Knee injuries can be caused by slip and falls, blows to the leg or body, car accidents, motorcycle accidents and construction accidents. An accident with enough force can result in fractures, as well as trauma to the muscles, ligaments and tendons, including: • Anterior cruciate ligament (ACL) tears • Posterior cruciate ligament (PCL) tears • Medial collateral ligament (MCL) tears • Meniscus tears (tear to the knee cartilage) • Quadriceps tendon tears • Proximal tibia fractures (break of the lower leg bone in the knee joint) • Patellar fractures (broken kneecap) In addition to fractures and tears, cumulative trauma injuries can affect the knees. Overuse and repetitive motions such as lifting or carrying heavy items, operating heavy equipment and walking on uneven surfaces can cause injuries. A cumulative trauma injury can cause pain, burning, discomfort, tingling, numbness or reduced range of motion that may be significant enough to prevent you from working or doing daily tasks.