The short version
- Pain around the kneecap with stairs, squats or long sitting often points to patellofemoral pain, also called runner's knee.
- Strengthening the quadriceps and hip muscles is a core treatment for both runner's knee and knee osteoarthritis.
- AAOS recommends exercise for knee osteoarthritis and reports that most runner's knee cases improve without surgery.
- Locking, giving way, or a hot, swollen knee with fever needs prompt medical care.
What causes knee pain?
Most knee pain comes from one of three sources: irritated tissue around the kneecap, wear of the joint cartilage, or an injury to a ligament or meniscus (the cushion between the thigh and shin bones). Tendons and bursae (small fluid-filled sacs) can also be involved.
| Cause | Typical feel | Common triggers |
|---|---|---|
| Patellofemoral pain (runner's knee) | Dull ache around or behind the kneecap | Stairs, squats, running, long sitting |
| Osteoarthritis | Stiff, achy knee, worse in the morning or after rest | Age, prior injury, extra body weight |
| Meniscus tear | Pain on the inner or outer joint line, catching or locking | Twisting with the foot planted |
| Ligament sprain | Pain and swelling after a specific injury, sometimes instability | Cutting, pivoting, contact |
| IT band pain | Pain on the outside of the knee | Running, cycling, downhill miles |
| Patellar tendon pain | Pain just below the kneecap | Jumping, sprinting |
Why does runner's knee happen?
AAOS describes patellofemoral pain as an overuse problem. It often follows a jump in training, new shoes or surfaces, or weak quadriceps and hip muscles that let the kneecap track off-center. It is common on the Katy Trail and White Rock Lake loops when mileage climbs quickly.
What symptoms should you watch for?
Pay attention to where it hurts and what sets it off. Front-of-knee pain with stairs, squatting or getting up after a movie points toward the kneecap. Stiffness that eases after you get moving points toward arthritis. Clicking, catching or locking after a twist points toward the meniscus.
Swelling that appears within hours of an injury, or a knee that gives way, suggests a structural injury and needs a closer look.
How do we evaluate knee pain?
Your visit starts with your history: when the pain began, what activities you do, recent changes in training or work, and past injuries. The exam checks swelling, range of motion, kneecap movement, ligament and meniscus stress tests, and strength of the thigh and hip muscles.
We also watch how you squat, step down and balance on one leg. Many knees hurt because the hip or ankle is not doing its share. X-rays are taken when arthritis, a bone injury or alignment questions are suspected. If a meniscus or ligament tear is likely, we refer you for an MRI or to an orthopedic surgeon.
What treatments help knee pain?
Exercise is the foundation. AAOS lists physical therapy that strengthens the quadriceps and hip muscles as central for runner's knee, and it recommends exercise for knee osteoarthritis to improve pain and function. Other treatments can make that exercise easier to do. Results vary.
- Physical rehab: Progressive quadriceps, hip and core strengthening, plus balance and movement training.
- Chiropractic adjustments: Gentle joint mobilization of the knee, hip, ankle or spine when stiffness is limiting movement.
- Soft tissue scraping: Instrument-assisted work on tight tissue around the thigh and knee. Evidence is limited; we use it with exercise.
- Laser therapy: Low-level light aimed at the painful area. Research on knee pain is limited and mixed, so we treat it as an add-on, not a main treatment.
- Dry needling: Targets tender trigger points in the thigh and hip muscles. Evidence for knee pain is limited.
- Medical pain management: Joint injections, when necessary, provided by our physician, Dr. Hector Molina, MD. AAOS notes that repeated steroid injections can damage the joint, so they are used sparingly.
For people carrying extra weight, losing some of it lowers the load on the knee with every step. Our medical weight loss program is run by Dr. Molina and starts with a medical evaluation.
What can you do at home?
- Adjust, do not stop. Trade high-impact runs for cycling, swimming or walking for a few weeks.
- Strengthen daily. Simple moves like sit-to-stands, bridges and side-lying leg raises build the muscles that steady the kneecap.
- Build back slowly. When you return to running, add distance gradually rather than in big jumps.
- Check your shoes. Replace worn-out pairs and avoid switching styles suddenly.
- Ice or heat. Ice after activity can calm a flare; heat can ease morning stiffness.
If hip or foot pain is part of the picture, see our pages on hip pain and plantar fasciitis.
When should you see an orthopedic surgeon or go to the ER?
Go to the ER for a deformed knee, an obvious fracture, or a hot, swollen knee with fever. See an orthopedic surgeon if your knee locks or keeps giving way, if you suspect a ligament tear after a pivoting injury, or if arthritis pain is disabling despite several months of good nonsurgical care.
Surgery is rarely needed for runner's knee. For advanced osteoarthritis, a partial or total knee replacement is an option worth discussing when daily life is limited. Our sports injuries page covers return-to-play steps after a knee injury.
When to see a doctor or go to the ER instead
- A hot, red, swollen knee with fever or chills can mean a joint infection and needs same-day medical care.
- Not being able to put weight on the leg after a fall or twist needs evaluation for a fracture.
- A knee that looks deformed, or a kneecap that has slipped out of place and stayed out, needs emergency care.
- Calf pain, warmth and swelling, especially after surgery, travel or immobility, can signal a blood clot and needs urgent care.
If you think you are having a medical emergency, call 911.
How we treat it
Frequently asked questions
Often yes, with changes. If pain stays mild during the run and settles by the next morning, many runners can keep going at lower mileage while they strengthen. Pain that makes you limp, builds during the run, or is worse the next day is a sign to cut back more and get evaluated.
For many causes, yes. Care at our clinic centers on exercise-based rehab, with hands-on joint and soft tissue work to ease pain and stiffness. We also check the hip, ankle and lower back, since problems there can change how the knee is loaded. Knees with a suspected major tear are referred to an orthopedic specialist.
Not usually at first. A careful history and exam can identify most common causes. X-rays help show arthritis or bone problems. An MRI is more useful when a meniscus or ligament tear is suspected, or when the knee is not improving with good care.
Osteoarthritis often changes slowly, and symptoms can go up and down over time. Exercise, weight management and activity changes can improve pain and function for many people. If pain becomes disabling despite good nonsurgical care, a knee replacement may be discussed with an orthopedic surgeon.
Sources
This page is general education, not medical advice. It cannot replace an exam. Results from any treatment vary from person to person.
