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https://www.readbyqxmd.com/read/28481956/tibial-revision-knee-arthroplasty-with-metaphyseal-sleeves-the-effect-of-stems-on-implant-fixation-and-bone-flexibility
#1
Jan Nadorf, Stefan Kinkel, Simone Gantz, Eike Jakubowitz, J Philippe Kretzer
INTRODUCTION: Revision total knee arthoplasty often requires modular implants to treat bone defects of varying severity. In some cases, it may not be clear which module size and implant combination (e.g. sleeve and stem) should be chosen for a specific defect. When balancing implant stability and osseointegration against stress-shielding, it is important to choose an appropriate implant combination in order to match the given level of bone loss. Therefore, the necessity of stems in less extensive tibial defects and the advantage of different stems (lengths and stiffnesses) in combination with large metaphyseal sleeves on implant fixation and bone flexibility using a modular tibial revision knee system, were analyzed...
2017: PloS One
https://www.readbyqxmd.com/read/28460422/effect-of-stem-sizing-and-position-on-short-term-complications-with-canine-press-fit-cementless-total-hip-arthroplasty
#2
Sarah Townsend, Stanley E Kim, Antonio Pozzi
OBJECTIVE: To determine the influence of stem sizing and positioning with early subsidence and stem complications with cementless (BFX) total hip arthroplasty (THA). STUDY DESIGN: Retrospective case series. ANIMALS: Fifty-five dogs; 58 THAs. METHODS: Eighty cobalt-chromium BFX THAs were reviewed, 58 met inclusion criteria. Implant size, positioning, and major complications within 12 months of surgery were recorded. Femoral canal flare (FCF), canal fill, stem angle, and subsidence at 3 months were measured from postoperative radiographs...
April 29, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28395945/radiographic-changes-and-clinical-outcomes-associated-with-an-adjustable-diaphyseal-press-fit-humeral-stem-in-primary-reverse-shoulder-arthroplasty
#3
Samuel M Harmsen, Tom R Norris
BACKGROUND: Press-fit humeral fixation in reverse shoulder arthroplasty (RSA) has become increasingly popular; however, radiographic analysis of these stems is limited. We aimed to evaluate the radiographic and clinical outcomes of an adjustable diaphyseal press-fit humeral stem in primary RSA. METHODS: We conducted a retrospective review of 232 primary RSAs in 219 patients performed by a single surgeon using this system. Radiographic outcomes were evaluated in patients with at least 2 years of radiographic follow-up...
April 7, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28393600/shell-design-and-reaming-technique-affect-deformation-in-mobile-bearing-total-hip-arthroplasty-acetabular-components
#4
Scott R Small, John B Meding, Jordan W Oja, Katherine S Lakstins, Danielle J Gehron, Renee D Rogge, Christine A Buckley
Press-fit acetabular components are susceptible to rim deformation. The inherent variability within acetabular reaming techniques may generate increased press-fit and, subsequently, additional component deformation. The purpose of this study was to analyze the insertion and deformation characteristics of acetabular components designed for dual-mobility systems based on component design, size, and reaming technique. Shell deformation was quantified in a validated worst-case scenario foam pinch model. Thin-walled, one-piece, and modular dual-mobility shells of varying size were implanted in under- and over-reamed cavities with insertion force measured and shell deformation assessed using digital image correlation...
April 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28391517/preoperative-digital-planning-versus-postoperative-outcomes-in-total-hip-arthroplasty-using-a-calcar-guided-short-stem-frequent-valgization-can-be-avoided
#5
Karl Philipp Kutzner, Joachim Pfeil, Mark Predrag Kovacevic
INTRODUCTION: Modern total hip arthroplasty is largely dependent on the successful preservation of hip geometry. Thus, a successful implementation of the preoperative planning is of great importance. The present study evaluates the accuracy of anatomic hip reconstruction predicted by 2D digital planning using a calcar-guided short stem of the newest generation. METHODS: A calcar-guided short stem was implanted in 109 patients in combination with a cementless cup using the modified anterolateral approach...
April 8, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/28387436/2d-3d-reconstruction-of-the-distal-femur-using-statistical-shape-models-addressing-personalized-surgical-instruments-in-knee-arthroplasty-a-feasibility-analysis
#6
Pietro Cerveri, Costanza Sacco, Gianluca Olgiati, Alfonso Manzotti, Guido Baroni
BACKGROUND: Personalized surgical instruments (PSI) have gained success in the domain of total knee replacement, demonstrating clinical outcomes similar or even superior to both traditional and navigated surgeries. The key requirement for prototyping PSI is the availability of the digital bony surface. In this paper, we aim at verifying whether the 2D/3D reconstruction of the distal femur, based on statistical shape models (SSM), grants sufficient accuracy, especially in the condylar regions, to support a PSI technique...
April 7, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28384844/morphometry-of-proximal-femur-in-indian-population
#7
Minakshi Verma, Sheetal Joshi, Anita Tuli, Shashi Raheja, Priyanka Jain, Priyanka Srivastava
INTRODUCTION: Total hip arthroplasty is a commonly performed surgery now-a-day. There are regional and racial variations in the stature of the population worldwide. So there is always need of population specific data for making best fit prosthesis. AIM: The present study was done to measure the parameters of proximal femur and to analyse their correlation by using standard statistical analysis. MATERIALS AND METHODS: Ninety one dry bones (44 left and 47 right) were used...
February 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28341265/does-a-titanium-sleeve-reduce-the-frequency-of-pseudotumors-in-metal-on-metal-total-hip-arthroplasty-at-5-7years-follow-up
#8
M H Hjorth, N Egund, I Mechlenburg, J Gelineck, S S Jakobsen, K Soballe, M Stilling
INTRODUCTION: Little is known about pseudotumor frequency and risk factors for pseudotumor formation among different types of metal-on-metal (MoM) hip arthroplasties. A lower release of chromium and cobalt have been reported in MoM hip arthroplasties with a titanium sleeve compared to MoM designs without a titanium sleeve, but yet it is unknown whether a titanium sleeve reduces the pseudotumor frequency. We conducted a cross-sectional study to investigate: 1) pseudotumor frequency, 2) risk factors of pseudotumor formation 3) and correlations between pseudotumors, serum metal-ions, implant position, and clinical symptoms...
December 2016: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28331989/does-the-tibia-component-design-affect-the-need-for-offset-stems-in-revision-total-knee-arthroplasty
#9
X Foruria, T Schmidt-Braekling, D Arana Nabarte, M Faschingbauer, M Kasparek, F Boettner
INTRODUCTION: The stem/keel location varies between anatomic and symmetric revision tibial baseplates. The current study investigates the impact of an anatomic versus symmetric stem location on the need for offset couplers in revision total knee arthroplasty. MATERIALS AND METHODS: Hip to ankle standing radiographs and lateral radiographs of 75 patients were analyzed using digital templating software. The offset in the anterior-posterior as well as medial-lateral plane between the center of the tibial diaphysis and the stem of the tibial baseplate were determined for an anatomic and symmetric tibial baseplate, respectively...
March 22, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28315184/epiphyseal-arterial-network-and-inferior-retinacular-artery-seem-critical-to-femoral-head-perfusion-in-adults-with-femoral-neck-fractures
#10
Dewei Zhao, Xing Qiu, Benjie Wang, Zihua Wang, Wei Wang, Jun Ouyang, Rona M Silva, Xiaotian Shi, Kai Kang, Dachuan Xu, Chuang Li, Shizhen Zhong, Yu Zhang, Kent E Pinkerton
BACKGROUND: A better understanding of the blood supply of the femoral head is essential to guide therapeutic strategies for patients with femoral neck fractures. However, because of the limitations of conventional techniques, the precise distribution and characteristics of intraosseous arteries of the femoral head are not well displayed. QUESTIONS/PURPOSES: To explore the characteristics and interconnections of the intraosseous vessel system between different areas of the femoral head and the possible blood supply compensatory mechanism after femoral neck fracture...
March 17, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28272256/a-morphometric-study-of-the-middle-and-lower-cervical-vertebral-endplates-and-their-components
#11
Hang Feng, Xiang-Yi Fang, Da-Geng Huang, Cheng-Cheng Yu, Hou-Kun Li, Song-Chuan Zhao, Chao-Yuan Ge, Ru-Hai Bai, Ding-Jun Hao
Cervical disc arthroplasty is a common method of treating cervical degenerative disease. However, the footprints of most prosthesis dimensions are obtained from data of Caucasian individuals. Besides, there is a large discrepancy between footprints of currently available cervical disc prostheses and anatomic dimensions of cervical endplates. We aimed to detail the three-dimensional (3D) anatomic morphology of the subaxial cervical vertebral endplate, utilizing high-precision, high-resolution scanning equipment, and provide a theoretical basis for designing appropriate disc prostheses for Chinese patients...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28271937/multiple-open-dislocations-of-the-lesser-interphalangeal-jointsa-case-report
#12
James A Wright, Nicholas Ciotola, William Spielfogel
We report on the rare case of multiple open interphalangeal dislocations. This uncommon pathologic condition results from dorsiflexion and axial loading of the digit. In the present patient, closed reduction was not possible. We review the literature on this pathologic condition and present a case of open irreducible dislocation of the lesser interphalangeal joints complicated by peripheral neuropathy and treated with resectional arthroplasty.
January 2017: Journal of the American Podiatric Medical Association
https://www.readbyqxmd.com/read/28263807/acetate-templating-on-calibrated-standing-digital-radiograph-improves-accuracy-of-preoperative-templating-for-total-hip-arthroplasty
#13
Q Wang, J Xiao, L Zhu, X Zhao, Z Liu, J Wang, Y Qin
BACKGROUND: The accuracy of preoperative templating with respect to leg length, femoral offset, and the size of femoral and acetabular components is essential to the success of total hip arthroplasty (THA). Traditionally, templating has been performed using printed film with acetate templates. However, preoperative templating designed by different prosthetic manufacturers cannot be used directly on the film due to varying acetate template amplification ratios. Computer-based templating needs specialized digital templating software, which has cost implications...
May 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28251122/templating-in-uncemented-total-hip-arthroplasty-on-intra-and-interobserver-reliability-and-professional-experience
#14
Nils J Strøm, Are Hugo Pripp, Olav Reikerås
BACKGROUND: This study examines the intra-, and interobserver reliability of digital templating in uncemented total hip arthroplasty (THA), and assesses whether these values are dependent on professional experience. METHODS: Three independent observers retrospectively examined digital X-rays of 34 consecutive hips scheduled for uncemented THA. These were templated using templating software. Evaluations were carried out on two occasions at least 6 weeks apart. Findings were compared to each surgeon's own findings, and then to the other surgeons' findings...
February 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28241434/data-collection-and-analysis-using-wearable-sensors-for-monitoring-knee-range-of-motion-after-total-knee-arthroplasty
#15
Chih-Yen Chiang, Kun-Hui Chen, Kai-Chun Liu, Steen Jun-Ping Hsu, Chia-Tai Chan
Total knee arthroplasty (TKA) is the most common treatment for degenerative osteoarthritis of that articulation. However, either in rehabilitation clinics or in hospital wards, the knee range of motion (ROM) can currently only be assessed using a goniometer. In order to provide continuous and objective measurements of knee ROM, we propose the use of wearable inertial sensors to record the knee ROM during the recovery progress. Digitalized and objective data can assist the surgeons to control the recovery status and flexibly adjust rehabilitation programs during the early acute inpatient stage...
February 22, 2017: Sensors
https://www.readbyqxmd.com/read/28198543/deformation-of-the-zurich-cementless-acetabular-cup-caused-by-implantation-in-a-canine-cadaver-model
#16
Geoffrey D Panjeton, Stanley E Kim, Kelvin Chang, Lindsey S Palm, Peter G Ifju
OBJECTIVE: To evaluate the change in geometry of the Zurich total hip arthroplasty (THA) acetabular component after implantation. ANIMALS: Hemipelves from adult mix-breed dogs weighing between 20 and 25 kg. METHODS: Digital image correlation imaging was performed prior to, immediately after, and 24 hours after impaction of Zurich THA acetabular component, and after removal of the cup from the specimen. Patterns of deformation were qualitatively described, and maximal deformations were compared between time points...
April 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28196435/dynamic-assessment-of-the-wrist-after-total-wrist-arthroplasty
#17
H P Singh, D Bhattacharjee, J J Dias, I Trail
Our aim was to assess the outcome in patients with total wrist arthroplasty performed for end stage wrist osteoarthritis. We analysed the ranges of motion of operated and un-operated wrists using a flexible electrogoniometer during the Sollerman hand function test. We assessed grip strength with a digital dynamometer and completed patient reported outcome scores more than one year post-operatively. We reviewed 12 patients with a mean age of 64 (range 48-82) years. The flexion-extension arc was 72% and radioulnar deviation arc was 53% of the un-operated side but the total range of motion (area of circumduction) was 43% of the un-operated side and only 20% of the circumduction in age and gender-matched normal volunteers...
February 1, 2017: Journal of Hand Surgery, European Volume
https://www.readbyqxmd.com/read/28159312/effects-of-anterior-offsetting-of-humeral-head-component-in-posteriorly-unstable-total-shoulder-arthroplasty-finite-element-modeling-of-cadaver-specimens
#18
Gregory S Lewis, William K Conaway, Hwabok Wee, H Mike Kim
A novel technique of "anterior offsetting" of the humeral head component to address posterior instability in total shoulder arthroplasty has been proposed, and its biomechanical benefits have been previously demonstrated experimentally. The present study sought to characterize the changes in joint mechanics associated with anterior offsetting with various amounts of glenoid retroversion using cadaver specimen-specific 3-dimensional finite element models. Specimen-specific computational finite element models were developed through importing digitized locations of six musculotendinous units of the rotator cuff and deltoid muscles based off three cadaveric shoulder specimens implanted with total shoulder arthroplasty in either anatomic or anterior humeral head offset...
February 28, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28144576/digital-templating-in-total-hip-arthroplasty-additional-anteroposterior-hip-view-increases-the-accuracy
#19
Sophia K Stigler, Franz J Müller, Sebastian Pfaud, Michael Zellner, Bernd Füchtmeier
AIM: To analyze planning total hip arthroplasty (THA) with an additional anteroposterior hip view may increases the accuracy of preoperative planning in THA. METHODS: We conducted prospective digital planning in 100 consecutive patients: 50 of these procedures were planned using pelvic overview only (first group), and the other 50 procedures were planned using pelvic overview plus antero-posterior (a.p.) hip view (second group). The planning and the procedure of each patient were performed exclusively by the senior surgeon...
January 18, 2017: World Journal of Orthopedics
https://www.readbyqxmd.com/read/28108173/broach-handle-design-changes-force-distribution-in-the-femur-during-total-hip-arthroplasty
#20
Dustin A Greenhill, Pooyan Abbasi, Kurosh Darvish, Andrew M Star
BACKGROUND: Curved broach handles were developed to overcome limited surgical exposures during total hip arthroplasty. Some authors report increased intraoperative fracture rates during limited exposures. This study evaluates mechanical force ratios transmitted to the bone while broaching with curved vs straight handles. METHODS: An experimental model utilized a 6-axis load cell to measure force distributions produced by 4 different broach handles, each with increasing offset and curvature...
December 29, 2016: Journal of Arthroplasty
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