of the tibia (shin bone), where the patellar tendon from the knee joins it.SymptomsYou are probably aged between 10 and 14, play a variety of sports, and have developed a painful bony swelling below the knee. It will hurt with strenuous activity, particularly

will be painful. Outward movement of the hip will be restricted by spasm and pain. Complete ruptures are uncommon.Medical investigationThe simple test of the doctor trying to part the knees while the patient is lying flat is usually the only investigation required

excessive uphill running, in which the tibialis anterior muscle expands and may produce fluid which stretches the compartment sheath. Signs An experienced sports physician will locate the pain between the tibia and fibula and may sense increased pressure

.Symptoms As well as the pain, you may feel the ankle is a little swollen and becomes progressively more uncomfortable as you point your toes, or turn them in, out or upwards. Sometimes you can pinpoint the exact spot; sometimes it’s more evasive.Signs A doctor

. Injury, in the form of a rupture, may be due to an accident in everyday life, or as a result of sporting trauma. If a tear occurs, nine times out of 10 it will be in the anterior cruciate ligament (ACL).SymptomsYou are likely to have twisted your knee