I've had a few falls in the past (thankfully with no big injuries!) with urinary incontinence with "jello legs" in the last few years. It was always when I was standing or walking for a few minutes, without any kind of support. I'm usually pretty sendentary/in the house. If I could catch myself and sit down, at least I didn't pee myself. Sorry if that's tmi folks !
I stated a walking program in April (not suggesting that everyone can do that......I had support stating in March with a cortisone injection to my L hip bursitis, restarting Cymbalta, major increase in narcotic dosages, and the incentive that my mom broke her back/was dx'd with Parkinson's....and I, the family nurse, couldn't do much to help.
I had quite a few issues when I started exercising, getting "stuck" when my legs just went to jello/overwhelming pain in both hips and knees (fibro issues, my RSD in L neck/arm). I just sat until I felt better. Had to make sure I had my cell phone with me, so I could call my 75 yo daddy to come rescue me if need be. Now that I'm more in shape (still have a loonnnggg way to go, but I am down 45 pounds and at least have some activity tolerance now), the jello legs happens much less frequently. I do know every rock to sit on and fence to lean on in my neighborhood and in my mom's neighborhood !