The incision, which can be done at a 90 degree angle from the vulva towards the anus or at an angle from the posterior end of the vulva (medio-lateral episiotomy), is performed under local anesthetic (pudendal anesthesia), and is sutured closed after delivery.
Hamstring hyperextension can occur during exercise and stretching. The hamstrings are a group of muscles found at the back of the thigh. Three muscles are in this group: the biceps femoris, the semitendinosus and the semimembranosus. The function of these muscles is to bend the knee and to extend the hip. It is common for these muscles to become hyperextended and injured.
Hamstring strain (pulled hamstring). Hamstrings are long muscles that extend down the back of the thigh. Because hamstrings work to pull back the leg and bend the knee, they can be injured during running, kicking or jumping. You may feel a pop, usually at the back of the thigh, when the muscle tears.