Final answer:
The most common complication after a radical hysterectomy and lymphadenectomy is urinary incontinence, due to impacts on bladder-controlling nerves and muscles, and alterations in pelvic anatomy.
Step-by-step explanation:
The most common complication of radical hysterectomy and lymphadenectomy is urinary incontinence. These surgeries involve the removal of the uterus and surrounding tissues, including lymph nodes, which can affect the nerves and muscles that control bladder function, leading to urinary incontinence. Furthermore, the procedures can cause changes in pelvic anatomy that contribute to this condition. It's important for patients to be aware of this risk so they can discuss potential preventive measures and treatments with their healthcare provider.