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https://www.readbyqxmd.com/read/29774599/deep-convolutional-neural-network-for-segmentation-of-knee-joint-anatomy
#1
Zhaoye Zhou, Gengyan Zhao, Richard Kijowski, Fang Liu
PURPOSE: To describe and evaluate a new segmentation method using deep convolutional neural network (CNN), 3D fully connected conditional random field (CRF), and 3D simplex deformable modeling to improve the efficiency and accuracy of knee joint tissue segmentation. METHODS: A segmentation pipeline was built by combining a semantic segmentation CNN, 3D fully connected CRF, and 3D simplex deformable modeling. A convolutional encoder-decoder network was designed as the core of the segmentation method to perform high resolution pixel-wise multi-class tissue classification for 12 different joint structures...
May 17, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29772995/bilateral-spontaneous-quadriceps-tendon-ruptures-after-staged-bilateral-total-knee-arthroplasties-a-case-report
#2
Marine Coste, Jared M Newman, Neil V Shah, Ahmed M Eldib, Preston W Grieco, Aditya V Maheshwari
Quadriceps tendon ruptures are rare complications of total knee arthroplasty (TKA) and may be associated with preexisting tendon degeneration, vascular injuries during surgery, damage to the quadriceps tendon with over resection of the patella, or incomplete healing after a particular surgical approach. Moreover, postoperative causes include tissue necrosis due to component malalignment, trauma, and infection. Patient factors such as chronic systemic diseases, medications, increased body weight, and sedentary lifestyle could also be responsible...
2018: Journal of Long-term Effects of Medical Implants
https://www.readbyqxmd.com/read/29748692/clinics-in-diagnostic-imaging-185
#3
Ying Xin Candice Leong, Poh Lye Paul See
A 20-year-old National Serviceman presented with left knee pain and swelling after training for his physical fitness test. Lateral knee radiography and magnetic resonance (MR) imaging showed patellar tendon-lateral femoral condyle friction syndrome (PT-LFCFS), on a background of patella alta and patellar malalignment. The patient was treated non-operatively with a course of physiotherapy and given advice on rest and activity modification. PT-LFCFS is a less well-recognised but important cause of anterior knee pain and represents an entity in a spectrum of disorders related to patellofemoral instability...
April 2018: Singapore Medical Journal
https://www.readbyqxmd.com/read/29728862/the-medial-patellofemoral-complex
#4
REVIEW
Alexander E Loeb, Miho J Tanaka
PURPOSE OF REVIEW: The purpose of this review is to describe the current understanding of the medial patellofemoral complex, including recent anatomic advances, evaluation of indications for reconstruction with concomitant pathology, and surgical reconstruction techniques. RECENT FINDINGS: Recent advances in our understanding of MPFC anatomy have found that there are fibers that insert onto the deep quadriceps tendon as well as the patella, thus earning the name "medial patellofemoral complex" to allow for the variability in its anatomy...
May 4, 2018: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/29728298/kinesio-taping-effects-with-different-directions-and-tensions-on-strength-and-range-of-movement-of-the-knee-a-randomized-controlled-trial
#5
Thiago Vilela Lemos, José Roberto de Souza Júnior, Maikon Gleibyson Rodrigues Dos Santos, Marlon Maia Noronha Rosa, Luiz Guilherme Cardoso da Silva, João Paulo Chieregato Matheus
OBJECTIVE: To evaluate the Kinesio Taping effects with different directions and tensions on the strength of rectus femoris and range of movement of the knee in healthy individuals, but with a muscle imbalance caused by exposure to a continuous vibration. METHODS: This is a randomized controlled trial. The subjects were randomly allocated into two groups: Group application of the Kinesio Taping using origin to insertion and Group application of the Kinesio Taping using insertion to origin...
April 14, 2018: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/29724252/synthetic-versus-autologous-reconstruction-syn-var-of-the-medial-patellofemoral-ligament-a-study-protocol-for-a-randomised-controlled-trial
#6
Adam Tucker, Sam McMahon, Bronwyn McArdle, Bridgeen Rutherford, Danny Acton
BACKGROUND: Recurrent patellar instability incidence is 5.8/100,000 population, and recurrent dislocations are reported in the range of 15-80%. Recurrent instability is multifactorial and can be associated with disorder of limb alignment, osseous development, congruity of the patella in the trochlea and soft tissue static and dynamic constraints. The multifactorial aetiology makes management challenging, and a lack studies in a heterogeneous population with robust clinical outcomes compounds this further...
May 3, 2018: Trials
https://www.readbyqxmd.com/read/29719010/fat-fracture-a-rare-cause-of-anterior-and-medial-knee-pain-in-a-professional-baseball-player
#7
Ronak M Patel, Lonnie Soloff, Jason Genin, Pamela Lund, Mark S Schickendantz
Blunt trauma to the anterior knee typically results in a contusion or fracture of the patella. Additionally, injury to the extensor mechanism may come from a partial or full disruption of the patellar or quadriceps tendon. A professional baseball player suffered an injury to his knee after he collided with an outfield wall. Acute swelling in the suprapatellar soft tissues concealed a palpable defect, which initially was suspected to be an injury to the quadriceps tendon. Magnetic resonance imaging of the knee revealed an intact extensor mechanism; moreover, a fracture of the subcutaneous fat anterior to the quadriceps tendon was evident and diagnosed as a fat fracture...
April 2018: American Journal of Orthopedics
https://www.readbyqxmd.com/read/29705749/quadriceps-tendon-autograft-for-arthroscopic-knee-ligament-reconstruction-use-it-now-use-it-often
#8
REVIEW
Andrew J Sheean, Volker Musahl, Harris S Slone, John W Xerogeanes, Danko Milinkovic, Christian Fink, Christian Hoser
Traditional bone-patellar tendon-bone and hamstring tendon ACL grafts are not without limitations. A growing body of anatomic, biomechanical and clinical data has demonstrated the utility of quadriceps tendon autograft in arthroscopic knee ligament reconstruction. The quadriceps tendon autograft provides a robust volume of tissue that can be reliably harvested, mitigating the likelihood of variably sized grafts and obviating the necessity of allograft augmentation. Modern, minimally invasive harvest techniques offer the advantages of low rates of donor site morbidity and residual extensor mechanism strength deficits...
April 28, 2018: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/29702719/evaluation-of-a-novel-degradable-synthetic-biomaterial-patch-for-augmentation-of-tendon-healing-in-a-large-animal-model
#9
Wayne K Gersoff, Chantelle C Bozynski, Cristi R Cook, Ferris M Pfeiffer, Keiichi Kuroki, James L Cook
Tendon injury is common in sports. The standard of care (SOC) for tendon repair is surgical treatment. However, restored tendons often lack complete strength and functionality, and surgical repair is often unsuccessful. This controlled laboratory study investigates the healing of an Artelon patch (AP)-augmented tendon versus tendon repair alone in a preclinical canine patellar tendon defect model. Full-thickness proximal and distal flap defects were created in the patella tendons of eight purpose-bred research mongrel dogs...
April 27, 2018: Journal of Knee Surgery
https://www.readbyqxmd.com/read/29685503/refractory-patellar-tendinopathy-treated-by-arthroscopic-decortication-of-the-inferior-patellar-pole-in-athletes-mid-term-outcomes
#10
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/29679209/quadriceps-tendon-autograft-medial-patellofemoral-ligament-reconstruction
#11
REVIEW
Christian Fink, Robert Steensen, Peter Gföller, Robert Lawton
PURPOSE: Critically evaluate the published literature related to quadriceps tendon (QT) medial patellofemoral ligament (MPFL) reconstruction. RECENT FINDINGS: Hamstring tendon (HT) MPFL reconstruction techniques have been shown to successfully restore patella stability, but complications including patella fracture are reported. Quadriceps tendon (QT) reconstruction techniques with an intact graft pedicle on the patella side have the advantage that patella bone tunnel drilling and fixation are no longer needed, reducing risk of patella fracture...
April 20, 2018: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/29679117/the-infrapatellar-fat-pad-is-a-dynamic-and-mobile-structure-which-deforms-during-knee-motion-and-has-proximal-extensions-which-wrap-around-the-patella
#12
Joanna M Stephen, Ran Sopher, Sebastian Tullie, Andrew A Amis, Simon Ball, Andy Williams
PURPOSE: The infrapatellar fat pad (IFP) is a common cause of knee pain and loss of knee flexion and extension. However, its anatomy and behavior are not consistently defined. METHODS: Thirty-six unpaired fresh frozen knees (median age 34 years, range 21-68) were dissected, and IFP attachments and volume measured. The rectus femoris was elevated, suprapatellar pouch opened and videos recorded looking inferiorly along the femoral shaft at the IFP as the knee was flexed...
April 20, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29658926/evaluation-of-stem-cell-therapies-in-a-bilateral-patellar-tendon-injury-model-in-rats
#13
John R Wagner, Takashi Taguchi, Jane Y Cho, Chandrashekhar Charavaryamath, Dominique J Griffon
Regenerative medicine provides novel alternatives to conditions that challenge traditional treatments. The prevalence and morbidity of tendinopathy across species, combined with the limited healing properties of this tissue, have prompted the search for cellular therapies and propelled the development of experimental models to study their efficacy. Umbilical cord matrix-derived mesenchymal stem cells (UCM-MSC) are appealing candidates because they are abundant, easy to collect, circumvent the ethical concerns and risk of teratoma formation, yet resemble primitive embryonic stem cells more closely than adult tissue-derived MSCs...
March 30, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29655901/in-vivo-heterotopic-culturing-of-prefabricated-tendon-grafts-with-mechanical-stimulation-in-a-sheep-model
#14
M Petri, P Lu, M Omar, M Ettinger, C Krettek, C Neunaber, M Jagodzinski
BACKGROUND: The goal of this study is to investigate the biomechanical and histological properties of in vivo heterotopically prefabricated cruciate ligament replacement grafts with and without mechanical stimulation. The clinical goal is to heterotopically prefabricate a bone-tendon-bone graft for anterior cruciate ligament reconstruction, which allows rapid ingrowth and early full weight bearing. METHODS: In a sheep model, eight quadriceps tendon grafts were harvested and introduced into culture chambers at their proximal and distal ends...
April 11, 2018: Knee
https://www.readbyqxmd.com/read/29644038/calcific-tendonitis-of-the-quadriceps-tendon
#15
S A Webb, M A Hopper, J Chitnavis
A 61-year-old woman presented with chronic anterior pain and stiffness in the distal left thigh. Examination revealed swelling and tenderness immediately proximal to the patella. Radiographs showed opacities in the distal anterior thigh whilst MRI identified enlargement of the distal quadriceps tendon with splayed fibres separated by solid conglomerates. Dystrophic calcification of the quadriceps tendon was diagnosed. Blood tests revealed no systemic abnormalities in calcium handling. Arthroscopy of the left knee identified calcific deposits in the supra-patella pouch with surrounding synovitis...
April 2018: Journal of Surgical Case Reports
https://www.readbyqxmd.com/read/29611007/femoral-tunnel-widening-is-associated-with-tunnel-malposition-but-not-with-clinical-failure-after-medial-patellofemoral-ligament-reconstruction-with-a-free-gracilis-tendon-graft
#16
Karl-Friedrich Schüttler, A Hoeger, T J Heyse, J Figiel, N Timmesfeld, T Stein, E Ziring, T Efe
INTRODUCTION: MPFL reconstruction is widely and successfully used for treating patella instability, either as a standalone procedure or in combination. Although different techniques allow for MPFL reconstruction, the use of a free tendon graft is one of the most commonly used. The phenomenon of tunnel widening or tunnel enlargement is well described in ACL reconstruction, but so far only little effort has been put into evaluating this phenomenon after MPFL reconstruction. MATERIALS AND METHODS: Patients who received an MPFL reconstruction with a free gracilis tendon graft were identified by review of patient files...
April 2, 2018: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29560510/flexing-and-downsizing-the-femoral-component-is-not-detrimental-to-patellofemoral-biomechanics-in-posterior-referencing-cruciate-retaining-total-knee-arthroplasty
#17
Marco A Marra, Marta Strzelczak, Petra J C Heesterbeek, Sebastiaan A W van de Groes, Dennis Janssen, Bart F J M Koopman, Nico Verdonschot, Ate B Wymenga
PURPOSE: When downsizing the femoral component to prevent mediolateral overhang, notching of the anterior femoral cortex may occur, which could be solved by flexing the femoral component. In this study, we investigated the effect of flexion of the femoral component on patellar tendon moment arm, patellofemoral forces and kinematics in posterior-referencing CR-TKA. Our hypothesis was that flexion of the femoral component increases the patellar tendon moment arm, reduces the patellofemoral forces and provides stable kinematics...
March 20, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29548734/the-patella-a-mechanical-determinant-of-coordination-during-vertical-jumping
#18
Daniel John Cleather
The patella is traditionally understood to be a "joint spacer" that increases the moment arm of the patellar tendon. This characterisation is unsatisfactory as it fails to explain the more interesting characteristics of the patella: 1) that the changing pivot point of the patella causes the ratio of quadriceps to patellar tendon force to almost double as the knee flexes; 2) that the patellar tendon exerts an anteriorly directed force on the tibia when the knee is extended but this switches to a posterior draw as the knee flexes; and 3) that the presence of the patella allows the quadriceps to exert different moments on the femur and tibia...
March 13, 2018: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/29547136/ultrasound-assessment-of-enthesis-thickness-in-psoriasis-and-psoriatic-arthritis-a-cross-sectional-study
#19
Dario Graceffa, Claudio Bonifati, Viviana Lora, Pier Luigi Saraceni, Catia De Felice, Maria Sole Chimenti, Roberto Perricone, Aldo Morrone
BACKGROUND: The inflammatory involvement of the enthesis in the course of psoriasis is accompanied by structural abnormalities detectable by ultrasound. The most common of these abnormalities is the thickening of the tendon at the insertion site. AIMS: The aim of the present study was to compare the thickness of entheses of patients with psoriatic arthritis, only skin psoriasis, and healthy controls. METHODS: A cross-sectional study was conducted in a cohort of patients affected with either only skin psoriasis or psoriatic arthritis as well as in a control group...
March 16, 2018: Indian Journal of Dermatology, Venereology and Leprology
https://www.readbyqxmd.com/read/29546510/the-quadriceps-active-ratio-a-dynamic-mri-based-assessment-of-patellar-height
#20
Sergio Barroso Rosa, Zaid Bahho, Kenji Doma, Kaushik Hazratwala, Peter McEwen, Varaguna Manoharan, Brent Matthews, Matthew Wilkinson
INTRODUCTION: Patella alta (PA) is one of the primary correctable risk factors for patellofemoral instability (PFI). Both an accurate diagnosis of PA and a clinically relevant target for correction are necessary for optimal treatment. An ideal test for PA should relate the position of the patella to the femur rather than tibia, should do so with the quadriceps contracted and the patellar tendon under tension and should have good sensitivity and specificity. None of the currently used radiographic tests PA meet these criteria, most of which are based on the position of the patella relative to the tibia with diagnostic cutoffs based on 2 standard deviations from the mean rather than optimal sensitivity and specificity...
March 15, 2018: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
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