Knee pain: what is actually wrong, and what fixes it

What is actually causing my knee pain?

One of 7 patterns, in most cases. Read the descriptions below and you will likely recognize yours. The name matters less than the loading behavior: what provokes the pain, what calms it, and how fast it settles afterward. That behavior is what a doctor of physical therapy diagnoses and treats.

Runner's knee (patellofemoral pain)

An ache at the front of the knee with stairs, squatting, and long sits, and the single most common knee diagnosis we make. Imaging is usually normal because the problem is load, not damage. The 2019 clinical practice guideline is clear: quad and hip strengthening together beats either alone, and rest earns no recommendation. Runners get the full deep dive, including cadence work, on our running injuries page.

Meniscus tears

Twisting injuries in younger knees, gradual degenerative fraying in knees past 40. The tell is pain with deep squatting or pivoting, sometimes with catching. Here is what the surgeon may not lead with: randomized trials found exercise therapy matched arthroscopic surgery for degenerative tears at 2 years. Most meniscus pain settles with 8 to 12 weeks of loading work. Our guide to conservative meniscus treatment walks through the whole decision.

Knee osteoarthritis

Morning stiffness that loosens with movement, aching after activity, and the phrase bone on bone ringing in your ears. Exercise is the most consistently supported treatment for knee arthritis, and it does not wear the joint out faster: it is how many patients postpone or avoid replacement. The full arthritis playbook lives on our chronic pain and arthritis page and in our guide to managing knee arthritis without surgery.

Patellar tendinopathy (jumper's knee)

Pinpoint pain at the bottom edge of the kneecap, worst with jumping, kneeling, and the first minutes of activity, in athletes and lifters who load hard. This is a tendon capacity problem and it answers to progressive heavy loading, not rest. For tendons still stubborn after 12 weeks of good loading, we add shockwave therapy alongside the program.

IT band syndrome

Sharp pain on the outside of the knee that shows up at a predictable point in a run or ride. The band itself is not tight in any way you can stretch: the driver is almost always hip and glute weakness letting the thigh collapse inward, which is why the foam roller never cured it. The full story, and the hip strength fix, lives on our running injuries page.

Ligament sprains (ACL, MCL, and friends)

A plant, a pop, and swelling within hours: that story points at ligament. MCL sprains usually heal without surgery under a progressive plan. ACL decisions are bigger and depend on your sport, age, and instability, and we run both prehab and full return to sport testing for athletes on either path. Sport specific detail lives on our sports injuries page.

Baker's cyst

A ball of swelling and tightness behind the knee, often first noticed squatting or going down stairs. The cyst is almost never the disease: it is the knee's drainage response to something inside the joint, usually meniscus irritation or arthritis. Treat the driver and the cyst typically shrinks on its own. Drainage is reserved for the few that stay large and limiting.

Do I need an MRI before starting treatment?

Usually not. A skilled clinical exam identifies most knee patterns, and the first 4 to 6 weeks of treatment rarely change based on a scan. MRI earns its cost when red flags appear, when a locked knee will not straighten, or when 6 weeks of well run rehab moves nothing.

The reason we do not scan first is the imaging paradox. A 2019 meta-analysis of pain free, uninjured adult knees found cartilage defects in roughly 1 in 4 and meniscal tears in roughly 1 in 10, with both rising steeply with age. Scan enough healthy knees and you will find something in most of them. Treat the report instead of the person and you end up rehabbing, or operating on, a finding that was never the pain.

This is also why you do not need to wait on a physician visit to get started. Under Texas direct access law, a doctor of physical therapy can evaluate and treat you for up to 30 days without a referral. If your exam raises anything that genuinely needs imaging or a surgical opinion, we refer you the same week, with the exam findings already documented for the physician.

Why does my knee hurt when I squat, kneel, or climb stairs?

Because those movements concentrate force on the front of the knee. Deep bending under bodyweight multiplies load through the kneecap joint and patellar tendon several times over. When the quad and hip cannot share that work, the joint and tendon absorb the difference, and they are the tissues that complain first.

Which movement hurts is diagnostic information. Pain going down stairs more than up is classic kneecap joint behavior, because descending is braking work for the quad. Pain at the very bottom of the kneecap when you jump, land, or kneel points at the patellar tendon, especially with morning stiffness the day after training. A knee that complains at the bottom of a deep squat, or with a twist to get out of the truck, points toward meniscus. An ache that builds through a long sit, the movie sign, points back to the kneecap joint.

None of these patterns mean stop moving. They mean change the dose: shallower range, slower tempo, lighter load, then rebuild toward full depth as capacity returns. Around the loading plan we use manual therapy to restore joint and soft tissue motion, and dry needling when quad and calf trigger points are feeding the pain pattern. Both are support acts. Loading is the show.

When is knee pain serious enough to get checked first?

Rarely, but the exceptions matter. A knee that swells within 2 hours of an injury, locks and will not fully straighten, gives way repeatedly, or turns hot and red with a fever needs medical assessment now, not a wait and see plan. So does an inability to bear weight after a fall.

Each of those signs points somewhere specific. Rapid swelling after injury usually means blood in the joint, which raises the question of ACL rupture or fracture. A knee stuck short of full straightening suggests a displaced meniscus fragment blocking the joint. A hot, swollen knee with fever or chills raises infection, which is a same day medical problem, not a rehab problem. Night pain that never varies with position deserves a physician workup too.

We screen every knee for this list at the first visit. When something flags, we refer the same week, usually with a direct call to the orthopedic group rather than a note in your pocket. Catching the rare serious knee early is part of the job. So is telling the other 9 out of 10 knees, honestly, that nothing on this list applies to them.

What does knee treatment actually look like week to week?

Week 1 is measurement and pain settling. Weeks 2 to 6 are progressive loading, 2 sessions a week with clear strength targets. Weeks 6 to 12 rebuild the specific capacity your life demands: stairs, squats, yard work, sport. You know your numbers at every step, and you know what next week holds.

Weeks 1 and 2 start with the 60 minute evaluation: strength benchmarks side to side, movement screening, and a working diagnosis. Early sessions lean on manual therapy and load modification to calm the knee enough to train, because a knee that hurts at 8 of 10 cannot practice anything. You leave with 2 to 3 exercises, not a 14 exercise sheet destined for the refrigerator door.

Weeks 3 to 6 move to the gym floor, at Fusion in Lindale or inside B-Fit Tyler at 6421 South Broadway Avenue, Suite 600. This is where knee rehab actually happens: split squats, step downs, sled work, tempo squats, loaded to the point where the last reps are honest work. We retest your strength numbers every 2 weeks, so progress is a measurement, not a feeling.

Weeks 6 to 12 are about your specific finish line. For an athlete that means jump landings, cutting, and return to sport testing before Friday night. For a 60 year old it might mean a full flight of stairs without the handrail, an hour in the garden, or hunting season with a climb into the stand that the knee does not veto. The plan ends at your life, not at pain free rest.

On visit count, we will be straight with you: a typical knee runs 8 to 12 visits across those 12 weeks, front loaded early, spaced out as your home program takes over. We do not schedule 3 visits a week to fill a calendar. If your knee needs fewer, you get fewer.

What we actually do in clinic.

Frequently asked about knee pain.

Sources behind this page.

1. Willy RW, Hoglund LT, Barton CJ, et al. Patellofemoral pain: clinical practice guidelines linked to the International Classification of Functioning. J Orthop Sports Phys Ther. 2019;49(9):CPG1-CPG95.
2. Kise NJ, Risberg MA, Stensrud S, et al. Exercise therapy versus arthroscopic partial meniscectomy for degenerative meniscal tear in middle aged patients: randomised controlled trial with two year follow-up. BMJ. 2016;354:i3740.
3. Katz JN, Brophy RH, Chaisson CE, et al. Surgery versus physical therapy for a meniscal tear and osteoarthritis. N Engl J Med. 2013;368(18):1675-1684.
4. Culvenor AG, Oiestad BE, Hart HF, et al. Prevalence of knee osteoarthritis features on magnetic resonance imaging in asymptomatic uninjured adults: a systematic review and meta-analysis. Br J Sports Med. 2019;53(20):1268-1278.
5. Fransen M, McConnell S, Harmer AR, et al. Exercise for osteoarthritis of the knee. Cochrane Database Syst Rev. 2015;1:CD004376.
6. Malliaras P, Cook J, Purdam C, Rio E. Patellar tendinopathy: clinical diagnosis, load management, and advice for challenging case presentations. J Orthop Sports Phys Ther. 2015;45(11):887-898.
7. Skou ST, Roos EM, Laursen MB, et al. A randomized, controlled trial of total knee replacement. N Engl J Med. 2015;373(17):1597-1606.
8. Fredericson M, Cookingham CL, Chaudhari AM, et al. Hip abductor weakness in distance runners with iliotibial band syndrome. Clin J Sport Med. 2000;10(3):169-175.