'Housemaid's knee', which is now more commonly known as 'carpetlayer's knee' is a particular type of soft tissue rheumatism, which is caused by something called bursitis. This condition also causes bunions.

Bursitis is an inflammation of the fibrous tissue that lubricates tendons where they pass over bones. It usually affects the knee, but can occur in any joint including the toes (bunions) and elbow. The best way to prevent bursitis is to avoid long-term pressure and rubbing on joints when possible. Make sure that your shoes fit properly, and use knee pads when doing gardening, housework or, of course, carpetlaying.