What Could Cause Sudden Severe Pain In My Right Foot, Knee, And Buttock That Makes My Leg Give Out While Walking?

When I walk I have an issue where I will experience severe pain in my leg that causes my whole leg to give out. All at once I feel a quick stab like pain in the top of my right foot along with extreme pain just around the bottom of my right knee coupled with pain in my right butt check equivalent to getting kicked by a horse. And everytime I try to walk and move I have all those pains hit at once and makes my whole leg give out from underneath me.