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patellar dislocation

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https://www.readbyqxmd.com/read/28541005/a-combined-closing-wedge-distal-femoral-osteotomy-and-medial-reefing-procedure-for-recurrent-patellar-dislocation-with-genu-valgum
#1
Chong Bum Chang, Gautam M Shetty, Jong Seong Lee, Young Chan Kim, Jae Ho Kwon, Kyung Wook Nha
PURPOSE: Recurrent patellar dislocation is often associated with genu valgum. The purpose of this study was to analyze the short-term results of single-incision, closing-wedge distal femoral osteotomy (CWDFO) combined with medial reefing and lateral release for recurrent patellar instability with genu valgum. MATERIALS AND METHODS: Combined CWDFO/medial reefing/lateral release was performed on 10 knees. Clinical evaluation was based on pre- and postoperative Knee Society Score (KSS) and Kujala patellofemoral score...
July 2017: Yonsei Medical Journal
https://www.readbyqxmd.com/read/28538541/surgical-versus-nonsurgical-interventions-for-treating-patellar-dislocation
#2
Lesley Andrews
No abstract text is available yet for this article.
May 2017: Orthopaedic Nursing
https://www.readbyqxmd.com/read/28528349/high-wear-resistance-of-femoral-components-coated-with-titanium-nitride-a-retrieval-analysis
#3
Christian Fabry, Carmen Zietz, Axel Baumann, Reinhard Ehall, Rainer Bader
PURPOSE: The objective of this study was to evaluate the in vivo wear resistance of cobalt-chromium femoral components coated with titanium nitride (TiN). Our null hypothesis was that the surface damage and the thickness of the TiN coating do not correlate with the time in vivo. METHODS: Twenty-five TiN-coated bicondylar femoral retrievals with a mean implantation period of 30.7 ± 11.7 months were subjected to an objective surface damage analysis with a semi-quantitative assessment method...
May 20, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28465849/mobile-bearing-total-knee-arthroplasty-for-valgus-knee-osteoarthritis-with-permanent-patellar-dislocation-a-case-report-and-review-of-the-literature
#4
Kohei Kamada, Tomoyuki Matsumoto, Koji Takayama, Daisuke Araki, Shingo Hashimoto, Shinya Hayashi, Takehiko Matsushita, Ryosuke Kuroda
Permanent patellar dislocation with tibiofemoral joint osteoarthritis is a relatively rare condition. To treat this condition, total knee arthroplasty with proximal or distal realignment of the extensor mechanism has been reported. We report a challenging case of an 80-year-old woman diagnosed with permanent patellar dislocation with tibiofemoral joint osteoarthritis treated by a mobile bearing total knee arthroplasty utilizing navigation system. Lateral retinaculum release was performed to improve patellar tracking; other proximal or distal realignment of the extensor mechanism was not necessary...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/28463547/economic-decision-model-for-first-time-traumatic-patellar-dislocations-in-adolescents
#5
Benedict U Nwachukwu, Conan So, William W Schairer, Beth E Shubin-Stein, Sabrina M Strickland, Daniel W Green, Emily R Dodwell
BACKGROUND: The surgical management of traumatic patellar dislocations in adolescents is associated with a lower rate of recurrent dislocations compared with nonoperative care. However, the attendant cost of surgery and the quality-of-life benefit of a surgical treatment strategy are unclear. PURPOSE: To compare the cost-utility of 3 management strategies for acute first-time patellar dislocations in adolescents: (1) nonoperative treatment only, (2) initial nonoperative treatment with surgery only for recurrent dislocations, and (3) immediate surgery...
May 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28463535/risk-factors-and-time-to-recurrent-ipsilateral-and-contralateral-patellar-dislocations
#6
Tyson C Christensen, Thomas L Sanders, Ayoosh Pareek, Rohith Mahan, Diane L Dahm, Aaron J Krych
BACKGROUND: Previous studies have reported variable rates of recurrent lateral patellar instability mainly because of limited cohort sizes. In addition, there is currently a lack of information on contralateral patellar instability. PURPOSE: To evaluate the rate of recurrent ipsilateral patellar dislocations and contralateral patellar dislocations after a first-time lateral patellar dislocation. Additionally, risk factors associated with recurrent dislocations (ipsilateral or contralateral) and time to recurrence were investigated...
May 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28459754/rehabilitation-after-medial-patellofemoral-ligament-reconstruction
#7
Terrence G McGee, Andrew J Cosgarea, Kevin McLaughlin, Miho Tanaka, Ken Johnson
Patellar instability resulting from subluxation or dislocation is a painful and commonly recurring condition. Retinacular restraints control patellar tracking, limiting the movement of the patella in the trochlear groove. The medial patellofemoral ligament (MPFL) is considered the main soft tissue stabilizer against lateral displacement. Few studies of patellar instability discuss rehabilitation after MPFL reconstruction. In this review, we discuss the phases of rehabilitation after MPFL reconstruction, typical interventions by rehabilitation specialists, and patient-specific guidelines for return to prior level of function...
June 2017: Sports Medicine and Arthroscopy Review
https://www.readbyqxmd.com/read/28459749/nonoperative-treatment-of-patellar-instability
#8
Sameer Dixit, Rajwinder S Deu
The treatment of patellar instability is challenging and typically begins with nonoperative methods. Clinical decisions are made on an individual basis and may vary according to a number of factors. First-time patellar dislocations most commonly occur during sports participation. Initial evaluation, including patient history, physical examination, and appropriate imaging, determines care. Although nonoperative treatment consists primarily of regressive immobilization and physical therapy, there is little evidence to support particular protocols for either...
June 2017: Sports Medicine and Arthroscopy Review
https://www.readbyqxmd.com/read/28459748/diagnosis-and-characterization-of-patellofemoral-instability-review-of-available-imaging-modalities
#9
Arya Haj-Mirzaian, Gaurav K Thawait, Miho J Tanaka, Shadpour Demehri
Patellofemoral instability (PI) is defined as single or multiple episodes of patellar dislocation. Imaging modalities are useful for characterization of patellar malalignment, maltracking, underlying morphologic abnormalities, and stabilizing soft-tissue injuries. Using these findings, orthopedic surgeons can decide when to operate, determine the best operation, and measure degree of correction postoperatively in PI patients. Also, these methods assist with PI diagnosis in some suspicious cases. Magnetic resonance imaging is the preferred method especially in the setting of acute dislocations...
June 2017: Sports Medicine and Arthroscopy Review
https://www.readbyqxmd.com/read/28458846/spontaneous-superior-patellar-dislocation-in-young-age-case-report-and-reduction-technique
#10
Noman Jahangir, Muhammad Umar
Superior patellar dislocation is a very rare pathology, which happens in middle age. We report a case of spontaneous superior patellar dislocation, which occurred at 30 years of age. Differential diagnosis is patellar tendon rupture, which could be reliably excluded by clinical examination and radiographs. Reduction manoeuvres should be tried with diluted intra-articular local anaesthetic for hydrodilatation to gain mechanical advantage. Splinting the knee in gentle flexion is recommended if general anaesthetic is employed...
March 2017: Journal of Surgical Case Reports
https://www.readbyqxmd.com/read/28454185/patella-dislocation-in-children-and-adolescents
#11
Sven Höhne, Kristina Gerlach, Lars Irlenbusch, Mathias Schulz, Christian Kunze, Rainer Finke
Introduction Patellar dislocation is one of the commonest knee injuries in adolescents. Although treatment usually leads to good results, the influence of anatomical and functional factors on therapeutic strategy has been underestimated, especially in cases of recurrence. Patients and Methods The course of treatment has been analysed in 88 patients with 136 patellar dislocations. The importance of anatomical conditions was studied using X-ray and MRI findings. The treatment results were critically evaluated in comparison with current recommendations...
April 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/28451595/medial-patellofemoral-ligament-repair-versus-reconstruction-for-recurrent-patellar-instability-two-year-results-of-an-algorithm-based-approach
#12
Jason L Dragoo, Michael Nguyen, Corey T Gatewood, Jacob D Taunton, Simon Young
BACKGROUND: Patellar instability remains a challenging problem for both the patient and surgeon. Medial patellofemoral ligament (MPFL) repair has historically had poor results, and due to this, there is currently a trend toward reconstruction. PURPOSE/HYPOTHESIS: This study was undertaken to investigate experience with repair versus reconstruction of the MPFL using a multifactorial treatment algorithm approach. Our hypothesis was that there will be no significant difference in outcome scores between patients in the MPFL repair and reconstruction groups...
March 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28447139/early-patellar-dislocation-can-lead-to-tibial-tubercle-lateralization-in-rabbits
#13
Yingzhen Niu, Pengkai Cao, Chang Liu, Jinghui Niu, Xu Yang, Fei Wang
PURPOSE: To investigate the effects of early patellar dislocation on the tibial tubercle location. METHODS: Sixty knees from 30 healthy 1-month-old New Zealand white rabbits were randomly divided into two groups of 30 knees each. Group A (control group) comprised the left knees, which underwent no surgical procedures. Group B comprised the right knees, which underwent patellar dislocation surgery. Computed tomography (flexion 0°) was performed preoperatively and 6 months post-operatively...
April 26, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28431451/-experience-with-the-hind-foot-relaxation-boot
#14
Hans Zwipp, Michael Borrmann, Eberhard Walter
The goal of this paper is to report our experience with hindfoot fractures using our specially developed boot, with a follow-up of 557 cases. This boot works like the well-known Allgöwer-Röck ortheses (ARO), but is a hybrid between a boot and an orthesis. It allows full weightbearing without using crutches and completely protects an acutely operated hind foot fracture, hind foot arthrodesis or a hind foot fracture which is suitable for conservative treatment. In its first generation, this boot was custom made and used in 408 cases, from March 1999 to February 2011...
April 21, 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/28427385/differences-between-native-and-prosthetic-knees-in-terms-of-cross-sectional-morphology-of-the-femoral-trochlea-a-study-based-on-three-dimensional-models-and-virtual-total-knee-arthroplasty
#15
Zhe Du, Shichang Chen, Mengning Yan, Bing Yue, You Wang
BACKGROUND: The cross-sectional morphology of the prosthetic knee is crucial to understanding patellar motion and quadriceps strength after total knee arthroplasty. However, few comparative evaluations of the cross-sectional morphology of the femoral trochlea have been performed in the native knee and currently available femoral implants, and the relationship between the trochlear anatomy of prosthetic components and post-operative patellofemoral complications remains unclear. We aimed to investigate the differences in cross-sectional morphology of the femoral trochlea between native knees and prosthetic femoral components...
April 20, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28409075/bilateral-patella-dislocation-after-total-knee-arthroplasty-a-report-of-two-cases-and-a-review-of-the-literature
#16
Raju Vaishya, Amit Kumar Agarwal, Sagar Panthi, Vipul Vijay, Abhishek Vaish
Patellar instability is a known but catastrophic complication after total knee arthroplasty (TKA). The occurrence of bilateral dislocation of the patella after TKA is exceedingly rare. It may present as anterior knee pain, and diagnosis can easily be made clinically or by plain radiographs. Early diagnosis with surgical realignment and repair of the extensor mechanism can provide good outcomes after this complication.
March 4, 2017: Curēus
https://www.readbyqxmd.com/read/28378138/q-vector-measurements-physical-examination-versus-magnetic-resonance-imaging-measurements-and-their-relationship-with-tibial-tubercle-trochlear-groove-distance
#17
Kristin H Graf, Marc A Tompkins, Julie Agel, Elizabeth A Arendt
PURPOSE: An increased lateral quadriceps vector has been associated with lateral patellar dislocation. Surgical correction of this increased vector through tibial tubercle medialization is often recommended when the quadriceps vector is "excessive". This can be evaluated by physical examination measurements of Q-angle and/or tubercle sulcus angle (TSA), as well as the magnetic resonance imaging (MRI) measurement of tibial tubercle-trochlear groove (TT-TG) distance. This study examined the relationship between three objective measurements of lateral quadriceps vector (TT-TG, Q-angle, TSA)...
April 4, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28378002/total-knee-arthroplasty-for-treatment-of-osteoarthritis-with-prolonged-patellar-dislocation
#18
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/28357492/patient-based-outcomes-after-medial-patellofemoral-ligament-reconstruction
#19
Takehiko Matsushita, Shinya Oka, Daisuke Araki, Kyohei Nishida, Toshikazu Tanaka, Noriyuki Kanzaki, Kotaro Nishida, Ryosuke Kuroda
PURPOSE: The purpose of this study was to evaluate subjective outcomes after medial patellofemoral ligament (MPFL) reconstructions. METHODS: Fifty-four knees of 46 patients who received MPFL reconstruction for recurrent patellar dislocations were examined with a minimum follow-up of two years. To assess patient-based outcomes, the Knee Injury and Osteoarthritis Outcome Score (KOOS) and the Kujala score were assessed. RESULTS: The mean Kujala score was significantly improved from 64...
March 29, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28353323/pediatric-patellar-dislocation-a-review
#20
Baobiao Gao, Yingchun Shi, Fengfei Zhang
Acute patellar dislocation affects approximately 1:1000 healthy children 9- 15 years of age, and up to 50% are at risk for recurrent dislocations. In adults the condition is associated with long-term complications, such as osteoarthritis and impairment of knee function. However, literature describing the outcome in a pediatric population is sparse. The present review article evaluate the long-term effects on knee function and cartilage quality after traumatic patellar dislocation in childhood, and also to evaluate the reliability of two clinical tests of medio-lateral knee position, in healthy children...
March 27, 2017: Minerva Pediatrica
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