Abstract
Patellar contusions are very common among the pediatric population. Contusions are most frequently caused by direct blunt-force trauma during casual play or organized sports. Patellar contusion is usually radiographically occult. The hyperemia and increased edema in the subchondral bone can be visualized on T2-weighted magnetic resonance imaging. Although complications can arise, patella contusions are typically self-limiting and resolve with appropriate conservative care. Patient education, activity modification, and pain management are cornerstones of treatment. The overwhelming majority of patients will return to play at their previous level once recovered from a patella contusion. Patellar contusion is occasionally complicated by prepatellar bursitis or patella fracture. Patellar subluxation also produces a characteristic pattern of patellar marrow edema, which usually distinguishes it from patella contusion, especially with supporting history and exam findings. Due to delayed or abnormal fusion of the secondary ossification centers, a bipartite or tripartite patella may be seen in the pediatric population. Although this abnormality is typically asymptomatic, a bipartite patella can become painful with overuse or after direct trauma. Care should also be taken in the clinical setting to distinguish a bipartite patella from an acute fracture.
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Ulmer, C.J., Nye, N.S. (2021). Patellar Contusion. In: Coleman, N. (eds) Common Pediatric Knee Injuries. Springer, Cham. https://doi.org/10.1007/978-3-030-55870-3_7
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DOI: https://doi.org/10.1007/978-3-030-55870-3_7
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