"...Osgood-Schlatters disease also known as tibial tubercle apophysitis is a condition characterized by the anterior knee due to inflammation of the apophysis and apophysis is a normal developmental protuberance from a bone that provides an insertion site for tendons in this case the patellar tendon on to the tibial tubercle it primarily affects children and adolescents because by adulthood the apophysis will fuse with the rest of the tibia it is weaker than 10 and so is prone to injury Osgood-Schlatters disease is a stress or traction injury that occurs due to repetitive Force being applied through the strong patellar tendon on to the tibial tubercle typically from movements involving leg extension such as running or jumping but also during growth spurts the force can lead to small avulsion fractures of the tibial tubercle apophysis generating and pain and in rare cases a complete avulsion of the tibial tubercle knee pain is the most common symptom which is on the anterior portion of the knee just below the patella in most cases it is unilateral but both sides are affected in around 30 percent of cases in general it has an Insidious gradual onset with no trauma and may initially be episodic but go on to become continuous the tibial tubercle itself can be tender to touch and may have some Associated enlargement which can be felt as a prominent lump males in particular are up to seven times more likely to be affected..."
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