Post-Operative Instructions For Total Knee Replacement

Post-operative care following Total Knee Arthroplasty (TKA) differs fundamentally from other knee surgeries in two critical ways:

Permanent Postural Restrictions: Deep squatting and sitting on the floor are permanently prohibited to prevent severe mechanical stress, premature polyethylene liner wear, and early joint failure.
Immediate Mobilization: Patients begin walking with a walker on Day 1 or Day 2 post-op—much earlier than most patients expect.

Key Post-Operative Guidelines & Precautions

Early Ambulation: Walking with a walker begins within 24 hours of surgery to promote circulation and prevent Deep Vein Thrombosis (DVT).
Elevation & Cryotherapy: Keep the leg elevated above heart level. Apply cold packs wrapped in a cloth for 15–20 minutes several times daily to manage swelling.
Medication Compliance: Strictly adhere to prescribed anticoagulants (blood thinners), analgesics, anti-inflammatories, antibiotics, and stool softeners.

Sleeping Position & Critical Precautions

Correct Sleeping Position: Sleep flat on your back with the leg elevated by placing pillows under the ankle/heel.
CRITICAL ERROR — Pillows Under Knee: Never place a pillow directly under the knee bend during sleep or rest. This keeps the joint in partial flexion, causing permanent flexion contractures and stiffness.
Permanent Prohibitions: Deep squatting, sitting on the floor, high-impact running/jumping, and lifting heavy loads on stairs.
Temporary Restrictions: Driving (restricted for 4–6 weeks), low-profile seating (avoid for several months), and showering without a shower chair (first 2 weeks).

Recovery & Activity Timeline

Activity / Stage	Expected Timeline
Walker Ambulation	Day 1 to Weeks 2–4
Transition to Single Cane / Independent Walking	Weeks 4–6
Driving & Basic Daily Activities	Weeks 4–6 (once pain-free motor control returns)
Functional Recovery	6–12 weeks
Ideal Lifetime Activities	Walking, stationary cycling, and swimming
Full Maturity & Complete Joint Adaptation	12 to 18 months

Physical Therapy Goals

Week 2 Target: Achieve $90^\circ$ of knee flexion.
Month 3 Target: Achieve $>120^\circ$ of flexion alongside complete quadriceps activation.

Red Flag Symptoms Requiring Immediate Medical Attention

Contact your orthopedic surgeon immediately if you experience:

Signs of Infection (PJI): Fever $>38.3^\circ\text{C}$ ($101^\circ\text{F}$), excessive redness, or purulent wound drainage.
Signs of DVT / Pulmonary Embolism: Sudden painful calf swelling, acute shortness of breath, or chest pain.
Mechanical Warnings: Flexion limited to $<90^\circ$ at 2 months, or sudden sharp pain with minor movement (raising concern for periprosthetic fracture).

Frequently Asked Questions About Post-Operative Instructions for Total Knee Replacement (TKA)

When can I begin walking and bearing weight after Total Knee Replacement?

Most patients begin standing and walking with full weight-bearing as tolerated on the day of surgery or within 24 hours post-operatively. Crutches or a walker are used for support and balance under the direct guidance of your physical therapist to promote blood circulation and joint stability.

How should I care for my surgical incision and bandage?

Keep your surgical dressing clean, dry, and intact. If your surgeon applied an advanced waterproof or silver-impregnated bandage, leave it undisturbed until your follow-up visit. Do not scrub, pick at, or remove Steri-Strips or surgical staples on your own.

How often should I apply ice and elevate my leg?

Apply cold packs or a continuous cold therapy unit for 15 to 20 minutes every 2 hours during the first few weeks, particularly immediately following physical therapy. Always elevate your leg above heart level using pillows placed under the calf or ankle—never directly behind the knee joint.

Why is it dangerous to place a pillow directly behind my knee while resting?

Placing a pillow directly behind the knee holds the joint in a flexed (slightly bent) position. Prolonged knee flexion can rapidly cause hamstring tightness and lead to a permanent loss of full knee extension (flexion contracture). Always support the leg under the calf or ankle to keep the knee straight.

What medications will I need to take at home after TKA?

Your post-operative medical plan typically includes:

Anticoagulants (Blood Thinners): Oral drugs (e.g., Aspirin, Rivaroxaban, or Apixaban) to prevent deep vein thrombosis (DVT).
Multi-Modal Analgesics: Scheduled NSAIDs and short-acting opioids for acute pain control.
Stool Softeners: To counteract constipation caused by prescription narcotic pain medications.

When is it safe to take a shower or bath after total knee replacement?

Showering is permitted once your surgical team confirms the incision is dry or protected by a sealed waterproof bandage (often 48 to 72 hours post-op). Gently pat the area dry afterward. Avoid submerging the surgical knee in a bathtub, hot tub, or pool for at least 3 to 4 weeks until incisions are fully healed.

When should physical therapy begin, and what home exercises are essential?

Physical therapy starts in the hospital on Day 0 or Day 1 and continues with outpatient or home therapy. Key home exercises to perform multiple times daily include ankle pumps, quad sets, straight leg raises, and heel slides to restore flexion and quadriceps strength.

When can I safely resume driving and return to work?

Timelines depend on functional recovery and job demands:

Driving: 4 to 6 weeks for a right-leg procedure (or 2 to 3 weeks for a left-leg procedure with an automatic transmission), provided you are off narcotic medications and have normal braking reaction time.
Desk Work: 2 to 4 weeks with mobility accommodations.
Manual Labor: 8 to 12 weeks, contingent on full strength and endurance.

How should I prepare my home environment for a safe recovery?

Ensure safety before surgery by removing trip hazards like throw rugs and loose cables, clearing wide paths for a walker, installing shower grab bars, placing a raised toilet seat, and using a firm, high-backed chair with armrests to ease standing up.

What warning signs require immediate medical contact with my surgeon?

Contact your surgical team or visit emergency care immediately if you develop:

Fever over 101°F (38.3°C) or shaking chills.
Increasing warmth, spreading redness, or severe joint swelling.
Foul-smelling or purulent fluid draining from the incision line.
Severe calf tenderness, pain, or leg swelling.
Sudden chest pain, shortness of breath, or coughing up blood.