Knee Pain
When to Go to the ER

Call 911 When Knee Pain Follows Major Trauma or Travel Is Unsafe

• The knee injury followed a serious vehicle crash, high fall, crushing injury, or multiple injuries, and the person cannot be moved safely.

• Bleeding is severe, continues despite firm direct pressure, or is accompanied by faintness, confusion, or pale, clammy skin.

• The person has collapsed, is difficult to wake, or has serious trouble breathing after the injury.

• A badly deformed knee is followed by a foot that becomes cold, pale, blue, numb, or markedly weak, and safe private transport is uncertain.

These are not situations to test by standing or walking. Call 911 and keep the injured person as still as you safely can until help arrives.

Come to the ER When Knee Pain Should Not Wait

• You cannot put weight on the leg or take normal steps after a fall, twist, landing, or direct blow.

• The knee will not fully bend or straighten, becomes stuck, or repeatedly buckles when you try to stand.

• The knee or kneecap looks shifted, bent, or out of its normal position.

• A wound over the knee is deep or gaping, exposes deeper tissue, or continues to bleed.

• Swelling develops quickly after an injury, especially when a pop is followed by severe pain or instability.

• The foot below the painful knee becomes numb, unusually weak, cold, pale, gray, or blue.

• The knee becomes hot, red, swollen, and very painful, especially with fever, chills, or the feeling that you are becoming seriously sick.

You do not need every change on this list. One major loss of function, a visible deformity, a circulation or sensation change, or a hot and rapidly worsening knee can be enough to make emergency evaluation the right next step.

When Knee Pain Is Mild and Stable

Urgent care may be a reasonable starting point when the pain remains mild, is not getting worse, and you can still walk and move the knee close to normally. The knee should keep its usual shape, swelling should be limited, and there should be no lasting numbness, weakness, fever, open wound, or color or temperature change in the foot.

The important word is stable. If swelling begins to build, the knee starts locking or giving way, normal walking changes, or another warning sign appears, come to the ER.

What Happens After a Twist or Fall Matters More Than the Pop

You may pivot, hear or feel a pop, and still manage a few steps. Later, the knee may swell, feel loose, or stop straightening normally. That progression is useful information.

A pop does not tell you exactly what was injured. Different knee injuries can feel similar at first. What changes the decision is what follows: rapid swelling, severe pain, repeated buckling, loss of motion, or an inability to bear weight.

Start with what happened first and what you noticed next. That is enough to begin the conversation.

When a Child Stops Using the Knee Normally

Children may show knee pain before they can explain it. After a fall or sports injury, a child may refuse to stand, avoid putting weight on one leg, or cry when the knee is moved.

Come to the ER when your child cannot stand or walk normally after a significant knee injury, especially when the knee looks abnormal, swelling is increasing, or the foot looks or feels different. A hot, swollen knee with fever or a child who appears seriously sick also needs prompt evaluation.

The important change is not whether your child can name the injury. It is whether the knee has stopped working normally.

What to Do While You Are Arranging Care

Stop the activity and do not keep testing the knee by walking on it. Support the leg in the position that is most comfortable. Do not force a locked or deformed knee straight, and do not try to push the joint or kneecap back into place.

For an open wound, cover it with clean material and use firm direct pressure if it is bleeding. Do not probe the wound or remove an embedded object. A wrapped cold pack may help a closed injury, but temporary relief should not delay emergency evaluation when warning changes are present.

How Our Emergency Physician Will Evaluate Knee Pain

At Post Oak ER, the first step is listening to what happened and examining what has changed. The emergency physician will ask when the pain began, whether there was a fall or twist, how quickly swelling appeared, and what you can no longer do normally.

The examination may compare both knees and check alignment, tenderness, swelling, warmth, movement, and stability. The physician may also check strength, feeling, skin color, temperature, and blood flow below the knee.

Testing follows the conversation and examination. An X-ray may help when a fracture or joint displacement is possible. Some ligament, tendon, cartilage, and other soft-tissue injuries do not appear clearly on an X-ray and may require later imaging or specialist follow-up. When the knee is hot, swollen, and very painful, blood work and further joint evaluation may be needed to look for infection or another acute problem.

Treatment can begin during the visit. Depending on the findings, care may include pain treatment, support or immobilization, wound care, and monitoring. If you need hospital admission, surgery, or specialty treatment, Post Oak ER can begin emergency care, stabilize you, and arrange transfer.

24/7 Emergency Care Near The Galleria

Post Oak ER is open 24 hours a day at:

5018 San Felipe Street
Houston, TX 77056

Our freestanding emergency room is near The Galleria and I-610. Adults and children may walk in without an appointment for severe or concerning knee pain. You can also call 832-581-2277.

We serve patients from Uptown, Tanglewood, River Oaks, Briargrove, Briarcroft, Highland Village, and the greater Galleria area.

When knee pain follows major trauma, bleeding is severe, the person collapses, or the injured person cannot be moved safely, call 911 instead of driving.