Introduction Caput radii fractures vary from non-dislocated to complex comminuted fractures and are oftenclassified by the Mason Classifications system from 1954. Most caput radii-fractures aresuccessfully treated non-surgical although some need surgery. Several surgical methods havebeen developed and surgical treatment is increasing. Aim Primary aim is to assess the Mason classification correlation to choice of treatment.Secondary aims are to describe the epidemiology, treatment frequency including surgical andnon-surgical as well as reoperation rate. Results Correlation between Mason classification and surgical/non-surgical treatment showed asignificant positive correlation (rs=0.403, p<0.001). Of 315 patients 95.2% were treated nonsurgical,4,8% received acute surgery. The estimated incidence was 3.25 per 10 000 per year,for women 4.09 and men 2.41 per 10 000 per year. Median age was 49 years (IQR 33-60), 54for women and 36 years for men respectively. Of the patients with Mason I did 0.4% receiveacute surgery, Mason II 3.4%, Mason III 66.7% and Mason IV 36.4%. Multiple surgicalmethods were used, Open reduction and internal fixation with plate and screw was mostfrequent. Four patients in the surgical treatment-group (23.5%) were reoperated. Two patients(0.7%) had late surgery due to complications. Conclusions Surgical treatment was more often used in more advanced fractures according to the Masonclassification although the correlation was fair and there were patients in each class that weresurgery treated. Surgical methods varied and reoperation rate was high. Women had higherincidence and a higher median age then men at time of injury.