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