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https://www.readbyqxmd.com/read/29773405/gender-differences-in-knee-morphology-and-the-prospects-for-implant-design-in-total-knee-replacement
#1
Malte Asseln, Christoph Hänisch, Fabian Schick, Klaus Radermacher
BACKGROUND: Morphological differences between female and male knees have been reported in the literature, which led to the development of so-called gender-specific implants. However, detailed morphological descriptions covering the entire joint are rare and little is known regarding whether gender differences are real sexual dimorphisms or can be explained by overall differences in size. METHODS: We comprehensively analysed knee morphology using 33 features of the femur and 21 features of the tibia to quantify knee shape...
May 14, 2018: Knee
https://www.readbyqxmd.com/read/29773404/large-tibial-geode-which-developed-several-years-after-a-left-medial-oxford-unicondylar-knee-arthroplasty-treated-with-curettage-and-bone-grafting
#2
Matthew K Curran, James R Murray
BACKGROUND: Tibial geodes are rare, and usually reported in association with rheumatoid arthritis. This case study reported the rare occurrence of a tibial geode in association with a left unicondylar knee arthroplasty (UKA). The patient, a 55-year-old male, was initially pleased with his UKA, which was performed at another institution. However, just over one year after the operation he began experiencing pain and discomfort. He did not present to the current institution until he was six years after UKA...
May 14, 2018: Knee
https://www.readbyqxmd.com/read/29752207/a-cross-sport-comparison-of-performance-based-outcomes-of-professional-athletes-following-primary-microfracture-of-the-knee
#3
Michael S Schallmo, Sameer K Singh, Kathryn A Barth, Ryan D Freshman, Harry T Mai, Wellington K Hsu
BACKGROUND: The purpose of this study was to compare performance-based outcomes among professional athletes in four major North American sports following microfracture to treat symptomatic chondral defects of the knee. METHODS: Major League Baseball (MLB), National Basketball Association (NBA), National Football League (NFL), and National Hockey League (NHL) athletes who underwent primary unilateral microfracture of the knee were identified through a previously reported protocol based on public sources...
May 8, 2018: Knee
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/29748140/bone-microarchitecture-of-the-tibial-plateau-in-skeletal-health-and-osteoporosis
#5
Matthias Krause, Jan Hubert, Simon Deymann, Alexander Hapfelmeier, Birgit Wulff, Andreas Petersik, Klaus Püschel, Michael Amling, Thelonius Hawellek, Karl-Heinz Frosch
BACKGROUND: Impaired bone structure poses a challenge for the treatment of osteoporotic tibial plateau fractures. As knowledge of region-specific structural bone alterations is a prerequisite to achieving successful long-term fixation, the aim of the current study was to characterize tibial plateau bone structure in patients with osteoporosis and the elderly. METHODS: Histomorphometric parameters were assessed by high-resolution peripheral quantitative computed tomography (HR-pQCT) in 21 proximal tibiae from females with postmenopausal osteoporosis (mean age: 84...
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
#6
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/29731319/the-influence-of-tibial-slope-on-the-graft-in-combined-high-tibial-osteotomy-and-anterior-cruciate-ligament-reconstruction
#7
Philipp Schuster, Markus Geßlein, Michael Schlumberger, Philipp Mayer, Jörg Richter
BACKGROUND: Young patients with severe medial osteoarthritis, varus malalignment and insufficiency of the anterior cruciate ligament (ACL) are difficult to treat. The tibial slope has gained attention with regard to osteotomies and ligamentous instability. The purpose was to evaluate the outcome of combined high tibial osteotomy (HTO), ACL reconstruction and chondral resurfacing (CR, abrasion plus microfracture), and to analyse graft failure rates with regard to the tibial slope. METHODS: Fifty cases (48...
May 3, 2018: Knee
https://www.readbyqxmd.com/read/29705075/effectiveness-of-continuous-versus-single-injection-femoral-nerve-block-for-total-knee-arthroplasty-a-double-blinded-randomized-trial
#8
Varun Dixit, Samreen Fathima, Stephen M Walsh, Alexandru Seviciu, Ivan Schwendt, Karl-Heinz Spittler, Dana Briggs
BACKGROUND: Effective analgesia following total knee arthroplasty (TKA) is important for maximizing patient satisfaction, early participation in physical therapy and reducing the hospital stay. This trial compared continuous catheter femoral nerve block (cFNB) to single injection femoral nerve block (sFNB) in terms of analgesia, opioid consumption, and participation in physical therapy and associated side effects. METHODS: This randomized, double blinded trial was conducted in a non-university hospital setting, without major changes to anesthesia or surgical clinical pathways...
April 26, 2018: Knee
https://www.readbyqxmd.com/read/29705076/stereophotogrammetric-surface-anatomy-of-the-anterior-cruciate-ligament-s-tibial-footprint-precise-osseous-structure-and-distances-to-arthroscopically-relevant-landmarks
#9
Carlos Quiles, Juan A Constantino, Yolanda Gañán, Domingo Macías, Manuel Quiles
BACKGROUND: While femoral tunnel malposition is widely recognized as the main technical error of failed anterior cruciate ligament (ACL) surgery, tibial tunnel malposition is likely underrecognized and underappreciated. PURPOSE: To describe more precisely the qualitative and quantitative anatomy of the ACL's tibial attachment in vitro using widely available technology for stereophotogrammetric surface reconstruction, and to test its applicability in vivo. METHODS: Stereophotogrammetric surface reconstruction was obtained from fourteen proximal tibias of cadaver donors...
April 25, 2018: Knee
https://www.readbyqxmd.com/read/29703630/mid-to-long-term-survivorship-of-oxidised-zirconium-total-knee-replacements-performed-in-patients-under-50years-of-age
#10
Alexander W Glover, Alasdair J A Santini, John S Davidson, Jill A Pope
BACKGROUND: Oxidised zirconium has the wear properties of ceramic with the breakage resistance of metal. This results in less wear and is of benefit to younger, higher demand patients. We report the short- to mid-term survival of 103 Profix zirconium total knee replacements performed in patients under 50years of age at time of surgery. METHODS: Data was collected prospectively and survival analysis undertaken with strict end points used. SF (Short Form) 12 and WOMAC (Western Ontario and McMaster University) scores were recorded at pre-operatively and at twelve months, one, three, five, seven and ten years...
April 24, 2018: Knee
https://www.readbyqxmd.com/read/29699841/lateral-meniscus-allograft-transplantation-with-platelet-rich-plasma-injections-a-minimum-two-year-follow-up-study
#11
Hua Zhang, Shiyang Chen, Man Qiu, Aiguo Zhou, Wenlong Yan, Jian Zhang
BACKGROUND: The aim of this study was to report the short-term clinical and imaging outcomes of lateral meniscus allograft transplantations (LMAT) combined with intra-articular platelet-rich plasma (PRP) injection. METHODS: Thirty-three patients who had undergone LMAT combined with intra-articular PRP injection were evaluated. The Lysholm, International Knee Documentation Committee (IKDC), Western Ontario and McMaster Universities Osteoarthritis Index, Tegner activity level scale and visual analog scale for pain scores were used to evaluate the outcomes...
April 24, 2018: Knee
https://www.readbyqxmd.com/read/29685503/refractory-patellar-tendinopathy-treated-by-arthroscopic-decortication-of-the-inferior-patellar-pole-in-athletes-mid-term-outcomes
#12
Dhong Won Lee, Jin Goo Kim, Tae Min Kim, Du Han Kim
BACKGROUND: This study aimed to evaluate the clinical outcomes of arthroscopic decortication of the inferior patellar pole in athletes with refractory chronic patellar tendinopathy. METHODS: Thirty-seven athletes in whom conservative management for at least six months failed underwent arthroscopic patellar tendon debridement and decortication of the inferior pole of the patella. Clinical outcomes were evaluated using subjective knee scores and isokinetic muscle strength tests...
April 20, 2018: Knee
https://www.readbyqxmd.com/read/29685502/effects-of-pre-operative-knee-laxity-on-clinical-outcomes-after-partial-anterior-cruciate-ligament-reconstruction
#13
Bin Li, Guang-Bin Wang, Yan-Fang Wang, Bing-Zheng Zhou
BACKGROUND: The effects of retaining residual bundles on surgical outcomes has not been observed, so we evaluated the effects of preoperative knee laxity on clinical outcomes after partial anterior cruciate ligament (ACL) reconstruction for partial ACL rupture in this study. PURPOSE: To evaluate the effects of preoperative knee laxity on clinical outcomes after partial anterior cruciate ligament (ACL) reconstruction for partial ACL rupture. METHODS: The data of 47 patients, who had partial ACL rupture and underwent partial ACL reconstruction, were retrospectively analyzed...
April 20, 2018: Knee
https://www.readbyqxmd.com/read/29685501/effect-of-femoral-component-position-on-biomechanical-outcomes-of-unicompartmental-knee-arthroplasty
#14
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/29685500/evidence-of-generalised-mechanical-hyperalgesia-in-patients-with-advanced-knee-osteoarthritis-undergoing-total-knee-arthroplasty
#15
Khalid Jaber, Shaun O'Leary, Ashley Pedler, Michele Sterling, Michael McAuliffe
BACKGROUND AND OBJECTIVE: Persistent pain is reported in up to 34% of patients following total knee arthroplasty (TKA) for management of knee osteoarthritis (KOA). Persistent pain in this group is thought to be at least partly reflective of pain sensory hypersensitivity. The objective of this study was to evaluate sensory hypersensitivity, using mechanical and thermal quantitative sensory testing, in patients about to undergo TKA. DESIGN AND METHODS: Pressure pain thresholds (PPT) and cold pain thresholds (CPT) were recorded from 30 participants prior to their TKA, and compared with recordings taken from 30 healthy control participants of similar age and gender...
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
#16
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/29681529/variation-in-tibial-tuberosity-lateralization-and-distance-from-the-tibiofemoral-joint-line-an-anatomic-study
#17
John H Sojka, Joshua S Everhart, James C Kirven, Matthew D Beal, David C Flanigan
BACKGROUND: To describe variation in tibial tuberosity position in a normal adult population and inter-rater reliability of measurements of tibial tuberosity position. METHODS: Surface models of 161 proximal tibia specimens (83 female, 78 male; 80 black, 81 white; age 28.7years, SD 7.5) were created with a three-dimensional laser scanner. Percent lateralization, tuberosity-eminence angle, and distance from joint surface were measured for each specimen. Variation in tuberosity position by sex, race, age, height, and BMI was calculated...
April 19, 2018: Knee
https://www.readbyqxmd.com/read/29681528/local-associations-between-knee-cartilage-t-1%C3%AF-and-t-2-relaxation-times-and-patellofemoral-joint-stress-during-walking-a-voxel-based-relaxometry-analysis
#18
Hsiang-Ling Teng, Valentina Pedoia, Thomas M Link, Sharmila Majumdar, Richard B Souza
BACKGROUND: This study aimed to utilize voxel-based relaxometry (VBR) to examine local correlations between patellofemoral joint (PFJ) stress during gait and PFJ cartilage relaxation times. METHODS: Eighty-three subjects with and without PFJ osteoarthritis (OA) underwent knee magnetic resonance (MR) images using fast spin-echo, T1ρ and T2 relaxation time sequences. Patellar and trochlear cartilage relaxation times were computed for each voxel. Peak PFJ stress was computed during the stance phase from three-dimensional gait analysis...
April 19, 2018: Knee
https://www.readbyqxmd.com/read/29681527/factors-affecting-the-incidence-and-management-of-fixed-flexion-deformity-in-total-knee-arthroplasty-a-systematic-review
#19
REVIEW
Vincent V G An, Corey J Scholes, Brett A Fritsch
PURPOSE: This study aimed to systematically review the literature and identify factors which would contribute to the intraoperative correction of FFD to frame a potential surgical algorithm or predictive model to guide intraoperative decision-making. METHODS: Electronic searches of six databases were undertaken in April 2016 according to the PRISMA guidelines, and the reference lists of studies searched. Quality of studies was assessed using the STROBE checklist, and the Downs and Black Scores...
April 19, 2018: Knee
https://www.readbyqxmd.com/read/29678367/a-biomechanical-evaluation-of-different-fixation-strategies-for-posterolateral-fragments-in-tibial-plateau-fractures-and-introduction-of-the-magic-screw
#20
Hui Sun, Qi-Fang He, Bin-Bin Zhang, Yi Zhu, Wei Zhang, Yi-Min Chai
BACKGROUND: Posterior plate fixation is biomechanically the strongest fixation method for posterolateral column fracture (PLCF) of the tibial plateau; however, there are inherent deficiencies and risks of a posterior approach. Thus, the 'magic screw' was proposed to enhance fixation stability of the lateral rafting plate used for PLCF. The purpose of this study was to re-examine and compare the stability of different fixation methods for PLCF. METHODS: Synthetic tibiae models were used to simulate posterolateral split fractures...
April 17, 2018: Knee
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