According to the Centers for Disease Control and Prevention (CDC), over 32.5 million Americans live with osteoarthritis (OA). As the most common form of joint disease, OA frequently affects weight-bearing synovial joints like the hips and knees—making everyday tasks like walking, climbing stairs, or getting out of a chair feel frustratingly painful.

If you’ve been told you have “wear and tear” or “bone-on-bone” knee arthritis, it can sound intimidating. However, knee OA is extremely common, and exercise is proven to be one of the most effective ways to manage joint stiffness and reduce pain.

At Threshold PT, our physical therapy team uses evidence-based exercise routines and movement strategies to keep your knee joints lubricated, strong, and capable of handling daily life without the knee for surgery.

What Is Knee Osteoarthritis?

Osteoarthritis is a progressive condition involving the breakdown of cartilage—the slick protective tissue that cushions the ends of your bones inside a joint. As cartilage wears down, the underlying bone adapts, which can cause surface friction, intermittent swelling, dull aching, and joint crepitation (cracking or grinding noises). We tend of think of it as an internal wrinkle – something is typically happens has we age.

Common Symptoms of Knee OA

• Morning Joint Stiffness: Feeling locked up for the first 20–30 minutes after waking.
• Activity-Related Aches: Deep, dull pain during or after prolonged standing, walking, or stair climbing.
• Joint Swelling & Warmth: Intermittent fluid buildup around the knee after increased activity.
• Instability: Feeling like the knee is “giving out” or loose during movement.

Debunking the Myth: OA is rarely caused by simple “wear and tear.” It is more frequently linked to prior joint trauma (like a knee injury), structural alignment variations, genetic factors, or systemic inflammation.

Why Exercise Is the First Line of Defense for Knee OA

A common misconception is that exercising a joint with osteoarthritis will cause “more damage.” In reality, medical research consistently demonstrates that targeted load-bearing exercise is completely safe and highly beneficial for arthritic joints.

What the Research Says

1. Cornerstone Care: Clinical guidelines rank exercise, education, and weight management as the top non-surgical treatments for knee OA—ahead of pain medications and injections.
2. As Effective as Injections: A landmark study published in the Annals of the Rheumatic Diseases found that an 8-week structured exercise and education program was as effective as saline joint injections at reducing pain and restoring function.
3. Cartilage Health: Research shows that controlled strengthening exercises do not harm joint cartilage. Instead, muscle contractions act like a pump, moving fluid and nutrients into the cartilage to keep the joint healthy.

5 Essential Exercises for Knee Osteoarthritis

The goal of physical therapy for knee OA is to strengthen the muscles surrounding the knee (quadriceps and hamstrings), improve hip and ankle mobility, and enhance single-leg balance.

Other Medical Treatments for Knee OA

While physical therapy is the primary conservative solution, a comprehensive approach may include:

• Low-Impact Aerobics: Cycling, aquatic exercise, or swimming to maintain cardiovascular fitness without joint stress.
• Topical & Oral Anti-Inflammatories: Short-term NSAID use managed by your physician during acute flare-ups.
• Viscosupplementation or Corticosteroid Injections: Administered by an orthopedic specialist to calm severe joint inflammation.
• Joint Replacement Surgery: Evaluated when conservative treatment options no longer support functional mobility or quality of life.

Key Takeaways

1. Exercise is safe: Movement keeps joint fluid circulating and strengthens surrounding shock-absorbing muscles.
2. Build quad and hip strength: Stronger thigh and glute muscles take direct compressive load off the arthritic knee joint.
3. Pacing is key: Start with low-impact, controlled movements and progress gradually under professional guidance.