Lower back pain. In awkward leg moments!

Im suffering from back pain from 1 month . But the pain has reduced and it doesn't affect my lifestyle but im a athelete and this lower back pain was witnessed while Playing continuous badminton and after the pain got worst I stopped playing and then I took a proper rest but after that when I resumed to play then I started witnessing pain after a moment I started . Then I counsltated a Ortho specialist then he recommended me to take a X ray and I took it then the X ray showed no bony abnormalities then my doctor recommended me to do IFT physiotherapy for 5 days then after 5 days I gone to play then also after some moments I witnessed pain after that I again revisted the Ortho specialist then he told me to take a MRI and took the MRI of my lumbar sacral spine . Then in that the report came normal it showed no significant pain then he told me continue IR therapy and I undergone this for 5 days still there were no results . Now the pain only resist when i bend and in awkward leg moments