en جراحی دست / آرنج Hand surgery / Elbow پژوهشی Research Article <div style="text-align: justify;"><strong>Background:</strong> Lunate morphology has been associated with several wrist pathologies. In this study, we aimed to find how lunate morphology (absence or presence of hamate facet) affects the severity of Kienb&ouml;ck disease.<br> Objectives: Evaluation of the relationship between lunate morphology and kienbocks disease.&nbsp;<br> <strong>Methods:</strong> A total of 106 patients with stage IIIA or IIIB of Kienb&ouml;ck disease at initial presentation were included in this study. Modified Litchman classification system and standardized lateral radiographs were used for staging the Kienb&ouml;ck disease. Lunate morphology was investigated on plain radiograph and computed tomography scan or magnetic resonance imaging and was classified into type I (absence of hamate facet) and type II (presence of hamate facet).<br> <strong>Results: </strong>The mean&plusmn;SD age of the patients was 33.5&plusmn;9.2 years. Kienb&ouml;ck disease stage IIIA and IIIB were identified in 68 (64.2%) and 38 (35.8%), respectively. Hamate facet was present in 65 (61.3%) patients and absent 41 (38.7%) patients. A significant association was found between lunate morphology and stage of disease so that the number of patients with lunate type I was significantly more in stage IIIB and number of patients with lunate type II was significantly more in stage IIIA (p<0.001).<br> <strong>Conclusion:</strong> Lunate morphology is associated with the severity of Kienb&ouml;ck disease in patients initially presented with stage IIIA or IIIB. These associations could be implicated to prevent disease progression as well as to optimize the outcome of treatment.&nbsp;</div> Kienböck disease, Lunate morphology, Hamate facet 13 18 http://jros.iums.ac.ir/browse.php?a_code=A-10-665-3&slc_lang=en&sid=1 Hooman Shariatzadeh shariatzadeh_h@hotmail.com 10031947532846004037 10031947532846004037 No Department of Orthopedic Surgery, Bone and Joint Reconstruction Research Center, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran. Farid Najd Mazhar fnajdmazhar@yahoo.com 10031947532846004038 10031947532846004038 No Department of Orthopedic Surgery, Bone and Joint Reconstruction Research Center, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran. Hanon Sadony dr.sadony@gmail.com 10031947532846004039 10031947532846004039 Yes Department of Orthopedic Surgery, Bone and Joint Reconstruction Research Center, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran. Nima Bagheri nima.bagheri56@gmail.com 10031947532846004040 10031947532846004040 No Department of Orthopedic Surgery, Bone and Joint Reconstruction Research Center, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran.