The Iliotibial band (IT band) is a tough band of tissue that extends from the surface of your respective hip to the skin of one's knee. Achilles Tendinitis: An overuse injury of the Achilles tendon, the band of tissue that connects calf muscles behind the reduced leg to the heel https://www.theorthopaedicandpainpractice.com/do-i-have-a-knee-tendon-injury/?_gl=1*xbbxlb*_up*MQ..&gclid=Cj0KCQjwkt6aBhDKARIsAAyeLJ2krYJSOuy5mZksrNqH-VDjQwW1ScD49yD8BUWysDG6u6bJPCSbXVUaAuCPEALw_wcB