Carolyn is a 36 year old mother of 3 young children. She had an accident while skiing. After 4 months, she is still experiencing pain in her right knee and is walking with a limp. Carolyn visits the orthopedic physician and is told she needs an arthroscopy examination. While doing the arthroscopy, the physician also removes scar tissue in her knee joint. The follow-up care require intensive physical therapy. What leg muscles were affected by Carolyn's injury?