Patient Information Resources

1089 Spadina Road
Toronto, AL M5N 2M7
Ph: 416-483-2654
Fax: 416-483-2654

Child Orthopedics
Spine - Cervical
Spine - Lumbar
Spine - Thoracic

View Web RX

« Back

Last year I spent $2,000 purchasing a continuous passive motion machine to use after a total knee replacement. I was planning to resell it. Now I find out the latest studies say it doesn't work. What's this all about?

Continuous passive motion (CPM) was first used in the 1980s when a well-known orthopedic surgeon did some studies with it to help joints heal after fractures. It's use after total knee replacement has been debated for years.

Some studies show CPM helps patients get more motion back faster. Others say it doesn't make a difference. Some studies show a shorter hospital stay for patients using CPM. Others don't show any difference at all.

Researchers suggest different study designs and methods of research may explain these varied results. For example, in one study the CPM was only used for 24 hours after the operation. Another study used it for three hours twice a day for five days.

Sample size (the number of patients in the study) can make a difference in results, too. Smaller studies may not be as valid as larger studies. Finally surgery has improved over the years making the use of CPM less necessary. Patients are already able to move freely after the operation with fewer muscles cut and less swelling. They don't need a machine to passively bend and straighten the knee for them.


« Back

*Disclaimer:*The information contained herein is compiled from a variety of sources. It may not be complete or timely. It does not cover all diseases, physical conditions, ailments or treatments. The information should NOT be used in place of visit with your healthcare provider, nor should you disregard the advice of your health care provider because of any information you read in this topic.

All content provided by eORTHOPOD® is a registered trademark of Mosaic Medical Group, L.L.C.. Content is the sole property of Mosaic Medical Group, LLC and used herein by permission.