I am taking this way off thread but it may help someone who has trouble with their legs, forget doctors.
If anyone has trouble in that their legs ache at the knees after just a small amount of walking and it’s getting worse it may be because their legs won’t straighten properly. Consequently, when they walk their legs never straighten so it’s like walking with your knees bent all the while.
Sit on the floor with your legs out straight; you should be able to push your knees down to the floor. Grasp your toes with each hand from the top, and force your legs down to the floor. Someone who is really supple will be able to raise their heels.
Flexibility in the knees should be both ways, you should be able to touch your bum with your heels. If not try kneeling on the edge of your bed one leg at a time so as to touch your bum with your heel.
Try these every day say in the morning without fail; and see the results in three months.
Sorry about the ‘off thread’.
:offtopic:
My avatar is a poor likeness.