My project is comparing Knee Extension, after total knee replacement, measuring with a goniometer and also using the computer to compare knee extension.
The experiment was performed on (30) thirty different people that had total knee arthroplasty. All thirty knees were done under a computer assisted guidence system, and at the end, three measurements of knee extension were made using the computer; and also three measurements, using the goniometer.
In looking at the data, the goniometer has a wide range of numbers, often times measuring between 0-5 degrees of knee extension, at the completion of the case. This is compared with the computer, which almost consistently has numbers such as 1.5, 1.0, with the final results in a very narrow range.
My question is: How do I structure the data to compare (30) thirty different knees with measurements showing extension with the goinometer, and extension with the computer, and how do I compare the statistical significance?
If you need more information, please feel free to e-mail me at (e-mail deleted by moderator)
Thank you for your help.