Although injury to the important stabilising cruciate ligaments and cartilages of the knee are less common in children and young teenagers it is possible particularly if there has been significant force applied to the knee eg. a rugby or football tackle or heavy twisting injury such as occurs in skiing and snowboarding. If a knee joint becomes significantly swollen almost immediately after the injury as opposed to hours or a day later then you should always be suspicious of damage to the cruciate ligaments, bone or shock absorbing cartilages. It is better to deal with the injury as soon as possible as resulting instability of the knee causes the bony surfaces of the knee joint to wear although a period of a few months is unlikely to do any serious lasting damage provided he is careful. While waiting for reconstruction surgery it is essential that your son tries to maintain good strength of the thigh and hamstring muscles as this will provide some stability and protection from further damage to the joint. Non weight bearing exercises such as controlled sitting knee extensions and hamstring curls or cycling are better than weight full bearing activities such as running. I would certainly advise avoidance of any contact sports or those which involve twisting and turning of the knee at the present time as further damage to the knee joint cartilages and bony surfaces could easily occur. It would be helpful to get instruction from a physiotherapist as to an appropriate exercise regime.
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