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patellar tracking

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https://www.readbyqxmd.com/read/28419810/the-relationship-of-static-tibial-tubercle-trochlear-groove-measurement-and-dynamic-patellar-tracking
#1
Victor R Carlson, Frances T Sheehan, Aricia Shen, Lawrence Yao, Jennifer N Jackson, Barry P Boden
BACKGROUND: The tibial tubercle to trochlear groove (TT-TG) distance is used for screening patients with a variety of patellofemoral joint disorders to determine who may benefit from patellar medialization using a tibial tubercle osteotomy. Clinically, the TT-TG distance is predominately based on static imaging with the knee in full extension; however, the predictive ability of this measure for dynamic patellar tracking patterns is unknown. PURPOSE: To determine whether the static TT-TG distance can predict dynamic lateral displacement of the patella...
April 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28378002/total-knee-arthroplasty-for-treatment-of-osteoarthritis-with-prolonged-patellar-dislocation
#2
Kosuke Kumagai, Mitsuhiko Kubo, Tsutomu Maeda, Susumu Araki, Suguru Shioji, Noriaki Okumura, Hitomi Fujikawa, Taku Kawasaki, Shinji Imai, Yoshitaka Matsusue
Prolonged dislocation of the patella is a rare condition and is often related to severe osteoarthritis (OA) of the femorotibial (FT) joint. For this condition's treatment, numerous surgical techniques using total knee arthroplasty (TKA) have been published. To the best of our knowledge, this case report is the first description of the use of lateral release alone to treat recurrent patellar subluxation with TKA. An interesting point in this case is that the patient had a good recovery after TKA in spite of quite a long-term (a duration of almost 55 years) dislocation of her patella and development of secondary OA...
March 2017: Arthroplasty Today
https://www.readbyqxmd.com/read/28373624/the-posterior-condylar-cartilage-affects-rotational-alignment-of-the-femoral-component-in-varus-knee-osteoarthritis
#3
Daisuke Hamada, Keizo Wada, Hiroshi Mikami, Shunichi Toki, Tomohiro Goto, Takahiko Tsutsui, Tomoya Takasago, Akihiro Nagamachi, Koichi Sairyo
Rotational alignment of the femoral component in total knee arthroplasty (TKA) is important for patellar tracking and ligament balance. Preoperative planning based on radiography might have a potential risk for over-rotation because these X-ray based measurements can not detect asymmetric cartilage wear on posterior condyle. The purpose of this study is to evaluate the effect of the posterior condylar cartilage of varus osteoarthritic knee on rotational alignment of the femoral component in TKA. We established two different condylar twist angles (CTA) from intraoperative multiplanar reconstruction (MPR) images and intraoperative information of navigation system...
2017: Journal of Medical Investigation: JMI
https://www.readbyqxmd.com/read/28355673/the-extensor-mechanism-imaging-and-intervention
#4
Colm J McMahon, Arun Ramappa, Kenneth Lee
We present an overview of imaging and intervention of the extensor mechanism of the knee. Particular focus is placed on the evaluation of patellofemoral tracking disorders, patellar and quadriceps tendinosis and tears, patellar fracture, lateral patellar condyle patellar friction syndrome, and prepatellar bursitis. Anatomical and biomechanical factors contributing to these disorders are considered. Imaging evaluation is presented in a clinical context, and therapeutic options for these disorders are discussed...
April 2017: Seminars in Musculoskeletal Radiology
https://www.readbyqxmd.com/read/28347597/does-standing-limb-alignment-after-total-knee-arthroplasty-predict-dynamic-alignment-and-knee-loading-during-gait
#5
Charles Rivière, Matthieu Ollivier, Damien Girerd, Jean Noël Argenson, Sébastien Parratte
BACKGROUND: A principle of TKA is to achieve a neutral standing coronal alignment of the limb (HKA angle) to reduce risks of implant loosening, reduce polyethylene wear, and optimize patellar tracking. Several long-term studies have questioned this because the relationship between alignment and implant survivorship is weaker than previously reported. We hypothesize that standing HKA poorly predicts implant failure because it does not predict dynamic HKA, dynamic adduction moment, and loading of the knee during gait...
March 24, 2017: Knee
https://www.readbyqxmd.com/read/28298067/incidence-of-second-anterior-cruciate-ligament-tears-1990-2000-and-associated-factors-by-geographic-locale
#6
Nathan D Schilaty, Nathaniel A Bates, Thomas L Sanders, Aaron J Krych, Michael J Stuart, Timothy E Hewett
BACKGROUND: Second anterior cruciate ligament (ACL) tears after reconstruction occur at a reported rate of 20% to 30%. This high frequency indicates that there may be factors that predispose an athlete to graft failure and ACL tears of the contralateral knee. PURPOSE: To determine the incidence of second ACL injuries in a geographic population-based cohort over a 10-year observation period. STUDY DESIGN: Descriptive epidemiological study. METHODS: International Classification of Diseases, 9th Revision (ICD-9) codes relevant to the diagnosis of an ACL tear and the procedure code for ACL reconstruction were searched across the Rochester Epidemiology Project, a multidisciplinary county database, between the years of 1990 and 2000...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28244917/in-vivo-three-dimensional-patellar-mechanics-normal-knees-compared-with-domed-and-anatomic-patellar-components
#7
Adrija Sharma, Trevor F Grieco, Sumesh M Zingde, Douglas A Dennis, Matthew R Anderle, Richard D Komistek
BACKGROUND: Patellofemoral complications are a major cause of revision surgery following total knee arthroplasty (TKA). High forces occurring at the patellofemoral articulation coupled with a small patellofemoral contact area pose substantial design challenges. In this study, the three-dimensional (3D) in vivo mechanics of domed and anatomically shaped patellar components were compared with those of native patellae. METHODS: Ten normal knees, 10 treated with an LCS-PS (low contact stress-posterior stabilized) TKA (anatomically shaped patellar component), and 10 treated with a PFC Sigma RP-PS (press-fit condylar Sigma rotating platform-posterior stabilized) TKA (domed patellar component) were analyzed under fluoroscopic surveillance while the patient performed a weight-bearing deep knee bend from full knee extension to maximum knee flexion...
March 1, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28210658/patellar-maltracking-persists-in-adolescent-females-with-patellofemoral-pain-a-longitudinal-study
#8
Victor R Carlson, Barry P Boden, Aricia Shen, Jennifer N Jackson, Katharine E Alter, Frances T Sheehan
BACKGROUND: Patellofemoral pain is one of the most common conditions seen in sports medicine practices, particularly among adolescent females. However, the natural history of the underlying pathology in patellofemoral pain during puberty remains poorly understood. PURPOSE: The purpose of this longitudinal study is to assess changes in patellar maltracking patterns in subjects with patellofemoral pain as they mature from mid- to late adolescence. STUDY DESIGN: Cohort study; Level of evidence, 3...
February 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28160369/comparative-t2-and-t1%C3%AF-mapping-of-patellofemoral-cartilage-under-in-situ-mechanical-loading-with-prospective-motion-correction
#9
Thomas Lange, Benjamin R Knowles, Michael Herbst, Kaywan Izadpanah, Maxim Zaitsev
PURPOSE: To demonstrate improved T2 and T1ρ mapping of patellofemoral cartilage with in situ loading by means of prospective motion correction and to assess load-induced changes in healthy subjects. MATERIALS AND METHODS: Established T2 and T1ρ mapping sequences were augmented with prospective motion correction based on optical tracking. Protocols were optimized for robust imaging of the patellofemoral cartilage at a field strength of 3T. Subjects were positioned in the scanner with knee flexion and in situ loading of the patellofemoral joint was performed with a pneumatic loading device...
February 3, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28061515/spacer-based-gap-balancing-in-total-knee-arthroplasty-clinical-success-with-a-reproducible-technique
#10
Frédéric Lavoie
Purpose Proper coronal and transverse ligament balancing is an important aspect of total knee arthroplasty (TKA) and has an impact on postoperative outcome. Many variations of the gap balancing technique were described to address this challenge, most of them using various tensioning devices, but none for which the use is widespread. The aim of this paper is to describe a gap technique variant for TKA using spacer blocks and report the clinical results for a cohort of patients on which it was used. Methods A total of 114 TKAs were performed in 101 patients using a standardized surgical technique that integrates ligament balancing with sizing and positioning of the femoral component...
January 6, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28032712/relationship-between-the-patellar-ridge-and-the-femoral-trochlea-in-the-patellar-tracking
#11
Xiao-Meng Wang, Hui-Xin Liu, Jing-Hui Niu, Gu-Man Duan, Fei Wang
OBJECTIVE: To investigate the anatomic morphology of the patellar ridge and how it matches the femoral trochlea in patellar tracking. METHOD: We selected 40 volunteers, 20 males (age, 28 ± 5 years) and 20 female (age, 27 ± 6 years), who were completely asymptomatic with normal knee structures. We measured the right or left legs of volunteers, and the region from the distal femur to the tibial tuberosity was scanned by computed tomography (CT) with flexion at 0°, 30°, 60°, and 90°...
November 2016: Orthopaedic Surgery
https://www.readbyqxmd.com/read/28032709/relationship-between-patellar-tracking-and-the-screw-home-mechanism-of-tibiofemoral-joint
#12
Li-Kang Zhang, Xiao-Meng Wang, Ying-Zhen Niu, Hui-Xin Liu, Fei Wang
OBJECTIVE: To demonstrate the effect of the screw-home motion on the stability of the patellofemoral joint, and investigate its mechanism of regulation of patellar tracking. METHODS: Twenty volunteers who met the criteria were examined. All subjects had axial computed tomography (CT) scanning performed on bilateral knees at 0° and 30° of flexion. Scanning began above the femorotibial articulation and femoral trochlear groove, and moved sequentially down to the level of the anterior tibial tubercle...
November 2016: Orthopaedic Surgery
https://www.readbyqxmd.com/read/28029800/patellofemoral-kinematics-and-tibial-tuberosity-trochlear-groove-distances-in-female-adolescents-with-patellofemoral-pain
#13
Victor R Carlson, Barry P Boden, Frances T Sheehan
BACKGROUND: Patellofemoral pain (PFP) is a prevalent disorder among female adolescents. Overuse is frequently cited as the cause of pain for this population. What is currently unclear, however, is if the patella demonstrates abnormal tracking patterns relative to the femoral trochlear groove in female adolescents with PFP. PURPOSE: The aim of this case-control study was to determine if abnormal patellar tracking patterns are present in female adolescents with PFP...
April 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27904790/current-concepts-in-the-treatment-of-gross-patellofemoral-instability
#14
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. Following an initial patellar dislocation, nonoperative management with bracing and physical therapy is an acceptable option, despite limited evidence that operative management may improve functional outcome and reduce recurrent dislocations...
December 2016: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/27836693/should-the-position-of-the-patellar-component-replicate-the-vertical-median-ridge-of-the-native-patella
#15
Rae Hyeong Lee, Hae Won Jeong, Jin Kyu Lee, Choong Hyeok Choi
BACKGROUND: In total knee arthroplasty (TKA), the position of the patellar component can affect patellar tracking. However, the patellar component cannot always replicate the original high point of the patella because of anatomical variance. This study investigated whether altering the highest point of the patella can affect outcomes of primary TKA, especially in patients having a patella with a far-medialized median ridge. METHODS: A retrospective review was performed for 177 knees (143 patients) treated with primary TKA between July 2011 and March 2014...
November 8, 2016: Knee
https://www.readbyqxmd.com/read/27818987/total-knee-arthroplasty-with-subvastus-approach-in-patient-with-chronic-post-traumatic-patellar-dislocation
#16
Jader Joel Machado Junqueira, Camilo Partezani Helito, Marcelo Batista Bonadio, Jose Ricardo Pécora, Marco Kawamura Demange
Chronic lateral dislocation of the patella is a rare condition and acquired causes are usually secondary to knee trauma. The neglected chronic dislocation leads to progressive genu valgum and external tibial torsion deformities with subsequent gonarthrosis, which becomes painful and debilitating. There is no consensus regarding treatment of these patients, but total knee arthroplasty (TKA) is a useful therapy in cases of painful symptomatic gonarthrosis. Few reports have shown that subvastus approach and lateral release may be a valid option for TKA, since it allows the correction of valgus deformity and patellar tracking without interrupting vascular blood supply of patella...
September 2016: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/27815014/rotating-platform-versus-fixed-bearing-total-knee-arthroplasty-at-mid-term-follow-up
#17
J Ryan Martin, Taylor R Beahrs, Keith A Fehring, Robert T Trousdale
BACKGROUND: Rotating platform posterior stabilized (RP) total knee arthroplasty (TKA) was initially developed in part to decrease polyethylene wear and to improve patellar tracking. There have been limited studies evaluating the longevity and causes of reoperation or revision for this implant. The following study compares mid-term survival rates and causes for reoperation between fixed bearing (FB) TKAs. METHODS: We identified 11,416 patients who underwent a primary posterior stabilized TKA between 2001 and 2013...
December 2016: Knee
https://www.readbyqxmd.com/read/27709116/dynamic-simulation-of-the-effects-of-graft-fixation-errors-during-medial-patellofemoral-ligament-reconstruction
#18
John J Elias, Michael J Kelly, Kathryn E Smith, Kenneth A Gall, Jack Farr
BACKGROUND: Medial patellofemoral ligament (MPFL) reconstruction is performed to prevent recurrent instability, but errors in femoral fixation can elevate graft tension. HYPOTHESIS: Errors related to femoral fixation will overconstrain the patella and increase medial patellofemoral pressures. STUDY DESIGN: Controlled laboratory study. METHODS: Five knees with patellar instability were represented with computational models...
September 2016: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/27703948/recurrent-patellar-instabilty-culminating-in-a-vertically-rotated-and-a-locked-patellar-dislocation-a-rare-entity
#19
Devgan A, Rohilla R, Jain A, Mehta H, Singh S
INTRODUCTION: Locked vertical patellar dislocations are rare and pose a therapeutic challenge. This case is more unusual, as the patient was a known case of recurrent patellar dislocation and presented with an atraumatic locked and vertically rotated patellar dislocation. This type of presentation has never been reported in literature to the best of our knowledge. CASE PRESENTATION: A 14-year-old healthy male child with previous history of recurrent lateral dislocation of patella presented to accident & emergency department with complaints of inability to walk or bear weight on his left lower limb after he spontaneously dislocated his patella while running on uneven ground...
April 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/27687176/the-role-of-patelloplasty-in-total-knee-arthroplasty
#20
REVIEW
Simone Cerciello, Jonathan Robin, Sébastien Lustig, Giulio Maccauro, Thomas J Heyse, Philippe Neyret
INTRODUCTION: Anterior knee pain (AKP) is a frequent complication after total knee arthroplasty (TKA). Patelloplasty, defined as reshaping the patella for optimal tracking in the trochlea, has been proposed to reduce the rate of this complication in patellar retaining implants. Aim of this study was to analyze the available literature regarding the outcomes of patelloplasty and to assess its methodological quality. MATERIALS AND METHODS: A comprehensive review of the English literature was performed using the keywords "total knee arthroplasty", "patelloplasty" and "patellaplasty" with no limit regarding the year of publication...
November 2016: Archives of Orthopaedic and Trauma Surgery
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