Assessment of the effects of autologous muscle-derived cell injections on urethral sphincter morphometry using 3D/4D ultrasound.

Significant increases of sphincter volumes as well as reduction of stress IEF occurred among the AMDC and placebo injection groups with no between-group differences at 12 months. A longer urethral length and a larger external sphincter volume at baseline were identified as potential predictors of AMDC injection response.