There is essentially two kinds of arthritis. Osteoarthritis and rheumatoid arthritis. If it's only on one side of your body in one spot, especially from an injury, it is likely osteoarthritis, which is isolated to only one spot, and will not spread as you said. IF your mother and grandmother had it all over they likely had rheumatoid, which is when your immune system starts attacking your joints.
So put shortly, if it's from the broken bone, you won't get it 'all over'. But if it's rheumatoid then you will and there's not a lot you can do. There are some immunosupressive drugs available to slow the progression, but I won't get into it since that doesn't sound like what is ailing you.
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"Glory is fleeting, but obscurity is forever."
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