The Rehab Roadmap: Measuring Your Progress After Knee Surgery

Written by Dan Vassilaros, Ph.D. | Sep 15, 2025 6:23:00 PM

When you pedal an OrthoBike you don’t need to visit a PT to see where your knee Range of Motion (ROM) is.

I was visiting one of my OrthoBike customer’s clinics when I heard a frustrated senior gentleman talking to his therapist. He was frustrated about his knee rehab.

“That is only a few degrees different from the last time I was here. How can you tell me my knee is better? I know your goniometer can’t tell the difference between 75 and 83 degrees! You say I am progressing but I am not!”

Hard to see day-to-day progress

That’s because the body changes slowly. We can still be making incremental progress but we may not see or feel small changes.

Measuring progress is difficult

One patient’s knee flexion angle was measured on a Friday at the end of her session. She pushed her knee hard all weekend only to be told by her therapist on Monday that it was about the same. She was sure she had made progress, and felt her confidence slip.

Goniometers may not be precise enough for incremental change

Physical therapists use a tool called a goniometer to measure knee angles during rehab. Studies have shown that the measurements can vary by up to 10 degrees so small changes may or may not be meaningful.

The real problem

There is currently no way to measure small improvements. And when patients can’t tell if they are getting any better, they can lose confidence and motivation. OrthoBike solves that problem.

OrthoBike is a powerful home therapy device that also allows patients to manage and measure their incremental progress.

People who rehab their knees and hips with OrthoBikes tell me that they loved knowing:

  • where they were,
  • where they were going,
  • what the next step was, and
  • how to adjust it to manage their rehab.

With OrthoBike’s Roadmap, patients can accurately track their progress–anytime–the big picture of the journey and the details from day-to-day. No more surprises or frustration with goniometer measurements.

How does this work?

It’s simple. The angle of your knee bend is controlled by two things: your pedal position, and your seat position.

The combination of seat and pedal position determines maximum knee flexion while pedaling.

The Rehab Roadmap

Our Roadmap shows your maximum knee angle from 60° to 115° as you adjust the seat and pedal positions. It is based on published science.

It is customized to your own leg length, and tells you:

  • where you are on your rehab journey, and
  • what to adjust to progress towards your goal.

The OrthoBike therapy system is built on three key principles that lead to improvement: Incremental, Systematic, and Progressive. We will share how this system has helped thousands of patients overcome difficult knees in an upcoming blog post.

It’s not just about the angle of your knee.

Your rehab journey is better measured by where the seat and pedals are, not just your knee angle. Every time you nudge the seat one notch closer to the bike, you add 3-5° more flexion to your knee as you rotate the pedals.

You will join the other OrthoBike patients in saying,

“No way could I have pedaled at this seat and pedal setting last week! I’m crushing this!”

This is the kind of progress that keeps you motivated. And you don’t need anyone else to tell you that you are improving.

Confidence, not doubt

Patients want to understand their progress so that they keep pushing through their rehab plan. Now, with the OrthoBike, you can replace doubt with confidence.