hi
couldnt agree more with ramywhite. specially with the physio statement. even if you wearing a brace (what you hopefully do) you are not allowed to fully weight bear for the first 4-6 weeks. weight bear only that it is pain free or half of your body weight. a flexion of 90 deg. is to much as well, 60 deg. for the first 4 weeks is indicated. another thing is it a patella tendon or semitendinosus tendon reconstruction??
for mobilisation try to flex your knee actively with heel on ground up to 60 deg. and extension as close to full as possible without pain. use isometric contractions for quads and hamstrings. exercise your abductors in side laying and lifting your leg up. and from same position bend knees 60 deg. and lift the upper knee up, but the foot stays on the other. its important to keep strength of you hip/pelvic muscles for the gait without cruches. also keep core stability.
the decrease pain and swelling use iceing and elevation and REST. (RICE)
Most important is to find a therapist how knows what he is doing and telling you. Because the different stages of wound healing/soft tissue healing and rehab are very important.
good luck