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Lateral patellar subluxation Radiology

Lateral patellar dislocation Radiology Reference Article

A focal lobulated mass with signal characteristics of fluid or cystic change can sometimes be present in the lateral soft tissues of the knee between the lateral femoral condyle and the lateral retinaculum. Associated findings of lateral patellar subluxation (6a) and/or patella alta are frequently present. 5a 5 Patellar Height: Insall-SalvatiRatio Applicable to lateral film, ideally withkneein30°flexion Normal with knee in 30 Measure the greatest diagonal length of the patella (B, yellow line) Ptll Measure the length of patellar tendon (A, red line) from the lowe

Knee dislocations are rare, but a significant number have a serious associated neurovascular injury. This article discusses the tibiofemoral joint dislocation. Please see separate articles for discussion of medial and lateral patellar dislocations Lateral patellar tilt Lateral patellar tilt is a sensitive marker for patellar instability [ 45 ]. It may occur without patellar lateralization. In a series of 474 patients with anterior knee pain, patellar tilt or subluxation was present in 40% of the cases on axial MRI [ 46 ] The importance of trochlear dysplasia first came to light in 1802, when the French surgeon Richerand noticed several cases of patellar dislocation in which the lateral femoral condyle was less prominent than usual. 2 Early radiographic attempts to assess the morphology of the trochlea employed axial radiographs of the knee

Patellofemoral instability Radiology Reference Article

Patellar instability - recurrent lateral patellar

Arthroscopic Lateral Retinacular Release | Musculoskeletal Key

Lateral release: A lateral release is a surgical procedure performed to loosen the pull of the tight ligaments and joint capsule on the outer side of the knee. While often the easiest surgical approach, it does the least to improve patellar alignment.   Medial ligament reconstruction: Repairing or reconstructing the ligaments on the inner side of the knee that pull the kneecap inwards. A lateral release is a surgical procedure on the knee used to realign the kneecap (patella). The lateral release is performed as an arthroscopic knee surgery and can be performed as an outpatient. The usual reason to perform a lateral release is to correct a partially dislocated ( subluxated) kneecap that is causing pain

Knee: Patellofemoral ligament and retinaculum injuries. Commonly occurs in lateral patellar dislocation. Sprain seen as stretching of the ligament with intact fibers and surrounding soft-tissue edema. Disruption seen as discontinuous, wavy fibers with adjacent high signal. Avulsion of the MPFL off of the adductor tubercle seen as fluid between. Proximal tibiofibular joint dislocation is most often caused by internal or external rotational stress on a flexed knee 1-5 which prevents additional support of the biceps femoris tendon and the lateral collateral ligament to the fibular head in this position 5. Many dislocations are associated with plantar flexion of the foot Objective: Transient lateral patellar dislocation is frequently difficult to diagnose accurately on the basis of clinical findings. Accordingly, we studied the MR findings in 26 cases to determine if MR imaging is useful in establishing the diagnosis. Materials and methods: A retrospective review of 1450 MR examinations of acutely injured knees was performed to determine the MR findings. Caton-Deschamps Index. In the Caton or Caton-Deschamps method, the vertical position of the patella is defined by the ratio of the distance from the inferior border of the patellar articular surface to the anterior border of the upper tibia (B) and the length of the patellar articular surface (A) ().The measurements are made on a lateral radiograph of the knee, which may be flexed between. A milder form of patellar dysplasia and malalignment with lateral deviation of the quadriceps mechanism is more common in adolescence and manifests as recurrent subluxation or dislocation (as happened in two other older patients who were referred for preoperative imaging but were not included in this series) . This type is often referred to as.

MR Imaging of Patellar Instability: Injury Patterns and

Transient Lateral Patellar Dislocation - Radsourc

Lateral patellar instability most frequently occurs in active females in the second decade of life [3]. Over half of cases of initial patellar dislocation are secondary to a sporting injury and MRI is indicated to assess for predisposing morphological factors, including trochlear dysplasia, patella alta and a raised tibial tuberosity. Transient patellar dislocation is a common sports-related injury in young adults. Although patients often present to the emergency department with acute knee pain and hemarthrosis, spontaneous reduction frequently occurs, and half of cases are unsuspected clinically. Characteristic magnetic resonance imaging (MRI) findings often lead to the diagnosis

Congenital dislocation of the patella is rare, and prevalence is not known. Although some studies have grouped it within a spectrum of conditions that include acquired irreducible dislocation before age 10 years (Gordon, 1999) and patellar instability, most agree that it is a separate entity Injury of the medial patellar retinaculum was seen at MR in each case. All patients had a joint effusion. Lateral subluxation of the patella was a common finding. CONCLUSION: Constant findings at MR imaging were (a) contusion of the lateral femoral condyle, (b) tear of the medial retinaculum, and (c) joint effusion. PMID: 8372201 [Indexed for. Patellar instability is a condition characterized by patellar subluxation or dislocation episodes as a result of injury, ligamentous laxity or increased Q angle of the knee. Diagnosis is made clinically in the acute setting with a patellar dislocation with a traumatic knee effusion and in chronic settings with passive patellar translation and a. In patients with patellar subluxation, however, the patella travels from a central position within the femoral trochlea at 30 degrees of flexion to a laterally subluxated position in full extension. The lateral excursion during terminal knee extension, referred to as the J sign, is pathognomonic of lateral patellar subluxation 188 CASE STUDY 8 PERSISTENT LATERAL PATELLAR SUBLUXATION WITH PATELLA ALTA History A 26 year-old male suffered from pain and Insall J, Salvati E (1971) Patella position in the Radiology 101: 101-104 4. Caton J, Deschamps G, Chambat P et al (1982) [Patella infera. A propos of 128 cases]

Patellar Fat Pad Abnormalities - Radsourc

Lateral trochlear inclination (LTI) of the knee was compared on magnetic resonance (MR) images obtained in 30 patients with patellar instability (PI) and 30 patients with nonspecific internal knee derangement. Differences in LTI values between the two populations were significant (P <.001). Repro Transient patellar dislocation is a common sports-related injury in young adults. Although patients often present to the emergency department with acute knee pain and hemarthrosis, spontaneous reduction frequently occurs, and half of cases are unsuspected clinically. Characteristic magnetic resonanc Figure 4. Technique for lateral knee image using a horizontal X-ray beam. Axial image. The axial image is also termed the sunrise image and provides information on the patellofemoral joint. Additionally, patellar pathology (fracture & subluxation/luxation in particular) can be identified Knee - Patellar fracture - AP. Hover on/off image to show/hide findings. Tap on/off image to show/hide findings. Knee - Patellar fracture - AP. A patella fracture may be very subtle; The presence of a joint effusion (haemarthrosis or lipohaemarthrosis) in the context of trauma is a helpful indicator of a fractur Osteochondral fractures were detected by plain radiography in 10% of pediatric patients presenting with lateral patellar dislocation and did not alter ED management. Pediatric patients with lateral patellar dislocations may be candidates for discharge from the ED after reduction without plain radiography

Lateral patellar instability is more frequent than medial instability. Fairbanks patellar apprehension test: It is positive when there is pain and muscle defensive contraction of lateral patellar dislocation with 20°-30° of knee flexion. The positive test indicates that lateral patellar instability is an important part of the patient's. This procedure can be effective if patellar instability is not present, pathologic lateral tilt is the major lesion in radiography, and the medial articular cartilage is intact. However, the vector direction of the lateral patellar retinaculum is posterolateral, and Desio et al.18) reported that the lateral restraining force was reduced by only.

  1. The hypermobile lateral meniscus is an entity that has received relatively little attention in the radiology or orthopaedic literature. Patients with symptomatic hypermobile lateral menisci present with knee pain and/or locking in the absence of a discrete meniscal tear or a discoid meniscus 18
  2. There are no contraindications to lateral patellar dislocation reduction. However, consultation with an orthopedic surgeon should be obtained prior to reduction if an associated proximal tibial or distal femoral fracture (including osteochondral fracture) is present
  3. These include injury of the medical retinacular cortex (medial patellofemoral ligament [MPFL]), lateral patellar tilt or subluxation, osseous contusions of the lateral femoral condyle and/or me- dial patellar facet, osteocondylar injury to either the lateral femoral condyle or medial patella, intrasu- bstance disruption within Hoffa's fat pad.
  4. Lateral patellar dislocation (LPD) is a common injury in children and adolescents, often leading to adult sequelae such as a lack of confidence due to recurrent instability and pain due to chondral damage. The contemporary approach to diagnosis and evaluation of this injury has centred on elucidation of anatomic risk factors, which are used to plan surgery when surgical stabilisation is warranted
  5. ation is necessary to be certain of the location of the cartilaginous.
  6. Conclusions In the setting of acute knee trauma, knee radiographs demonstrating a joint effusion and an intraar-ticular sliver-like osseous fragment correlate with recent lateral patellar dislocation. The routine trauma knee radiographic series does not include a patellar view but probably should, especially in young patients

Knee dislocation Radiology Reference Article

The objective of this work is to assess the prevalence of the sliver sign, defined as an intraarticular linear or curvilinear ossific density, in association with knee effusion in patients with acute knee trauma, as a predictor of recent lateral patellar dislocation (LPD). A retrospective radiology database search for the term 'patellar dislocation' on MRI knee exams performed at our. Patella Instability Dr. Tudor H. Hughes M.D., FRCR Department of Radiology University of California School of Medicine San Diego, California • Presentations: • Subluxation or Dislocation Patella Instability • Maltracking with Anterior knee pain Lateral Patellar Dislocation • Anteroposterior radiograph of the knee showing

This case illustrates typical findings in previous lateral patellar dislocation: medial patellofemoral ligament injury with a patellar avulsion fracture and a tear of the femoral origin. bone bruises at the typical locations at the inferomedial patella and the anterolateral margin of the lateral femoral condyle. a tear of medial retinaculum Acute lateral patellar dislocation at MR imaging: injury patterns of medial patellar soft tissue restraints and osteochondral injuries of the inferomedial patella Radiology , 225 ( 3 ) ( 2002 ) , pp. 736 - 74 Patella subluxation and patella dislocation can be grouped together as patellar instability. The difference is of degree and not of nature. Subluxation is an alteration of the normal tracking of the patella, but with the patella still within the femoral sulcus. Dislocation means that the patella has been completely displaced out of the sulcus Key Facts. Patellar fractures account for 1% of all skeletal fractures. The mechanism of injury is direct trauma (motor vehicle accidents 28%, falls 68%) or indirect trauma (4%), such as quadriceps contraction. Types of patellar fracture: transverse or oblique 34%; comminuted 16%; longitudinal 28%; apical or basal 28% Acute lateral patellar dislocation at MR imaging: injury patterns of medial patellar soft-tissue restraints and osteochondral injuries of the inferomedial patella. Radiology. 2002 Dec;225(3):736-43. ↑ Hergenroeder, Albert C., and Richard G. Bachur. Approach to acute knee pain and injury in children and skeletally immature adolescents

Patellar Dislocation. Severe subluxation with complete displacement of the Patella outside the trochlear groove. Patella does not spontaneously relocate. III. Epidemiology. Most common Knee Injury seen in children. More common in teenage girls and young women. Associated with increased Q-Angle (see below) IV Epidemiology. Patellar dislocation accounts for approximately 2 to 3% of knee injuries. This injury tends to affect young and active individuals, with adolescent females and athletes at a higher risk. Incidence is reported as 5.8 per 100,000 but could be as high as 29 per 100,000 in the adolescent population. [2 Transient lateral patellar dislocation: diagnosis with MR imaging. AJR Am J Roentgenol 1993;161:109-113. ↑ Ficat RP, Hungerford DS. Disorders of the patello-femoral joint. Williams & Wilkins, 1977. ↑ 8.0 8.1 Hughston JC, Walsh WM, Puddu G. Patellar subluxation and dislocation. WB Saunders Company, 1984 Related to patellar maltracking, there is impingement of the superolateral aspect of the infrapatellar fat pad (aka Hoffa fat pad) between the patellar tendon and the lateral femoral condyle. This finding can be subtle on MRI and can be missed by the radiologist. Narrative(s) A 32-year-old male presents with a history of chronic anterior knee pain Acute traumatic patellar dislocation is a common injury in the active and young adult populations. MRI of the knee is recommended in all patients who present with acute patellar dislocation. Numerous operative and non-operative methods have been described to treat the injuries; however, the ideal management of the acute traumatic patellar dislocation in young adults is still in debate

After Guepar arthroplasty lateral patellar dislocation was found in 32 knees, but pain was present in only three. There was only a questionable correlation between pre-existing valgus deformity and postoperative lateral patellar dislocation, and an external rotation deformity of the lower leg was found in only five cases after Guepar arthroplasty Anterior knee dislocation. This 30-year-old man was brought to the ED with a deformed left leg following a rugby tackle. It's difficult not to wince looking at these radiographs, which show a dislocated knee. Knee dislocation is an uncommon injury and requires fairly high-energy trauma; the majority of cases are seen following road traffic.

ABSTRACT : Transient lateral patellar dislocation is frequently difficult to diagnose accurately on the basis of clinical findings. Accordingly, we studied the MR findings in 26 cases to determine if MR imaging is useful in establishing the diagnosis Acute patellar dislocation accounts for 2% to 3% of all knee injuries 1 and is the second most common cause of traumatic knee hemarthrosis. 20 Acutely, osteochondral and chondral fractures of the medial facet of the patella and/or the lateral femoral condyle can be a common finding on radiographs, MRI, ultrasound, arthroscopy, and open procedures (). 5,12,16,18,23,38,46,49,52,55,56,64,65,67,68.

Prior lateral patellar dislocation: MR imaging findings. Prior lateral patellar dislocation: MR imaging findings. Lance, E; Deutsch, A L; Mink, J H 1993-12-01 00:00:00 Radiology L. Deutsch, MD #{149} Jerrold H. Mink, MD Prior Lateral MR Imaging Patellar Findingsâ Dislocation: PURPOSE: To illustrate the constellation of magnetic resonance (MR) findings that suggest prior patellar dislocation Passive Posterior Tibial Subluxation on Routine Knee MRI as a Secondary Sign of PCL Tear. Andrew J. Degnan,1,2 Catherine Maldjian,2 Richard J. Adam,1 and Christopher D. Harner3. 1Department of Radiology, University of Pittsburgh Medical Center, 3950 Presby South Tower, 200 Lothrop Street, Pittsburgh, PA 15213, USA Acute lateral patellar dislocation at MR imaging: injury patterns of medial patellar soft-tissue restraints and osteochondral injuries of the inferomedial patella Radiology , 225 ( 2002 ) , p. 73 Patellar instability is a spectrum of conditions ranging from intermittent subluxation to dislocation 1). Generalized patellar instability is thought to represent up to 3% of clinical presentations involving the knee. There are several varieties of patellar dislocation, as follows: Lateral - The most common type of patellar dislocatio ADVERTISEMENT: Radiopaedia is free thanks to our supporters and advertisers. Become a Gold Supporter and see no ads

There are several tests for patellar instability. a) The patella tilt test involves tilting the patella, which normally should be less than 20 degrees. b) With the knee flexed at 30 degrees, passive lateral and medial movement of the patella evaluates for possible dislocation or subluxation. This is referred to as the patellar glide test Acute Lateral Patellar Dislocation. This 14-year-old boy presented with acute knee pain and swelling following a basketball injury. The lateral radiograph (A) shows a joint effusion with an intra-articular ossific fragment JACOBSON G, ADLER DC. An evaluation of lateral atlanto-axial displacement in injuries of the cervical spine. Radiology. 1953 Sep; 61 (3):355-362. [Google Scholar] ADLER DC, JACOBSON G. Examination of the atlanto-axial joint following injury with particular emphasis on rotational subluxation An association between the patellar subluxation with both the chondromalacia patella and the patellar tendinopathy had been found by McNally et al. ; in our results, only 7% of the patients with patellar subluxation had MRI evidence of a chondromalacia patella and 7% had MRI evidence of patella Alta (Fig. 15) MRI of the knee demonstrates characteristic appearance of recent transient dislocation of the patella. There is bone marrow edema involving the medial side of the patella and lateral side of the femoral condyles with thickening and high signal seen in the medial retinaculum. In addition there is also a grade 1 strain of the medial collateral.

Patellar luxation (dislocation) is a condition where the knee cap rides outside the femoral groove when the knee is flexed (Figure 1). It can be further characterized as medial or lateral, depending on whether the knee cap rides on the inner or on the outer aspect of the knee respectively documented lateral patellar subluxation (as deter-mined through the KMRI procedure described be-low) were included. Subjects were excluded from the study if they reported previous knee surgery or acute traumatic patellar dislocation. Prior to participation, all procedures were explained and each subject provided written informed consent to the. to lateral patellar translation (which is the most common direction of displacement), especially beyond 20° of knee flexion. People who have a shallow trochlea are more susceptible to patellar instability. Proper stabilization of the patella is also affected by the soft tissue structures (ligaments and muscles) surrounding the knee. The media

Effect of lateral ligament reconstruction on intra-articular posterior cruciate ligament graft forces and knee motion. University of Washington Orthopaedic Research Report. 1996:37-41. 3 Larson RV, Metcalf MH.Surgical Treatment of Posterolateral Instability. In: Fanelli GC, ed. Posterior Cruciate Ligament Injuries: A Practical Guide to Management Medial patellar subluxation (MPS) is normally described following a lateral release. We report on a 14-year-old girl with MPS without previous lateral release. Arthroscopic examination demonstrated MPS at 0 and 30° of flexion, and the patella was tight in flexion on the lateral side. A low lateral release with a tibial tubercle transfer was performed, followed by repair of the lateral release. Patellofemoral instability is a clinical syndrome due to morphologic or dynamic changes in patellofemoral joint that lead to anterior knee pain and predispose to recurrent lateral patellar dislocation. It is more common in young females in the second decade of life due to ligament laxity [1] Acute lateral patellar dislocation at MR imaging: injury patterns of medial patellar soft tissue restraints and osteochondral injuries of the inferomedial patella. Radiology 2002; 225:736-743 [Google Scholar Patella Dislocation, Lateral. To reduce it, apply a medially directed pressure on the patella while extending the leg. - It is usually simple to reduce a lateral patellar dislocation, and these injuries rarely require acute surgical management. The proper technique is to have the patient sit or lie with the leg in a flexed position and then.

Patellar maltracking: an update on the diagnosis and

  1. Learning radiology of knee injury covering fractures of the tibia and patella - Lower limb X-rays - Knee fractures as seen on X-ray, Fractures of the tibial plateau. Patella fracture - X-ray appearances. Lipohaemarthrosis x-ray appearances. Knee joint effusion with haemarthrosis
  2. Patellar Dislocation - Emergency Department. 1. Summary. Dislocation of the patella is a relatively common injury in the active adolescent population and usually a traumatic event associated with either an awkward fall or direct trauma to the patella itself. Almost all dislocations are lateral in nature and are most easily reduced by simple.
  3. Most will regain full use of a stable knee; Posterior and Lateral Dislocation of Knee. The tibia is displaced laterally and posteriorly relative to the femur (red arrow). The patella is displaced laterally (black and white arrows) and comes to lie over the lateral femoral condyle
  4. Severe lateral subluxation Locking Sometimes between extension and 30 flexion Patellar position, contracted, 0 Lateral dislocation Range of motion Decreased in flexion, painful Patellar position, 30 Lateralization, subluxation and patellar tilt Radiographs Dysplastic trochlea, severe patellar subluxation Patellar mobility Increased to lateral
  5. Knee: Anatomy: Patellar ligaments and tendons. Most important stabilizing structure of the patella preventing lateral subluxation. Low-signal-intensity band extending from the superior pole of the patella to the adductor tubercle. On axial images, located just deep to the vastus medialis obliquus muscle. Arises from midpole of patella
  6. The primary passive restraint in patella instability is the Medial Patellofemoral Ligament (MPFL) which accounts for 60% +/- 13% of lateral restraint with the knee at 20 degrees of flexion [].Isolated release of the MPFL will result in 50% increase in lateral subluxation of the patella [].The MPFL is located anterior to and in a distinct extra-articular layer from the medial joint capsule
  7. Knee dislocations are high energy traumatic injuries characterized by a high rate of neurovascular injury. Diagnosis is made clinically with careful assessment of limb neurovascular status. Radiographs should be obtained to document reduction

Trochlear Dysplasia - Radsourc

Patellar dislocations. Annual patellar dislocation rate is approximately 43/100,000 (Brown, 2006). The majority are lateral. Superior, medial and intra-articular dislocations are uncommon. Young athletes suffer patellar dislocations more commonly than any other group, and the average age of occurrence is 16-20 years Malghem, J, Maldague, B. Depth insufficiency of the proximal trochlear groove on lateral radiographs of the knee: relation to patellar dislocation. Radiology. Radiology. 1989 ;170(2): 507 - 510 Background:In the knee joint, predisposition for patellar instability can be assessed by an abnormal Insall-Salvati index, tibial tuberosity-trochlear groove (TTTG) distance, and abnormal shape of.

We report a case of bilateral, permanent subluxation of the lateral meniscus. To our knowledge, the present case is the first reported description of bilateral irreducible anterior dislocation of the posterior segment of the lateral meniscus. This disorder is characterized by a flipped meniscus sign of the lateral meniscus on sagittal magnetic resonance images of the knee joint, with no. Lateral Knee Dislocation. Fig.1 Lateral knee dislocation shown on plain radiograph of a 43-year-old man who fell from height. A bony fragment is noted (red arrow) in the lateral tibiofemoral compartment. Fig. 2 CT femoral angiography was performed after relocation of knee dislocation to exclude popliteal artery injury Peroneus Brevis Split Tear and Lateral Subluxation of Lateral Moeity. Posted by Radiologist at 8:47 AM. Email ThisBlogThis!Share to TwitterShare to FacebookShare to Pinterest. Labels: MRI , MSK , Peroneus Brevis , Split Tear. Newer Post Older Post Home

Management of ACL Elongation in the Surgical Treatment ofPatellar dislocation with trochlear dysplasia | ImageKnee MRI | Radiology Key

Patellofemoral Disorders Radiology Ke

AbstractObjectivesThe purpose of this study was to compare the diagnostic performance of high-frequency ultrasound with MR in the evaluation of medial patellofemoral ligament (MPFL) lesions after acute lateral patellar dislocation (LPD).MethodsHigh-frequency ultrasound and MR images were prospectively obtained in 97 consecutive patients with acute LPD Medial dislocation of the patella is a previously unreported entity. This disorder can be disabling to the patient and may require a hospital visit for reduction. Three cases are presented in this article in which computed tomography demonstrated the dislocation. All three patients had undergone a lateral retinacular release to the involved knee for treatment of chronic knee pain or recurrent. Patellar (kneecap) dislocations occur with significant regularity, especially in younger athletes, with most of the dislocations occurring laterally (outside). When these happen, they are associated with significant pain and swelling. Following a patellar dislocation, the first step must be to relocate the kneecap into the trochlear groove Medial patellar ossification correlates with a history of prior patella subluxation and/or dislocation. The medial ossification can be seen within the MPFL or the medial joint capsule, suggesting remote injury to these structures. The presence of this lesion will prompt physicians to evaluate for patellar instability This model demonstrates a high risk of lateral patellar redislocation when a patient presents with skeletal immaturity as well as magnetic resonance measurements of sulcus angle ≥154° and patellar height as measured by Insall-Salvati ratio ≥1.3. A patient will have a low risk of lateral patellar redislocation with the inverse findings

[Radiology of patellar instability: contribution of the

Figure 3 (A) Following patellar dislocation, this radiograph shows a thin line (arrow) from an osteochondral fracture. (B) Axial view of the patella in a different patient demonstrates tiny bony fragments (arrow) following lateral patellar dislocation. Figure2 (A)Axialfat-suppressedproton-densityweightedMRofthe knee post patellar dislocation Transient Lateral Patellar Dislocation: DiagnosiswithMRImaging Michael D. 1,2 Steven W. tz1 Harold Friedman3 LeeF.Rogers1 Received November 30,1992;accepted after revision February 12,1993. Presented attheannual meeting oftheAmen-canRoentgen RaySociety, Orlando, FL,May 1992. 1Department ofRadiology, Northwestern Me Acute patellar dislocation (APD) is associated with a spectrum of soft tissue and osteochondral injuries. Based on multiple studies demonstrating similar functional outcomes after both conservative and operative procedures for treatment of APD, Conservative treatment has been traditionally the preferred option for APD without an osteochondral fracture (OCF) [1,2,3,4,5,6,7,8] Congenital Dislocation of Patella is a rare congenital knee condition that presents with an irreducible, lateral dislocation of the patella. Diagnosis is confirmed clinically with genu valgum, knee contractures and presence of a patella that is dislocated posterolaterally. Treatment is surgical reduction and stabilization in majority of cases PURPOSE: We sought to develop a new MRI-based measurement to assess the relationship of the extensor mechanism to the trochlear groove in patellar instability. METHODS: After obtaining approval from our institutional review board, we queried radiology records for patients from 2005-2014 who carried a diagnosis of a patellofemoral dislocation and had a knee MRI

Sliver sign (patella) Radiology Reference Article

  1. Acute lateral patellar dislocation at MR imaging: injury patterns of medial patellar soft-tissue restraints and osteochondral injuries of the inferomedial patella. Radiology. Radiology. 2002 ;225(3): 736 - 743
  2. Patellar instability and dislocation may be seen in young, active individuals following a traumatic event or chronically from generalized ligament laxity. Patellar instability may occur from coronal, rotational misalignment, patella alta, trochlea dysplasia, tight lateral structures, or damage to the medial patellofemoral ligament (MPFL), the.
  3. Lateral patellar dislocation: Edema of lateral femoral condyle is located more anteriorly and peripherally. Pivot shift injury: Edema of lateral femoral condyle is located more centrally or posteriorly. With less flexion, the femoral edema is located more anteriorly, but it will be associated with edema of the posterior tibial plateau rather.
  4. Patella dislocation. The vast majority of patella dislocations occur in a lateral direction. This disrupts the medial retinaculum and medial patellofemoral ligament, creating a haemarthrosis. The medial patellofemoral ligament is the primary stabiliser in early knee flexion. At this point in knee flexion, there is less bony contact between the.
Transient Lateral Patellar Dislocation - Radsource
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