Hi im 16 years of age and i was playing football when i bust my fibia/shin bone in 3 places going 2/3 into the bone. I had a full leg cast on for 6 weeks and lately have had it put down to a weighted below knee cast for another 6 weeks. They told me i was to start walking in 3 days but i fell sharp pains wen i have my leg pointed straight and walk, feels like when pressure is put down in certain places e.g when leg is straight down or when is bent so much then i feel harsh quick pains. At first my muscles were tight and were hurting when bending leg but i have stretched the leg every night and is now getting better but these pains arent. No immflamation in the knee and all seems fine apart from that. Before i had done leg injury, i've always had fairly weak knees but wouldn't say it was a problem, just when getting up they both felt a little hard. Has been 2 days since switching to below knee cast and i can walk but in small steps. Also if i turn my knee or lift when turned i feel same sharp pain.