Shin splints is an inflammation of the muscles, tendons, and bone tissue around the large bone in your lower leg (tibia) which is commonly known as the shinbone. The pain typically occurs toward the inner front of the bone between the knee and ankle where muscles attach to the bone. Shin splints frequently affect athletes who regularly engage in moderate to heavy physical activity in sports such as tennis, racquetball, soccer or basketball. Pain can be so severe that all sports activity must be halted.