The hypothesis is men with stress urinary incontinence, including those following radical retropubic prostatectomy and other prostate surgery, have preoperative urethral mobility as measured by magnetic resonance imaging (MRI) that improves significantly following sling placement. The investigators theorize that the sling helps with primary hypermobility of this pathophysiologic cause of stress urinary incontinence.

Inclusion Criteria:

• The control group:
• normal male subjects
• The Intervention group:
• male
• with stress urinary incontinence
• 45 years or older
• history of prior radical prostatectomy
• complains of stress urinary incontinence
• scheduled for a transobturator sling surgery
• ability and willingness to provide written consent

Exclusion Criteria:

• absolute or relative contraindications to MRI
• claustrophobia
• inability to undergo the male sling surgery
• PI judgement

Absolute contraindications to MRI:

• electronically, magnetically, and mechanically activated implants
• ferromagnetic or electronically operated active devices
• metallic splinters in the eye
• ferromagnetic hemostatic clips in the central nervous system

Relative contraindications to MRI:

• cochlear implants
• other pacemakers
• nerve stimulators
• lead wires or similar wires
• prosthetic heart valves
• hemostatic clips
• non-ferromagnetic stapedial implants

Patients from the urology clinic.