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https://www.readbyqxmd.com/read/28193295/biomechanical-comparison-of-single-and-double-bundle-medial-patellofemoral-ligament-reconstruction
#1
Qing Wang, Wenhan Huang, Daozhang Cai, Huayang Huang
BACKGROUND: Recurrent patellar dislocation is common clinically, primarily in adolescents. However, the biomechanical properties of single- and double-bundle medial patellofemoral ligament (MPFL) reconstruction remain poorly understood. METHODS: Six fresh frozen adult cadaveric knee specimens were obtained for this study. Each specimen was fixed at 0° to test the force needed when the patella was laterally shifted 10 mm at a speed of 0.5 mm/s, and the test was repeated three times...
February 13, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28179061/plateau-patella-angle-an-option-for-the-evaluation-of-patellar-height-in-patients-with-patellar-instability
#2
Marcelo Batista Bonadio, Camilo Partezani Helito, Julio Augusto do Prado Torres, Riccardo Gomes Gobbi, José Ricardo Pécora, Gilberto Luis Camanho, Marco Kawamura Demange
BACKGROUND: Patellar instability is a debilitating disease. An important factor related to recurrent dislocation is patellar height. A new method of patellar height measurement, the plateau-patella angle (PPA), was proposed in 2011. However, to date, there is no study evaluating the use of this method in patients with patellar instability. The aim of this study was to evaluate the PPA in patients with recurrent patellar dislocation. METHODS: This was a retrospective evaluation of the radiographs of 78 knees with patellar instability...
February 5, 2017: Knee
https://www.readbyqxmd.com/read/28178962/the-outcomes-of-the-modified-fulkerson-osteotomy-procedure-to-treat-habitual-patellar-dislocation-associated-with-high-grade-trochlear-dysplasia
#3
Hong Chen, Daohong Zhao, Jingming Xie, Qihui Duan, Jun Zhang, Zhidan Wu, Jia Jiang
BACKGROUND: Habitual patellar dislocation is not common in clinical practice, but it has a deep impact on the patient's lifestyle and movement. There has been no large case-control study on habitual patellar dislocation, and the management of it is still controversial. The aim of this study was to observe the efficacy of the modified Fulkerson procedure on patients with habitual patellar dislocation with high-grade trochlear dysplasia without trochleoplasty and to evaluate the results of this procedure...
February 8, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28148656/adolescent-patellar-instability-current-concepts-review
#4
REVIEW
D Clark, A Metcalfe, C Wogan, V Mandalia, J Eldridge
Patellar instability most frequently presents during adolescence. Congenital and infantile dislocation of the patella is a distinct entity from adolescent instability and measurable abnormalities may be present at birth. In the normal patellofemoral joint an increase in quadriceps angle and patellar height are matched by an increase in trochlear depth as the joint matures. Adolescent instability may herald a lifelong condition leading to chronic disability and arthritis. Restoring normal anatomy by trochleoplasty, tibial tubercle transfer or medial patellofemoral ligament (MPFL) reconstruction in the young adult prevents further instability...
February 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28146393/medial-patellofemoral-ligament-reconstruction-combined-with-distal-realignment-for-recurrent-dislocations-of-the-patella
#5
Iswadi Damasena, Murray Blythe, David Wysocki, David Kelly, Peter Annear
BACKGROUND: Tibial tubercle transfer (TTT) and medial patellofemoral ligament (MPFL) reconstruction have both shown, either in isolation or in combination, to provide improved patellofemoral joint (PFJ) stability. There are few studies that provide evidence that this remains true in the long term. PURPOSE: To compare the long-term results of patellar instability after TTT with and without MPFL reconstruction in 2 randomized groups. STUDY DESIGN: Randomized controlled trial; Level of evidence, 1...
February 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28124724/number-of-positive-radiographic-findings-in-pediatric-trauma-patients
#6
Thomas Ruffing, Tim Danko, Thomas Henzler, Christel Weiss, Alexander Hofmann, Markus Muhm
PURPOSE: Conventional radiography is frequently performed in pediatric patients in whom fractures and dislocations are suspected. However, until now, the rate of positive findings of the most commonly performed radiographic examinations in pediatric patients is unknown. The aim of this study was to evaluate the number of positive findings in the 20 most frequently requested standard radiographic examinations in pediatric patients in a level 1 trauma center systematically. METHODS: A transversal cohort study was conducted at a level 1 trauma center in Germany (2008-2014)...
January 26, 2017: Emergency Radiology
https://www.readbyqxmd.com/read/28118233/a-novel-functional-correction-method-for-habitual-patellar-dislocation-using-autologous-hamstring-tendon-a-case-report
#7
Yasunari Ikuta, Nobuo Adachi, Masataka Deie, Masakazu Ishikawa, Atsuo Nakamae, Mitsuo Ochi
Habitual patellar dislocation is an uncommon condition. In this case, a patient demonstrated lateral patellar dislocation in the middle or terminal range of flexion. A functional correction of the patella was devised so that the fixation site of the autologous graft on the femur was able to stabilize the patella selectively during the middle or terminal range of flexion. It is not the anatomical medial patellofemoral ligament attachment of the femur that is essential, but that a relevant fixation point on the femur should be sought in each patient to obtain stabilization of the patella to reverse habitual patellar dislocation...
January 21, 2017: Journal of Pediatric Orthopedics. Part B
https://www.readbyqxmd.com/read/28107220/treatment-of-primary-acute-patellar-dislocation-systematic-review-and-quantitative-synthesis-of-the-literature
#8
Umile Giuseppe Longo, Mauro Ciuffreda, Joel Locher, Alessandra Berton, Giuseppe Salvatore, Vincenzo Denaro
PURPOSE: The aim of this study was to evaluate clinical outcomes, rate of redislocation, and complications after conservative or surgical procedures used to treat primary acute patellar dislocation. METHODS: A comprehensive search of PubMed, Medline, CINAHL, Cochrane, Embase, and Google Scholar databases using various combinations of the keywords "patella," "dislocation," "treatment," "acute," "primary" was performed. The following data were extracted: demographics, chondral defects and soft tissue lesions, outcome measurements, type of management, recurrence of instability, and complications...
January 17, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28029579/patellar-inversion-180-degree-rotation-of-the-patella-around-its-vertical-axis-within-the-intercondylar-notch
#9
Samarth Mittal, Arkesh M, Vivek Shankar, Swapnil Singh, Pankaj Sharma, Ravi Mittal
BACKGROUND: Dislocation of the patella can occur around its vertical as well as horizontal axis. However, near 180 degree rotation of the patella around its vertical axis within the intercondylar notch without its complete dislocation has never been previously reported to the best of our knowledge. We report one such neglected case along with its management. METHODS: The patient underwent open reduction and de-rotation of patella with repair of the medial and lateral patellar retinacula...
October 28, 2016: Knee
https://www.readbyqxmd.com/read/28028569/functional-testing-and-return-to-sport-following-stabilization-surgery-for-recurrent-lateral-patellar-instability-in-competitive-athletes
#10
Aaron J Krych, Michael P O'Malley, Nick R Johnson, Rohith Mohan, Timothy E Hewett, Michael J Stuart, Diane L Dahm
PURPOSE: Medial patellofemoral ligament (MPFL) reconstruction and tibial tubercle osteotomy are commonly used to treat recurrent lateral patellar instability, yet there are limited available data on return to sport (RTS) following these procedures. The purpose of this study is to evaluate patient factors associated with excellent functional outcomes, including successful RTS, following surgical stabilization including MPFL reconstruction in competitive athletes with recurrent lateral patellar instability...
December 27, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28018089/intra-articular-dislocation-of-patella-reduced-by-closed-method-a-rare-case-report
#11
Saurabh Pagdal, Onkar Lande, Umesh Jadhav
Intra-articular dislocation of the patella is a rare injury. Two types of intra-articular dislocations have been described in literature. In horizontal type, the patella has rotated on its horizontal axis. In the second type, the patella rotates on its vertical axis. These dislocations frequently are difficult to reduce by closed methods, and open reduction generally is required. We describe here a case of horizontal intra-articular dislocation of patella in a young 25-year-old male managed successfully by closed reduction...
October 2016: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/27999505/osteochondral-allograft-transplantation-for-femoral-trochlear-dysplasia
#12
Dharmpal V Vansadia, James R Heltsley, Scott Montgomery, Misty Suri, Deryk G Jones
BACKGROUND: The risk factors for patellofemoral joint instability include laxity of medial patellar restraints, abnormal limb geometry, femoral and tibial malrotation, patella alta, and trochlear dysplasia. Femoral trochlear dysplasia is characterized by a hypoplastic or shallow trochlear groove. CASE REPORT: We report the case of a 31-year-old female with trochlear dysplasia and recurrent patella dislocations, laxity of the medial patellofemoral ligament (MPFL), and high-grade chondromalacia of the trochlea and the patella...
2016: Ochsner Journal
https://www.readbyqxmd.com/read/27941170/management-of-traumatic-patellar-dislocation-in-a-regional-hospital-in-hong-kong
#13
H L Lee, W P Yau
INTRODUCTION: The role of surgery for acute patellar dislocation without osteochondral fracture is controversial. The aim of this study was to report the short-term results of management of patellar dislocation in our institute. METHODS: Patients who were seen in our institution with patella dislocation from January 2011 to April 2014 were managed according to a standardised management algorithm. Pretreatment and 1-year post-treatment International Knee Documentation Committee score, Tegner activity level scale score, and presence of apprehension sign were analysed...
December 12, 2016: Hong Kong Medical Journal, Xianggang Yi Xue za Zhi
https://www.readbyqxmd.com/read/27933343/-conservative-treatment-of-congenital-patellar-dislocation
#14
D Zajonz, E Schumann, M Wojan, M Moche, C-E Heyde
This article presents the rare case of a boy who was born in our hospital with valgus deformity and external rotation of the right lower leg because of congenital patellar dislocation. In the case presented a stable repositioning of the patella could be achieved by redressment with a plaster cast and leg brace. During a 4-year follow-up there were no tendencies towards dislocation during the clinical examination and no dislocation events were documented. In selected cases an attempt at conservative repositioning and retention treatment appears to be worthwhile before surgical treatment is indicated...
February 2017: Der Orthopäde
https://www.readbyqxmd.com/read/27915446/superior-dislocation-of-the-patella-a-pathognomonic-finding-and-review-of-literature
#15
P W van Egmond, M C Vermeulen, C F van Dijke, H C A Graat
A 59-year-old woman with a painful right knee that became locked in extension after a trivial trauma was seen at the emergency room. This was caused by unloaded hyperextension in bed. She was diagnosed with a superior dislocation of the patella. A closed reduction was performed, but a recurrent episode was seen within a week. An arthroscopy was performed, in which the causative osteophytes were removed. In the 12-month follow-up after treatment, no recurrence was seen. A superior dislocation of the patella is caused by patellofemoral osteophytes that interlock...
February 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/27904790/current-concepts-in-the-treatment-of-gross-patellofemoral-instability
#16
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/27894178/comparison-of-radiological-parameters-between-normal-and-patellar-dislocation-groups-in-korean-population-a-rotational-profile-ct-based-study
#17
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/27894010/a-magnetic-resonance-imaging-study-of-abnormalities-of-the-patella-and-patellar-tendon-that-predispose-children-to-acute-patellofemoral-dislocation
#18
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/27842571/medial-patellofemoral-ligament-reconstruction-using-a-bone-groove-and-a-suture-anchor-at-patellar-a-safe-and-firm-fixation-technique-and-3-year-follow-up-study
#19
Hong-De Wang, Jiang-Tao Dong, Shi-Jun Gao
BACKGROUND: Graft fixation is critical to the restoration of the medial patella of femoral ligament function and long-term success. Numerous fixations at the patella have been described, while the complications including patellar fractures, violation of the posterior patella and delay of tendon-to-bone healing remain significant challenges. Here, we describe a safe and firm fixation at the patellar for medial patellofemoral ligament (MPFL) reconstruction and explore the safety angle of drilling the suture anchor at different morphology of the patellar...
November 14, 2016: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/27818987/total-knee-arthroplasty-with-subvastus-approach-in-patient-with-chronic-post-traumatic-patellar-dislocation
#20
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
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