Hii, Having L4-L5 did space reduced is a very common finding on MRI. need to know how much the disc has protruded out and whether it is compressing any of your important neural structures around. The good news is that , with advanced therapy in physiotherapy called ' MDT' or McKenzie therapy ,such disc issues can be resolved completely. Along with following proper back ergonomics and core & back muscles strengthening exercises ,most of the patients live healthy and painfree life post therapy.