In order to evaluate the relationship between bone pelvis measurements and erectile function in patients who underwent nerve-sparing robot-assisted radical prostatectomy, bone pelvis measurements will be measured from MRI images of the patients before the operation and their erection quality will be evaluated with the IIEF-5 form. The erection quality of the same patients will be evaluated with the IIEF-5 form in the 3rd and 6th months after the operation. And it will be evaluated whether there is a relationship between the erection quality of the patients before and after the operation and their bone pelvis measurements.

Inclusion Criteria:

• Having bilateral nerve-sparing robot-assisted radical prostatectomy operation
• Having a regular sexual life

Exclusion Criteria:

• Having received neoadjuvant therapy
• Having a history of radiotherapy to the pelvic area
• The need to receive postoperative hormono-radiotherapy

Preoperative Prostate MRI imaging was performed, "Bilateral Nerve Saving Robot Assisted Radical Prostatectomy Operation" was performed, and a regular sexual life was performed; Male patients who have not received neoadjuvant therapy, have no history of radiotherapy to the pelvic region, and do not need postoperative hormono-radiotherapy