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Unicompartmental knee arthroplasty

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https://www.readbyqxmd.com/read/28077394/metal-backed-versus-all-polyethylene-unicompartmental-knee-arthroplasty-proximal-tibial-strain-in-an-experimentally-validated-finite-element-model
#1
C E H Scott, M J Eaton, R W Nutton, F A Wade, S L Evans, P Pankaj
OBJECTIVES: Up to 40% of unicompartmental knee arthroplasty (UKA) revisions are performed for unexplained pain which may be caused by elevated proximal tibial bone strain. This study investigates the effect of tibial component metal backing and polyethylene thickness on bone strain in a cemented fixed-bearing medial UKA using a finite element model (FEM) validated experimentally by digital image correlation (DIC) and acoustic emission (AE). MATERIALS AND METHODS: A total of ten composite tibias implanted with all-polyethylene (AP) and metal-backed (MB) tibial components were loaded to 2500 N...
January 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28067099/dynamic-rsa-for-the-evaluation-of-inducible-micromotion-of-oxford-uka-during-step-up-and-step-down-motion
#2
Kristian Horsager, Bart L Kaptein, Lone RøMer, Peter B Jørgensen, Maiken Stilling
Background and purpose - Implant inducible micromotions have been suggested to reflect the quality of the fixation interface. We investigated the usability of dynamic RSA for evaluation of inducible micromotions of the Oxford Unicompartmental Knee Arthroplasty (UKA) tibial component, and evaluated factors that have been suggested to compromise the fixation, such as fixation method, component alignment, and radiolucent lines (RLLs). Patients and methods - 15 patients (12 men) with a mean age of 69 (55-86) years, with an Oxford UKA (7 cemented), were studied after a mean time in situ of 4...
January 9, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28060788/outpatient-total-hip-arthroplasty-total-knee-arthroplasty-and-unicompartmental-knee-arthroplasty-a-systematic-review-of-the-literature
#3
Michael Pollock, Lyndsay Somerville, Andrew Firth, Brent Lanting
BACKGROUND: The demand for total hip arthroplasty (THA), total knee arthroplasty (TKA), and unicompartmental knee arthroplasty (UKA) is growing rapidly because of the proven success of these procedures and an increase in the aging population. However, resources are limited and health-care budgets are finite. Recently, a number of care providers have started performing these procedures on an outpatient basis, with the patients being discharged from the hospital on the day of surgery. The primary objective of this systematic review was to examine the evidence regarding the safety and feasibility of performing THA, TKA, or UKA on an outpatient basis...
December 27, 2016: JBJS Reviews
https://www.readbyqxmd.com/read/28056570/different-incidences-of-knee-arthroplasty-in-the-nordic-countries
#4
Mika J NiemeläInen, Keijo T MäKelä, Otto Robertsson, Annette W-Dahl, Ove Furnes, Anne M Fenstad, Alma B Pedersen, Henrik M Schrøder, Heini Huhtala, Antti Eskelinen
Background and purpose - The annual number of total knee arthroplasties (TKAs) has increased worldwide in recent years. To make projections regarding future needs for primaries and revisions, additional knowledge is important. We analyzed and compared the incidences among 4 Nordic countries Patients and methods - Using Nordic Arthroplasty Register Association (NARA) data from 4 countries, we analyzed differences between age and sex groups. We included patients over 30 years of age who were operated with TKA or unicompartmental knee arthroplasty (UKA) during the period 1997-2012...
January 6, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28053251/bias-and-unicompartmental-knee-arthroplasty
#5
D W Murray, A D Liddle, A Judge, H Pandit
We recently published a paper comparing the incidence of adverse outcomes after unicompartmental and total knee arthroplasty (UKA and TKA). The conclusion of this study, which was in favour of UKA, was dismissed as "biased" in a review in Bone & Joint 360 Although this study is one of the least biased comparisons of UKA and TKA, this episode highlights the biases that exist both for and against UKA. In this review, we explore the different types of bias, particularly selection, reporting and measurement. We conclude that comparisons between UKA and TKA are open to bias...
January 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28042121/conversion-of-a-unicompartmental-knee-arthroplasty-to-a-total-knee-arthroplasty-can-we-achieve-a-primary-result
#6
E Thienpont
OBJECTIVES: Unicompartmental knee arthroplasty (UKA) is a potential treatment for isolated bone on bone osteoarthritis when limited to a single compartment. The risk for revision of UKA is three times higher than for total knee arthroplasty (TKA). The aim of this review was to discuss the different revision options after UKA failure. MATERIALS AND METHODS: A search was performed for English language articles published between 2006 and 2016. After reviewing titles and abstracts, 105 papers were selected for further analysis...
January 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28039023/determination-of-the-accuracy-of-navigated-kinematic-unicompartmental-knee-arthroplasty-a-2-year-follow-up
#7
Andrea L Grant, Kenji D Doma, Kaushik Hazratwala
BACKGROUND: Unicompartmental knee arthroplasty (UKA) lacks history of patient satisfaction and research addressing technique validity. The aim of this study was to determine minimally invasive navigated kinematic UKA accuracy by comparing postoperative limb alignment with preoperative stress values. METHODS: A single-center retrospective study was conducted on 53 consecutive patients (postoperative alignment: varus n = 51, valgus n = 2) who underwent computer navigation assisted UKA...
November 29, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28032123/ten-year-patient-reported-outcomes-following-total-and-minimally-invasive-unicompartmental-knee-arthroplasty-a-propensity-score-matched-cohort-analysis
#8
Edward Burn, Maria T Sanchez-Santos, Hemant G Pandit, Thomas W Hamilton, Alexander D Liddle, David W Murray, Rafael Pinedo-Villanueva
PURPOSE: For patients with medial compartment arthritis who have failed non-operative treatment, either a total knee arthroplasty (TKA) or a unicompartmental knee arthroplasty (UKA) can be undertaken. This analysis considers how the choice between UKA and TKA affects long-term patient-reported outcome measures (PROMs). METHODS: The Knee Arthroplasty Trial (KAT) and a cohort of patients who received a minimally invasive UKA provided data. Propensity score matching was used to identify comparable patients...
December 29, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28005115/robotic-technology-produces-more-conservative-tibial-resection-than-conventional-techniques-in-uka
#9
Danielle Y Ponzio, Jess H Lonner
Conversion of unicompartmental knee arthroplasty (UKA) to total knee arthroplasty (TKA) may be relatively simple when tibial resection is conservative during the index UKA. However, with greater tibial resection, conversion to TKA may be complicated by osseous insufficiency, requiring stems and augments, and potentially compromising patient outcomes and TKA durability. Robotic assistance in UKA is shown to enhance the bone preparation accuracy. In our retrospective comparison of polyethylene insert sizes, 8-mm or 9-mm polyethylene inserts were used in 93...
November 2016: American Journal of Orthopedics
https://www.readbyqxmd.com/read/28005097/why-do-lateral-unicompartmental-knee-arthroplasties-fail-today
#10
Jelle P van der List, Hendrik A Zuiderbaan, Andrew D Pearle
In large studies, the failure modes of lateral unicompartmental knee arthroplasty (UKA) are usually presented in combination with medial UKA, which is mainly due to low surgical frequency of lateral UKA. Because lateral UKA differs from medial UKA in anatomic and kinematic characteristics, failure modes of lateral UKA should not be presented in combination with medial UKA. Therefore, we performed a systematic review to assess failure modes in lateral UKA and compared failure modes in cohort studies with those found in registry-based studies...
November 2016: American Journal of Orthopedics
https://www.readbyqxmd.com/read/28002437/non-sagittal-knee-joint-kinematics-and-kinetics-during-gait-on-level-and-sloped-grounds-with-unicompartmental-and-total-knee-arthroplasty-patients
#11
Igor Komnik, Markus Peters, Johannes Funken, Sina David, Stefan Weiss, Wolfgang Potthast
After knee arthroplasty (KA) surgery, patients experience abnormal kinematics and kinetics during numerous activities of daily living. Biomechanical investigations have focused primarily on level walking, whereas walking on sloped surfaces, which is stated to affect knee kinematics and kinetics considerably, has been neglected to this day. This study aimed to analyze over-ground walking on level and sloped surfaces with a special focus on transverse and frontal plane knee kinematics and kinetics in patients with KA...
2016: PloS One
https://www.readbyqxmd.com/read/27990190/spontaneous-osteonecrosis-of-the-knee-a-retrospective-analysis-by-using-mri-and-dexa
#12
Akira Horikawa, Naohisa Miyakoshi, Yoichi Shimada, Hiroyuki Kodama
OBJECTIVE: Although there are many etiology and prediction for prognosis of spontaneous osteonecrosis of the knee (SONK) by using radiological examinations, these issue have not been clarified yet. Furthermore, most of the studies evaluated them by only radiological examination such as magnetic resonance imaging (MRI), bone mineral density (BMD) in dual-energy X-ray abosorptiometry (DEXA) or plain X-ray. Therefore, we focused our investigation on the measurements of the affected área in MRI and BMD in DEXA, and whether these results were conected with the cause and prognosis of SONK or not...
2016: Open Orthopaedics Journal
https://www.readbyqxmd.com/read/27979407/differences-in-patient-reported-outcomes-between-unicompartmental-and-total-knee-arthroplasties-a-propensity-score-matched-analysis
#13
Man S Kim, In J Koh, Young J Choi, Jong Y Lee, Yong In
BACKGROUND: The purpose of this study was to compare the patient-reported outcomes regarding joint awareness, function, and satisfaction after unicompartmental knee arthroplasty (UKA) and total knee arthroplasty (TKA). METHODS: We identified all patients who underwent a UKA or TKA at our institution between September 2011 and March 2014, with a minimum follow-up of 2 years. Propensity score matching was performed for age, gender, body mass index, operation side, and the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score...
November 27, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27957592/-lateral-unicompartmental-knee-arthroplasty-a-challenge
#14
T Walker, P R Aldinger, M R Streit, T Gotterbarm
OBJECTIVE: Joint surface replacement in the lateral compartment by unicondylar knee arthroplasty. INDICATIONS: Lateral unicompartmental osteoarthritis of the knee joint, avascular necrosis of the lateral femoral condyle. CONTRAINDICATIONS: Full thickness cartilage defect in the central part of the medial compartment or in the medial aspect of the patellofemoral joint. Instability/contracture of cruciate and collateral ligaments, valgus deformity >15°, valgus deformity not passively correctable, flexion deformity >15°, an intraoperative flexion <100°, failed upper tibial osteotomy, rheumatoid arthritis...
December 12, 2016: Operative Orthopädie und Traumatologie
https://www.readbyqxmd.com/read/27923627/outcomes-of-cementless-unicompartmental-and-total-knee-arthroplasty-a-systematic-review
#15
REVIEW
Jelle P van der List, Dana L Sheng, Laura J Kleeblad, Harshvardhan Chawla, Andrew D Pearle
BACKGROUND: Aseptic loosening is a common failure mode in cemented unicompartmental knee arthroplasty (UKA) and total knee arthroplasty (TKA). This led to the development of cementless designs but the historical outcomes were poor. Recent developments in cementless designs have improved outcomes, but the current status is unknown. Therefore, a systematic review was performed to assess recent outcomes of cementless knee arthroplasty. METHODS: A search was performed using PubMed, Embase and Cochrane systems and national registries for studies reporting outcomes since 2005...
December 3, 2016: Knee
https://www.readbyqxmd.com/read/27923169/primary-stability-of-unicompartmental-knee-arthroplasty-under-dynamic-flexion-movement-in-human-femora
#16
Thomas M Grupp, Melanie Holderied, Matthias F Pietschmann, Christian Schröder, Angélica P Islas Padilla, Christoph Schilling, Volkmar Jansson, Peter E Müller
BACKGROUND: The objective of our study was to evaluate the impact of a trabecular stem fixation versus a cortical teeth fixation technique on the primary stability of cemented unicompartmental femoral components under dynamic flexion movement loading conditions in human femora. METHODS: Ten fresh-frozen human knees of a mean donor age of 73.9years were used to perform medial unicompartmental knee arthroplasty under a less invasive parapatellar surgical approach...
November 26, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/27916580/annual-revision-rates-of-partial-versus-total-knee-arthroplasty-a-comparative-meta-analysis
#17
REVIEW
Harshvardhan Chawla, Jelle P van der List, Alexander B Christ, Maximiliano R Sobrero, Hendrik A Zuiderbaan, Andrew D Pearle
BACKGROUND: Utilization of unicompartmental knee arthroplasty (UKA) and patellofemoral arthroplasty (PFA) as alternatives to total knee arthroplasty (TKA) for unicompartmental knee osteoarthritis (OA) has increased. However, no single resource consolidates survivorship data between TKA and partial resurfacing options for each variant of unicompartmental OA. This meta-analysis compared survivorship between TKA and medial UKA (MUKA), lateral UKA (LUKA) and PFA using annual revision rate as a standardized metric...
December 1, 2016: Knee
https://www.readbyqxmd.com/read/27909123/comparative-study-of-computer-assisted-total-knee-arthroplasty-after-opening-wedge-osteotomy-versus-after-unicompartmental-arthroplasty
#18
R Pailhé, J Cognault, J Massfelder, A Sharma, R-C Rouchy, B Rubens-Duval, D Saragaglia
AIMS: The role of high tibial osteotomy (HTO) is being questioned by the use of unicompartmental knee arthroplasty (UKA) in the treatment of medial compartment femorotibial osteoarthritis. Our aim was to compare the outcomes of revision HTO or UKA to a total knee arthroplasty (TKA) using computer-assisted surgery in matched groups of patients. PATIENTS AND METHODS: We conducted a retrospective study to compare the clinical and radiological outcome of patients who underwent revision of a HTO to a TKA (group 1) with those who underwent revision of a medial UKA to a TKA (group 2)...
December 2016: Bone & Joint Journal
https://www.readbyqxmd.com/read/27904720/clinical-results-of-lateral-unicompartmental-knee-arthroplasty-minimum-2-year-follow-up
#19
Kyung Tae Kim, Song Lee, Jeehyoung Kim, Jin Woo Kim, Min Su Kang
BACKGROUND: We investigated the clinical results and early complications after lateral unicompartmental knee arthroplasty (UKA) using the Zimmer unicompartmental high-flex knee (ZUK) prosthesis with a minimum follow-up of 2 years. METHODS: Twenty-seven patients (30 cases) who underwent lateral UKA with the ZUK prosthesis between January 2011 and February 2014 were selected for this study. The mean age of the patients was 63.3 years at the time of surgery, and the mean followup was 3 years and 2 months (range, 24 to 48 months)...
December 2016: Clinics in Orthopedic Surgery
https://www.readbyqxmd.com/read/27900474/bone-scan-usefulness-in-patients-with-painful-hip-or-knee-prosthesis-10-situations-that-can-cause-pain-other-than-loosening-and-infection
#20
REVIEW
Sofia Vaz, Teresa C Ferreira, Lucília Salgado, Frédéric Paycha
In recent years, with the higher median life expectancy, the number of hip and knee replacements has increased. Clinical examination and morphological studies are essential to evaluate patients with a painful arthroplasty. Nuclear medicine examinations also play an important role, their main usefulness being the exclusion of prosthesis complications. Nevertheless, conventional examinations, namely bone scan and white blood cell scintigraphy, can also identify complications, such as loosening and infection. This study describes the normal and pathologic patterns of a bone scan and exemplifies ten common situations that can cause pain in patients with hip or knee arthroplasty, other than loosening and infection, which can be disclosed on a bone scintigraphy...
November 30, 2016: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
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