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Unicondylar knee arthroplasty

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https://www.readbyqxmd.com/read/27869619/five-year-survival-of-20-946-unicondylar-knee-replacements-and-patient-risk-factors-for-failure-an-analysis-of-german-insurance-data
#1
Elke Jeschke, Thorsten Gehrke, Christian Günster, Joachim Hassenpflug, Jürgen Malzahn, Fritz Uwe Niethard, Peter Schräder, Josef Zacher, Andreas Halder
BACKGROUND: Improvements in implant design and surgical technique of unicondylar knee arthroplasty have led to reduced revision rates, but patient selection seems to be crucial for success of such arthroplasties. The purpose of the present study was to analyze the 5-year implant survival rate of unicondylar knee replacements in Germany and to identify patient factors associated with an increased risk of revision, including >30 comorbid conditions. METHODS: Using nationwide billing data of the largest German health-care insurance for inpatient hospital treatment, we identified patients who underwent unicondylar knee arthroplasty between 2006 and 2012...
October 19, 2016: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/27868008/robotic-unicondylar-knee-arthroplasty-a-commentary-on-a-recently-published-level-1-study
#2
COMMENT
Alexander H Jinnah, Ashley Multani, Riyaz H Jinnah, Johannes F Plate
No abstract text is available yet for this article.
October 2016: Annals of Translational Medicine
https://www.readbyqxmd.com/read/27760695/effect-of-lavage-and-brush-preparation-on-cement-penetration-and-primary-stability-in-tibial-unicompartmental-total-knee-arthroplasty-an-experimental-cadaver-study
#3
Christian Scheele, Matthias F Pietschmann, Christian Schröder, Thomas Grupp, Melanie Holderied, Volmar Jansson, Peter E Müller
BACKGROUND: Unicompartmental total knee arthroplasty (UKA) is a well-established treatment option for unicondylar osteoarthritis, and generally leads to better functional results than tricompartimental total knee arthroplasty (TKA). However, revision rates of UKAs are reported as being higher; a major reason for this is aseptic loosening of the tibial component due to implant-cement-bone interface fatigue. The objective of this study was to determine the effects of trabecular bone preparation, prior to implantation of tibial UKAs, on morphological and biomechanical outcomes in a cadaver study...
October 16, 2016: Knee
https://www.readbyqxmd.com/read/27704318/what-differences-in-morphologic-features-of-the-knee-exist-among-patients-of-various-races-a-systematic-review
#4
T K Kim, Mark Phillips, Mohit Bhandari, John Watson, Rajesh Malhotra
BACKGROUND: Most TKA prostheses are designed based on the anatomy of white patients. Individual studies have identified key anthropometric differences between the knees of the white population and other major ethnic groups, yet there is limited understanding of what these findings may indicate if analyzed collectively. QUESTION/PURPOSE: What are the differences in morphologic features of the distal femur and proximal tibia among and within various ethnicities? METHODS: A systematic review of the PubMed database and a hand-search of article bibliographies identified 235 potentially eligible English-language studies...
October 4, 2016: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/27680750/computerised-navigation-of-unicondylar-knee-prostheses-from-primary-implantation-to-revision-to-total-knee-arthroplasty
#5
Dominique Saragaglia, Benoit Marques Da Silva, Pierrick Dijoux, Jérémy Cognault, Julia Gaillot, Régis Pailhé
AIM: Computerized navigation of unicondylar knee arthroplasties (UKA) is not a widespread technique. The lifespan of a UKA depends on the quality of its implantation. We know that overcorrection leads to a rapid extension of the osteoarthritis to the opposite side of the knee and undercorrection to a rapid loosening or wear of the prosthesis. Because of these difficulties and following a long experience with navigation of total knee arthroplasties (TKA) and osteotomies around the knee, we began using navigation for revisions to TKA in 2003 and for UKAs in 2008...
September 28, 2016: International Orthopaedics
https://www.readbyqxmd.com/read/27597426/preoperative-patient-recorded-outcome-measures-predict-patient-discharge-location-following-unicondylar-knee-arthroplasty
#6
Alfonso E Ayala, Kevin A Lawson, Angelika C Gruessner, Michael P Dohm
BACKGROUND: Advantages of unicondylar knee arthroplasty (UKA) over total knee arthroplasty include rapid recovery and shorter lengths of stay following surgery. Patients requiring extended postoperative care fail to recognize these benefits. Patient-reported outcome measures have proved useful in predicting outcomes following joint arthroplasty. The purpose of this study was to identify and report preoperative patient-reported outcome measures and clinical variables that predict discharge to skilled nursing facilities following UKA...
August 10, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27492606/expectations-of-younger-patients-concerning-activities-after-knee-arthroplasty-are-we-asking-the-right-questions
#7
Suzanne Witjes, Rutger C I van Geenen, Koen L M Koenraadt, Cor P van der Hart, Leendert Blankevoort, Gino M M J Kerkhoffs, P Paul F M Kuijer
PURPOSE: Indications for total and unicondylar knee arthroplasty (KA) have expanded to younger patients, in which Patient-Reported Outcome Measures (PROMs) often show ceiling effects. This might be due to higher expectations. Our aims were to explore expectations of younger patients concerning activities in daily life, work and leisure time after KA and to assess to what extent PROMs meet and evaluate these activities of importance. METHODS: Focus groups were performed among osteoarthritis (OA) patients <65 years awaiting KA, in which they indicated what activities they expected to perform better in daily life, work and leisure time after KA...
August 5, 2016: Quality of Life Research
https://www.readbyqxmd.com/read/27436195/cementless-fixation-in-medial-unicompartmental-knee-arthroplasty-a-systematic-review
#8
S Campi, H G Pandit, C A F Dodd, D W Murray
PURPOSE: The aim of this study was to evaluate clinical outcome, failures, implant survival, and complications encountered with cementless fixation in unicompartmental knee arthroplasty (UKA). METHODS: A systematic review of the literature on cementless fixation in UKA was performed according to the PRISMA guidelines. The following database was comprehensively searched: PubMed, Cochrane, Medline, CINAHL, Embase, and Google Scholar. The keywords "unicompartmental", "unicondylar", "partial knee arthroplasty", and "UKA" were combined with each of the keyword "uncemented", "cementless" and "survival", "complications", and "outcome"...
July 19, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/27436194/balancing-mobile-bearing-unicondylar-knee-arthroplasty-in-vitro
#9
Thomas J Heyse, Joshua Slane, Geert Peersman, Philipp Dworschak, Susanne Fuchs-Winkelmann, Lennart Scheys
PURPOSE: Balancing mobile-bearing (MB) unicondylar knee arthroplasty (UKA) is challenging. If performed improperly, potential complications include pain, implant loosening, or progression of osteoarthritis in the preserved compartment. The purpose of this study was to document effects of improper balancing on knee kinematics and joint contact stress. It was hypothesized that over-stuffing would lead to more valgus and higher lateral contact force. METHODS: Seven fresh-frozen cadaver legs were mounted in a kinematic rig that applied three motion patterns to the specimens: passive flexion-extension, open chain extension, and squatting...
July 19, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/27269236/the-use-of-unicondylar-cement-spacers-as-a-bone-preserving-measure-in-two-stage-revision-knee-arthroplasty
#10
P Reynolds, S M Blake
No abstract text is available yet for this article.
June 6, 2016: Annals of the Royal College of Surgeons of England
https://www.readbyqxmd.com/read/27049194/the-difficult-primary-total-knee-arthroplasty
#11
Arthur L Malkani, Kirby D Hitt, Sameer Badarudeen, Courtland Lewis, Jeffrey Cherian, Randa Elmallah, Michael A Mont
Primary total knee arthroplasty (TKA) for the treatment of knee arthritis has substantially increased over the past decade. Because of its success, the indications for primary TKA have expanded to include younger patients who are more active, elderly patients who have multiple comorbidities, and patients who have more complex issues, such as posttraumatic arthritis and severe deformity. TKA also has been used to salvage failed unicondylar arthroplasty and osteotomies about the knee. Exposure may be challenging and outcomes may not be as successful in patients with soft-tissue contractures, such as a stiff knee, who undergo TKA...
2016: Instructional Course Lectures
https://www.readbyqxmd.com/read/27004680/comparative-fixation-and-subsidence-profiles-of-cementless-unicompartmental-knee-arthroplasty-implants
#12
Gokce Yildirim, Ananthkrishnan Gopalakrishnan, Robert A Davignon, John W Parker, Harshvardhan Chawla, Andrew D Pearle
BACKGROUND: Aseptic loosening is the primary cause of failure for both cemented and cementless unicondylar knee replacements (UKRs). Micromotion and subsidence of tibial baseplate are two causes of failure, due to poor fixation and misalignment, respectively. METHODS: Stair ascent activity profiles from Bergmann et al and Li et al were used. Biphasic Sawbones models were prepared according to the surgical techniques of traditional and novel cementless UKRs. Implants were tested for 10,000 cycles representing post-operative bone interdigitation period, and micromotion was observed using speckle pattern measurements, which demonstrated sufficient resolution...
September 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/26984107/-partial-replacement-of-the-knee-joint-with-patient-specific-instruments-and-implants-conformis-iuni-iduo
#13
J Beckmann, A Steinert, C Zilkens, A Zeh, C Schnurr, M Schmitt-Sody, M Gebauer
Knee arthroplasty is a successful standard procedure in orthopedic surgery; however, approximately 20 % of patients are dissatisfied with the clinical results as they suffer pain and can no longer achieve the presurgery level of activity. According to the literature the reasons are inexact fitting of the prosthesis or too few anatomically formed implants resulting in less physiological kinematics of the knee joint. Reducing the number of dissatisfied patients and the corresponding number of revisions is an important goal considering the increasing need for artificial joints...
April 2016: Der Orthopäde
https://www.readbyqxmd.com/read/26979765/knee-extensor-strength-and-gait-characteristics-after-minimally-invasive-unicondylar-knee-arthroplasty-vs-minimally-invasive-total-knee-arthroplasty-a-nonrandomized-controlled-trial
#14
Matthias Braito, Johannes M Giesinger, Stefan Fischler, Arnold Koller, David Niederseer, Michael C Liebensteiner
BACKGROUND: In light of the existing lack of evidence, it was the aim of this study to compare gait characteristics and knee extensor strength after medial unicondylar knee arthroplasty (MUKA) with those after total knee arthroplasty (TKA), given the same standardized minimally invasive surgery (MIS) approach in both groups. METHODS: Patients scheduled for MIS-MUKA or MIS-TKA as part of clinical routine were invited to participate. A posterior cruciate ligament-retaining total knee design was used for all MIS-TKA...
August 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/26744336/return-to-sports-and-physical-activity-after-total-and-unicondylar-knee-arthroplasty-a-systematic-review-and-meta-analysis
#15
Suzanne Witjes, Vincent Gouttebarge, P Paul F M Kuijer, Rutger C I van Geenen, Rudolf W Poolman, Gino M M J Kerkhoffs
BACKGROUND: People today are living longer and want to remain active. While obesity is becoming an epidemic, the number of patients suffering from osteoarthritis (OA) is expected to grow exponentially in the coming decades. Patients with OA of the knee are progressively being restricted in their activities. Since a knee arthroplasty (KA) is a well accepted, cost-effective intervention to relieve pain, restore function and improve health-related quality of life, indications are expanding to younger and more active patients...
February 2016: Sports Medicine
https://www.readbyqxmd.com/read/26605256/medial-unicondylar-knee-arthroplasty-technical-pearls
#16
Filippo Boniforti
Unicondylar knee arthroplasty implantation is extremely demanding as the prosthesis needs to be integrated in the natural anatomy of the knee. It ensures the integrity of the natural knee kinematic. Some studies and registries data have shown lower success rate in comparison with total knee arthroplasty, and patient-related factors may have an impact on outcome. While, better results have been published by high volume centres. The indications for surgery should be reconsidered critically, even if medial osteoarthritis of the knee remains the most common...
April 2015: Joints
https://www.readbyqxmd.com/read/26601062/minimally-invasive-knee-arthroplasty-an-overview
#17
REVIEW
Alfred J Tria, Giles R Scuderi
Minimally invasive surgery (MIS) for arthroplasty of the knee began with surgery for unicondylar knee arthroplasty (UKA). Partial knee replacements were designed in the 1970s and were amenable to a more limited exposure. In the 1990s Repicci popularized the MIS for UKA. Surgeons began to apply his concepts to total knee arthroplasty. Four MIS surgical techniques were developed: quadriceps sparing, mini-mid vastus, mini-subvastus, and mini-medial parapatellar. The quadriceps sparing technique is the most limited one and is also the most difficult...
November 18, 2015: World Journal of Orthopedics
https://www.readbyqxmd.com/read/26581364/balancing-uka-overstuffing-leads-to-high-medial-collateral-ligament-strains
#18
Thomas J Heyse, Bilal F El-Zayat, Ronny De Corte, Lennart Scheys, Yan Chevalier, Susanne Fuchs-Winkelmann, Luc Labey
PURPOSE: Balancing unicondylar knee arthroplasty (UKA) is challenging. If not performed properly, it may lead to implant loosening or progression of osteoarthritis in the preserved compartment. This study was aimed to document the biomechanical effects of improper balancing. We hypothesised that overstuffing would lead to more valgus, higher strain in the medial collateral ligament (sMCL), and higher lateral contact force. METHODS: Six fresh-frozen cadaver specimens were mounted in a kinematic rig...
October 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/26506144/the-effect-of-adductor-canal-blockade-on-outcome-after-medial-unicondylar-knee-arthroplasty-a-preliminary-study
#19
Matthew L Brown, Thorsten M Seyler, John Allen, Johannes F Plate, Daryl S Henshaw, Jason E Lang
INTRODUCTION: Unicondylar knee arthroplasty (UKA) offers decreased morbidity, faster recovery, better functional outcomes, and equivalent survivorship compared to TKA for certain patients. To fully capture these benefits, regional anesthesia techniques must facilitate rather than compromise patients ability for early postoperative mobilization and safe discharge following UKA. The purpose of this study was to determine whether the predominantly sensory adductor canal blockade (ACB) shortens hospital stay after medial UKA (mUKA)...
July 2015: Bulletin of the Hospital for Joint Diseases
https://www.readbyqxmd.com/read/26476471/shorter-hospital-stay-and-lower-30-day-readmission-after-unicondylar-knee-arthroplasty-compared-to-total-knee-arthroplasty
#20
COMPARATIVE STUDY
Justin Drager, Adam Hart, Jad Abou Khalil, David J Zukor, Stephane G Bergeron, John Antoniou
BACKGROUND: Reducing hospital stay and unplanned hospital readmission of arthroplasty patients has been a topic of recent interest. The aim of the present study was to query the National Surgical Quality Improvement Program database to compare the length of hospital stay (LOS) and the subsequent 30-day hospital readmission rates in patients undergoing primary unicondylar knee arthroplasty (UKA) and total knee arthroplasty (TKA). METHODS: We identified 1340 UKAs and 36,274 TKAs over a 2-year period (2011-2012)...
February 2016: Journal of Arthroplasty
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