Semra DURAN, Elif GÜNAYDIN, HATİCE GÜL HATİPOĞLU ÇETİN, Bülent SAKMAN

Bipartite Patella: Magnetic Resonance Imaging

Amaç: Bipartita patella insidental radyolojik bulgu olarak saptanır. Bu çalışmanın amacı kemik iliği ödemi bulunmayan bipartita patellalı olguların manyetik rezonans görüntüleme (MRG) bulgularını tanımlamaktır. Gereç ve Yöntemler: Toplamda 1,000 hasta retrospektif olarak değerlendirildi. Görüntüleme her hasta için diz koili kullanılarak standart diz protokolünde 1.5T MRG cihazında yapıldı. Görüntüler iki radyoloğun ortak görüşünde değerlendirildi.Bulgular: On sekiz hastanın altısı kadın, on ikisi erkekti. Ortalama yaş 42,1±23,5 yıldı. Bipartita fragmanların tamamı patellanın süperolateralinde yerleşimli idi. Fragmanın ortalama transvers çapı 11,6±8,1 mm idi. Aksiyal planda fragman ile komşu patella arasında ortalama mesafe 1,67±1,1 mm idi. Fragman üzerinde patellar kartilajın devamlılığı tüm hastalarda izlendi. Ortalama fragman kartilaj kalınlığı 1,9±1 mm ve patellar kartilaj kalınlığı 3,8±2,3 mm idi. Sinkondroz bölgesinde 10 dizde kartilaj sinyali, 6 dizde sıvı sinyali ve 4 dizde fibröz sinyal saptandı. Sonuç: Kemik iliği ödemi bulunmayan bipartita patella olgularının önemli özelliği, fragmanı kaplayan normalden ince kartilaj ve genellikle sinkondrosis bölgesinde saptanan kartilaj sinyalidir.

Bipartita Patella: Manyetik Rezonans Görüntüleme Bulguları

Objective: Bipartite patella is accepted as a normal anatomic variant of patella, and is identified incidentally on knee radiographs taken for other reasons. The aim of this study was to characterize the magnetic resonance imaging (MRI) features of bipartite patella without bone marrow edema.Materials and Methods: In total, 1.000 patients were evaluated retrospectively. Imaging was performed on 1.5T MRI unit using extremity coil. A standardized knee protocol was used. The obtained images were thereafter analyzed by two experienced radiologists in consensus. Results: Of the 18 patients, six were female and twelve were male. The mean age of the group was 42.1±23.5 years. The bipartite fragments were located in the superolateral aspect of the patella. In 16 knees, only one fragment was recognized. The average transverse diameter of the patellar fragment was 11.6±8.1 mm. In the axial plane, the average distance between the fragment and the main patella was 1.67±1.1 mm. Continuity of the patellar cartilage on the fragment was observed in all patients. The mean fragment cartilage thickness was 1.9±1 mm and the patellar cartilage thickness was 3.8±2.3 mm. Cartilage signal was present in ten knees, fluid signal was present in six knees, and fibrous signal was present in four knees in the synchondrosis region. Conclusion: A defining feature of bipartite patella without accompanying edema in the bone marrow is a thinner-thannormal cartilage covering the fragments, and an overall cartilage signal over the area of the synchondrosis

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