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https://www.readbyqxmd.com/read/29129614/mid-term-clinical-functional-and-radiographic-outcomes-of-105-gender-specific-patellofemoral-arthroplasties-with-or-without-the-association-of-medial-unicompartmental-knee-arthroplasty
#1
Sergio Romagnoli, Matteo Marullo
BACKGROUND: The purpose of this study is to evaluate clinical and radiographic outcomes after gender-specific patellofemoral arthroplasty (PFA) either isolated or combined with unicompartmental knee arthroplasty (UKA). METHODS: A total of 105 PFAs in 85 patients were reviewed: 64 knees had isolated patellofemoral osteoarthritis and received an isolated PFA, and 41 knees with bicompartmental osteoarthritis were treated with medial UKA and PFA. Preoperative and postoperative clinical and functional assessment included knee range of motion, Knee Society Score, University of California Los Angeles Activity Score, Tegner Activity Level Scale, and visual analogue scale pain...
October 24, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29124363/reduced-joint-awareness-in-bicruciate-retaining-total-knee-arthroplasty-compared-to-cruciate-sacrificing-total-knee-arthroplasty
#2
Florian Baumann, Werner Krutsch, Michael Worlicek, Maximilian Kerschbaum, Johannes Zellner, Paul Schmitz, Michael Nerlich, Carsten Tibesku
PURPOSE: There is rising impact of patient-reported outcome (PRO) measurement in joint arthroplasty over the past years. Bicruciate-retaining implants have shown more physiologic knee kinematics and provide superior proprioceptive capacities. The aim of this study was to evaluate if the functional properties of this new implant design lead to improved PRO results after total knee arthroplasty (TKA). METHODS: This prospective, controlled trial compares PRO of bicruciate-retaining total knee arthroplasty (BCR-TKA) to unicondylar knee arthroplasty (UKA) and standard posterior-stabilized total knee arthroplasty (PS-TKA)...
November 9, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29124288/the-medial-tibial-joint-line-elevation-over-5%C3%A2-mm-restrained-the-improvement-of-knee-extension-angle-in-unicompartmental-knee-arthroplasty
#3
Koji Takayama, Kazunari Ishida, Hirotsugu Muratsu, Yuichi Kuroda, Masanori Tsubosaka, Shingo Hashimoto, Shinya Hayashi, Takehiko Matsushita, Takahiro Niikura, Ryosuke Kuroda, Tomoyuki Matsumoto
PURPOSE: The purpose of this study was to examine the relationship between medial tibial joint line elevation and the improvement of range of motion (ROM) in unicompartmental knee arthroplasty (UKA). The hypothesis was that limited elevation of tibial joint line will improve knee range of motion in UKA. METHODS: Forty-six consecutive medial UKAs were enrolled in this study. Medial tibial joint line elevation was defined as the polyethylene insert and tibial tray thickness minus the tibial osteotomy and sawblade thickness...
November 9, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29121696/quadriceps-and-hamstring-muscle-strength-improves-after-unicompartmental-knee-arthroplasty
#4
Jennifer Kurowicki, Anton Khlopas, Nipun Sodhi, Jared M Newman, Assem A Sultan, Morad Chughtai, Anil Bhave, Martin Roche, Peter M Bonutti, Michael A Mont
INTRODUCTION: The ability to reach functional capacity following knee arthroplasty depends on the strength of the quadriceps and hamstring muscles. Following total knee arthroplasty, weakness of these muscles can persist for up to one year postoperatively; however, this phenomenon is not well-studied in unicompartmental knee arthroplasty (UKA) patients. Therefore, we assessed: 1) quadriceps muscle strength; 2) hamstring muscle strength; and 3) correlation to functional outcomes. MATERIALS AND METHODS: A review of all patients with medial compartment osteoarthritis treated with UKA at a minimum of one-year follow-up was performed...
November 9, 2017: Surgical Technology International
https://www.readbyqxmd.com/read/29114630/unicompartmental-knee-arthroplasty-modes-of-failure-and-conversion-to-total-knee-arthroplasty
#5
REVIEW
Michele Vasso, Katia Corona, Rocco D'Apolito, Giuseppe Mazzitelli, Alfredo Schiavone Panni
Despite the excellent success rates of the modern unicompartmental knee arthroplasty (UKA), results of knee replacement registries still shows a relatively high revision and failure rate for UKA, especially when compared with traditional total knee arthroplasty (TKA). Bearing dislocation continues to be advocated as the predominant mechanism of failure in mobile UKA, whereas polyethylene wear and aseptic loosening remains the main cause of failure of fixed UKA. Degeneration of the unreplaced compartments has been reported in both mobile and fixed designs...
March 2017: Joints
https://www.readbyqxmd.com/read/29113757/eight-hundred-twenty-five-medial-mobile-bearing-unicompartmental-knee-arthroplaties-the-first-10-year-us%C3%A2-multi-center-survival-analysis
#6
Omar K Alnachoukati, John W Barrington, Keith R Berend, Michael C Kolczun, Roger H Emerson, Adolph V Lombardi, David R Mauerhan
BACKGROUND: FDA approval for the Oxford phase III device was approved for use in the United States in 2004. This study seeks to provide the first long-term, large patient sample size, Oxford phase III multi-site survivorship study in the United States, investigating patient reported outcomes of pain and function, while also providing an in-depth analysis of causes for revision, and finally addressing recent advancements that can help aid the unicompartmental knee arthroplasty (UKA) process and further improve partial knee survivorship...
October 16, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29103779/is-outpatient-unicompartmental-knee-arthroplasty-safe-to-perform-at-an-ambulatory-surgery-center-a-comparative-study-of-early-post-operative-complications
#7
John P Cody, Kiel J Pfefferle, Deborah J Ammeen, Kevin B Fricka
BACKGROUND: Unicompartmental knee arthroplasty (UKA) lends itself to the outpatient surgical setting. Prior literature has established a low rate of readmission and post-operative complications when performed in a hospital outpatient setting (HOP). To our knowledge, there have been no studies comparing complications of UKA performed at an ambulatory surgery center (ASC) and those in a HOP. METHODS: We retrospectively reviewed all patients who underwent outpatient UKA by a single surgeon from 2012 to 2016...
October 10, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29103778/reduced-bearing-excursion-after-mobile-bearing-unicompartmental-knee-arthroplasty-is-associated-with-poor-functional-outcomes
#8
Naman Wahal, Sahil Gaba, Rajesh Malhotra, Vijay Kumar, Elise C Pegg, Hemant Pandit
BACKGROUND: A small proportion of patients with mobile unicompartmental knee arthroplasty (UKA) report poor functional outcomes in spite of optimal component alignment on postoperative radiographs. The purpose of this study is to assess whether there is a correlation between functional outcome and knee kinematics. METHODS: From a cohort of consecutive cases of 150 Oxford medial UKA, patients with fair/poor functional outcome at 1-year postsurgery (Oxford Knee Score [OKS] < 34, n = 15) were identified and matched for age, gender, preoperative clinical scores, and follow-up period with a cohort of patients with good/excellent outcome (OKS ≥ 34, n = 15)...
October 6, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29078996/ambulatory-unicompartmental-knee-arthroplasty-short-outcome-of-50-first-cases
#9
N Ruiz, X Buisson, G Filippi, M Roulet, H Robert
INTRODUCTION: The reduction in length of stay (LOS) in orthopaedic surgery has been steady for several years. For the past 3 or 4 years in France, the trend towards outpatient surgery has been growing up, as it is a goal for hospital administration. MATERIALS AND METHODS: This is a prospective, continuous,mono-centric, single operator study on 56 UKAs. Included were all UKAs carried out between January 2014 and December 2015, meeting the following criteria: voluntary patients, supportive family environment, absence of comorbidity (oral anticoagulants, diabetes, obesity), ASA score ≤ 3...
October 24, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/29074321/predicting-the-feasibility-of-correcting-mechanical-axis-in-large-varus-deformities-with-unicompartmental-knee-arthroplasty
#10
Laura J Kleeblad, Jelle P van der List, Andrew D Pearle, Austin T Fragomen, S Robert Rozbruch
BACKGROUND: Due to disappointing historical outcomes of unicompartmental knee arthroplasty (UKA), Kozinn and Scott proposed strict selection criteria, including preoperative varus alignment of ≤15°, to improve the outcomes of UKA. No studies to date, however, have assessed the feasibility of correcting large preoperative varus deformities with UKA surgery. The study goals were therefore to (1) assess to what extent patients with large varus deformities could be corrected and (2) determine radiographic parameters to predict sufficient correction...
October 5, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29067955/effects-of-lower-limb-alignment-and-tibial-component-inclination-on-the-biomechanics-of-lateral-compartment-in-unicompartmental-knee-arthroplasty
#11
Peng-Fei Wen, Wan-Shou Guo, Fu-Qiang Gao, Qi-Dong Zhang, Ju-An Yue, Li-Ming Cheng, Guang-Duo Zhu
BACKGROUND: Lateral compartmental osteoarthritis (LCOA), a major complication after medial mobile-bearing unicompartmental knee arthroplasty (UKA), is highly associated with the increased stress of the lateral compartment. This study aimed to analyze the effects on the stress and load distribution of the lateral compartment induced by lower limb alignment and coronal inclination of the tibial component in UKA through a finite element analysis. METHODS: Eight three-dimensional models were constructed based on a validated model for analyzing the biomechanical effects of implantation parameters on the lateral compartment after medial Oxford UKA: postoperative lower limb alignment of 3° valgus, neutral and 3° varus, and the inclination of tibial components placed in 4°, 2° valgus, square, and 2° and 4° varus...
November 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/29033153/clinical-outcomes-and-survivorship-of-lateral-unicompartmental-knee-arthroplasty-does-surgical-approach-matter
#12
Tori A Edmiston, Gregory C Manista, P Maxwell Courtney, Scott M Sporer, Craig J Della Valle, Brett R Levine
BACKGROUND: Lateral unicompartmental knee arthroplasty (UKA) has been shown to be an effective procedure to treat isolated lateral compartment osteoarthritis with excellent long-term survivorship. Whether a medial parapatellar approach or a lateral parapatellar approach is superior in lateral UKA is unknown. The purpose of this study was to determine if there is a difference in intermediate-term clinical outcomes in patients undergoing lateral UKA through a lateral vs medial parapatellar approach...
September 21, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28993855/postoperative-fixed-flexion-deformity-greater-than-10%C3%A2-lead-to-poorer-functional-outcome-10%C3%A2-years-after-unicompartmental-knee-arthroplasty
#13
Jared Ze Yang Yeh, Jerry Yongqiang Chen, Joel Wei-An Lim, Hee Nee Pang, Darren Keng Jin Tay, Shi-Lu Chia, Ngai Nung Lo, Seng Jin Yeo
PURPOSE: The primary aim of this study was to evaluate the influence of postoperative fixed flexion deformity (FFD) on the clinical outcomes 10 years after unicompartmental knee arthroplasty (UKA). The secondary aim was to identify predictors for the occurrence of postoperative FFD. METHODS: Patients who underwent UKA between 2003 and 2007 were prospectively followed up for 10 years. A total of 172 patients were categorized into 3 groups based on the amount of postoperative FFD: (1) 0° or less (Min-FFD), (2) 1°-9° (Mid-FFD), and (3) 10° or more (Max-FFD)...
October 9, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28993076/unicompartmental-knee-arthroplasty-achieves-greater-flexion-with-no-difference-in-functional-outcome-quality-of-life-and-satisfaction-vs-total-knee-arthroplasty-in-patients-younger-than-55-years-a-propensity-score-matched-cohort-analysis
#14
Graham Seow-Hng Goh, Hamid Rahmatullah Bin Abd Razak, Darren Keng-Jin Tay, Shi-Lu Chia, Ngai-Nung Lo, Seng-Jin Yeo
BACKGROUND: Improvements in surgical techniques, implant design, and adherence to indications have resulted in favorable outcomes after unicompartmental knee arthroplasty (UKA), particularly in an older population. However, no studies have compared the performance of contemporary UKA and total knee arthroplasty (TKA) in a young population. METHODS: Prospectively collected registry data of 160 UKAs performed in 160 patients younger than 55 years were reviewed. Propensity scores generated using logistic regression were used to adjust for confounding variables of age, gender, body mass index, preoperative range of motion, Knee Society Score, Oxford Knee Score, and Short-Form 36, allowing matching of the TKA cohort to the UKA cohort in a 1:1 ratio using the nearest-neighbor method...
September 19, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28983215/mid-term-outcomes-of-metal-backed-unicompartmental-knee-arthroplasty-show-superiority-to-all-polyethylene-unicompartmental-and-total-knee-arthroplasty
#15
Jelle P van der List, Laura J Kleeblad, Hendrik A Zuiderbaan, Andrew D Pearle
BACKGROUND: Two commonly used tibial designs for unicompartmental knee arthroplasty (UKA) are all-polyethylene "inlay" and metal-backed "onlay" components. Biomechanical studies showed that the metal baseplate in onlay designs better distributes forces over the tibia but studies failed to show differences in functional outcomes between both designs at mid-term follow-up. Furthermore, no studies have compared both designs with total knee arthroplasty (TKA). QUESTIONS/PURPOSES: The goal of this study was to compare outcomes of inlay UKA and onlay UKA at mid-term follow-up and compare these with TKA outcomes...
October 2017: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
https://www.readbyqxmd.com/read/28963154/revision-total-knee-arthroplasty-for-failed-high-tibial-osteotomy-and-unicompartmental-knee-arthroplasty-have-similar-patient-reported-outcome-measures-in-a-two-year-follow-up-study
#16
J B T Lim, H C Chong, H N Pang, K J D Tay, S L Chia, N N Lo, S J Yeo
AIMS: Little is known about the relative outcomes of revision of unicompartmental knee arthroplasty (UKA) and high tibial osteotomy (HTO) to total knee arthroplasty (TKA). The aim of this study is to compare the outcomes of revision surgery for the two procedures in terms of complications, re-revision and patient-reported outcome measures (PROMs) at a minimum of two years follow-up. PATIENTS AND METHODS: This study was a retrospective review of data from an institutional arthroplasty registry for cases performed between 2001 and 2014...
October 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28949036/subthalamic-nucleus-and-globus-pallidus-interna-influence-firing-of-tonically-active-neurons-in-the-primate-striatum-through-different-mechanisms
#17
Asuka Nakajima, Yasushi Shimo, Takanori Uka, Nobutaka Hattori
Both the subthalamic nucleus (STN) and the globus pallidus pars interna (GPi) are major targets for neuromodulation therapy for movement disorders. An example of such a therapy is deep brain stimulation (DBS). The striatum is the primary target for pharmacological treatment of these disorders. To further our understanding of both the functional relationships among motor nuclei and the mechanisms of therapies for movement disorders, it is important to clarify how changing the neuronal activity of one target, either by medication or by artificial electrical stimulation, affects the other connected nuclei...
September 26, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28946833/the-180%C3%A2-spin-of-meniscal-bearing-in-unicompartmental-knee-arthroplasty
#18
Su Chan Lee, Seung Hyun Hwang, Chang Hyun Nam, Seung Ryol Ryu, Hye Sun Ahn
Mobile-bearing Oxford medial unicompartmental knee arthroplasty (UKA) has been widely used and has produced good results in the treatment of medial compartmental osteoarthritis. But it is associated with the potential risk of meniscal bearing dislocation. Symptoms caused by most meniscal bearing dislocations include acute pain, knee swelling, and locking. We report two unusual cases of meniscal bearing spinning of 180° without remarkable symptoms, which would have been easily missed if we had not watched carefully...
September 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28936684/kinematics-of-mobile-bearing-unicompartmental-knee-arthroplasty-compared-to-native-results-from-an-in-vitro-study
#19
Geert Peersman, Josh Slane, Philippe Vuylsteke, Susanne Fuchs-Winkelmann, Philipp Dworschak, Thomas Heyse, Lennart Scheys
INTRODUCTION: Fixed-bearing unicompartmental knee arthroplasty (UKA) closely replicates native knee kinematics. As few studies have assessed kinematics following mobile-bearing (MB) UKA, the current study aimed to investigate whether MB UKA preserves natural knee kinematics. MATERIALS AND METHODS: Seven fresh-frozen full-leg cadaver specimens were prepared and mounted in a kinematic rig that allowed all degrees of freedom at the knee. Three motion patterns, passive flexion-extension (0°-110° flexion), open-chain extension (5°-70° flexion) and squatting (30°-100° flexion), were performed pre- and post-implantation of a medial MB UKA and compared in terms of rotational and translational knee joint kinematics in the different anatomical planes, respectively...
September 21, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28915887/professional-fulfillment-and-parenting-work-life-balance-in-female-physicians-in-basic-sciences-and-medical-research-a-nationwide-cross-sectional-survey-of-all-80-medical-schools-in-japan
#20
Yuka Yamazaki, Takanori Uka, Eiji Marui
BACKGROUND: In Japan, the field of Basic Sciences encompasses clinical, academic, and translational research, as well as the teaching of medical sciences, with both an MD and PhD typically required. In this study, it was hypothesized that the characteristics of a Basic Sciences career path could offer the professional advancement and personal fulfillment that many female medical doctors would find advantageous. Moreover, encouraging interest in Basic Sciences could help stem shortages that Japan is experiencing in medical fields, as noted in the three principal contributing factors: premature resignation of female clinicians, an imbalance of female physicians engaged in research, and a shortage of medical doctors in the Basic Sciences...
September 15, 2017: Human Resources for Health
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