Considering the symptoms your friend is experiencing, it is obvious that there is something ‘wrong’. The break may have healed but has obviously caused further damage in the area. Alternatively, the break may have not healed properly although it is not detected in the x-ray. I would advise that you seek a second opinion and consult with an orthopedic surgeon as your friend requires specialist treatment and further investigation. Attempting to cope with this problem in the way he has done thus far can further complicate the condition and eventually reach a stage where the problem cannot be treated.
Only about 10 - 15% of meniscus tears are repairable, and in most of those cases the meniscus is repaired along with other tissue in the knee (MCL or ACL). If your orthopedic surgeon has decided that you qualify for a meniscal repair procedure, your surgeon may fix your meniscus with one of the 3 techniques available to fix a meniscus tear:
Keep in mind that using enanthate this way will cause a significant build up of testosterone in the bloodstream that will not cease to increase until four or five weeks of injections. This is due to the fact that taking a four hundred milligram injection, and another four days later, still has at least 200mg working from the previous dose. The third injection then adds another four hundred and the first is still not entirely used up. You may realistically have over a gram or so in the bloodstream before you know it. Just be careful, and keep this in mind when figuring out your dosages.