ÖzetOsteonekroz, kemige olan kan akiminin kesilmesinden dolayi kemigin ölümü olarak tanimlanir. Kienböck hastaligi, el bileginin hiperekstansiyon zorlamasi sonucu gelisen lunat kemigin osteonekrozudur. Sag el bileginde agri, sislik ve hareket kisitliligi sikayetleriyle klinigimize basvuran 39 yasindaki erkek olguyu, bu yakinmalarla gelen hastalarda ayirici tanida Kienböck hastaligi da düsünülmesi gerektiginden dolayi sunmayi planladik.  Hastanin, sag el bilegi radyografik incelemesinde; lunat kemikte skleroz, kistik lezyonlar ve düzensizlik saptandi. Manyetik rezonans görüntülemede (MRG), lunat kemikte kontür düzensizligi ve volüm kaybi, T1 agirlikli serilerde hipointens, T2 agirlikli serilerde diffüz kemik iligi ödemi ile uyumlu hiperintens görünüm izlendi. Bu bulgular lunat kemikte osteonekrozla uyumlu degisiklikler olarak belirlendi. Hastaya, istirahat splinti verilerek antiinflamatuar tedavi baslandi ve hasta Ortopedi-Travmatoloji bölümüne konsülte edildi. Ameliyat önerisini kabul etmeyen hastanin üç hafta sonraki kontrolünde; agri, sislik ve hareket kisitliligi yakinmalarinda azalma oldugu belirlendi. Sonuç olarak; el bileginde agri, sislik ve hareket kisitliligi yakinmalari ile gelen hastalarda, ayirici tanida osteonekroz göz önünde bulundurulmalidir. (Osteoporoz Dünyasindan 2009;15:26-8)Anahtar kelimeler: Osteonekroz, Kienböck hastaligiSummaryOsteonecrosis is defined as the death of bone due to interruption of the blood supply to the bone. Kienböck’s disease is osteonecrosis of lunate bone as a result of heavy repetitive loading on wrist. We planned to present a 39-year-old patient having pain, swelling and limitation of range of motion (ROM) in right wrist, because Kienböck’s disease should be into account in differential diagnosis of such patients. X-ray of the right wrist of patient demonstrated sclerosis, cystic appearance and irregularity in lunate bone. Irregularities, loss of volume and diffuse low-intensity appearance were observed in lunate bone on T1-weighted MR images. T2-weighted fat-saturated MR images demonstrated diffuse hyperintensity in the same areas which is suggested bone-marrow edema. These findings were determined as the changes with related osteonecrosis of the lunate bone. Resting splint and antiinflammatory treatment were given to the patient. The patient was consulted to the department of orthopedics and traumatology. Patient refused operation. Pain, swelling and limitation of ROM of the patients improved after 3 weeks. In conclusion, Kienböck’s disease should be into account in the differential diagnosis of patients having pain, swelling and limitation of ROM in wrist. (From the World of Osteoporosis 2009;15:26-8)Key words: Osteonecrosis, Kienböck’s disease