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J B Seeger, J P Schikschneit, C Schuld, R Rupp, M Rickert, A Jahnke, G S Maier, M Clarius
BACKGROUND: Unicompartmental knee arthroplasty (UKA) is an effective treatment for patients with medial osteoarthritis of the knee joint. Instrumented gait analysis provides an objective measure to quantify and qualify postoperative changes of gait. The purpose of this study was to evaluate standardized instrumented gait analysis for functional recovery and gait as an outcome of mobile-bearing UKA in patients with medial osteoarthritis of the knee. METHODS: Twenty-one patients with isolated medial osteoarthritis of the knee joint received mobile-bearing UKA...
March 15, 2018: Knee
Hans-Peter W van Jonbergen, Robin E Westerbeek
BACKGROUND: Clinical outcomes in patellofemoral joint replacement may be related to femoral component rotation. Assessment of rotational alignment is however difficult as patients with isolated patellofemoral osteoarthritis often have trochlear dysplasia. The use of the medial malleolus as a landmark to guide rotation has been suggested. The purpose of our study was to evaluate this technique with regard to femoral component rotation, and to correlate rotation with clinical outcomes at one-year follow-up...
March 15, 2018: Knee
William Craddock, Troy Smithers, Craig Harris, William du Moulin, Robert Molnar
BACKGROUND: Posterior cruciate ligament (PCL) injuries of the knee are common and sometimes difficult to diagnose. Magnetic resonance imaging (MRI), performed using standard orthogonal plane views, is the investigation of choice. It can be particularly difficult to differentiate acute partial and complete tears and identify elongation of chronic healed tears. The aim of the paper is to describe a new method of positioning the patient with the knee flexed at 90°, allowing the PCL to be visualised in a position of greatest length and tension which may assist in differentiating and identifying these injuries...
March 14, 2018: Knee
Du Hyun Ro, Hyuk-Soo Han, Seong Hwan Kim, Yoon-Ho Kwak, Jae-Young Park, Myung Chul Lee
BACKGROUND: The goals of this study were (1) to document the gait pattern of patients with unilateral knee osteoarthritis (OA), (2) to determine the knee adduction moment (KAM) changes in the non-operated knee, and (3) to identify the predictors of change in KAM in the non-operated knee. METHODS: The study recruited 23 patients with advanced unilateral knee OA. The preoperative Kellgren-Lawrence (KL) grade of the non-operated knee was one or two; non-operated knee pain, rated using a numeric rating scale (NRS), was less than three out of 10 points...
March 13, 2018: Knee
John J Elias, Kerwyn C Jones, S Cyrus Rezvanifar, Joseph N Gabra, Melanie A Morscher, Andrew J Cosgarea
BACKGROUND: Continued patellar instability can occur following medial patellofemoral ligament (MPFL) reconstruction. Computational simulation of function was used to investigate the influence of the lateral position of the tibial tuberosity, trochlear dysplasia and patella alta on lateral patellar tracking following MPFL reconstruction. METHODS: Multibody dynamic simulation models were developed to represent nine knees being treated for recurrent patellar instability...
March 12, 2018: Knee
Maurik H M van Haagen, Hennie Verburg, Brechtje Hesseling, Lauri Coors, Nick T van Dasselaar, Pim N J Langendijk, Nina M C Mathijssen
No abstract text is available yet for this article.
March 10, 2018: Knee
Simon W Young, Mustafa Saffi, Mark J Spangehl, Henry D Clarke
BACKGROUND: Malrotation of tibial and femoral components is a potential source of pain following total knee arthroplasty (TKA). This study aimed to 1) compare component rotation in TKA patients with unexplained pain versus a control group with well-functioning TKAs and 2) investigate the relationship between TKA component rotation and pain. METHODS: Seventy one patients with unexplained pain after primary TKA were compared to a control cohort of 41 well functioning TKA patients...
March 8, 2018: Knee
Himabindu Mikkilineni, Patricia B Delzell, Jack Andrish, Jennifer Bullen, Nancy A Obuchowski, Naveen Subhas, Joshua M Polster, Jean P Schils
BACKGROUND: We sought to determine whether there are ultrasound parameters that differ between knees with symptomatic fat pad synovial impingement and asymptomatic knees. METHODS: A prospective study was performed in patients with clinical signs and symptoms of fat pad synovial impingement and asymptomatic controls. Eleven symptomatic knees and 10 asymptomatic controls were evaluated. Ultrasound imaging was performed before and after exercise. Evaluated parameters included largest fat lobule compressibility, subjective assessment of vascularity, largest vessel diameter, and subjective assessment of dynamic fat pad motion during flexion and extension...
March 7, 2018: Knee
Jin-Hyuck Lee, Jae-Won Heo, Dae-Hee Lee
BACKGROUND: Types of mechanoreceptors may differ between the medial and lateral menisci, suggesting that postural stability may differ between patients with medial and lateral meniscus tears. However, to date, postural stability has not been compared in patients with medial and lateral meniscus tears. This study used stabilometry to compare postural stability in patients with medial and lateral meniscus tears. METHODS: Postural stability and thigh muscle strength were assessed in 24 patients with medial and 18 patients with lateral meniscus tears...
March 7, 2018: Knee
Kim Hébert-Losier, Lina Schelin, Eva Tengman, Andrew Strong, Charlotte K Häger
BACKGROUND: Anterior cruciate ligament (ACL) ruptures may lead to knee dysfunctions later in life. Single-leg tasks are often evaluated, but bilateral movements may also be compromised. Our aim was to use curve analyses to examine double-leg drop-jump kinematics in ACL-reconstructed, ACL-deficient, and healthy-knee cohorts. METHODS: Subjects with unilateral ACL ruptures treated more than two decades ago (17-28years) conservatively with physiotherapy (ACLPT , n=26) or in combination with reconstructive surgery (ACLR , n=28) and healthy-knee controls (n=25) performed 40-cm drop-jumps...
March 7, 2018: Knee
Hyuk-Soo Han, Seung-Baik Kang
BACKGROUND: This work aimed to evaluate the changes in the femoral posterior condylar offset (PCO) and tibial slope after posterior cruciate ligament (PCL)-substituting total knee arthroplasty (TKA), and to address the presence of any interactive effect between the two on knee flexion. METHODS: Fifty-two PCL-substituting TKAs were performed using a posterior referencing system. Three-dimensional reconstructed computed tomographic (CT) images were used to evaluate PCO and tibial slope before and after arthroplasty...
March 7, 2018: Knee
Nicholas Greco, Keith Berend
The case of an atraumatic dislocation of a fixed bearing in a medial unicompartmental arthroplasty with an oxinium femoral component is presented. A review of the literature pertaining to knee arthroplasty locking mechanisms is discussed. Potential modes of locking mechanisms failure are reviewed including the recognition of such failures in the clinical setting. This is the first report of a dislocated fixed-bearing medial oxinium unicompartmental arthroplasty and consequent metal arthrogram.
March 7, 2018: Knee
Hope C Davis, Jeffery T Spang, Richard F Loeser, Staffan Larsson, Veronica Ulici, J Troy Blackburn, R Alexander Creighton, Ganesh M Kamath, Joanne M Jordan, Stephen W Marshall, Brian Pietrosimone
BACKGROUND: To determine the association between time from injury to ACL reconstruction (TimeInjury-ACLR ) and biochemical markers of cartilage metabolism and inflammation six months following ACL reconstruction (ACLR). METHODS: Individuals with a unilateral ACL injury were enrolled at initial presentation in the orthopedic clinic; blood was collected six months following ACLR. Enzyme-linked immunosorbent assays were used to analyze the ratio of serum concentrations of type-II collagen breakdown (C2C) to synthesis (CPII), plasma matrix metalloproteinase-3 (MMP-3), interleukin-6 (IL-6), and serum aggrecan neoepitope (ARGS)...
March 7, 2018: Knee
G Sheridan, E Wisken, C B Hing, T O Smith
BACKGROUND: Evidence-based practice is a foundation to clinical excellence. However there remains little evidence on the characteristics of authors who contribute to the evidence-base and whether these have changed over time. The purpose of this study was to explore these characteristics by undertaking a bibliometric analysis to explore publication and authorship characteristics in a leading sub-speciality orthopaedic journal (The Knee) over a 20-year period. METHODS: All articles published in The Knee in 1996, 2006 and 2016 were identified...
March 5, 2018: Knee
B H van Duren, H Pandit, P Pechon, A Hart, D W Murray
BACKGROUND: Many different measures have been used to describe knee kinematics. This study investigated the changes of two measures, the patellar tendon angle and the patellar flexion angle, in response to variations in the geometry of the knee due to surgical technique or implant design. METHODS: A mathematical model was developed to calculate the equilibrium position of the extensor mechanism for a particular tibiofemoral position. Calculating the position of the extensor mechanism allowed for the determination of the patellar tendon angle and patellar flexion angle relationships to the knee flexion angle...
February 28, 2018: Knee
Erik Schiffner, David Latz, Jan P Grassmann, Alberto Schek, Simon Thelen, Joachim Windolf, Johannes Schneppendahl, Pascal Jungbluth
BACKGROUND: Anterior cruciate ligament ruptures (ACLRs) are severe sports-related injuries with significant consequences for affected players and teams. This study aims to identify the epidemiology and injury-related lay-off after ACLR in professional male soccer players from the first-division German Bundesliga. METHODS: Exposure times and incidence of anterior cruciate ligament ruptures were collected during 7.5 consecutive seasons using two media-based registers...
February 22, 2018: Knee
S W F Middleton, A D Toms, P J Schranz, V I Mandalia
BACKGROUND: We present the largest series of Avon patellofemoral joint (PFJ) replacements outside of the design centre. There is discussion over its efficacy and usefulness. We report an independent opinion of its indications, survivorship and outcomes. METHODS: We prospectively collected demographic data and patient reported outcome measures (PROM's) on our cohort of Avon Patellofemoral replacements since its adoption in our unit in 2003 until 2014. We performed a retrospective review of radiographs...
February 20, 2018: Knee
Stephen H White, Sharon Roberts, Jan Herman Kuiper
BACKGROUND: A multicentre study of single peg Oxford knees reported failure associated with osteoarthritis progression, femoral component loosening, unexplained pain and meniscal bearing dislocation. Suboptimally positioned femoral components and intraoperative MCL damage could explain these problems. We hypothesised that modifying implantation technique to optimise femoral component positioning and MCL preservation, and introducing the twin peg Oxford knee would address these problems and improve longer term survival...
January 30, 2018: Knee
Jigar Chhapan, Sukesh Rao Sankineani, T Chiranjeevi, Maryada V Reddy, Diwakar Reddy, A V Gurava Reddy
BACKGROUND: Extensor mechanism disruption following total knee arthroplasty (TKA) is a rare complication and results in significant morbidity and severe functional limitation. Quadriceps tendon rupture in the early postoperative period after TKA is one of them, of which there is a significant paucity of available information. METHODS: In this retrospective study of 2404 patients who underwent primary TKA between June 2015 to May 2016, there were 10 quadriceps tendon ruptures in seven patients (three bilateral, four unilateral) presented within three months after surgery...
January 30, 2018: Knee
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