@cookiemom I felt vindicated after reading your post because I, also, have had a hinged knee replacement that causes my knee to buckle and collapse. My husband and everyone else, including my surgeon, have claimed I'm not doing my therapy hard enough to strengthen my muscles. I don't think I or anyone would be capable of strengthening the knee muscles enough to overcome the mechanical collapse of the prosthesis.
You state you have learned cautions in order to avoid falls but I have not been able to predict what causes my knee to collapse. It happens suddenly and without warning which makes it impossible to predict or preempt. It doesn't happen every day; sometimes it doesn't happen for two or three weeks at a time and then it catches me unawares and happens once again. A cane, which everyone insists I carry, will not prevent the collapse; it will just fly out of my hand when it happens. My leg, below the knee, also splays out as I walk.
I would appreciate any insight you can provide. Do you think all hinged knee prostheses behave in a similar manner or did I get a particular brand that is more prone to collapsing?. My surgeon isists he is not aware of anything and he says there hasn't been a recall.
Needless to say, this has dramatically affected my life and activities. I think twice before I even cross a room. It's hard to accept that there is no solution.
Thank you for any advise or insight you can provide.

Marina Villalobos