Prevalence of Bipartite Patella in Turkish Population. Analysis of Bilateral Knee Radiographs in 897 Subjects

DOI : http://dx.doi.org/10.4067/S0717-95022015000300047
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Ozkan Kose; Ali Eraslan; Ali Ergun; Omer Faruk Egerci & Emrah Cevat Ercan

Summary

Bipartite patella is a normal anatomic variant of patella. There are various data about the prevalence of bipartite patella in the literature. The aim of this study was to investigate its prevalence, type distribution and sex predilection in Turkish population. Bilateral knee radiographs were retrospectively reviewed of 897 consecutive adult patients. Cases with bipartite patella were categorized according to the Oohashi classification. Medical records were examined in order to differentiate symptomatic and asymptomatic bipartite patellae. We contacted symptomatic patients by telephone to learn continuity of knee pain. We identified 11 cases (7 male, 4 female) of bipartite patella among the 283 male and 614 female patients. No bilateral cases were identified. The prevalence of bipartite patella was 1.22% overall, 2.47% in males, and 0.65% in females. The most common type was superolateral bipartite patella as seen in 9 patients (81.8%). One subject had lateral bipartite and one subject had superolateral tripartite patella. Painful bipartite patella was found in only 2 patients (18%). One of them had continuing symptoms even after 12 months. In conclusion, we found that the prevalence of bipartite patella in Turkish population was approximately 1%. Both inclusion of only adult (skeletally mature) subjects and assessment with bilateral imaging increased the reliability of this value. In accordance with the literature, bipartite patella was found significantly more frequent in males and mostly in superolateral type. More studies are needed in order to obtain the prevalence, type and sex distribution of bipartite patella in different populations.

KEY WORDS: Bipartite patella; Turkish population; Prevalence; Epidemiology.

How to cite this article

KOSE, O.; ERASLAN, A.; ERGUN, A.; EGERCI, O. F. & ERCAN, E. C. Prevalence of bipartite patella in Turkish population; analysis of bilateral knee radiographs in 897 subjects. Int. J. Morphol., 33(3):1108-1113, 2015.