Abstract
Purpose
Bipartite patella is a known cause of anterior knee pain. Our purpose was to detail the magnetic resonance imaging (MRI) features of bipartite patella in a retrospective cohort of patients imaged at our institution.
Materials and methods
MRI exams from 53 patients with findings of bipartite patella were evaluated to assess for the presence of bone marrow edema within the bipartite fragment and for the presence of abnormal signal across the synchondrosis or pseudarthrosis. Any other significant knee pathology seen at MRI was also recorded. We also reviewed 400 consecutive knee MRI studies to determine the MRI prevalence of bipartite patella.
Results
Of the 53 patients with bipartite patella 40 (75%) were male; 35 (66%) had edema within the bipartite fragment. Of the 18 with no edema an alternative explanation for knee pain was found in 13 (72%). Edema within the bipartite fragment was the sole finding in 26 of 53 (49%) patients. Bipartite patella was seen in 3 (0.7%) of 400 patients.
Conclusion
In patients with bipartite patella at knee MRI, bone marrow edema within the bipartite fragment was the sole finding on knee MRI in almost half of the patients in our series.
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References
Ogden JA, McCarthy SM, Jokl P. The painful bipartite patella. J Pediatr Orthop 1982;2:263–9.
Iossifidis A, Brueton RN, Nunan TO. Bone-scintigraphy in painful bipartite patella. Eur J Nucl Med 1995;22(10):1212–3.
Ogden JA. Radiology of the postnatal skeletal development. X. Patella and tibial tuberosity. Skeletal Radiol 1984;11:246–57.
Chung CB, Skaf A, Roger B, Campos J, Xavier S, Resnick D. Patellar tendon-lateral femoral condyle friction syndrome: MR imaging in 42 patients. Skeletal Radiol 2001;30:694–7.
Iossifidis A, Brueton RN. Painful bipartite patella following injury. Injury 1995;26(3):175–6.
Ireland ML, Chang JL. Acute fracture bipartite patella: case report and literature review. Med Sci Sports Exerc 1995;27(3):299–302.
Canizares GH, Selesnick FH. Bipartite patella fracture. Arthroscopy 2003;19(2):215–7.
Adachi N, Ochi M, Yamaguchi H, Uchio Y, Kuriwaka M. Vastus lateralis release for painful bipartite patella. Arthroscopy 2002;18(4):404–411.
Insall J. Current concepts review: patellar pain. J Bone Joint Surg Am 1982;64:147–52.