We aimed to get morphometric data of the proximal ulna, besides torsion angle, which is rarely found in the literature.In this study, 25 ulna (11 left, 14 right) found in the Anatomy Department laboratory were used. Eight morphometric parameters of the proximal ulna were measured. All dry bones were photographed using a ruler and transferred to the computer. Then, morphometric measurements were made with the help of Image-J analysis program.In our measurement we noted that the mean ulna length was 251.02 ± 16.23 mm and the mean ulna length except trochlear notch was 223.49 ± 15.52 mm. The mean radial notch width was 18.5 ± 3.38 mm, the mean radial notch height was 12.09 ± 1.70 mm, and the mean trochlear notch depth was 11.57 ± 1.73 mm. Mean torsion angle, dorsal angulation and varus angle were calculated respectively; 14.64 ± 8.36º; 5.94º ± 2.01º; 12.48º ± 2.425º. There was no statistically significant difference in any parameter in the comparison between the sides.The anatomical shape of the proximal ulna causes specific difficulties for implants used in humeroulnar arthroplasty. The fact that there is no difference between the right and left sides in all parameters in this study suggests that the knowledge of the opposite side ulna can be used in the appropriate prosthesis design. In addition, the results of this study will provide data on ulna dimensions in forensic and anthropological studies.