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Thanks, sqad. We'll give the gels a go and report back. (And get on to the GP if they don't.)
Droopdrawers, thanks too. She has had both hips and her other knee replaced, so she is well aware of the benefits of the op. Trouble is, she's 92 and lives alone with a minimum of help from a daily carer. She doesn't want to go into hospital for what would be a fairly prolonged stay at her age and stage of frailty, hence the 'cannot face the idea of an op.'
It's not the op that's the problem, it's the rehab afterwards that bothers her. Needless to say, the arthritis affects her hands, fingers and elbows too. It's not so painful in her hands etc, but it means that she has very little power or grip, so walking aids etc are difficult for her.
All this and she also has an iron will so will not be persuaded to do anything she doesn't want to do. (Good for her, I say, really...when I'm not trying to 'deal' with her, that is :-))