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https://www.readbyqxmd.com/read/27905071/imaging-of-patellar-fractures
#1
REVIEW
Mohamed Jarraya, Luis E Diaz, William F Arndt, Frank W Roemer, Ali Guermazi
Patellar fractures account for approximately 1% of all skeletal fractures and may result from direct, indirect, or combined trauma. Because of the importance of patellar integrity for knee extension and the risk of associated injury to the extensor mechanism, accurate reporting and description of fracture type is paramount for appropriate management. This pictorial essay aims to review the normal anatomy of the patella, the mechanisms of injury and different types of patellar fractures, with a brief introduction to therapeutic management...
November 30, 2016: Insights Into Imaging
https://www.readbyqxmd.com/read/27904790/current-concepts-in-the-treatment-of-gross-patellofemoral-instability
#2
Grant Buchanan, LeeAnne Torres, Brian Czarkowski, Charles E Giangarra
: Patellofemoral instability is a painful and commonly recurring condition, which often must be managed surgically. Diagnosis can be aided by the use of a variety of physical exam signs, such as the Q angle, Beighton hypermobility score, glide test, J sign, patellar tilt test, and apprehension test. Imaging modalities including x-ray, CT, and MRI guide both diagnosis and management by revealing trochlear dysplasia, bony malalignment, and ligamentous injury that contribute to instability...
December 2016: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/27904787/biomechanics-and-pathomechanics-of-the-patellofemoral-joint
#3
Janice K Loudon
The patellofemoral joint is a joint that can be an area of concern for athletes of various sports and ages. The joint is somewhat complex with multiple contact points and numerous tissues that attach to the patella. Joint forces are variable and depend on the degree of knee flexion and whether the foot is in contact with the ground. The sports medicine specialist must have a good working knowledge of the anatomy and biomechanics of the patellofemoral joint in order to treat it effectively.
December 2016: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/27902174/total-patellectomy-for-patellar-aneurysmal-bone-cyst
#4
Mehmet Çetinkaya, Hamza Özer, Hakan Y Selek, Selim Erekul
Herein we report a case of patellar aneurysmal bone cyst of a 32-year-old female patient who was admitted to our outpatient clinic due to the swelling on her left knee. She was describing no trauma history but increasing pain and that the mass was expanding gradually by the time. Although it occurs rarely in patella, evaluation by radiographic and magnetic resonance images revealed that the mass was due to the patellar aneurysmal bone cyst, which also destructed the surface of the joint. Although there was no impairment in the range of motion of the patient's left knee in the preoperative evaluation, because of the destruction, we performed total patellectomy and extensor mechanism reconstruction by Zaricznyj technique instead of curettage and grafting...
December 2016: Eklem Hastalıkları Ve Cerrahisi, Joint Diseases & related Surgery
https://www.readbyqxmd.com/read/27900510/does-a-positioning-rod-or-a-patient-specific-guide-result-in-more-natural-femoral-flexion-in-the-concept-of-kinematically-aligned-total-knee-arthroplasty
#5
Max Ettinger, Tilman Calliess, Stephen M Howell
PURPOSE: Flexion of the femoral component in 5° increments downsizes the femoral component, decreases the proximal reach and surface area of the trochlea, delays the engagement of the patella during flexion, and is associated with a higher risk of patellar-femoral instability after kinematically aligned TKA. The present study evaluated flexion of the femoral component after use of two kinematic alignment instrumentation systems. We determined whether a distal cutting block attached to a positioning rod inserted perpendicular to the distal femoral joint line in the axial plane and 8-10 cm into the distal femur anterior and posterior to the distal cortex of the femur in the sagittal plane or a femoral patient-specific cutting guide sets the femoral component in more natural flexion...
November 29, 2016: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/27900340/retropatellar-accessory-portals-for-improved-access-to-the-patella-anatomic-description-and-evaluation-of-safety
#6
Jason L Koh, Anthony L Logli
BACKGROUND: Standard knee arthroscopy portals are frequently used to address retropatellar chondral pathology. Alternative portals may offer a safe and simple substitute, particularly when reaching the base of deep lesions is required. PURPOSE: To describe and assess the safety of accessory retropatellar portals. STUDY DESIGN: Descriptive laboratory study. METHODS: An anatomic study was performed on 10 fresh-frozen cadaveric knees...
November 2016: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/27894178/comparison-of-radiological-parameters-between-normal-and-patellar-dislocation-groups-in-korean-population-a-rotational-profile-ct-based-study
#7
Jatin Prakash, Jong-Keun Seon, Seong-Hwan Woo, Cheng Jin, Eun-Kyoo Song
Purpose: Patellofemoral instability is a common cause of anterior knee pain in adolescents and young adults. Most normal and pathological values for diagnosing patellofemoral instability are based on Western literature. We conducted this radiological study to determine normal values for different patellofemoral parameters in a Korean population and to evaluate their usefulness in diagnosis. Materials and Methods: We retrospectively reviewed the rotational profile computerized tomography (CT) scans of the patellar dislocation and control groups...
December 1, 2016: Knee Surgery & related Research
https://www.readbyqxmd.com/read/27894177/variability-of-measurement-of-patellofemoral-indices-with-knee-flexion-and-quadriceps-contraction-an-mri-based-anatomical-study
#8
Edward Laugharne, Navi Bali, Sanjay Purushothamdas, Faris Almallah, Rik Kundra
Purpose: The purpose of this study was to investigate the impact of varying knee flexion and quadriceps activity on patellofemoral indices measured on magnetic resonance imaging (MRI). Materials and Methods: MRI of the knee was performed in 20 patients for indications other than patellar or patellofemoral pathology. Axial and sagittal sequences were performed in full extension of the knee with the quadriceps relaxed, full extension of the knee with the quadriceps contracted, 30° flexion of the knee with the quadriceps relaxed, and 30° flexion with the quadriceps contracted...
December 1, 2016: Knee Surgery & related Research
https://www.readbyqxmd.com/read/27894172/the-spect-ct-evaluation-of-compartmental-changes-after-open-wedge-high-tibial-osteotomy
#9
Tae Won Kim, Byung Kag Kim, Dong Whan Kim, Jae Ang Sim, Beom Koo Lee, Yong Seuk Lee
Purpose: The purpose of this study was to evaluate compartmental changes using combined single-photon emission computerized tomography and conventional computerized tomography (SPECT/CT) after open wedge high tibial osteotomy (OWHTO) for providing clinical guidance for proper correction. Materials and Methods: Analysis was performed using SPECT/CT from around 1 year after surgery on 22 patients who underwent OWHTO. Postoperative mechanical axis was measured and classified into 3 groups: group I (varus), group II (0°-3° valgus), and group III (>3° valgus)...
December 1, 2016: Knee Surgery & related Research
https://www.readbyqxmd.com/read/27894010/a-magnetic-resonance-imaging-study-of-abnormalities-of-the-patella-and-patellar-tendon-that-predispose-children-to-acute-patellofemoral-dislocation
#10
Barış Yılmaz, Esin Derin Çiçek, Evrim Şirin, Güzelali Özdemir, Özgün Karakuş, Hasan Hilmi Muratlı
This study compared 20 children hospitalised with acute patellofemoral dislocation with an age-matched healthy control group with no history of knee problems or patellar dislocation. The following morphological parameters were significantly different between the groups: the mean patellar width and length, mean sulcus depth, mean patellar tendon width and total patellar volume. The magnetic resonance imaging findings of this study suggested that structurally smaller than normal patella and patellar tendon volumes are predisposing factors for acute patellofemoral dislocation...
November 17, 2016: Clinical Imaging
https://www.readbyqxmd.com/read/27893149/bipartite-patella
#11
Chandra M Jennings, Lindsay Tjiattas-Saleski
No abstract text is available yet for this article.
December 1, 2016: Journal of the American Osteopathic Association
https://www.readbyqxmd.com/read/27890337/a-double-button-adjustable-loop-device-is-biomechanically-equivalent-to-tension-band-wire-in-the-fixation-of-transverse-patellar-fractures-a-cadaveric-study
#12
Fucai Han, Christopher Jon Pearce, David Q K Ng, Amit K Ramruttun, Desmond Y R Chong, Diarmuid Murphy, Chin Tat Lim, Bernard C S Lee
INTRODUCTION: Tension-band wire fixation of patellar fractures is associated with significant hardware-related complications and infection. Braided polyester suture fixation is an alternative option. However, these suture fixations have higher failure rates due to the difficulty in achieving rigid suture knot fixation. The Arthrex syndesmotic TightRope, which is a double-button adjustable loop fixation device utilizing a 4-point locking system using FibreWire, may not only offer stiff rigid fixation using a knotless system, but may also obviate the need for implant removal due to hardware related problems...
November 17, 2016: Injury
https://www.readbyqxmd.com/read/27888316/erratum-to-treatment-of-patella-baja-by-a-modified-z-plasty
#13
Guido Wierer, Christian Hoser, Elmar Herbst, Elisabeth Abermann, Christian Fink
No abstract text is available yet for this article.
November 25, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/27884141/normal-patellofemoral-kinematic-patterns-during-daily-activities-in-dogs
#14
Erica J Moore, Stanley E Kim, Scott A Banks, Antonio Pozzi, Jason D Coggeshall, Stephen C Jones
BACKGROUND: Patellar abnormalities are a common cause of pain and lameness in dogs; however, in vivo the relative motion between the femur and patella in dogs is not well described. The objective of this study was to define normal in vivo sagittal plane patellofemoral kinematics in three axes of motion using non-invasive methods. We hypothesized patellofemoral alignment in the sagittal plane would tightly correlate with the femorotibial flexion angle. Six healthy dogs without orthopedic disease underwent computed tomography (CT) of their hind limbs to create 3-D models of the patella and femur...
November 25, 2016: BMC Veterinary Research
https://www.readbyqxmd.com/read/27882577/sesamoid-bones-in-tuatara-sphenodon-punctatus-investigated-with-x-ray-microtomography-and-implications-for-sesamoid-evolution-in-lepidosauria
#15
Sophie Regnault, John R Hutchinson, Marc E H Jones
Sesamoids bones are small intra-tendinous (or ligamentous) ossifications found near joints and are often variable between individuals. Related bones, lunulae, are found within the menisci of certain joints. Several studies have described sesamoids and lunulae in lizards and their close relatives (Squamata) as potentially useful characters in phylogenetic analysis, but their status in the extant outgroup to Squamata, tuatara (Sphenodon), remains unclear. Sphenodon is the only living rhynchocephalian, but museum specimens are valuable and difficult to replace...
November 24, 2016: Journal of Morphology
https://www.readbyqxmd.com/read/27879001/osteoarthritis-alters-the-patellar-bones-subchondral-trabecular-architecture
#16
Sebastian Hoechel, Hans Deyhle, Mireille Toranelli, Magdalena Müller-Gerbl
Following the principles of "morphology reveals biomechanics", the cartilage-osseous interface and the trabecular network show defined adaptation in response to physiological loading. In the case of a compromised relationship, the ability to support the load diminishes and the onset of osteoarthritis (OA) may arise. To describe and quantify the changes within the subchondral bone plate (SBP) and trabecular architecture, 10 human OA patellae were investigated by CT and micro-CT. The results are presented in comparison to a previously published dataset of 10 non-OA patellae which were evaluated in the same manner...
November 23, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/27876459/local-and-widespread-hyperalgesia-in-female-runners-with-patellofemoral-pain-are-influenced-by-running-volume
#17
Marcella Ferraz Pazzinatto, Danilo de Oliveira Silva, Juliana Pradela, Maira Bergamaschi Coura, Christian Barton, Fábio Mícolis de Azevedo
OBJECTIVES: To compare pressure pain threshold (PPT) around the knee (local hyperalgesia) and at a site remote to the knee (widespread hyperalgesia) between female runners with and without patellofemoral pain (PFP); and to evaluate the relationship between running volume, self-reported knee function and PPT measures. DESIGN: Cross-sectional study. METHODS: Twenty female runners with PFP and twenty pain-free female runners participated in the study...
November 11, 2016: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/27876420/hereditary-bilateral-genu-recurvatum-case-report-of-a-family
#18
Peter Feczko, Pieter Emans
BACKGROUND: Genu recurvatum is a rare condition in children and adolescents. The origin can be osseous, ligamentous and mixed. METHODS: We describe for the first time a family inclusive two brothers and their mother with hereditary bilateral genu recurvatum of unknown etiology. The possible underlying pathology and treatment are discussed. RESULTS: The underlying pathology of the early closure of the apophysis of the tibial tuberosity remained unclear...
November 19, 2016: Knee
https://www.readbyqxmd.com/read/27876283/importance-of-trabecular-anisotropy-in-finite-element-predictions-of-patellar-strain-after-total-knee-arthroplasty
#19
A Latypova, D P Pioletti, A Terrier
Patellar fracture and anterior knee pain remain major complications after Total Knee Arthroplasty (TKA). Patient-specific finite element (FE) models should help improve understanding of these complications through estimation of joint and bone mechanics. However, sensitivity of predictions on modeling techniques and approaches is not fully investigated. In particular, the importance of patellar bone anisotropy, usually omitted in FE models, on strain prediction is still unknown. The objective of this study was thus to estimate the influence of modeling patellar trabecular anisotropy on prediction of patellar strain in TKA models...
November 18, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27876254/is-selectively-not-resurfacing-the-patella-an-acceptable-practice-in-primary-total-knee-arthroplasty
#20
Hilal Maradit-Kremers, Omar J Haque, Walter K Kremers, Daniel J Berry, David G Lewallen, Robert T Trousdale, Rafael J Sierra
BACKGROUND: To resurface or not to resurface the patella remains a controversy in total knee arthroplasty (TKA). The purpose of this study was to assess the long-term outcomes associated with selectively not resurfacing the patella. METHODS: This was a historical cohort study of 15,497 patients with 21,371 primary TKA procedures performed at a single institution between 1985 and 2010. The cohort included 402 (2%) knees with unresurfaced patellae and 20,969 knees with all-polyethylene patellae designs...
October 20, 2016: Journal of Arthroplasty
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