Your Guide to Recovery After Knee Replacement Surgery
After knee replacement, the way it's done today, most surgeries are performed minimally invasive with robotic navigation—and most patients go home the same day. Dr. Jay Boughanem walks you through exactly what to expect during recovery, from the exercises you'll need to do, to when you can shower, to how quickly you'll get back to normal activities.
The most important thing to remember: that knee needs to be used to stay active and healthy. Movement starts immediately.
→ Watch Dr. Jay demonstrate the essential recovery exercises.
What to Expect: Day of Surgery
Dr. Jay's knee replacements are performed with minimally invasive techniques using robotic navigation for precise surgical outcomes. Before surgery, you'll receive a peripheral nerve block called an adductor canal block, which numbs the nerve going to the knee.
The result: When you wake up from surgery, you're not having much pain—a lot of patients actually have zero pain.
You'll be walking the same day after surgery. Standing up, walking, and using the knee for activities of daily living begins immediately. Same-day discharge means you come to the hospital and go home the same day.
The Three Essential Exercises
These exercises are critical for recovery. You'll start them right away and continue throughout your rehabilitation. The goal: regain full bending (flexion) and straightening (extension) of the knee, plus rebuild muscle strength.
Exercise 1: Heel Slides (Regaining Flexion)
This exercise helps you regain the ability to bend your knee.
How to do it:
- Lie flat on your back
- Slowly bend your knee, sliding your heel toward your buttocks
- When it becomes painful, hold there
- Take slow, deep breaths—exhale and try to relax the muscles
- When you feel more comfortable, slide the heel a little closer
- Rest, then repeat
The breathing technique:
- When you're resting and having discomfort, your muscles will contract and become tight
- When you exhale, relax all the muscles and prepare for the next stage
- On the inhale, there's awareness—then pull a little more
- On the exhale, relaxation
Repeat this cycle 10-15 times. Each breath brings your heel closer to you.
The goal: Get to 90 degrees (that's the safe zone), but keep working until the range of motion on the surgery side is as good or better than the other side—heel as close to the buttocks as possible.
Exercise 2: Extension Press (Regaining Straightness)
After knee replacement, sometimes the knee doesn't want to straighten all the way. This exercise fixes that.
How to do it:
- Sit up with your leg extended
- Place a book (or rolled towel) under your heel to elevate it slightly
- Put both palms on top of your thigh, just above the knee
- Press down firmly
The breathing technique:
- On the inhale, press down and maintain pressure toward a straight knee
- On the exhale, relax the muscles behind the knee
- Breathe through your nose to help the muscles relax
Repeat this cycle 10 times.
Why both exercises matter: With these two exercises, you're going to regain the bending AND the straightness of the knee. That's what the knee does—it needs both.
Exercise 3: Straight Leg Raises (Rebuilding Strength)
This exercise strengthens your quadriceps muscle and the VMO (the muscle that controls your kneecap), which helps the knee heal faster.
How to do it:
- Lie flat on your back
- Keep your knee straight and lift your leg, hovering just above the table/bed
- Lower it back down
- Repeat 10 times
Important: Don't lift all the way up—just hover. It's actually harder if you just hover, which is what makes it effective.
Then:
- Hold the leg up and pulse 10 times (small movements)
- Finally, hold it up and breathe—this is hard, but it gets the oxygen flowing and promotes healing
- When it's shaking and you feel the burn, slowly lower it down
Dr. Jay's tip: "Keep smiling when you're doing this."
Variation for complete strengthening:
- Do the exercise with toes facing UP (targets one part of the quad)
- On alternate days, do it with toes facing OUT (targets the other part)
Example: Wednesday with toes up, Thursday with toes out—so you get both parts of the muscle engaged and stronger.
Preventing Blood Clots
Blood clot prevention is critical after knee replacement. Dr. Jay's protocol includes:
- Aspirin as prescribed
- Heel pumps (flexing your foot up and down)
- Flexion and extension exercises with the knee
- Early and frequent movement
The exercises you're doing for recovery also help prevent clots by keeping blood circulating.
Wound Care & Dressing Timeline
Day of surgery: You'll have bulky dressings including an ace bandage wrapped around the knee.
Day 3: The ace bandage can come off. Underneath, you'll find water-resistant dressings.
Days 2-3 onward: Once the ace bandage is off, you can shower. Let water run over the water-resistant dressings, but keep the area clean and dry.
2 weeks: The silver-impregnated dressings attached to the skin can come off.
Underneath: There's a layer of glue and steri-strips that will stay until they fall off by themselves.
Important wound care rules:
- Do NOT put any creams or ointments on the wound
- Try not to touch the wound
- Keep it clean and dry
Pain Management
Dr. Jay's approach minimizes the need for narcotic pain medication:
Immediately after surgery:
- Adductor canal block provides significant pain relief (many patients wake with zero pain)
Ongoing pain management:
- Cold water therapy machine — Circulating cold water helps decrease inflammation, pain, and swelling. This helps recovery significantly and decreases the need for narcotics.
- Tylenol (acetaminophen) and NSAIDs for ongoing discomfort
- Small amounts of narcotic medication if needed, though most patients can get along without them
Recovery Timeline: What to Expect
Day 1: You're walking. Standing up, using the knee for daily activities.
Week 1: Continue exercises daily. Some discomfort is normal. Use cold water therapy consistently.
Week 2: This is typically the inflection point—the wound is healing, and pain becomes better than it was before surgery. From here, it keeps getting better.
Weeks 2-12: Regular, steady improvement over the next few months.
Long-term outcome: Most patients go to a zero level of pain or very small amount of discomfort. For people who had severe knee arthritis with 9 or 10 out of 10 pain before surgery, pain typically goes to zero or one. That's the most common outcome.
FAQ Section for Post-op Knee Replacements
Q: Can I walk the same day after knee replacement surgery?
A: Yes. With Dr. Jay's minimally invasive approach and same-day discharge protocol, you'll be standing and walking the same day as surgery. Early movement is encouraged to promote healing and prevent complications.
Q: How long does knee replacement recovery take?
A: The two-week mark is typically when pain becomes better than before surgery. Most patients see steady improvement over the following 2-3 months. Full recovery and maximum benefit is usually achieved within 3-6 months, though you'll be functional much sooner.
Q: Will I need narcotic pain medication after knee replacement?
A: Most patients can manage pain with the cold water therapy machine, Tylenol, and NSAIDs without needing narcotics. Dr. Jay's approach—including the nerve block before surgery and cold therapy after—significantly reduces the need for narcotic pain medication.
Q: When can I shower after knee replacement?
A: You can shower 2-3 days after surgery, once the outer ace bandage is removed and the water-resistant dressings are in place. Let water run over the dressings but keep the wound area clean and dry. Don't submerge the knee in water (no baths or swimming) until cleared by Dr. Jay.
Q: How long will I need a walker or crutches after knee replacement?
A: Most patients use a walker for the first few days to a week, then transition as they feel more stable. You're weight-bearing immediately—the walker is for balance and confidence, not because you can't use the knee.
Q: What exercises should I do after knee replacement?
A: The three essential exercises are: heel slides (for bending), extension presses (for straightening), and straight leg raises (for strength). Start these immediately after surgery and continue throughout recovery. Dr. Jay demonstrates each exercise in the video above.
Q: What is the 90-degree rule after knee replacement?
A: Getting to 90 degrees of knee bend (flexion) is considered the "safe zone" in recovery. But the goal is to keep working until your surgical knee bends as well as—or better than—your other knee, with your heel as close to your buttocks as possible.
Q: How do I know if my knee replacement recovery is on track?
A: Key milestones: walking same day, showering by day 3, pain improving by week 2, and steady progress over the following months. If you're doing your exercises consistently and seeing gradual improvement in range of motion and pain levels, you're on track.