If someone has a knee reconstruction is it possible for them to play sports that they did before?

Yes, but depends on: Final outcome of surgery will depend upon the degree and nature of the problem, and as determined by ortho. Ligament reconstruction 2-8 wks. Amount and intensity of weight bearing, returning to work, kind & intensity of activity/sports, may be few weeks. If cartilage gone, full recovery-never. May have to avoid spec sport, limit to low impact, change lifestyle. Follow-up with ortho will determine.