Physical Therapy for Knee Pain: When to Start

The knee sits between the hip and the ankle and absorbs whatever those two fail to handle. That is why knee pain so often has nothing wrong with the knee itself — weak hips, a stiff ankle, or a loading pattern that puts force through the joint at an unfavorable angle will all present as knee pain first.

Start now if any of these apply

• Pain has lasted more than two weeks
• The knee swells after ordinary activity
• It gives way, catches, or locks
• Stairs — particularly going down — have become a deliberate decision
• You have started avoiding activities you used to do without thinking
• Pain wakes you at night

Giving way, locking, and significant swelling deserve prompt evaluation. The rest are not emergencies, but each one means compensations are forming, and compensations add time to the recovery.

What physical therapy does for knee arthritis

Exercise therapy is a first-line recommendation for knee osteoarthritis in major clinical guidelines, and the effect sizes for pain and function are meaningful. Strengthening will not reverse cartilage changes, but the relationship between what imaging shows and how much a knee hurts is far weaker than most patients expect. Plenty of people have significant arthritis on film and no symptoms.

Runner’s knee and kneecap pain

Patellofemoral pain — the ache at the front of the knee with squatting, stairs, or sitting — responds well to hip strengthening, which surprises people who expect the treatment to be aimed at the kneecap. Hip abductor and external rotator strength control how the thigh bone rotates underneath the kneecap. Fix the control problem and the tracking problem usually follows.

What treatment looks like

1. 01Identify the involved structure — kneecap, joint surface, meniscus, or tendon each load differently
2. 02Reduce irritation with manual therapy, swelling management, and short-term activity modification
3. 03Rebuild the chain: quadriceps, glutes, and calves, plus hip and ankle mobility
4. 04Restore tolerance through graded return to stairs, squatting, walking distance, or running

How long it takes

Straightforward knee pain often improves within 4 to 6 visits over 3 to 4 weeks. Arthritis management and long-standing patellofemoral pain usually run 8 to 12 visits, because strength changes take that long to accumulate. Patients who arrive within a few weeks of onset consistently need fewer visits than those who waited six months.

Do you need an MRI first?

Usually not. A clinical examination guides early treatment well, and MRI findings such as degenerative meniscus tears are extremely common in people without knee pain at all. Imaging becomes worthwhile when symptoms suggest a structural problem that would actually change the plan — a suspected ligament rupture, or a knee that keeps locking.