Pain and swelling after knee surgery What is normal, how long it lasts and what helps

Our post on how to recover after knee surgery covers the first weeks of rehab. This one answers the two questions patients ask us most often after an operation: how much pain and swelling is normal, and how do I bring it down so therapy can move forward? Your surgeon’s instructions always come first, and our pre- and post-surgical rehab program is built around them.

Why the knee swells after surgery

Surgery is a controlled injury. Inflammation brings extra fluid into the joint and the tissues around it, and you move less in the first days, so the calf and thigh muscles pump less fluid away. Gravity then pulls some of it down toward the shin and ankle. Swelling is more than a comfort problem: it makes the thigh muscles harder to switch on and physically blocks the knee from bending and straightening, which is why controlling it is part of rehab.

How long swelling after knee surgery usually lasts

• Arthroscopy, such as a meniscus trim: most swelling settles within two to six weeks
• ACL reconstruction: swelling peaks in the first two weeks; a little swelling after activity can last a few months
• Total knee replacement: swelling is greatest in the first few weeks; mild swelling and warmth can come and go for three to six months, sometimes longer

These are typical ranges, not rules. Your surgeon knows the details of your operation and sets your expectations. For the other milestones after a knee replacement, see our knee replacement recovery timeline.

What normal pain after knee surgery feels like

Expect aching, tightness and soreness that is worse at night and after therapy in the early weeks, then trends down week by week (for other operations, see pain after surgery). In the second video, a patient who had a knee replacement talks about her pain while working through band exercises. Soreness after a session that settles within a day is usually fine. If it lasts longer, tell your therapist so the plan can be adjusted rather than pushed.

What helps pain and swelling

• Ice: 10 to 15 minutes at a time, several times a day, with a cloth between the ice and your skin
• Elevation: raise the leg above heart level with support under the ankle, not under the knee, so the knee can straighten
• Ankle pumps: point and flex the foot often through the day to keep fluid moving
• Compression: a stocking or wrap, if your surgeon recommends it
• Pacing: short, frequent walks instead of one long outing
• Medicines: take them exactly as your surgeon prescribed

How physical therapy helps

Physical therapy after surgery works on swelling, pain and motion together. In the first video, a physical therapist checks a patient whose knee is still in a hinged brace and shows which thigh muscles to start waking up. The third moves on to stretching and then stepping drills to beat stiffness, and the fourth shows a therapist measuring knee bend with a goniometer, a simple way to see whether swelling is still limiting motion. Gentle manual therapy, kinesiology taping for some patients (see kinesio tape for knee) and an exercise dose that is adjusted on puffy days all help. For bending and straightening targets after a knee replacement, see knee replacement range of motion.

When to call your surgeon

• Fever or chills
• An incision that is red, hot, draining or opening
• Pain, tenderness or swelling in the calf
• A sudden jump in swelling or pain, or losing motion you had gained
• New numbness in the foot

Call 911 for chest pain or shortness of breath, which can be signs of a blood clot in the lungs. For a swollen knee that is not related to surgery, see how to relieve knee pain and swelling and our swollen knee page.

Related care at Precision Care Medical & Sports Performance

Physical therapy after knee surgery near you

Physical therapy after knee surgery is offered at two Precision Care Medical & Sports Performance offices. For post-surgical rehab in Brooklyn, our Brooklyn physical therapy team at 2781 Shell Rd, physical therapists Zoya Reznik, DPT, OCS and Maggie (Yi) Zhang, DPT, with physical therapist assistants Dennis Furman, PTA and Leila Nahmoud, PTA, sees patients from Bensonhurst, Marine Park, Midwood and Brighton Beach. For knee replacement physical therapy on Staten Island, physical therapists Victoria Lynn Kain, DPT and Nicholas “Nick” Ursini, DPT see patients at our Staten Island physical therapy office, 1630 Richmond Rd, convenient to Dongan Hills, Grant City and Midland Beach.

The same teams see patients after ACL and meniscus surgery, so if you are looking for ACL rehab near me, either office can help. Request an appointment or call the Brooklyn or Staten Island office. Physical therapy is not offered at the Midtown Manhattan office.

Questions patients ask

Educational only, not medical advice. These videos and this article explain common problems and treatments in general terms. They are not a diagnosis or a treatment plan for you. Results vary from person to person. See a qualified clinician about your own symptoms, and call 911 or go to an emergency room for an emergency.

← More videos and articles on the Precision Care Medical & Sports Performance blog