The document provides an overview of common knee and patellofemoral joint injuries, including ligament injuries, meniscal injuries, patellar injuries, and other conditions that affect the lower extremity. It describes the mechanisms of injury, clinical presentations, physical exam findings, and treatment approaches for various injuries such as MCL sprains, ACL tears, patellar tendinitis, and chondromalacia patellae. Evaluation and management considerations are discussed for each condition.