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