Houston Methodist. Leading Medicine

Hip FAQ

Question:

My doctor is going to include me in a study they are doing at their orthopedic center. I had a total hip replacement done with a mini-incision. They are going to compare patients with a mini-incision to patients with the standard cut. Maybe I'm a bit off in my thinking, but don't they just see what they want to find in studies like this?

Answer:

You're wondering about the bias in such a study. It's a valid and fair question. And one that researchers must ask themselves when setting up the study. There are ways to avoid this kind of problem.

For example, your study is being done after the operation is over. This is called a cohort or retrospective study. This type of study helps limit patient bias. The study takes place after you've finished your treatment. The results aren't biased by what you expect to happen.

The doctor may choose to compare your results with the final X-rays of the hip joint. In these cases, the X-rays are read by a doctor who didn't do the operation. The radiologist doesn't know by looking at the X-ray which patients had a small incision and which ones had the mini-incision.

Finally, scientists think that independent researchers reduce bias. These are studies done by people who weren't the first ones to try something. They aren't trying to prove something works. They are just looking at the results of using the method developed by someone else.

Steven T. Woolson, MD, et al. Comparison of Primary Total Hip Replacements Performed with a Standard Incision or a Mini-Incision. In The Journal of Bone and Joint Surgery. July 2004. Vol. 86-A. No. 7. Pp. 1353-1358.

*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 Medical Multimedia Group, L.L.C.. Content is the sole property of Medical Multimedia Group, LLC and used herein by permission.

Our Specialties

Where Does It Hurt?

Our Locations

  Follow Us

Follow us on Facebook Follow us on YouTube
Follow us on Twitter