Naples, Fla. (September 29, 2026) — The Zehr Center for Orthopaedics has adopted a new protocol for rehabilitation following knee replacement surgery. Designed to focus on the joint’s intuitive responses to inflammation, “The Quiet Knee” Rehabilitation Protocol is suitable for both partial and total knee replacement conducted on an inpatient or outpatient basis.
A “quiet knee” is a joint that is calm, low in inflammation, and stable. The very act of surgery creates a substantial inflammatory response in the joint. The first goal of this rehabilitation approach is to reduce swelling, allowing the knee time to return to its pre-operative state in preparation for restoring motion and function in the joint through physical therapy.
The key measure of the pace of the recovery is the knee itself. Patients are encouraged to listen to it. Overdoing walking, exercise, and motion of any kind one day will result in pain and swelling the next day. Only when the patient is comfortable with one level of activity, without experiencing additional swelling and pain, will they be progressed to the next phase.
“The Quiet Knee” Rehabilitation Protocol is carried out in four phases, taking patients from Surgery Day to Weeks 6 — 12+ Post-op.
Phase 1 — Protect the Knee
This phase runs from the day of surgery through the 10th day post-op. During these first 10 days, walking is for function only, not exercise. This applies regardless of how good the knee may feel. The first few days can be deceptive because the residual effects of the anesthesia, nerve blocks, and medications may make the knee feel better than expected.
The primary goals of this phase are to control swelling and pain; protect the healing tissues surrounding the knee joint; maintain full extension of the knee; and allow for gentle knee flexion. We want to avoid provoking inflammation.
During this phase, patients make good use of ice and elevation, using a prescribed cold therapy device. By days 6 — 10, pain and swelling should be improving. As swelling decreases, motion should improve naturally — patients should not force their knee to bend. At this point some simple early exercises will be assigned.
Phase 2 — Restore Motion
During days 10 — 21 post-op activity will gradually be increased, and work will begin with an outpatient Physical Therapy team. This phase is a bit more aggressive, placing emphasis on knee extension and flexion, normal walking mechanics, quadriceps activation, and gaining functional independence.
As in Phase 1, and throughout recovery, patients will continue to use swelling as their guide to how much activity their knee can tolerate. The goal is to establish gradual progression, not a cycle of overactivity and inflammation.
Now patients begin walking for exercise, concentrating on the quality of their gait, not simply the distance walked. Every knee and every patient recover differently and this applies to the range-of-motion goal of regaining full extension of the knee. If a patient is not making sufficient progress in a steady manner, they will be evaluated, not simply subjected to increasingly aggressive therapy.
Phase 3 — Restore Function
With swelling substantially decreased, and satisfactory motion developing, activity will gradually be increased during weeks 3 through 6. Gentle strengthening and balance exercises will be added to the routine. The stationary bike is introduced now as primarily a motion exercise rather than a strengthening exercise. Resistance can increase as swelling and pain permit.
Phase 4 — Build Strength and Endurance
Most patients do not need a Physical Therapist to work with them beyond week 6, so this final phase will most likely find them working on their own. Patients will be encouraged to progressively return to longer walks; stationary cycling; pool exercise once the incision has healed and they’ve received surgical clearance; strengthening the quadriceps; strengthening the hip and core; and balance training. Patients can expect to be able to return to their normal recreational activities as permitted.
With the focus on keeping the knee “quiet” throughout rehabilitation, using how it responds to each day’s activity to gauge progression, patients should find that their knee replacement recovery is a steady and satisfactory process.
For more information on this custom, hybrid rehabilitation protocol, contact the Zehr Center at 239-596-0100.
About Robert J. Zehr, M.D.: Board-certified and fellowship-trained, with over 35 years of experience, Robert J. Zehr, M.D., specializes in hip and knee replacement surgery. As Southwest Florida’s most experienced surgeon in the direct anterior approach to total hip replacement, he has performed over 3,500 surgeries using this technique, including Southwest Florida’s first same-day outpatient total hip replacement. He performed this history-making operation over 10 years ago at Seaside Surgery Center, Southwest Florida’s first facility designed and built for outpatient total joint replacements, which he co-founded. Consistently chosen as a Castle Connolly Top Orthopaedic Surgeon, Dr. Zehr has won numerous awards from peers and patients alike.