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https://www.readbyqxmd.com/read/27912929/survival-failure-modes-and-function-of-combined-distal-femur-and-proximal-tibia-reconstruction-following-tumor-resection
#1
F Sevelda, W Waldstein, J Panotopoulos, C Stihsen, A Kaider, P T Funovics, R Windhager
BACKGROUND: Tumor spread to the knee joint or skip metastasis to the adjacent bones of the knee require reconstruction with combined distal femur and proximal tibia replacements. The literature on implant survival and failure modes with this type of reconstruction is sparse. The goals of this study were to determine the implant survival, the different failure modes and the functional outcome of this megaendoprosthetic reconstruction. PATIENTS AND METHODS: Thirty-nine patients with combined distal femur and proximal tibia reconstruction were retrospectively reviewed...
November 23, 2016: European Journal of Surgical Oncology
https://www.readbyqxmd.com/read/27904720/clinical-results-of-lateral-unicompartmental-knee-arthroplasty-minimum-2-year-follow-up
#2
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/27904221/what-have-we-learned-from-100-success-of-press-fit-condylar-rotating-platform-posterior-stabilized-knees-a-5-10-years-followup-by-a-nondesigner
#3
Shrinand V Vaidya, Siddharth Virani, Rajendra Phunde, Abhishek Mahajan
BACKGROUND: Total joint arthroplasties of the hip and knee represent a remarkable feat of modern medicine in terms of reducing pain and restoring function to millions of patients afflicted with severe arthritis. Oftentimes, the performance and longevity of new implants and devices are based on limited data. This is the first study by a non-designer on the press fit condylar rotating platform posterior stabilized (PFC-RP-PS) design with 100' success. This has a relevance, vis-á -vis bias that one may have in terms of reproducibility of technique and funding from the manufacturer...
November 2016: Indian Journal of Orthopaedics
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
#4
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
https://www.readbyqxmd.com/read/27898357/catastrophic-metallosis-after-tumoral-knee-prosthesis-failure-a-case-report
#5
Luca La Verde, Domenico Fenga, Maria Silvia Spinelli, Francesco Rosario Campo, Michela Florio, Michele Attilio Rosa
INTRODUCTION: Metallosis is a condition characterized by an infiltration of periprosthetic soft tissues and bone by metallic debris resulting from wear or failure of joint arthroplasties. PRESENTATION OF CASE: Authors describe a case of a 45-year-old man treated for an osteosarcoma of the distal femur with a modular prosthesis when he was 18 years old, he developed massive metallosis with skin dyspigmentation after 17 years. His medical\surgical history was remarkable for a left tumoral knee prosthesis implanted 21 years ago...
November 18, 2016: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/27895368/does-obesity-affects-early-infection-after-total-knee-arthroplasty-a-comparison-of-obese-vs-non-obese-patients
#6
Waseem Ahmed, Riaz Hussain Lakdawala, Yasir Mohib, Aurangzeb Qureshi, Rizwan Haroon Rashid
Surgical site infection (SSI) is a disastrous complication after total knee arthroplasty (TKA) which can cause prosthesis loosening and may end up in septicaemia. The incidence of infection reported to be in the range of 0.3-12.4% for primary TKA. Significantly higher infection rate is found in the morbidly obese patients. The current study compared the immediate rate of post-total knee replacement wound infection in the obese versus non-obese population. The cross-sectional study was conducted at Aga Khan University Hospital (AKUH) and comprised patients undergoing TKA for primary knee osteoarthritis...
October 2016: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/27890623/sirt1-protects-osteoblasts-against-particle-induced-inflammatory-responses-and-apoptosis-in-aseptic-prosthesis-loosening
#7
Zhantao Deng, Zhenheng Wang, Jiewen Jin, Yong Wang, Nirong Bao, Qian Gao, Jianning Zhao
: We hypothesized that SIRT1 downregulation in osteoblasts induced by wear particles was one of the reasons for particle-induced osteolysis (PIO) in total joint arthroplasty failure. In the present study, the expression of SIRT1 was examined in osteoblasts treated with TiAl6V4 particles (TiPs) and CoCrMo particles (CoPs) from materials used in prosthetics and specimens from PIO animal models. To address whether SIRT1 downregulation triggers inflammatory responses and apoptosis in osteoblasts, the effect of a SIRT1 activator, resveratrol on the expression of inflammatory cytokines and apoptosis in particle-treated osteoblasts was tested...
November 23, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27888317/effect-of-tibial-slope-changes-on-femorotibial-contact-kinematics-after-cruciate-retaining-total-knee-arthroplasty
#8
Xi-Qing Pan, A-Qin Peng, Fei Wang, Feng Li, Xi-Zeng Nie, Xi Yang, Gang Ji, Xiao-Meng Wang
PURPOSE: The present study was undertaken to evaluate the effect of tibial slope (TS) changes on the femorotibial articular contact kinematics in subjects undergoing posterior cruciate-retaining total knee arthroplasty (CRTKA). METHODS: Eighteen knees in nine patients with medial osteoarthritis who underwent CRTKA using the same size prosthesis were analysed preoperatively and 2 years after TKA. TS changes were calculated on lateral radiographs taken before and after TKA...
November 25, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/27882029/effects-of-comprehensive-rehabilitation-training-in-combination-with-multi-mode-analgesia-on-body-function-recovery-after-tumor-type-knee-replacement
#9
Junjuan Zhang, Yahan Wang, Guangyu Yang, Jing Liu, Junjie Wang
OBJECTIVE: To discuss the significance of comprehensive rehabilitation training combined with multimodal analgesia (MMA) for the early knee function recovery of patients with knee bone tumor who underwent prosthesis replacement operation. METHODS: Sixty patients with knee bone tumor who underwent prosthesis replacement operation were selected and randomly divided into two groups according to rehabilitation training and postoperative analgesic methods, namely, observation group and control group, 30 cases in each group...
September 2016: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/27865479/evaluation-of-knee-functional-calibration-with-and-without-the-effect-of-soft-tissue-artefact
#10
Morgan Sangeux, Arnaud Barré, Kamiar Aminian
Functional calibration methods were devised to improve repeatability and accuracy of the knee flexion-extension axis, which is used to define the medio-lateral axis of the femur coordinate system in gait analysis. Repeatability of functional calibration methods has been studied extensively in healthy individuals, but not accuracy in the absence of a benchmark knee axis. We captured bi-plane fluoroscopy data of the knee joint in 17 subjects with unilateral total knee arthroplasty during treadmill walking. The prosthesis provided a benchmark knee axis to evaluate the functional calibration methods...
November 2, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27864564/hierarchical-structure-and-importance-of-patients-reasons-for-treatment-choices-in-knee-and-hip-osteoarthritis-a-concept-mapping-study
#11
Ellen M H Selten, Rinie Geenen, Willemijn H van der Laan, Roelien G van der Meulen-Dilling, Henk J Schers, Marc W Nijhof, Cornelia H M van den Ende, Johanna E Vriezekolk
OBJECTIVES: To improve patients' use of conservative treatment options of hip and knee OA, in-depth understanding of reasons underlying patients' treatment choices is required. The current study adopted a concept mapping method to thematically structure and prioritize reasons for treatment choice in knee and hip OA from a patients' perspective. METHODS: Multiple reasons for treatment choices were previously identified using in-depth interviews. In consensus meetings, experts derived 51 representative reasons from the interviews...
November 17, 2016: Rheumatology
https://www.readbyqxmd.com/read/27855716/kinematic-analysis-of-posterior-stabilized-total-knee-arthroplasty-during-standing-up-from-and-sitting-down-on-a-chair
#12
Takatomo Mine, Kenji Hoshi, Kazuyoshi Gamada, Koichiro Ihara, Hiroyuki Kawamura, Ryutaro Kuriyama, Ryo Date
BACKGROUND: Total knee arthroplasty is effective to regain quality of life. Standing up from and sitting down on a chair and stair stepping motion are important in daily living. We previously reported in vivo kinematics of this implant during a stepping exercise. The purpose of this analysis was to assess in vivo knee motion during standing up from and sitting down on a chair and determine the motion pattern in patients with the unique knee prosthesis. METHODS: A total of 15 patients implanted with Bi-Surface PS were assessed during standing up from and sitting down on a chair...
November 17, 2016: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/27855612/99mtc-labeled-white-blood-cell-scan-as-a-guide-to-open-biopsy-in-the-management-of-hip-and-knee-prosthesis-infection-preliminary-results
#13
Mauro Liberatore, Giuseppe Gentile, Giulia Anna Follacchio, Viviana Frantellizzi, Giuseppe De Vincentis, Francesco Monteleone, Christos Anagnostou, Francesco Maria Drudi, Vittorio Calvisi
The aim of the present prospective study was to evaluate the usefulness of labeled leukocyte scan as a guide to open biopsy for the management of hip and knee prosthesis infection in patients without loosening of orthopedic device. Twenty-six patients with suspected hip (24) and knee (2) prosthesis infection underwent routine analysis of blood, plain radiography and 99m Tc-HMPAO labelled leukocyte scan (WBCS). On these basis, patients were subdivided in the following groups: bone infection without loosening (n°=14), septic loosening (n°=8), superficial infection (n°=2), no infection (n°=2)...
November 17, 2016: Current Radiopharmaceuticals
https://www.readbyqxmd.com/read/27846360/-non-traumatic-posterior-instability-in-primary-total-knee-replacement-and-its-revision
#14
E Carbó, R Laguna, F Del Moral, J Barrientos, J Vaquero
BACKGROUND: Dislocation after total knee arthroplasty is a rare complication and a difficult problem to address. When the flexion gap is larger than the extension gap and the collateral ligaments are injured, instability and knee arthroplasty dislocation can occur. MATERIAL AND METHODS: We report the case of a patient presenting with a posterior dislocation of a posterior-stabilized prosthesis without trauma. Frank instability in varus stress test and a positive anterior drawer test with tibial internal rotation dismissed the conservative treatment...
March 2016: Acta Ortopédica Mexicana
https://www.readbyqxmd.com/read/27837176/chondrocyte-proliferation-viability-and-differentiation-is-declined-following-administration-of-methylphenidate-utilized-for-the-treatment-of-attention-deficit-hyperactivity-disorder
#15
F Gumustas, I Yilmaz, D Y Sirin, S A Gumustas, A G Batmaz, M Isyar, S Akkaya, M Mahirogullari
PURPOSE: Methylphenidate (MPH) derivative drugs are used because of psychostimulants effects on attention-deficit hyperactivity disorder in children and adults. As far as we know, toxic or anti-proliferative effects of MPH against cartilage tissue were not studied in the literature. The present study was carried out to investigate the possible effects of MPH on the proliferation, viability and differentiation of primary human chondrocytes, in vitro. METHODS: Monolayer primary chondrocyte cultures were prepared using osteochondral tissue obtained from patients who underwent a total knee prosthesis operation...
November 11, 2016: Human & Experimental Toxicology
https://www.readbyqxmd.com/read/27829422/indication-criteria-for-total-hip-or-knee-arthroplasty-in-osteoarthritis-a-state-of-the-science-overview
#16
Maaike G J Gademan, Stefanie N Hofstede, Thea P M Vliet Vlieland, Rob G H H Nelissen, Perla J Marang-van de Mheen
BACKGROUND: This systematic review gives an overview of guidelines and original publications as well as the evidence on which the currently proposed indication criteria are based. Until now such a state-of-the-science overview was lacking. METHODS: Websites of orthopaedic and arthritis organizations (English/Dutch language) were independently searched by two authors for THA/TKA guidelines for OA. Furthermore, a systematic search strategy in several databases through August 2014 was performed...
November 9, 2016: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/27825937/effects-of-measurement-methods-for-tibial-rotation-axis-on-the-morphometry-in-korean-populations-by-gender
#17
Kyoung-Tak Kang, Juhyun Son, Oh-Ryong Kwon, Changhyun Baek, Dong Beom Heo, Kyoung-Mi Park, Ho-Joong Kim, Yong-Gon Koh
BACKGROUND: There have been arguments for methodology in tibial rotation axis measurement, which accordingly determines the morphometry of the proximal tibia in total knee arthroplasty. The morphometry of the proximal tibia for the Korean population is determined by gender, based on the anatomical tibial axis and reliable rotational orientation in knee replacements, to evaluate the size suitability of the currently available prostheses in Korea. METHODS: This study reconstructed the MRI images in three-dimensions for identification and measurement of the mediolateral (ML) and anteroposterior (AP) lengths of the proximal tibia and the tibial aspect ratio (ML/AP) using proximal tibial anthropometric data for 700 osteoarthritic knees (587 females and 113 males)...
November 5, 2016: Knee
https://www.readbyqxmd.com/read/27825417/evaluation-of-the-morphology-and-function-of-medial-collateral-ligament-aftertotal-knee-arthroplasty-with-high-frequency-ultrasound
#18
Ling Jiang, Yan-Qing Liu, Li-Gang Cui, Ying Meng, Hua Tian, Ke Zhang, Jin-Rui Wang
Objective To explore the feasibility and clinical value of ultrasonography in evaluating the morphology and function of medial collateral ligaments (MCL) after total knee arthroplasty (TKA). Methods Totally 38 patients undergoing routine KTA (group A) and 22 patients undergoing constrained condylar knee arthroplasty KTA with MCL injury (group B) were included. Long axis views of MCL were taken and the MCL thickness was measured on femur side and tibial side 1 cm away from the joint line, respectively. The thicknesses were compared between the two groups...
October 10, 2016: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
https://www.readbyqxmd.com/read/27817981/morphometry-of-femoral-rotation-for-total-knee-prosthesis-according-to-gender-in-a-korean-population-using-three-dimensional-magnetic-resonance-imaging
#19
Kyoung-Tak Kang, Juhyun Son, Oh-Ryong Kwon, Changhyun Baek, Dong Beom Heo, Kyoung-Mi Park, Ho-Joong Kim, Yong-Gon Koh
BACKGROUND: We aimed to evaluate differences in femoral arthometric data for 700 osteoarthritic knees (587 females and 113 males) with respect to gender in a Korean population. METHODS: We identified and measured the mediolateral (ML) and anteroposterior (AP) lengths, femoral aspect ratio (ML/AP), surgical epicondylar axis (SEA), and Whiteside's line (WL). In addition, the anterior, posterior, and distal bone resections of the implanted femurs were evaluated using SEA and WL as references using a three-dimensional analysis method...
November 4, 2016: Knee
https://www.readbyqxmd.com/read/27815957/staphylococcus-lugdunensis-septic-arthritis-of-a-native-knee-a-case-report
#20
John P Begly, Michael Sobieraj, Frank A Liporace, Alan Dayan
A 67-year-old man presented to orthopaedic care with a painful knee. Workup was consistent with septic arthritis of a native knee, and the patient underwent operative treatment. Cultures from the operating room were speciated to Staphylococcus lugdunensis. To the investigators' knowledge, this is the first reported S. lugdunensis infection in a peripheral joint in the absence of an orthopaedic prosthesis. Although traditionally associated with infectious endocarditis, S. lugdunensis has been identified as a causative agent in many organ systems, including orthopaedic infections...
November 2016: Bulletin of the Hospital for Joint Diseases
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