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https://www.readbyqxmd.com/read/28545175/the-effect-of-sagittal-knee-deformity-on-preoperative-measurement-of-coronal-mechanical-alignment-during-total-knee-arthroplasty
#1
Gautam M Shetty, Arun Mullaji, Ahmed Adel Khalifa, Abhik Ray, Vivek Nikumbha
Purpose: The purpose of this prospective study was to determine correlation between coronal mechanical alignment measured on preoperative standing full-length radiographs and navigation during total knee arthroplasty (TKA) in the presence of an associated sagittal deformity (hyperextension and flexion deformity). Materials and Methods: Coronal mechanical alignment measured on preoperative, standing, full-length, hip-to-ankle anteroposterior radiographs was compared with intraoperative measurements recorded with computer navigation in 200 primary navigated TKAs...
June 1, 2017: Knee Surgery & related Research
https://www.readbyqxmd.com/read/28542100/global-spinal-alignment-in-patients-with-cervical-spondylotic-myelopathy
#2
Go Yoshida, Abdulmajeed Alzakri, Vincent Pointillart, Louis Boissiere, Ibrahim Obeid, Yukihiro Matsuyama, Jean Marc Vital, Olivier Gille
STUDY DESIGN: Prospective radiographic analysis of cervical spondylotic myelopathy (CSM) OBJECTIVE.: To clarify the pathophysiology of CSM, and use the characteristic of global spinal alignment for determining the surgical strategy. SUMMARY OF BACKGROUND DATA: Radiographic evaluation of CSM, in general, comprises cervical magnetic resonance imaging (MRI) and regional cervical radiography, which cannot distinguish between cervical hyperlodorsis with spinopelvic compensation and cervical lordorsis with normal global alignment...
May 24, 2017: Spine
https://www.readbyqxmd.com/read/28534290/wear-predictions-for-uhmwpe-material-with-various-surface-properties-used-on-the-femoral-component-in-total-knee-arthroplasty-a-computational-simulation-study
#3
Kyoung-Tak Kang, Juhyun Son, Ho-Joong Kim, Changhyun Baek, Oh-Ryong Kwon, Yong-Gon Koh
The wear of ultrahigh-molecular weight polyethylene (UHMWPE) tibial inserts in total knee arthroplasty (TKA) remains a major limitation that hinders the longevity of clinically successful devices. Surface properties significantly affect the overall performance of TKA, and surface modification with mechanically and chemically stable materials is an effective method for overcoming the wear of TKA. However, wear tests are not cost-efficient or time-efficient; thus, the effects of geometric, loading, and alignment perturbations are often evaluated via parametric studies...
July 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28533592/articular-chondrocyte-alignment-in-the-rat-after-surgically-induced-osteoarthritis
#4
Hideaki Takahashi, Hiroyuki Tamaki, Noriaki Yamamoto, Hideaki Onishi
[Purpose] Chondrocytes in articular cartilage are aligned as columns from the joint surface. Notably, loss of chondrocyte and abnormalities of differentiation factors give rise to osteoarthritis (OA). However, the relationship between chondrocyte alignment and OA progression remains unclear. This study was performed to investigate temporal alterations in surgically-induced OA rats. [Subjects and Methods] Thirteen-week-old Wistar rats (n=30) underwent destabilized medial meniscus surgery in their right knee and sham surgery in their left knee...
April 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28532997/the-influence-of-varus-and-valgus-deviation-on-patellar-kinematics-in-healthy-knees-an-exploratory-cadaver-study
#5
Michael Worlicek, Benedikt Moser, Günther Maderbacher, Raphael Zentner, Florian Zeman, Joachim Grifka, Armin Keshmiri
BACKGROUND: Patellofemoral instability may lead to osteoarthritis, anterior knee pain, and patellar luxation. The purpose of this study was to conduct an exploratory investigation into the difference of patellar kinematics of healthy knees during extension/flexion cycles in neutral, varus and valgus alignment. METHODS: The three-dimensional patellar kinematics of 10 lower extremities of whole body cadavers were examined during passive motion, in neutral position, and under valgus and varus stress...
May 19, 2017: Knee
https://www.readbyqxmd.com/read/28532505/do-small-changes-in-rotation-affect-measurements-of-lower-extremity-limb-alignment
#6
Amir A Jamali, John P Meehan, Nathan M Moroski, Matthew J Anderson, Ramit Lamba, Carol Parise
BACKGROUND: The alignment of the lower extremity has important implications in the development of knee arthritis. The effect of incremental rotations of the limb on common parameters of alignment has not been studied. The purpose of the study was to (1) determine the standardized neutral position measurements of alignment and (2) determine the effect of rotation on commonly used measurements of alignment. METHODS: Eighty-seven full length CT angiography studies (49 males and 38 females, average age 66 years old) were included...
May 22, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28530120/osteochondral-allograft-transplantation-and-opening-wedge-tibial-osteotomy-clinical-results-of-a-combined-single-procedure
#7
Albert C Hsu, Luis E P Tirico, Abraham G Lin, Pamela A Pulido, William D Bugbee
Objective To evaluate the outcome of patients who have undergone simultaneous osteotomy and osteochondral allograft (OCA) transplantation. Our hypothesis is that use of high tibial osteotomy and fresh OCA in a combined procedure is safe and effective without increasing morbidity in comparison to OCA alone. Design A case series of 17 patients underwent tibial osteotomy and simultaneous OCA during a single surgery. Osteotomy was indicated when axial alignment was within the affected compartment. Patients had a minimum of 2 years of follow-up after surgery...
May 1, 2017: Cartilage
https://www.readbyqxmd.com/read/28521382/-coincidence-and-therapy-of-dysalignments-and-degenerative-knee-cartilage-lesions-results-from-the-german-cartilageregistry-dgou
#8
Gunter Spahn, Jürgen Fritz, Dirk Albrecht, Peter Angele, Stefan Fickert, Matthias Aurich, Gunther O Hofmann, Phillip Niemeyer
Purpose This multicenter study was aimed to evaluate the coincidence of degenerative knee cartilage lesions with a varus or valgus dysalignment. Furthermore, the frequency of the combined surgery of cartilage treatments and corrective osteotomies are determined. Material and Methods A total of 1778 patients were included in the German CartilageRegistry (deadline 01.08.2016). In 90.6% of patients, the surgeon calculated the alignment by clinical observation. Varus or valgus conditions were measured radiologically in only 56...
May 18, 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/28503290/use-of-the-suprapatellar-approach-in-intramedullary-nailing-of-a-multi-fragmentary-dislocated-tibia-fracture-with-a-hypermobile-intermediate-fragment-in-a-young-patient
#9
Patrick Haubruck, Ulf Brunnemer, Arash Moghaddam, Gerhard Schmidmaier
A case of an adolescent female patient who suffered from first grade open multi-fragment fracture of the tibia (AO42-C2) with a large hypermobile intermediate fragment is presented in this case report. Intramedullary nailing of the tibia remains the treatment of choice despite a high risk of malformation and anterior knee pain especially in multi-fragment fractures. Here the suprapatellar approach as a semiextended nailing technique seems favorable. The specialty in our case was an early change of procedures necessary due to persistent swelling during external fixation based on the hypermobile intermediate fragment...
November 17, 2016: Orthopedic Reviews
https://www.readbyqxmd.com/read/28502570/a-comparison-of-short-term-radiological-alignment-outcomes-of-the-patient-specific-and-standard-instrumentation-for-primary-total-knee-arthroplasty-a-systematic-review-and-meta-analysis
#10
Ilhan Alcelik, Mark Blomfield, Cenk Öztürk, Ashish Soni, Richard Charity, Alex Acornley
OBJECTIVE: The aim of this study was to review the radiological alignment outcomes of patient Specific (PS) cutting blocks and Standard Instrumentation in Primary Total Knee Arthroplasty. METHODS: We hypothesized that the use of PS techniques would significantly improve sagittal, coronal and rotational alignment of the prosthesis on short term. We performed a systematic review and a meta-analysis including all the randomised controlled trials (RCT) using PS and standard (ST) total knee arthroplasty to date...
May 11, 2017: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/28502536/results-of-a-modular-revision-system-in-total-knee-arthroplasty
#11
David A Crawford, Keith R Berend, Michael J Morris, Joanne B Adams, Adolph V Lombardi
BACKGROUND: Revision total knee arthroplasty (TKA) poses unique challenges compared with primary TKA such as bone loss, deformity, and ligament instability. Modular component options allow flexibility to deal with these complexities. The purpose of this study was to evaluate midterm outcomes for revision TKA using a modular revision knee system with complete interchangeability and multiple options for augmentation, offset, constraint, and stem extensions. METHODS: A query of our practice registry revealed 257 consented patients (274 knees and 278 TKA) with minimum 2-year follow-up who underwent aseptic revision TKA with a modular system (Vanguard Super Stabilized Knee; Zimmer Biomet, Warsaw, IN) between 2005 and 2013...
April 10, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28500496/patient-specific-instrumentation-improves-alignment-of-lateral-unicompartmental-knee-replacements-by-novice-surgeons
#12
Chin Ting Justin Ng, Simon Newman, Simon Harris, Susannah Clarke, Justin Cobb
PURPOSE: Patient-specific instrumentation (PSI) has the potential to offer numerous benefits-not least of all, improved resection accuracy; but its potential has not been realised in clinical studies. An explanation may be the focus of such studies on the total knee replacement (TKR-a common procedure, with which surgeons are generally very familiar. Consequently, we sought to investigate the potential role of PSI in guiding novice surgeons to perform the more technically demanding and less familiar lateral unicondylar knee replacement (LUKR)...
May 13, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28493211/what-mechanisms-are-associated-with-tibial-component-failure-after-kinematically-aligned-total-knee-arthroplasty
#13
Alexander J Nedopil, Stephen M Howell, Maury L Hull
PURPOSE: Eight patients treated with kinematically-aligned (KA) total knee arthroplasty (TKA) presented with tibial component failure. We determined whether radiographic measurements and clinical characteristics are different between patients with and without tibial component failure to identify mechanisms of failure and strategies to reduce the risk. METHODS: Out of 3,212 primary TKAs (2,725 TKAs with a two-year minimum follow up), of which all were performed with KA, eight patients presented with tibial component failure...
May 11, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28488001/lateral-displacement-sulcus-angle-and-trochlear-angle-are-associated-with-early-patellofemoral-osteoarthritis-following-anterior-cruciate-ligament-reconstruction
#14
Erin M Macri, Adam G Culvenor, Hayden G Morris, Timothy S Whitehead, Trevor G Russell, Karim M Khan, Kay M Crossley
PURPOSE: Patellofemoral osteoarthritis (PFOA) occurs in approximately half of anterior cruciate ligament (ACL)-injured knees within 10-15 years of trauma. Risk factors for post-traumatic PFOA are poorly understood. Patellofemoral alignment and trochlear morphology may be associated with PFOA following ACL reconstruction (ACLR), and understanding these relationships, particularly early in the post-surgical time period, may guide effective early intervention strategies. In this study, patellofemoral alignment and trochlear morphology were investigated in relation to radiographic features of early PFOA 1-year post-ACLR...
May 9, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28484791/varus-femoral-and-tibial-coronal-alignments-result-in-different-kinematics-and-kinetics-after-total-knee-arthroplasty
#15
Mutsumi Watanabe, Shinichi Kuriyama, Shinichiro Nakamura, Yoshihisa Tanaka, Kohei Nishitani, Moritoshi Furu, Hiromu Ito, Shuichi Matsuda
PURPOSE: Abnormal knee motion under various conditions has been described after total knee arthroplasty (TKA). However, differences in kinematics and kinetics of knees with varus femoral versus varus tibial alignment have not been evaluated. It was hypothesized that varus femoral and tibial alignments have the same impact on knee motion. METHODS: A musculoskeletal computer simulation was used. Femoral and tibial alignment in the coronal plane was each varied from neutral to 5° of varus in 1° increments...
May 8, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28467105/the-role-of-cone-beam-ct-in-the-study-of-symptomatic-total-knee-arthroplasty-tka-a-20-cases-report
#16
Cosimo Nardi, Roberto Buzzi, Roberto Molteni, Carlo Cossi, Chiara Lorini, Linda Calistri, Stefano Colagrande
OBJECTIVES: Evaluate the efficacy of Cone Beam Computed Tomography (CBCT) in the study of the patellar tilt angle and the rotational alignment of the femoral/tibial component, after total knee arthroplasty (TKA). Another aim of this study was to estimate how metallic artefacts impaired the detection of the periprosthetic bone structures and bordering tendon-muscle structures. METHODS: Twenty symptomatic TKAs were examined with CBCT by three independent observers...
May 3, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28465849/mobile-bearing-total-knee-arthroplasty-for-valgus-knee-osteoarthritis-with-permanent-patellar-dislocation-a-case-report-and-review-of-the-literature
#17
Kohei Kamada, Tomoyuki Matsumoto, Koji Takayama, Daisuke Araki, Shingo Hashimoto, Shinya Hayashi, Takehiko Matsushita, Ryosuke Kuroda
Permanent patellar dislocation with tibiofemoral joint osteoarthritis is a relatively rare condition. To treat this condition, total knee arthroplasty with proximal or distal realignment of the extensor mechanism has been reported. We report a challenging case of an 80-year-old woman diagnosed with permanent patellar dislocation with tibiofemoral joint osteoarthritis treated by a mobile bearing total knee arthroplasty utilizing navigation system. Lateral retinaculum release was performed to improve patellar tracking; other proximal or distal realignment of the extensor mechanism was not necessary...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/28460410/comparative-study-for-alignment-of-extramedullary-guides-versus-portable-accelerometer-based-navigation-in-total-knee-arthroplasty
#18
Kazu Matsumoto, Hiroyasu Ogawa, Masashi Fukuta, Nobuyuki Mori, Haruhiko Akiyama
The use of portable, accelerometer-based navigation (PN) devices for positioning of the components of total knee arthroplasty (TKA) is emerging as an alternative to standard extramedullary (EM) systems, which was needed to the image intensifier. The aim of our study was to compare the accuracy of component positioning in TKA using an EM and PN systems. Data from 100 consecutive primary TKAs, performed by multiple surgeons in 87 patients between October 2010 and June 2015, were analyzed. Coronal and sagittal plane alignments of the TKA components, relative to the mechanical axis of the limb, were evaluated by radiography...
May 1, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28460408/does-kinematic-alignment-improve-short-term-functional-outcomes-after-total-knee-arthroplasty-compared-with-mechanical-alignment-a-systematic-review-and-meta-analysis
#19
Yanhong Li, Shuanke Wang, Yuliang Wang, Mingxuan Yang
This meta-analysis was conducted to study whether kinematically aligned total knee arthroplasty (TKA) improves short-term functional outcomes compared with mechanical alignment without changing the hip-knee-ankle angle. Prospective cohort studies were searched from electronic literature databases, including PubMed, Web of Science, Embase (Ovid interface), and Cochrane Library (Ovid interface). Total 1,159 records were identified. Six trials involving 561 patients were eligible for data extraction and meta-analysis...
May 1, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28455730/knee-abduction-affects-greater-magnitude-of-change-in-acl-and-mcl-strains-than-matched-internal-tibial-rotation-in-vitro
#20
Nathaniel A Bates, Rebecca J Nesbitt, Jason T Shearn, Gregory D Myer, Timothy E Hewett
BACKGROUND: Anterior cruciate ligament (ACL) injures incur over USD 2 billion in annual medical costs and prevention has become a topic of interest in biomechanics. However, literature conflicts persist over how knee rotations contribute to ACL strain and ligament injury. To maximize the efficacy of ACL injury prevention, the effects of underlying mechanics need to be better understood. QUESTIONS/PURPOSES: We applied robotically controlled, in vivo-derived kinematic stimuli to the knee to assess ligament biomechanics in a cadaver model...
April 28, 2017: Clinical Orthopaedics and related Research
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