I would guess its back muscles & disc problems. Most misalignment comes on or are felt as a numb hip or leg, with others as a quick shooting pain , as a pinched nerve or disc.
If I have the bent over at 45 degrees back "can stand up " I just leave it alone, as its more muscle spasms in the lower back / spine.

I have had great luck with Self chiro , putting you torso on a thick firm pad / pillow 6 - 8 inches thick, lay on one side with your knees together - legs bent & heels near your butt , ( like a laying down deep knee bend ). with the highest arm reaching straight behind you (to anchor -- hold a bed-dresser -- another person -- kid) this will hold you upper shoulders from turning. With your lower arm press on your bent knee cap gently, relax-exhale, you may push hard say 20 - 30 lb. on the knee.

You should feel a soft pop in the back/waist area, if not try the opposite side. Only your torso & feet should be on the pad, with most of your folded legs hanging over.

This is the same as a chiro would do,you just have less tension since your doing it. Try it only if you have pain that came out of nowhere, where you feel like you have a short leg / slight limp. The chiro throws his whole body on your knee, so your using a lot less pressure than that. There should be almost instant results to 5 minutes later .

Your basically twisting your vertebrae max left , max right , to get an even stack / center . Use at your own risk , worked on 20 people that I know, doing it.

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