 2016: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/27834448/tibial-revision-knee-arthroplasty-influence-of-modular-stems-on-implant-fixation-and-bone-flexibility-in-aori-type-t2a-defects
#3
Jan Nadorf, Simone Gantz, Konner Kohl, Jan P Kretzer
BACKGROUND: Due to the varying bone defects presented to surgeons during revision total knee arthroplasty, modular implant systems are preferred over standard implant designs. However, every implant combination (sleeves, stems and augments) can affect the fixation in different ways and thus influence the long-term outcome. We therefore aimed to analyze the effect of large metaphyseal sleeves with and without short modular stems on implant fixation and bone flexibility of a modular tibial revision knee system...
November 29, 2016: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/27823803/full-field-measurement-of-micromotion-around-a-cementless-femoral-stem-using-micro-ct-imaging-and-radiopaque-markers
#4
V Malfroy Camine, H A Rüdiger, D P Pioletti, A Terrier
A good primary stability of cementless femoral stems is essential for the long-term success of total hip arthroplasty. Experimental measurement of implant micromotion with linear variable differential transformers is commonly used to assess implant primary stability in pre-clinical testing. But these measurements are often limited to a few distinct points at the interface. New techniques based on micro-computed tomography (micro-CT) have recently been introduced, such as Digital Volume Correlation (DVC) or markers-based approaches...
October 27, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27807289/the-regionalization-of-total-ankle-arthroplasties-and-ankle-fusions-in-new-york-state-a-10-year-comparative-analysis
#5
John A Buza, James X Liu, Jeffrey Jancuska, Joseph A Bosco
: Background Total ankle arthroplasty (TAA) provides an alternative to ankle fusion (AF). The purpose of this study is to (1) determine the extent of TAA regionalization, as well as examine the growth of TAA performed at high-, medium-, and low-volume New York State institutions and (2) compare this regionalization and growth with AF. Methods The New York Statewide Planning and Research Cooperative System (SPARCS) administrative data were used to identify 737 primary TAA and 7453 AF from 2005 to 2014...
November 1, 2016: Foot & Ankle Specialist
https://www.readbyqxmd.com/read/27793497/cementless-tapered-wedge-femoral-stems-decrease-subsidence-in-obese-patients-compared-to-traditional-fit-and-fill-stems
#6
Tanner W Grant, Luke R Lovro, David J Licini, Lucian C Warth, Mary Ziemba-Davis, Robert M Meneghini
BACKGROUND: Femoral component stability and resistance to subsidence is critical for osseointegration and clinical success in cementless total hip arthroplasty. The purpose of this study was to radiographically evaluate the anatomic fit and subsidence of 2 different proximally tapered, porous-coated modern cementless femoral component designs. METHODS: A retrospective cohort study of 126 consecutive cementless total hip arthroplasties was performed. Traditional fit-and-fill stems were implanted in the first 61 hips with the remaining 65 receiving morphometric tapered wedge stems...
September 28, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27791237/preoperative-planning-of-total-hip-arthroplasty-on-dysplastic-acetabuli
#7
Dror Lakstein, Zachary Tan, Nugzar Oren, Tatu Johannes Mäkinen, Allan E Gross, Oleg Safir
BACKGROUND: When performing total hip arthroplasty (THA) on a dysplastic hip, proper positioning of the acetabular component may not allow for more than 70% coverage. Structural support in the form of an autograft or a high porosity metal augment may be necessary. The purpose of the study was to investigate the value of preoperative templating and deformity classification in predicting cup coverage and the need for structural support. METHODS: 65 cases of THA for DDH were retrospectively analysed...
October 24, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27776900/effect-of-body-mass-index-on-digital-templating-for-total-hip-arthroplasty
#8
Robert A Sershon, Alejandro Diaz, Daniel D Bohl, Brett R Levine
BACKGROUND: Digital templating is becoming more prevalent in orthopedics. Recent investigations report high accuracy using digital templating in total hip arthroplasty (THA); however, the effect of body mass index (BMI) on templating accuracy is not well described. METHODS: Digital radiographs of 603 consecutive patients (645 hips) undergoing primary THA by a single surgeon were digitally templated using OrthoView (Jacksonville, FL). A 25-mm metallic sphere was used as a calibration marker...
September 28, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27745804/rotator-cuff-sparing-approaches-for-glenohumeral-joint-access-an-anatomic-feasibility-study
#9
Tressa D Amirthanayagam, Andrew A Amis, Peter Reilly, Roger J H Emery
BACKGROUND: The deltopectoral approach for total shoulder arthroplasty can result in subscapularis dysfunction. In addition, glenoid wear is more prevalent posteriorly, a region difficult to access with this approach. We propose a posterior approach for access in total shoulder arthroplasty that uses the internervous interval between the infraspinatus and teres minor. This study compares this internervous posterior approach with other rotator cuff-sparing techniques, namely, the subscapularis-splitting and rotator interval approaches...
October 10, 2016: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/27720559/humeral-head-osteotomy-in-shoulder-arthroplasty-a-comparison-between-anterosuperior-and-inferoanterior-resection-techniques
#10
Thomas Suter, Christopher W Kolz, Robert Z Tashjian, Heath B Henninger, Ariane Gerber Popp
BACKGROUND: The best chance that a shoulder arthroplasty will restore motion and muscle balance across the glenohumeral joint is by closely replicating natural articular morphology. Defining the humeral osteotomy plane along clear landmarks at the anatomic neck is critical. We hypothesized that a new osteotomy, based on alternative landmarks on the anatomic neck, would restore 3-dimensional humeral head morphology more reliably than the traditional osteotomy. METHODS: The anatomic neck was digitized in 30 human cadaver shoulders and compared with its 3-dimensional computed tomography reconstruction...
October 6, 2016: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/27717976/coexisting-sarcoidal-granulomatous-inflammation-and-diffuse-tenosynovial-giant-cell-tumor-of-the-knee-after-a-total-knee-replacement-a-case-report
#11
Yaxia Zhang, Michael Joyce, Jean Schils, Thomas W Bauer
Sarcoidosis is a systemic inflammatory disorder characterized by non-caseating granulomas, predominantly involving lung, mediastinal lymph nodes and other organs. Synovium involvement is infrequent, and as far as we know, involvement of a periprosthetic membrane has not been reported in the English literature. Intra-articular diffuse tenosynovial giant cell tumor ("conventional diffuse pigmented villonodular synovitis") is an uncommon, locally aggressive neoplasm with few previous case reports in which it arose in periprosthetic tissues after knee arthroplasty...
October 7, 2016: Skeletal Radiology
https://www.readbyqxmd.com/read/27716136/linking-swedish-health-data-registers-to-establish-a-research-database-and-a-shared-decision-making-tool-in-hip-replacement
#12
Peter Cnudde, Ola Rolfson, Szilard Nemes, Johan Kärrholm, Clas Rehnberg, Cecilia Rogmark, John Timperley, Göran Garellick
BACKGROUND: Sweden offers a unique opportunity to researchers to construct comprehensive databases that encompass a wide variety of healthcare related data. Statistics Sweden and the National Board of Health and Welfare collect individual level data for all Swedish residents that ranges from medical diagnoses to socioeconomic information. In addition to the information collected by governmental agencies the medical profession has initiated nationwide Quality Registers that collect data on specific diagnoses and interventions...
October 4, 2016: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/27713104/quantitative-morphometric-study-of-the-subaxial-cervical-vertebrae-end-plate
#13
Hang Feng, Xiangyi Fang, Dageng Huang, Chengcheng Yu, Songchuan Zhao, Dingjun Hao
BACKGROUND CONTEXT: Cervical disc arthroplasty has been gradually adopted as an alternative for the treatment of cervical degenerative disease. However, there is a large discrepancy between footprints of currently available cervical disc prostheses and anatomic dimensions of cervical end plates. PURPOSE: This study aimed to accurately and comprehensively quantify the three-dimensional (3D) anatomic morphology of the cervical vertebral end plate and provide a theoretical basis for designing appropriate disc prostheses...
October 3, 2016: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/27705056/in-vivo-kinematics-of-healthy-and-osteoarthritic-knees-during-stepping-using-density-based-image-matching-techniques
#14
Satoshi Hamai, Ken Okazaki, Satoru Ikebe, Koji Murakami, Hidehiko Higaki, Hiroyuki Nakahara, Takeshi Shimoto, Hideki Mizu-Uchi, Yukio Akasaki, Yukihide Iwamoto
The purpose of this study was to investigate in vivo kinematics in healthy and osteoarthritic (OA) knees during stepping using image-matching techniques. Six healthy volunteers and fourteen patients with medial OA knee before undergoing total knee arthroplasty performed stepping under periodic anteroposterior X-ray images. We analyzed the three-dimensional kinematic parameters of knee joints using X-ray images and CT-derived digitally reconstructed radiographs. The average extension/flexion angle ranged 6°/53° and 16°/44° in healthy and OA knees with significant difference in extension (p = ...
October 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27704157/different-synovial-vasculogenic-profiles-of-primary-rapidly-destructive-and-osteonecrosis-induced-hip-osteoarthritis-an-immunohistochemistry-study
#15
Simona Gurzu, Sabin Gligore Turdean, Sorin Tudor Pop, Ancuta Zazgyva, Ciprian Oliviu Roman, Mihaela Opris, Ioan Jung
PURPOSE: To present a hypothesis regarding the pathways of angiogenesis in primary versus secondary hip osteoarthritis (OA). METHODS: In synovial tissue samples provided by 57 consecutive patients who underwent hip arthroplasty, immunohistochemical examinations were performed using the following angiogenesis-related antibodies: VEGF-A, COX-2, maspin and the endothelial cells markers CD31 and CD105. The cases were divided into three categories: classic primary hip OA (group A; n = 16), rapidly destructive hip OA (group B; n = 24) and hip OA secondary to avascular osteonecrosis of the femoral head (group C; n = 17)...
October 4, 2016: International Orthopaedics
https://www.readbyqxmd.com/read/27703415/handheld-navigation-device-and-patient-specific-cutting-guides-result-in-similar-coronal-alignment-for-primary-total-knee-arthroplasty-a-retrospective-matched-cohort-study
#16
Michael E Steinhaus, Alexander S McLawhorn, Shawn S Richardson, Patrick Maher, David J Mayman
BACKGROUND: Proper alignment of total knee arthroplasty (TKA) is essential for TKA function and may reduce the risk of aseptic failure. Technologies that prevent malalignment may reduce the risk of revision surgery. QUESTIONS/PURPOSES: The purpose of this study was to compare two competing TKA systems that purport improved alignment: patient-specific instrumentation (PSI), and a handheld portable navigation device (NAV). METHODS: After IRB approval, 49 consecutive PSI TKAs (40 patients) were matched based on preoperative characteristics to 49 NAV TKAs (40 patients) performed by a single surgeon...
October 2016: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
https://www.readbyqxmd.com/read/27589968/digital-tomosynthesis-with-metal-artifact-reduction-for-assessing-cementless-hip-arthroplasty-a-diagnostic-cohort-study-of-48-patients
#17
Hao Tang, Dejin Yang, Shengjie Guo, Jing Tang, Jian Liu, Dacheng Wang, Yixin Zhou
OBJECTIVES: For postoperative imaging assessment of cementless hip arthroplasty, radiography and computed tomography (CT) were restricted by overlapping structures and metal artifacts, respectively. A new tomosynthesis with metal artifact reduction (TMAR) is introduced by using metal extraction and ordered subset-expectation maximization (OS-EM) reconstruction. This study investigated the effectiveness of TMAR in assessing fixation stability of cementless hip arthroplasty components. MATERIALS AND METHODS: We prospectively included 48 consecutive patients scheduled for revision hip arthroplasty in our hospital, with 41 femoral and 35 acetabular cementless components available for evaluation...
November 2016: Skeletal Radiology
https://www.readbyqxmd.com/read/27528854/intrusion-characteristics-of-high-viscosity-bone-cements-for-the-tibial-component-of-a-total-knee-arthroplasty-using-negative-pressure-intrusion-cementing-technique
#18
Nam L Dinh, Alexander Cm O'Chong, Justin K Walden, Scott C Adrian, Robert P Cusick
BACKGROUND: With the advent of new bone cements with different viscosities, it is important to understand how they respond to different cementing techniques. The purpose of this study was to evaluate the high viscosity (HV) bone cement intrusion characteristics comparing negative pressure intrusion technique (NPI) and finger-packing technique in a cadaveric proximal tibial bone. METHODS: Soft tissues were removed from twenty- four fresh frozen cadaver proximal tibiae, and standard arthroplasty tibial cuts were performed...
2016: Iowa Orthopaedic Journal
https://www.readbyqxmd.com/read/27518289/intrusion-characteristics-of-three-bone-cements-for-tibial-component-of-total-knee-arthroplasty-in-a-cadaveric-bone-model
#19
Justin K Walden, Alexander C M Chong, Nam L Dinh, Scott Adrian, Robert Cusick, Paul H Wooley
The purpose of this study was to evaluate and compare the intrusion characteristics of Simplex-HV to Simplex-P and Palacos-R in cadaveric proximal tibial bone. Eighteen fresh-frozen cadaver proximal tibiae were examined with standard arthroplasty tibial cuts. Each tibia was randomly assigned to receive one of the three bone cements for use with finger packing technique. Sagittal sections were prepared and analyzed using digital photography and stereoscopic micrographs to evaluate cement intrusion characteristics...
2016: Journal of Surgical Orthopaedic Advances
https://www.readbyqxmd.com/read/27504651/wear-analysis-of-second-generation-highly-cross-linked-polyethylene-in-primary-total-hip-arthroplasty
#20
Christopher Samujh, Samrath Bhimani, Langan Smith, Arthur L Malkani
A major limiting factor in the longevity of total hip replacement is the wear rate of the hip bearing. As manufacturing technology has improved during the past several decades, much attention has been focused on developing newer generations of polyethylene that have lower rates of wear while minimizing free radical formation and subsequent osteolysis. The turning point for the manufacture of polyethylene was moving from gamma irradiation in air to irradiation in a low oxygen environment, which reduced free radical formation while increasing the wear resistance...
November 1, 2016: Orthopedics
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