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https://www.readbyqxmd.com/read/28532997/the-influence-of-varus-and-valgus-deviation-on-patellar-kinematics-in-healthy-knees-an-exploratory-cadaver-study
#1
Michael Worlicek, Benedikt Moser, Günther Maderbacher, Raphael Zentner, Florian Zeman, Joachim Grifka, Armin Keshmiri
BACKGROUND: Patellofemoral instability may lead to osteoarthritis, anterior knee pain, and patellar luxation. The purpose of this study was to conduct an exploratory investigation into the difference of patellar kinematics of healthy knees during extension/flexion cycles in neutral, varus and valgus alignment. METHODS: The three-dimensional patellar kinematics of 10 lower extremities of whole body cadavers were examined during passive motion, in neutral position, and under valgus and varus stress...
May 19, 2017: Knee
https://www.readbyqxmd.com/read/28530482/the-effect-of-backpack-load-carriage-on-the-kinetics-and-kinematics-of-ankle-and-knee-joints-during-uphill-walking
#2
Jinkyu Lee, Yong-Jin Yoon, Choongsoo S Shin
The purpose of this study was to investigate the effect of load carriage on the kinematics and kinetics of the ankle and knee joints during uphill walking, including joint work, range of motion (ROM), and stance time. Fourteen males walked at a self-selected speed on an uphill (15°) slope wearing military boots and carrying a rifle in hand without a backpack (control condition) and with a backpack. The results showed that the stance time significantly decreased with backpack carriage (p<.05). The mediolateral impulse significantly increased with backpack carriage (p<...
May 22, 2017: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/28514128/-treatment-for-osteoarthritis-of-the-knee
#3
REVIEW
Uriel Giwnewer, Guy Rubin, Hagay Orbach, Nimrod Rozen
Osteoarthritis is the most common joint disorder in the world and its incidence is rising. In Western populations it is one of the most frequent causes of pain, loss of function and disability in adults. The estimated lifetime risk for knee osteoarthritis is approximately 40% in men and 47% in women. The diagnosis of osteoarthritis is complex due to a lack of specific physical and/or laboratorial findings. The American College of Rheumatology (ACR) has recommended using the following criteria for the diagnosis of knee osteoarthritis: chronic knee pain (lasting for more than 6 weeks) and at least three of the following: • Age over 50 years old...
July 2016: Harefuah
https://www.readbyqxmd.com/read/28513405/-a-football-player-with-an-evident-knee-trauma
#4
W A Goudriaan, R Huis In 't Veld, R A G Hoogeslag
A 22-year-old male presented with medial sided instability of the right knee three days after shooting a blocked ball. Physical examination, which is usually feasible in the acute phase, showed grade 3 laxity of the superficial medial collateral ligament. MRI confirmed a distal rupture, which needs repair within 2 weeks after onset.
2017: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/28511363/solving-the-mystery-of-the-antero-lateral-ligament
#5
P H Sonia Farhan, Rathi Sudhakaran, Jai Thilak
INTRODUCTION: The cruciate ligaments are essential for the antero-posterior stability of the knee joint. In Anterior Cruciate Ligament (ACL) rupture, though reconstructive surgery is a widely accepted and proven procedure, there is still an unacceptably high re-injury rate. The fact that the rotational instability persists even after the surgical reconstruction of ACL injury has evoked a new interest in the study of the soft tissue structures on the anterolateral aspect of the knee joint...
March 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28510474/increased-magnetic-resonance-imaging-signal-of-the-lateral-patellar-facet-cartilage-a-functional-marker-for-patellar-instability
#6
Anna L Falkowski, Carlo Camathias, Jon A Jacobson, Olaf Magerkurth
BACKGROUND: In the knee joint, predisposition for patellar instability can be assessed by an abnormal Insall-Salvati index, tibial tuberosity-trochlear groove (TTTG) distance, and abnormal shape of patella and trochlea. Given the complex anatomic features of the knee joint with varying positions of the patella during motion, the presence of a single or even a combination of these factors does not inevitably result in patellar instability. After trocheoplasty in patients with trochlear dysplasia, assessment of trochlear cartilage and subchondral bone is limited due to postoperative artifacts...
May 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28508959/surgical-treatment-of-patellar-instability-clinical-and-radiological-outcome-after-medial-patellofemoral-ligament-reconstruction-and-tibial-tuberosity-medialisation
#7
Stefan Lobner, Christine Krauss, Frank Reichwein, Thilo Patzer, Wolfgang Nebelung, Arne J Venjakob
INTRODUCTION: The aim of this retrospective study was to analyse clinical and radiological outcome after medial patellofemoral ligament reconstruction (MPFLR) and tibial tuberosity medialisation (TTM) in patients with recurrent patellar instability. MATERIALS AND METHODS: Thirty-five patients were included between 2008 and 2012. According to defined criteria such as tibial tuberosity-trochlear groove (TTTG) distance, hyperpression on the lateral patella facet and lateral retropatellar cartilage damage either MPFLR (group A) or TTM (group B) was performed: 18 patients underwent TTM, the other 17 patients underwent MPFLR...
May 16, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28502536/results-of-a-modular-revision-system-in-total-knee-arthroplasty
#8
David A Crawford, Keith R Berend, Michael J Morris, Joanne B Adams, Adolph V Lombardi
BACKGROUND: Revision total knee arthroplasty (TKA) poses unique challenges compared with primary TKA such as bone loss, deformity, and ligament instability. Modular component options allow flexibility to deal with these complexities. The purpose of this study was to evaluate midterm outcomes for revision TKA using a modular revision knee system with complete interchangeability and multiple options for augmentation, offset, constraint, and stem extensions. METHODS: A query of our practice registry revealed 257 consented patients (274 knees and 278 TKA) with minimum 2-year follow-up who underwent aseptic revision TKA with a modular system (Vanguard Super Stabilized Knee; Zimmer Biomet, Warsaw, IN) between 2005 and 2013...
April 10, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28493217/what-is-the-mid-term-failure-rate-of-revision-acl-reconstruction-a-systematic-review
#9
Alberto Grassi, Christopher Kim, Giulio Maria Marcheggiani Muccioli, Stefano Zaffagnini, Annunziato Amendola
BACKGROUND: When anterior cruciate ligament (ACL) reconstruction fails, a revision procedure may be performed to improve knee function, correct instability, and allow return to activities. The results of revision ACL reconstruction have been reported to produce good but inferior patient-reported and objective outcomes compared with primary ACL reconstruction, but the degree to which this is the case varies widely among published studies and may be influenced by heterogeneity of patients, techniques, and endpoints assessed...
May 10, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28484791/varus-femoral-and-tibial-coronal-alignments-result-in-different-kinematics-and-kinetics-after-total-knee-arthroplasty
#10
Mutsumi Watanabe, Shinichi Kuriyama, Shinichiro Nakamura, Yoshihisa Tanaka, Kohei Nishitani, Moritoshi Furu, Hiromu Ito, Shuichi Matsuda
PURPOSE: Abnormal knee motion under various conditions has been described after total knee arthroplasty (TKA). However, differences in kinematics and kinetics of knees with varus femoral versus varus tibial alignment have not been evaluated. It was hypothesized that varus femoral and tibial alignments have the same impact on knee motion. METHODS: A musculoskeletal computer simulation was used. Femoral and tibial alignment in the coronal plane was each varied from neutral to 5° of varus in 1° increments...
May 8, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28484790/lateral-meniscus-posterior-root-tear-contributes-to-anterolateral-rotational-instability-and-meniscus-extrusion-in-anterior-cruciate-ligament-injured-patients
#11
Takao Minami, Takeshi Muneta, Ichiro Sekiya, Toshifumi Watanabe, Tomoyuki Mochizuki, Masafumi Horie, Hiroki Katagiri, Koji Otabe, Toshiyuki Ohara, Mai Katakura, Hideyuki Koga
PURPOSE: The purposes of this study were to investigate (1) meniscus status and clinical findings in anterior cruciate ligament (ACL)-injured patients to clarify associations between the meniscus posterior root tear (PRT) and knee instability, and (2) magnetic resonance imaging (MRI) findings of the PRT to clarify sensitivity and specificity of MRI and prevalence of meniscus extrusion. METHODS: Three hundred and seventeen patients with primary ACL reconstruction were included...
May 8, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28473957/syndesmotic-internalbrace-tm-for-anatomic-distal-tibiofibular-ligament-augmentation
#12
Markus Regauer, Gordon Mackay, Mirjam Lange, Christian Kammerlander, Wolfgang Böcker
Reconstruction of unstable syndesmotic injuries is not trivial, and there is no generally accepted treatment guidelines. Thus, there still remain considerable controversies regarding diagnosis, classification and treatment of syndesmotic injuries. Syndesmotic malreduction is the most common indication for early re-operation after ankle fracture surgery, and widening of the ankle mortise by only 1 mm decreases the contact area of the tibiotalar joint by 42%. Outcome of ankle fractures with syndesmosis injury is worse than without, even after surgical syndesmotic stabilization...
April 18, 2017: World Journal of Orthopedics
https://www.readbyqxmd.com/read/28464756/increased-risk-of-early-and-medium-term-revision-after-post-fracture-total-knee-arthroplasty
#13
Anders El-Galaly, Steffen Haldrup, Alma Becic Pedersen, Andreas Kappel, Michael Ulrich Jensen, Poul Torben Nielsen
Background and purpose - Total knee arthroplasty (TKA) due to posttraumatic fracture osteoarthritis (PTFA) may be associated with inferior prosthesis survival. This study is the first registry-based study solely addressing this issue. Both indications and predictors for revision were identified. Patients and methods - 52,518 primary TKAs performed between 1997 and 2013 were retrieved from the Danish Knee Arthroplasty Register (DKR). 1,421 TKAs were inserted due to PTFA and 51,097 due to primary osteoarthritis (OA)...
June 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28462798/no-associations-between-self-reported-knee-joint-instability-and-radiographic-features-in-knee-osteoarthritis-patients-prior-to-total-knee-arthroplasty-a-cross-sectional-analysis-of-the-longitudinal-leiden-orthopaedics-outcomes-of-osteo-arthritis-study-loas
#14
Claudia S Leichtenberg, Jorit J L Meesters, Herman M Kroon, Suzan H M Verdegaal, Claire Tilbury, Joost Dekker, Rob G H H Nelissen, Thea P M Vliet Vlieland, Martin van der Esch
BACKGROUND: To describe the prevalence of self-reported knee joint instability in patients with pre-surgery knee osteoarthritis (OA) and to explore the associations between self-reported knee joint instability and radiological features. METHODS: A cross-sectional study including patients scheduled for primary Total Knee Arthroplasty (TKA). Self-reported knee instability was examined by questionnaire. Radiological features consisted of osteophyte formation and joint space narrowing (JSN), both scored on a 0 to three scale...
April 24, 2017: Knee
https://www.readbyqxmd.com/read/28462215/condylar-constrained-system-in-primary-total-knee-replacement-our-experience-and-literature-review
#15
Luigi Sabatini, Salvatore Risitano, Lorenzo Rissolio, Andrea Bonani, Francesco Atzori, Alessandro Massè
BACKGROUND: Constrained condylar knee (CCK) prosthesis are common used for revision surgery but can also help surgeons to improve implant stability in primary knee arthroplasty, in fact in severe knee arthrosis with serious deformity associated with a significant instability a more constrained articulation is required. With introduction of second generation of semi-constrained prosthesis, rate of complication is real decreased and a good survival rate and functional score results is showed...
March 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28459747/biomechanical-analysis-of-tibial-tuberosity-medialization-and-medial-patellofemoral-ligament-reconstruction
#16
John J Elias, Bradley W Smith, Blake T Daney
Biomechanical studies are commonly performed to evaluate the influence of medial patellofemoral ligament (MPFL) reconstruction and tibial tuberosity medialization on patellar tracking and patellofemoral contact pressures. The most common method is in vitro simulation of knee function, but computational simulation of knee function and computational reconstruction of in vivo motion can also be utilized. The current review of the biomechanical literature indicates that MPFL reconstruction and tibial tuberosity medialization reduce lateral patellar tracking...
June 2017: Sports Medicine and Arthroscopy Review
https://www.readbyqxmd.com/read/28455474/contemporary-failure-aetiologies-of-the-primary-posterior-stabilised-total-knee-arthroplasty
#17
M P Abdel, C K Ledford, A Kobic, M J Taunton, A D Hanssen
AIMS: The number of revision total knee arthroplasties (TKA) that are performed is expected to increase. However, previous reports of the causes of failure after TKA are limited in that they report the causes at specific institutions, which are often dependent on referral patterns. Our aim was to report the most common indications for re-operations and revisions in a large series of posterior-stabilised TKAs undertaken at a single institution, excluding referrals from elsewhere, which may bias the causes of failure...
May 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28451863/variations-in-knee-kinematics-after-acl-injury-and-after-reconstruction-are-correlated-with-bone-shape-differences
#18
Drew A Lansdown, Valentina Pedoia, Musa Zaid, Keiko Amano, Richard B Souza, Xiaojuan Li, C Benjamin Ma
BACKGROUND: The factors that contribute to the abnormal knee kinematics after anterior cruciate ligament (ACL) injury and ACL reconstruction remain unclear. Bone shape has been implicated in the development of hip and knee osteoarthritis, although there is little knowledge about the effects of bone shape on knee kinematics after ACL injury and after ACL reconstruction. QUESTIONS/QUESTIONS: (1) What is the relationship between bony morphology with alterations in knee kinematics after ACL injury? (2) Are baseline bone shape features related to abnormal knee kinematics at 12 months after ACL reconstruction? METHODS: Thirty-eight patients (29 ± 8 years, 21 men) were prospectively followed after acute ACL injury and before ligamentous reconstruction...
April 27, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28451605/the-impact-of-osseous-malalignment-and-realignment-procedures-in-knee-ligament-surgery-a-systematic-review-of-the-clinical-evidence
#19
REVIEW
Thomas Tischer, Jochen Paul, Dietrich Pape, Michael T Hirschmann, Andreas B Imhoff, Stefan Hinterwimmer, Matthias J Feucht
BACKGROUND: Failure rates of knee ligament surgery may be high, and the impact of osseous alignment on surgical outcome remains controversial. Basic science studies have demonstrated that osseous malalignment can negatively affect ligament strain and that realignment procedures may improve knee joint stability. HYPOTHESIS/PURPOSE: The purpose of this review was to summarize the clinical evidence concerning the impact of osseous malalignment and realignment procedures in knee ligament surgery...
March 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28451595/medial-patellofemoral-ligament-repair-versus-reconstruction-for-recurrent-patellar-instability-two-year-results-of-an-algorithm-based-approach
#20
Jason L Dragoo, Michael Nguyen, Corey T Gatewood, Jacob D Taunton, Simon Young
BACKGROUND: Patellar instability remains a challenging problem for both the patient and surgeon. Medial patellofemoral ligament (MPFL) repair has historically had poor results, and due to this, there is currently a trend toward reconstruction. PURPOSE/HYPOTHESIS: This study was undertaken to investigate experience with repair versus reconstruction of the MPFL using a multifactorial treatment algorithm approach. Our hypothesis was that there will be no significant difference in outcome scores between patients in the MPFL repair and reconstruction groups...
March 2017: Orthopaedic Journal of Sports Medicine
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