All of the following statements are true for episiotomies except:

The bih canal is the path made by the pelvic curve through the planes of inlet mid pelvis and outlet, to be taken by the baby, while the vulva is the opening of the bih canal on which the episiotomy is given. An episiotomy will therefore not increase the size of the bih canal per se, but only widen the perineal outlet to facilitate delivery of the baby in conditions like a tight perineum, shoulder dystocia, breech delivery, and prior to application of forceps etc. Involvement of the anal spincter is seen in third degree tear. Type III and IV constitute the Complete Perineal tear. Mid-line episiotomies bleed lesser and heals better but can extend into anal sphincter easily. There are 2 main types- mid-line and medio-lateral episiotomy