Even though glucosamine and chondroitin for osteoarthritis pain has not been shown to be helpful for all people, they may have also not been demonstrated to get damaging.  Patellar tendon tears entail the partial or complete rupture on the band of connective tissue that attaches the bottom on the kneecap (patella) https://www.theorthopaedicandpainpractice.com/do-i-have-a-knee-tendon-injury/?_gl=1*xbbxlb*_up*MQ..&gclid=Cj0KCQjwkt6aBhDKARIsAAyeLJ2krYJSOuy5mZksrNqH-VDjQwW1ScD49yD8BUWysDG6u6bJPCSbXVUaAuCPEALw_wcB