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Unicompartmental knee arthroplasty

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https://www.readbyqxmd.com/read/29776853/outcomes-of-a-fixed-bearing-medial-cemented-unicondylar-knee-arthroplasty-design-survival-analysis-and-functional-score-of-460-cases
#1
Philip Winnock de Grave, Justine Barbier, Thomas Luyckx, Alexander Ryckaert, Paul Gunst, Luc Van den Daelen
BACKGROUND: Unicompartmental knee arthroplasty (UKA) is an alternative to total knee arthroplasty in isolated medial osteoarthritis (OA). However, despite satisfactory reports on the clinical performance, UKA revision rates are still concerning. This retrospective study reports on the long-term survivorship, functional outcomes, and reasons for revision in fixed-bearing UKA implant. METHODS: Between 2005 and 2013, 460 consecutive patients were treated with medial UKA in one center using a fixed-bearing UKA system...
April 24, 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29776813/unicompartmental-knee-arthroplasty-for-spontaneous-osteonecrosis-of-the-medial-tibial-plateau
#2
Tomoyuki Kamenaga, Takafumi Hiranaka, Yuichi Hida, Takaaki Fujishiro, Koji Okamoto
BACKGROUND: There have been very few reports on isolated medial tibial plateau osteonecrosis, and the condition has not been clearly described. Unicompartmental knee arthroplasty (UKA) may be an appropriate treatment method for this condition. The aims of this study were to report our experience of using mobile-bearing knee implants for osteonecrosis of the medial tibial plateau and to discuss the etiology and treatment of this type of osteonecrosis. METHODS: This study included six consecutive patients with isolated medial tibial plateau osteonecrosis treated with an Oxford mobile-bearing knee implant...
May 16, 2018: Knee
https://www.readbyqxmd.com/read/29753264/perineural-dexamethasone-successfully-prolongs-adductor-canal-block-when-assessed-by-objective-pinprick-sensory-testing-a-prospective-randomized-dose-dependent-placebo-controlled-equivalency-trial
#3
James D Turner, Daryl S Henshaw, Robert S Weller, J Douglas Jaffe, Christopher J Edwards, J Wells Reynolds, Gregory B Russell, Sean W Dobson
STUDY OBJECTIVE: To determine whether perineural dexamethasone prolongs peripheral nerve blockade (PNB) when measured objectively; and to determine if a 1 mg and 4 mg dose provide equivalent PNB prolongation compared to PNB without dexamethasone. SETTING: Multiple studies have reported that perineural dexamethasone added to local anesthetics (LA) can prolong PNB. However, these studies have relied on subjective end-points to quantify PNB duration. The optimal dose remains unknown...
May 8, 2018: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/29748141/short-term-functional-advantages-after-medial-unicompartmental-versus-total-knee-arthroplasty
#4
Bernd Friesenbichler, Julia F Item-Glatthorn, Vanessa Wellauer, Fabian von Knoch, Nicola C Casartelli, Nicola A Maffiuletti
BACKGROUND: There are many uncertainties about the advantages and disadvantages of using unicompartmental (UKA) versus total knee arthroplasty (TKA) to treat patients with knee osteoarthritis. It is important to have sufficient early postoperative quadriceps strength for long-term, self-reported and gait-related outcomes after knee arthroplasty, but very limited comparative data exist regarding UKA and TKA patients. METHODS: This study assessed isometric quadriceps strength, spatio-temporal gait parameters (walking speed, step length, single-limb support phase) and self-reported outcomes (pain, function, stiffness) in 18 TKA and 18 UKA patients six months after surgery, as well as in 18 healthy controls...
May 7, 2018: Knee
https://www.readbyqxmd.com/read/29731320/the-largest-survivorship-and-clinical-outcomes-study-of-the-fixed-bearing-stryker-triathlon-partial-knee-replacement-a-multi-surgeon-single-centre-cohort-study-with-a-minimum-of-two-years-of-follow-up
#5
S W F Middleton, P J Schranz, V I Mandalia, A D Toms
BACKGROUND: The surgical management of isolated medial compartment degenerative disease of the knee causes debate. Unicompartmental arthroplasty options include fixed and mobile bearing implant designs with fixed bearing becoming increasingly popular. We present the largest cohort of a fixed bearing single radius design, Stryker Triathlon Partial Knee Replacement (PKR). METHODS: We prospectively collected demographic data and patient reported outcome measures (PROMs) on our cohort of PKR implants since its adoption in our unit, 2009 until March 2015...
May 3, 2018: Knee
https://www.readbyqxmd.com/read/29729936/single-stage-bilateral-medial-oxford-unicompartmental-knee-arthroplasty-a-case-control-study-of-perioperative-blood-loss-complications-and-functional-results
#6
Arnaud Clavé, Emeline Gauthier, Navraj S Nagra, François Fazilleau, A Anthony Le Sant, Frédéric Dubrana
BACKGROUND: The benefits and risks of a single-stage medial UKA remains a subject of debate because of the theoretically higher risk of complications and specifically blood loss. The aim of this study was to evaluate the perioperative blood loss, risks and the functional results of single-stage bilateral medial Oxford Unicompartmental Knee Arthroplasty (OUKA) compared to a standard unilateral medial OUKA procedure (control group). HYPOTHESIS: the blood loss observed during bilateral single-stage medial Oxford UKA is not different from that of the control group...
May 3, 2018: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/29728833/ftfa-change-under-valgus-stress-force-radiography-is-useful-for-evaluating-the-correctability-of-intra-articular-varus-deformity-in-uka
#7
Qidong Zhang, Juan Yue, Weiguo Wang, Yan Chen, Qichao Zhao, Wanshou Guo
OBJECTIVE: The aim of this observational study was to investigate the postoperative alignment change with Oxford unicompartmental knee arthroplasties (UKA), and clarify whether femoro-tibial facet angle (FTFA) is useful for evaluating alignment correctability with UKA. METHODS: This study evaluated 79 knees consecutive minimally invasive Oxford phase 3 UKAs performed between 2013 and 2014. Full-length weight-bearing radiographs of the lower limbs were obtained pre- and postoperatively to assess varus angle...
May 4, 2018: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29721464/unicompartmental-knee-replacement-in-patients-aged-70-years-and-older
#8
Alberto Ventura, Claudio Legnani, Enrico Borgo
Introduction: The management of isolated unicompartmental osteoarthritis in the patient aged 70 years and older is an issue of debate. The purpose of the present study was to retrospectively evaluate the outcomes of patients aged over 70 years who underwent unicompartmental knee replacement (UKR) for the treatment of isolated unicompartmental osteoarthritis. The hypothesis was that this represents a safe and viable procedure leading to improved functional outcome in elderly patients affected by isolated unicompartmental osteoarthritis...
October 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/29713783/a-high-rate-of-tibial-plateau-fractures-after-early-experience-with-patient-specific-instrumentation-for-unicompartmental-knee-arthroplasties
#9
A M Leenders, M G M Schotanus, R J P Wind, R A P Borghans, N P Kort
PURPOSE: Patient-specific instrumentation (PSI) for unicompartmental knee arthroplasty (UKA) has been available for a few years. However, limited literature is available on this subject. Hence, the aim of this cohort study is to evaluate the 2 years' results of our first experiences with the use of PSI in UKA. It is hypothesised that there is no advantage in rate of adverse events and in radiological and functional outcomes in comparison to literature on the conventional method. METHODS: This cohort included 129 knees of 122 patients, operated by one surgeon...
April 30, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29709523/knee-arthroplasty-patients-predicted-versus-actual-recovery-what-are-their-expectations-about-time-of-recovery-following-surgery-and-how-long-before-they-can-do-the-tasks-they-want-to-do
#10
Karen L Barker, Erin Hannink, Sam Pemberton, Cathy Jenkins
OBJECTIVE: (1) To determine evidence-based guidance for the length of time to return to specific valued functional and leisure activities following knee arthroplasty (KA). (2) To determine what patients feel are the most important functional or leisure activities to recover after KA. (3) To collect information about patients' expectations and compare them to the actual time it takes to return. DESIGN: Prospective longitudinal cohort observational survey SETTING: Specialist orthopaedic hospital PARTICIPANTS: 99 patients with osteoarthritis or rheumatoid arthritis (mean= 69...
April 27, 2018: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29705680/medial-mobile-bearing-unicompartmental-knee-arthroplasty-in-young-patients-aged-less-than-or-equal-to-50-years
#11
Nicholas J Greco, Adolph V Lombardi, Andrew J Price, Michael E Berend, Keith R Berend
BACKGROUND: Contemporary research has shown medial mobile-bearing unicompartmental knee arthroplasty to be an effective treatment in patients younger than 60 years; however, only one other study has specifically investigated unicompartmental arthroplasty outcomes in patients 50 years or younger. The purpose of this study was to determine the clinical outcomes and survivorship of medial mobile-bearing unicompartmental arthroplasty in this younger patient population. METHODS: A retrospective review of patients undergoing primary unicompartmental knee arthroplasty using the Oxford partial knee from 2003 to 2014 in a single practice database was performed...
April 9, 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29691172/revision-of-unicompartmental-knee-arthroplasty-to-total-knee-arthroplasty-is-it-as-good-as-a-primary-result
#12
Adolph V Lombardi, Mark T Kolich, Keith R Berend, Michael J Morris, David A Crawford, Joanne B Adams
BACKGROUND: Unicompartmental knee arthroplasty (UKA) is touted as a more conservative, bone- and tissue-sparing procedure than total knee arthroplasty (TKA). Similarly, revision of UKA to TKA is generally a simpler procedure than revision of TKA to TKA and can be accomplished with primary TKA components in most cases. The purpose of this study was to review a consecutive series of patients undergoing revision of failed UKA to TKA to determine if etiology is similar to that reported in recent literature and evaluate if the results align more with primary TKA vs revision of TKA to TKA...
March 17, 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29685501/effect-of-femoral-component-position-on-biomechanical-outcomes-of-unicompartmental-knee-arthroplasty
#13
Kyoung-Tak Kang, Juhyun Son, Yong-Gon Koh, Oh-Ryong Kwon, Sae Kwang Kwon, Yong Jun Lee, Kwan Kyu Park
BACKGROUND: The positions of unicompartmental femoral components do not always follow the neutral center of the medial distal femoral condyle. The biomechanical effect of the center of the distal femoral condyle has not yet been evaluated, and the optimal femoral position in unicompartmental knee arthroplasty (UKA) is yet to be biomechanically justified. The purpose of this study was to evaluate, using finite element analysis, the effect of the center of the distal femoral component on the biomechanical outcomes of UKA with respect to the contact stresses in the polyethylene (PE) insert and articular cartilage...
April 20, 2018: Knee
https://www.readbyqxmd.com/read/29685499/how-does-the-inclination-of-the-tibial-component-matter-a-three-dimensional-finite-element-analysis-of-medial-mobile-bearing-unicompartmental-arthroplasty
#14
Xuesong Dai, Jinghua Fang, Lifeng Jiang, Yan Xiong, Miaofeng Zhang, Sunan Zhu
BACKGROUND: Medial unicompartmental knee arthroplasty (UKA) using Oxford mobile-bearing prosthesis is performed in the treatment of medial compartmental arthritis of the knee. However, little is known about the stress distributions for mobile-bearing UKA on the medial tibial plateau. METHODS: In this study, the stresses on the coronal plane were calculated in a three-dimensional model of the proximal tibia. The features of the stress distribution were investigated when the tibial tray was placed in 15°, 10°, six degrees, and three degrees varus, neutral (0°), and in three degrees, six degrees, 10°, and 15° valgus on the coronal plane of the medial plateau...
April 20, 2018: Knee
https://www.readbyqxmd.com/read/29684539/fewer-complications-after-uka-than-tka-in-patients-over-85-years-of-age-a-case-control-study
#15
Quentin Ode, Romain Gaillard, Cécile Batailler, Yannick Herry, Philippe Neyret, Elvire Servien, Sébastien Lustig
INTRODUCTION: Implanting a knee prosthesis in patients aged over 85 years is not without risk. Unicompartmental knee arthroplasty (UKA) is reputed to show lower morbidity and mortality than total knee arthroplasty (TKA). Elderly patients with isolated unicompartmental osteoarthritis without specific contraindications are thus good candidates for this procedure. The present retrospective case-control study compared complications rates in elderly patients receiving UKA versus TKA. The study hypothesis was that UKA incurs fewer complications, with equivalent functional results...
April 20, 2018: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/29680583/pros-and-cons-a-balanced-view-of-robotics-in-knee-arthroplasty
#16
Jess H Lonner, Yale A Fillingham
In both unicompartmental knee arthroplasty (UKA) and total knee arthroplasty (TKA), compared with conventional techniques robotic technology has been shown to optimize the precision of bone preparation and component alignment, reducing outliers and increasing the percentage of components aligned within 2° or 3° of the target goal. In addition, soft tissue balance can be quantified through a range of motion in UKA and TKA using the various robotic technologies available. Although the presumption has been that the improved alignment associated with robotics will improve function and implant durability, there are limited data to support that notion...
March 30, 2018: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29665764/unicompartmental-knee-arthroplasty-for-spontaneous-osteonecrosis-of-the-knee-a-meta-analysis
#17
Julio J Jauregui, Christopher L Blum, Neil Sardesai, Craig Bennett, R Frank Henn, Farshad Adib
BACKGROUND: Spontaneous osteonecrosis of the knee (SONK) is a poorly understood but debilitating disease entity. Total knee arthroplasty (TKA) is the standard of care for those patients who fail conservative management, but considering SONK's predilection for affecting a single knee compartment, unicompartmental knee arthroplasty (UKA) appears to be a more tailored option. Unfortunately, conflicting data exist on the utility of UKA in SONK. Thus, the purpose of this study was to evaluate functional outcomes and revision rates of UKA in the setting of SONK...
May 2018: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/29663012/medial-joint-line-elevation-of-the-tibia-measured-during-surgery-has-a-significant-correlation-with-the-limb-alignment-changes-following-medial-unicompartmental-knee-arthroplasty
#18
Yuichi Kuroda, Koji Takayama, Kazunari Ishida, Shinya Hayashi, Shingo Hashimoto, Masanori Tsubosaka, Takehiko Matsushita, Takahiro Niikura, Kotaro Nishida, Ryosuke Kuroda, Tomoyuki Matsumoto
PURPOSE: This study aimed to determine the correlation between the change in joint line height calculated from the resected bone and insert thickness during surgery and the change in limb alignment following unicompartmental knee arthroplasty (UKA). It was hypothesized that joint line elevation is correlated with the change in limb alignment. METHODS: A total of 74 consecutive patients diagnosed with either isolated medial compartmental osteoarthritis (38 patients) or spontaneous osteonecrosis of the knee (36 patients) were included...
April 16, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29657839/current-concepts-for-aligning-knee-implants-patient-specific-or-systematic
#19
REVIEW
Charles Rivière, Stefan Lazic, Oliver Boughton, Yann Wiart, Loic Vïllet, Justin Cobb
Mechanical or anatomical alignment techniques create a supposedly 'biomechanically friendly' but often functionally limited prosthetic knee.Alternative techniques for alignment in total knee arthroplasty (TKA) aim at being more anatomical and patient-specific, aiming to improve functional outcomes after TKA.The kinematic alignment (KA) technique for TKA has shown good early clinical outcomes. Its role in extreme anatomical variation remains to be defined.The restricted KA technique for TKA might be a reasonable option for patients with extreme anatomical variation...
January 2018: EFORT Open Reviews
https://www.readbyqxmd.com/read/29649670/the-influence-of-the-twin-peg-design-on-femoral-interface-temperature-and-maximum-load-to-failure-in-cemented-oxford-unicompartmental-knee-arthroplasty
#20
Tobias Reiner, Martin Schwarze, Benjamin Panzram, Matthias C Klotz, Rudi G Bitsch, Sebastian Jaeger
BACKGROUND: The twin peg femoral component was introduced for the cemented Oxford unicondylar knee to increase implant stability. The aim of this experimental study was to investigate the influence of the twin peg design on femoral interface temperature and maximum load to failure in comparison to the single peg design. METHODS: In this experimental study medial Oxford unicompartmental knee arthroplasty was performed in 12 pairs of fresh-frozen human knees. A cemented femoral single peg component was implanted on the one side (group A) and a cemented twin peg component on the other side (group B)...
April 5, 2018: Clinical Biomechanics
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