A US study has found that patients having total joint replacement (hips and knees) lost a signficant amount of weight post-surgery.
Knee replacement patients lost more than hip replacement patients but both did well.
20% of patients lost 5% of body weight or more. Not bad going.
See article the here
From memory there have been studies showing the opposite. Will research - maybe worth a post on The Arthritic Knee.
