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https://www.readbyqxmd.com/read/28336150/effects-of-foot-rotation-positions-on-knee-valgus-during-single-leg-drop-landing-implications-for-acl-injury-risk-reduction
#1
P S P Teng, P W Kong, K F Leong
BACKGROUND: Non-contact anterior cruciate ligament (ACL) injuries commonly occur when athletes land in high risk positions such as knee valgus. The position of the foot at landing may influence the transmission of forces from the ankle to the knee. Using an experimental approach to manipulate foot rotation positions, this study aimed to provide new insights on how knee valgus during single-leg landing may be influenced by foot positions. METHODS: Eleven male recreational basketball players performed single-leg drop landings from a 30-cm high platform in three foot rotation positions (toe-in, toe-forward and toe-out) at initial contact...
March 20, 2017: Knee
https://www.readbyqxmd.com/read/28336149/the-acl-injury-response-a-collagen-based-analysis
#2
Joshua S Everhart, John H Sojka, Christopher C Kaeding, Alicia L Bertone, David C Flanigan
BACKGROUND: Anterior cruciate ligament (ACL) injuries do not effectively heal. Tendon graft tissue after reconstruction shows rapid tissue turnover and 'ligamentization.' It is unknown whether native torn ACL tissue undergoes significant collagen turnover after injury or is arrested by the intraarticular environment. It is also unknown whether injury mechanism or chronicity affect torn ligament tissue turnover. METHODS: Thirty-three mid-substance ACL biopsies were obtained during primary arthroscopic ACL reconstruction (n=31; nine contact injuries, 22 non-contact injuries, 22 males, 11 females; mean age 28...
March 20, 2017: Knee
https://www.readbyqxmd.com/read/28336148/preoperative-body-mass-index-and-physical-function-are-associated-with-length-of-stay-and-facility-discharge-after-total-knee-arthroplasty
#3
Matthew G Prohaska, Benjamin J Keeney, Haaris A Beg, Ishaan Swarup, Wayne E Moschetti, Stephen R Kantor, Ivan M Tomek
BACKGROUND: Hospital length of stay (LOS) and facility discharge are primary drivers of the cost of total knee arthroplasty (TKA). We sought to identify modifiable patient factors that were associated with increased LOS and facility discharge after TKA. METHODS: Prospective data were reviewed from 716 consecutive, primary TKA procedures performed by two arthroplasty surgeons between 2006 and 2012 at a single institution. Preoperative body mass index (BMI), Veterans RAND-12 (VR-12) physical component score (PCS), and hemoglobin level were collected in addition to other adjusters...
March 20, 2017: Knee
https://www.readbyqxmd.com/read/28330757/does-new-instrumentation-improve-radiologic-alignment-of-the-oxford%C3%A2-medial-unicompartmental-knee-arthroplasty
#4
Ki-Mo Jang, Hong Chul Lim, Seung-Beom Han, Chandong Jeong, Seul-Gi Kim, Ji-Hoon Bae
BACKGROUND: A new instrument system has been introduced to improve the accuracy and reproducibility of implant positioning in Oxford® unicompartmental knee arthroplasty (UKA). This study aimed to determine if the new instrumentation could improve postoperative implant positioning and limb alignment, and reduce the occurrence of outliers in Oxford® UKA. METHODS: A total of 77 cases of Oxford® UKA with the new instrumentation were included. Individual matching for the conventional instrument group was performed according to age, sex, and body mass index...
March 19, 2017: Knee
https://www.readbyqxmd.com/read/28330756/femoral-articular-geometry-and-patellofemoral-stability
#5
Farhad Iranpour, Azhar M Merican, Seow Hui Teo, Justin P Cobb, Andrew A Amis
BACKGROUND: Patellofemoral instability is a major cause of anterior knee pain. The aim of this study was to examine how the medial and lateral stability of the patellofemoral joint in the normal knee changes with knee flexion and measure its relationship to differences in femoral trochlear geometry. METHODS: Twelve fresh-frozen cadaveric knees were used. Five components of the quadriceps and the iliotibial band were loaded physiologically with 175N and 30N, respectively...
March 19, 2017: Knee
https://www.readbyqxmd.com/read/28325552/unplanned-readmissions-after-primary-total-knee-arthroplasty-in-korean-patients-rate-causes-and-risk-factors
#6
Seon Woo Lee, Kiran Kumar Gn, Tae Kyun Kim
BACKGROUND: Unplanned hospital readmissions are indicators of the quality and performance of a health care system, but data on early readmission after primary total knee arthroplasty (TKA) in the Asian population are limited. The purpose of this study was to determine the causes, risk factors, and rate of unplanned readmission after primary TKA at a single institution in Korea. METHODS: We analyzed all primary TKAs from 2004 to 2013 using the data from our institutional electronic database...
March 18, 2017: Knee
https://www.readbyqxmd.com/read/28325551/patient-related-risk-factors-for-infection-following-knee-arthroscopy-an-analysis-of-over-700-000-patients-from-two-large-databases
#7
Jourdan M Cancienne, Harrison S Mahon, Ian J Dempsey, Mark D Miller, Brian C Werner
BACKGROUND: To determine patient-related risk factors for infection following knee arthroscopy using two large databases. METHODS: A private-payer (PP) and Medicare national insurance database were queried for patients undergoing simple knee arthroscopy procedures from 2005 to 2015. Patients undergoing concomitant open or complex procedures with grafts were excluded. Postoperative infection within 90days was assessed using ICD-9 and CPT codes. A multivariate logistic regression analysis was utilized to evaluate patient-related risk factors for postoperative infection...
March 18, 2017: Knee
https://www.readbyqxmd.com/read/28318932/patellar-instability-treated-with-distal-femoral-osteotomy
#8
Ishaan Swarup, Osama Elattar, S Robert Rozbruch
BACKGROUND: Patellar instability can cause significant disability in both pediatric and adult patients, and it is associated with several factors including genu valgum. In this study, we describe the role of a lateral opening wedge distal femoral osteotomy (DFO) combined with lateral retinacular release in addressing genu valgum with associated patellar instability. The rationale for this approach is to medialize the patellar tendon insertion and decrease the Q angle with DFO. METHODS: A consecutive series of patients were studied, and our outcomes of interest included improvements in radiographic measures and patient outcomes...
March 17, 2017: Knee
https://www.readbyqxmd.com/read/28292568/management-of-septic-arthritis-after-arthroscopic-anterior-cruciate-ligament-reconstruction-using-a-standard-surgical-protocol
#9
Michael E Hantes, Vasilios A Raoulis, Nikolaos Doxariotis, Athanasios Drakos, Theofilos Karachalios, Konstantinos N Malizos
BACKGROUND: To report the incidence of septic arthritis after anterior cruciate ligament (ACL) reconstruction and management of this complication using a specific treatment protocol. METHODS: All primary ACL reconstructions performed in our institution between January 2002 and January 2014 were included in this study. Time to presentation, clinical symptoms, and culture results of all infected patients were analyzed. According to our protocol, an arthroscopic debridement and irrigation of the knee joint was performed immediately after a diagnosis of infection was made...
March 12, 2017: Knee
https://www.readbyqxmd.com/read/28279568/the-impact-of-symptomatic-knee-osteoarthritis-on-overall-gait-pattern-deviations-and-its-association-with-performance-based-measures-and-patient-reported-outcomes
#10
Josefine E Naili, Anna-Clara Esbjörnsson, Maura D Iversen, Michael H Schwartz, Margareta Hedström, Charlotte K Häger, Eva W Broström
BACKGROUND: Limited knowledge exists regarding the impact of symptomatic knee osteoarthritis (OA) on the overall gait pattern; and whether gait deviations are associated with performance-based measures (PBMs) and patient-reported outcomes (PROs). This cross-sectional study evaluated overall gait patterns in patients with knee OA using the Gait Deviation Index for kinematics (GDI) and kinetics (GDI-kinetic), and explored associations between gait deviations, PBMs, and PROs. METHODS: Forty patients with knee OA and 25 age and gender-matched controls underwent three-dimensional gait analysis...
March 6, 2017: Knee
https://www.readbyqxmd.com/read/28259540/letter-to-editor-intravenous-versus-intra-articular-tranexamic-acid-in-total-knee-arthroplasty-a-double-blinded-randomized-controlled-noninferiority-trial
#11
LETTER
https://www.readbyqxmd.com/read/28233605/total-knee-arthroplasty-with-computer-assisted-navigation-more-closely-replicates-normal-knee-biomechanics-than-conventional-surgery
#12
Jodie A McClelland, Kate E Webster, Alankar A Ramteke, Julian A Feller
BACKGROUND: Computer-assisted navigation in total knee arthroplasty (TKA) reduces variability and may improve accuracy in the postoperative static alignment. The effect of navigation on alignment and biomechanics during more dynamic movements has not been investigated. METHODS: This study compared knee biomechanics during level walking of 121 participants: 39 with conventional TKA, 42 with computer-assisted navigation TKA and 40 unimpaired control participants. RESULTS: Standing lower-limb alignment was significantly closer to ideal in participants with navigation TKA...
February 20, 2017: Knee
https://www.readbyqxmd.com/read/28215979/reply-to-letter-to-the-editor-on-intravenous-versus-intra-articular-tranexamic-acid-in-total-knee-arthroplasty-a-double-blinded-randomised-controlled-noninferiority-trial
#13
LETTER
Jerry Yongqiang Chen, Pak Lin Chin, Ing How Moo, Hee Nee Pang, Darren Keng Jin Tay, Shi-Lu Chia, Ngai Nung Lo, Seng Jin Yeo
No abstract text is available yet for this article.
February 16, 2017: Knee
https://www.readbyqxmd.com/read/28189409/registration-accuracy-enhancement-of-a-surgical-navigation-system-for-anterior-cruciate-ligament-reconstruction-a-phantom-and-cadaveric-study
#14
Youngjun Kim, Byung Hoon Lee, Kinde Mekuria, Hyunchul Cho, Sehyung Park, Joon Ho Wang, Deukhee Lee
BACKGROUND: Recently, surgical navigation systems have been widely used to improve the results of various orthopaedic surgeries. However, surgical navigation has not been successful in anterior cruciate ligament reconstruction, owing to its inaccuracy and inconvenience. This study investigated the registration of preoperative and intraoperative data, which are the key components in improving accuracy of the navigation system. METHODS: An accurate registration method was proposed using new optical tracking markers and landmark retake...
February 9, 2017: Knee
https://www.readbyqxmd.com/read/28189407/total-knee-arthroplasty-after-patellectomy-a-meta-analysis-of-case-control-studies
#15
Saeed Asadollahi, Rami Sorial, Simon Coffey, Manish Gupta, Guy D Eslick
BACKGROUND: Post-patellectomy patients represent a specific subset of patients who can develop painful and disabling knee osteoarthritis that requires Total Knee Arthroplasty (TKA). The aim of this study was to conduct a meta-analysis comparing the outcome of TKA in patients with previous patellectomy to those with an intact patella. METHODS: A systematic search of electronic databases (PubMed, Medline, Embase, and Cochrane Library) was performed. Data on study setting, type of implant, outcome and associated complications were extracted...
February 9, 2017: Knee
https://www.readbyqxmd.com/read/28189408/clinical-results-of-alumina-medial-pivot-total-knee-arthroplasty-at-a-minimum-follow-up-of-10years
#16
Suguru Nakamura, Yukihide Minoda, Shigeru Nakagawa, Yoshinori Kadoya, Susumu Takemura, Akio Kobayashi, Shigekazu Mizokawa, Yoichi Ohta, Sinji Takahashi, Kazumasa Yamamura, Hiroaki Nakamura
BACKGROUND: The medial pivot total knee prosthesis with alumina ceramic femoral components was introduced to reproduce physiological knee kinematics and reduce polyethylene wear. The five-year clinical outcomes of alumina medial pivot total knee arthroplasties (TKA) have previously been reported. The purpose of this study was to provide the longer-term clinical results at a minimum follow-up of 10years. METHODS: The clinical results of 70 alumina medial pivot TKA in 51 consecutive patients, with a minimum follow-up period of 10years, were evaluated...
February 8, 2017: Knee
https://www.readbyqxmd.com/read/28189406/surgical-treatments-of-cartilage-defects-of-the-knee-systematic-review-of-randomised-controlled-trials
#17
REVIEW
Brian M Devitt, Stuart W Bell, Kate E Webster, Julian A Feller, Tim S Whitehead
BACKGROUND: The aim of this systematic review was to identify high quality randomised controlled trials (RCTs) and to provide an update on the most appropriate surgical treatments for knee cartilage defects. METHODS: Two reviewers independently searched three databases for RCTs comparing at least two different treatment techniques for knee cartilage defects. The search strategy used terms mapped to relevant subject headings of MeSH terms. Strict inclusion and exclusion criteria were used to identify studies with patients aged between 18 and 55 years with articular cartilage defects sized between one and 15cm(2)...
February 8, 2017: Knee
https://www.readbyqxmd.com/read/28189405/comparison-of-articular-and-backside-polyethylene-wear-in-mobile-bearing-unicompartmental-knee-replacement
#18
Matthew G Teeter, James L Howard, Richard W McCalden, Douglas D Naudie
BACKGROUND: Unicompartmental knee replacement (UKR) is an alternative to total knee replacement for selected patients with isolated medial or lateral compartment osteoarthritis. One of the most popular UKR implants was introduced as a mobile-bearing design in part to reduce polyethylene wear. However, backside wear of the mobile-bearing implant has not been examined independently from the articular surface. METHODS: Sixteen retrieved polyethylene inserts from a medial mobile-bearing UKR from 16 patients were examined after an average of 4...
February 8, 2017: Knee
https://www.readbyqxmd.com/read/28189404/minimally-invasive-surgery-mis-for-total-knee-replacement-medium-term-results-with-minimum-five-year-follow-up
#19
Olivia Unwin, Mohammed Hassaballa, James Murray, William Harries, Andrew Porteous
BACKGROUND: MIS TKA has been shown to offer a reduced in-patient stay, but no clinical difference at two years. Whilst there may be a benefit from earlier discharge, we need to ensure that there are no detrimental effects in the medium and long-term following MIS-TKA. To report the mid-term result from a prospective randomised controlled trial (RCT) comparing MIS-TKA with standard approach for TKA. METHODS: Using knee score questionnaires, we collected patient reported outcome measures (PROMs) regarding pain and function...
February 8, 2017: Knee
https://www.readbyqxmd.com/read/28188084/biomechanical-evaluation-of-knee-endpoint-during-anterior-tibial-loading-implication-for-physical-exams
#20
Ata A Rahnemai-Azar, Fabio V Arilla, Kevin M Bell, Freddie H Fu, Volker Musahl, Richard E Debski
BACKGROUND: Physical exams that apply anterior tibial loads are typically used to evaluate knees with anterior cruciate ligament (ACL) injuries. The amount of anterior tibial translation that occurs during these exams can be difficult to assess due to a "soft" endpoint. Therefore, the objective of this study is to determine the biomechanical characteristics of the endpoint for the intact and ACL deficient knee using quantitative criteria. METHODS: Eight porcine knees were tested using a robotic testing system...
February 7, 2017: Knee
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