To describe the main anatomic risk factors for lateral patellar dislocation and their features in children. To demonstrate the methodology for their measurement in various types of studies (x-ray, CT, MRI) and justify the appropriateness of using one or another method. To assess the impact of measurement results on further treatment tactics and prognosis.

Lateral dislocation of patella is a common knee injury in children and adolescents. Patellar dislocation is more common among girls [11], as well as among active adolescents and young athletes [2]. The lateral patellar dislocation is a severe damage. The treatment of primary dislocation in children is predominantly conservative [15] However, the probability of re-dislocation in this case is about 36% over the next 20 years [6]. Chronicpatellofemoralinstability leads to the development of patellofemoral arthrosis, persistent pain, limitation of physical activity and decrease in quality...

The injured knee joint is examined using an X-ray in standard projections,CT and MRI. Data from all three imaging modalities are used to analyze anatomical risk factors.The most significant predictors of dislocation are femoral trochlear dysplasia, patella alta, tibial tuberosity lateralization, increased lateral patellar tilt. Femoral trochlear dysplasia Femoral trochlear dysplasiais most often and important predictor of recurrent dislocations and unsuccessful surgical treatment. The classification of trochlear dysplasia by Dejour [7] is widely known. The assessment in this classification is based on the analysis of...

The assessment of patellar dislocation predictors is an important part of the diagnostic algorithm. The main risk factors to be studied by imaging methods are trochlear dysplasia, patella alta, tibial tuberosity lateralization and increased patellar tilt. For various factors, there are different preferred imaging modalities. The presence, severity and combination of risk factors may affect the patient's further prognosis in terms of redislocations and the choice of surgical treatment. Skeletal immature patients have morphological features that can change with growth, which explains the differences in...

T. Kostikova; Moscow/RU - nothing to disclose I. Melnikov; Moscow/RU - nothing to disclose M. Akhlebinina; Moscow/RU - nothing to disclose M. Ublinskiy; Moscow/RU - nothing to disclose T. Akhadov; Moscow/RU - nothing to disclose

Aglietti P, Buzzi R, Insall J. Disorders of the patellofemoral joint. In: Insall J, Scott W, eds. Surgery of the Knee, 3rd ed. New York, NY: Churchill Livingstone; 2001:913–1042. Arendt EA, Fithian DC, Cohen E (2002) Current concepts of lateral patella dislocation. Clin Sports Med 21:499–519. Askenberger M, Janarv PM, Finnbogason T, Arendt EA. Morphology and anatomic patellar instability risk factors in first-time traumatic lateral patellar dislocations: a prospective magnetic resonance imaging study in skeletally immature children. Am J Sports Med. 2017;45(1):50-58 Balcarek P, Oberthur...