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patella dislocation

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https://www.readbyqxmd.com/read/28029579/patellar-inversion-180-degree-rotation-of-the-patella-around-its-vertical-axis-within-the-intercondylar-notch
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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...
December 8, 2016: Der Orthopäde
https://www.readbyqxmd.com/read/27915446/superior-dislocation-of-the-patella-a-pathognomonic-finding-and-review-of-literature
#7
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
#8
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
#9
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
#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/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
#11
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
#12
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/27717972/assessment-of-demographic-and-pathoanatomic-risk-factors-in-recurrent-patellofemoral-instability
#13
Laurie Anne Hiemstra, Sarah Kerslake, Mark Lafave
PURPOSE: The WARPS/STAID classification employs clinical assessment of presenting features and anatomic characteristics to identify two distinct subsets of patients within the patellofemoral instability population. The purpose of this study was to further define the specific demographics and the prevalence of risky pathoanatomies in patients classified as either WARPS or STAID presenting with recurrent patellofemoral instability. A secondary purpose was to further validate the WARPS/STAID classification with the Banff Patella Instability Instrument (BPII), the Marx activity scale and the Patellar Instability Severity Score (ISS)...
October 7, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/27703948/recurrent-patellar-instabilty-culminating-in-a-vertically-rotated-and-a-locked-patellar-dislocation-a-rare-entity
#14
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/27699726/modified-elmslie-trillat-procedure-for-recurrent-dislocation-of-the-patella
#15
Genya Mitani, Takashi Maeda, Tomonori Takagaki, Kosuke Hamahashi, Kenji Serigano, Yutaka Nakamura, Masato Sato, Joji Mochida
Many groups have reported good to excellent clinical outcomes of the Elmslie-Trillat (ET) procedure for recurrent dislocation of the patella. However, the mean follow-up period of these studies was no more than 5 years. We hypothesized that the long-term postoperative outcomes of the modified ET procedure for recurrent dislocation of the patella would be acceptable compared with those of other procedures. The long-term postoperative outcomes of patients treated with the modified ET procedure were examined. A total of 31 knees in 27 patients with recurrent dislocation of the patella who underwent a modified ET procedure (without medial capsular plication) were evaluated...
October 3, 2016: Journal of Knee Surgery
https://www.readbyqxmd.com/read/27650016/-abstracta-woman-with-knee-pain-after-a-fall-in-childhood
#16
J H J van Erp, R W Brouwer
A 32-year-old woman presented with pain in her left knee ever since she had fallen down the stairs as a child and had landed on this knee. On the X-ray we saw two large patella fragments. We made the diagnosis of dislocated and subluxated fracture of the patella without consolidation. The previously missed fracture was treated conservatively.
2016: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/27613760/morphology-and-anatomic-patellar-instability-risk-factors-in-first-time-traumatic-lateral-patellar-dislocations
#17
Marie Askenberger, Per-Mats Janarv, Throstur Finnbogason, Elizabeth A Arendt
BACKGROUND: The incidence of primary lateral patellar dislocation (LPD) in children aged 9 to 14 years is 0.6 to 1.2 per 1000. Causation is assumed to be multifactorial, including anatomic variants of the patellofemoral (PF) joint that result in a higher risk of LPD. No publication has compared the morphology of the PF joint and anatomic patellar instability risk factors (APIFs) in a primary LPD population versus controls, defining children by skeletal maturity. PURPOSE: To characterize the PF morphology and APIFs (trochlear dysplasia, abnormal lateral patellar tilt, elevated tibial tubercle-trochlear groove [TT-TG] distance, patella alta) through magnetic resonance imaging (MRI) measurements in skeletally immature children with and without a primary LPD and to identify (potential) distinctive differences between these 2 groups...
January 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27590642/does-the-utilization-of-allograft-tissue-in-medial-patellofemoral-ligament-reconstruction-in-pediatric-and-adolescent-patients-restore-patellar-stability
#18
Eric Hohn, Nirav K Pandya
BACKGROUND: Medial patellofemoral ligament (MPFL) reconstruction is one of several surgical procedures used to treat patellofemoral instability. Use of allograft tissue can preserve autogenous tissue and may be preferable in patients with connective tissue disorders or ligamentous laxity. Although there are successful reports in adults, it is unclear if the use of allograft tissue in MPFL reconstruction can restore patellofemoral stability in children and adolescents. QUESTIONS/PURPOSES: (1) Does allograft tissue in MPFL reconstruction in pediatric and adolescent patients restore patellar stability? (2) What complications were associated with allograft MPFL reconstructions in children and adolescents? METHODS: Between June 2012 and August 2015, one surgeon (NKP) performed 26 MPFL reconstructions in 23 patients with gracilis allograft for traumatic patellar instability...
September 2, 2016: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/27436719/trochleoplasty-as-a-solitary-treatment-for-recurrent-patellar-dislocation-results-in-good-clinical-outcome-in-adolescents
#19
Carlo Camathias, Katrin Studer, Ata Kiapour, Erich Rutz, Patrick Vavken
BACKGROUND: The essential static patellar stabilizer is a normal-shaped trochlear groove. A dysplastic groove destabilizes the patella. Trochleoplasty approaches this underlying condition and reshapes the trochlea. However, studies have reported on trochleoplasty for revision cases or as accompanied by other interventions. The effect of trochleoplasty alone remains unexplained. PURPOSE: To introduce trochleoplasty as a stand-alone treatment for recurrent patellar dislocation and to compare its pre- to postoperative functional and clinical variables...
July 19, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27405662/load-analysis-of-a-patellofemoral-joint-by-a-quadriceps-muscle
#20
Adam Ciszkiewicz, Józef Knapczyk
PURPOSE: The aim of this paper is to develop a model of the patellofemoral joint by considering the linear displacement along axis of cylindrical joint and to use this model in the analysis of the femur spatial displacements caused by the quadriceps muscle force. METHOD: The linear displacement along the axis of cylindrical joint of the patellofemoral joint is computed using optimization methods - minimization of the difference between the modeled and measured spatial displacements of the femur with respect to the tibia over the full range of the knee flexion...
2016: Acta of Bioengineering and Biomechanics
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