The encouraging news: PFPS is one of the most treatable knee conditions when you address the real drivers (strength, mechanics, training load, and footwear), not just the pain.

In this blog you’ll learn:

• Why stairs are such a common trigger

• The best patellofemoral pain syndrome exercises (with progressions)

• What to change in your training right now

• When you should get evaluated

• How we combine PT + running mechanics to get you back faster

If you want a clear diagnosis and a plan that matches your running goals:

• Sports Medicine + PT: https://princetonmedicine.com

• Running performance + biomechanics: https://psfmwellness.com,  https://fusesportsperformance.com/

What is patellofemoral pain syndrome (PFPS)?

PFPS is pain that comes from the patellofemoral joint—where the kneecap (patella) glides on the femur. It’s not one single “injury,” but a pattern of pain often driven by:

• Overuse (rapid mileage/speed/hill changes)

• Poor load tolerance in the quad/hip/foot system

• Movement patterns that increase stress at the kneecap

• Training errors (too much too soon, not enough recovery)

PFPS is incredibly common in:

• Runners (new runners and experienced runners alike)

• Adolescents and athletes in pivoting sports

• People ramping up strength training (especially squats/lunges)

• Anyone spending lots of time on stairs, hills, or prolonged sitting

Why do stairs hurt so much with PFPS?

Stairs increase knee flexion angle and require more force through the patellofemoral joint—especially when descending. Think of it as a “compression and control” problem:

• The deeper your knee bends, the more the kneecap presses into the groove

• Descending stairs demands eccentric control (slowing down)

• If the hip, quad, and foot mechanics aren’t sharing load well, the patellofemoral joint gets overloaded

That’s why “knee pain stairs” is such a classic PFPS symptom.

Common symptoms of runner’s knee

PFPS often includes:

• Pain around/behind kneecap, especially with stairs, squats, hills

• Pain after sitting (the “movie theater sign”)

• Pain with running that warms up then returns later

• Clicking/grinding sensation without true “locking”

• Swelling is usually minimal (but can happen)

Red flags that merit an in-person evaluation sooner:

• True locking, catching, or giving way

• Large swelling

• Inability to bear weight

• Pain after a major fall/twist

If that’s you, start with a sports medicine evaluation:

• https://princetonmedicine.com

Patellofemoral pain syndrome exercises (the “fast path” plan)

The best PFPS programs do two things:

1. Calm pain by reducing irritability and improving alignment/control

2. Build capacity through progressive loading (so you can run without flare-ups)

Below is a staged plan. If you’re unsure which stage fits you, that’s exactly where PT helps.

Stage 1 (1–2 weeks): Calm pain and rebuild control

Goal: Reduce symptoms, improve tolerance to daily movement.

Key rules:

• Keep pain during exercises at ≤ 3/10

• Symptoms should settle within 24 hours

• Modify depth and volume before stopping completely

Best early exercises:

• Isometric wall sit (partial depth, 30–45 sec x 3–5)

• Straight leg raise (quad control)

• Side-lying hip abduction (glute med strength)

• Clamshell progression (if you feel glutes, not low back)

• Step-downs (very small step) focusing on knee control

Mobility that often helps:

• Hip flexor mobility

• Calf/ankle mobility (limited dorsiflexion can increase knee load)

• Gentle quad flexibility (avoid painful kneecap compression stretches)

Stage 2 (2–6 weeks): Build strength where it matters (hips + quads)

Goal: Improve load-sharing so the kneecap isn’t taking the entire hit.

Key strengthening moves (progressive):

• Split squat (shallow → deeper as tolerated)

• Step-ups (low step → higher step)

• Spanish squat (great quad load with less kneecap irritation for many)

• Single-leg Romanian deadlift (hip control + balance)

• Lateral band walks (hip endurance)

Technique cues that reduce kneecap stress:

• Keep knee tracking over the 2nd–3rd toe

• Control the descent (eccentric)

• Don’t let pelvis drop or trunk collapse

• Work within a range that’s challenging but not sharp/pinchy

Stage 3 (4–10 weeks): Return to running (without the boom-bust cycle)

Goal: Reintroduce impact gradually and build “knee confidence.”

Return-to-run checklist:

• Stairs are improved (especially down stairs)

• You can do step-downs with good control

• Single-leg squat to a chair is tolerable

• Your knee is not flaring the next day after strength work

Return-to-run progression (example):

• Walk/jog intervals (short jogs, plenty of walking)

• Increase total running time before speed

• Add hills only after flat running is steady

• Add speed last

This is where a running form screen can save you weeks:

• A small technique change (step rate, overstride reduction, trunk position)

• Identifying hip drop, dynamic valgus, or foot/ankle contributors

Stage 4: Performance and recurrence prevention

If PFPS keeps coming back, it’s usually not because you “didn’t rest enough”—it’s because the system isn’t handling training load + mechanics + strength together.

Recurrent PFPS often benefits from:

• Biomechanics assessment (running gait + strength)

• Objective testing (single-leg control, hop tests, endurance, symmetry)

• A plan for hills, speed, and race build phases

• Footwear guidance and, when appropriate, orthotic/insert strategy

For a deeper biomechanics and performance approach:

• https://psfmwellness.com

Training modifications that help immediately (without stopping running forever)

If you’re in a flare:

• Reduce intensity and hills first (not just mileage)

• Avoid deep knee compression early (deep squats, deep lunges)

• Shorten stride / increase cadence slightly (often decreases knee load)

• Run flatter routes temporarily

• Cross-train (bike/elliptical) if impact is the main trigger

A good plan avoids the “stop for 2 weeks → feel better → return → flare” loop.

Runner’s knee treatment: when to see a clinician

Consider evaluation when:

• Pain lasts >2–3 weeks despite smart modification

• Stairs remain painful or worsen

• You have a race/season deadline

• You’ve had recurring episodes

• You’re unsure whether it’s PFPS vs patellar tendinopathy, meniscus, cartilage, or hip referral

Start here for diagnosis + plan:

• PSFM evaluation: https://princetonmedicine.com

Ready to get back to running—faster and with less guesswork?

If you’re searching for patellofemoral pain syndrome exercises or runner’s knee treatment, let’s make it simple:

1) Book PT + running form screen

• https://princetonmedicine.com

2) Upgrade to a Run Stride Evaluation if recurrent (especially if this keeps coming back every training cycle)

• https://psfmwellness.com, https://fusesportsperformance.com/

Medical note: This article is for education and is not a substitute for individualized medical care. If you have significant swelling, mechanical locking, inability to bear weight, or acute trauma, please seek prompt evaluation.

Author

Peter Wenger, MD Peter C. Wenger, MD, is an orthopedic and non-operative sports injury specialist at Princeton Sports and Family Medicine, P.C., in Lawrenceville, New Jersey. He is board certified in both family medicine and sports medicine. Dr. Wenger brings a unique approach to sports medicine care with his comprehensive understanding of family medicine, sports medicine, and surgery. As a multisport athlete himself, he understands a patient’s desire to safely return to their sport.