Hi - sorry to get narrow here...
When you straighten your leg then tuck your chin down onto your chest, is this worse than doing it with your leg bent.
In other words, it is the angle of the hip that makes the difference?
IF SO then whether you have the knee bent or not, the pain should be the same - to test this, sit with your feet out straight in front with your knees together, straight and at the same level as ezach other. Tuck your chin down. Note the pain. Now KEEP THE RIGHT LEG STILL and then bend the left knee so the foot is under the chair and the knees level. Now do the chin thing again. Note the pain
Does the pain feel more or less or the same with the leg straight compared to the leg bent. I need more/less/same, not just yes or no please.
I won't put the implications for positive and negative because i don't want to bias the result.
The other things i need you to do is have someone test your reflexes and babinski and clonus. Your chiro can do it, your doctor, physio or knowledgeable friend.
Also a sensation test. This is where you close your eyes and they use something light like cotton wool and touch you in the legs to see if there is a difference more/less/same that the other side.
Thanks!
I promise to answer!