Exercise is one of the best things you can do for knee arthritis. It strengthens the muscles that support your joint, improves flexibility, and can actually reduce pain over time. But not every exercise is a good fit when your knees are already inflamed and irritated.
Choosing the wrong movements can increase swelling, accelerate cartilage breakdown, and make your symptoms worse. At Core PT in Evansville, WI, we help patients with knee arthritis stay active without aggravating their joints. Here are the exercises you should think twice about and what to do instead.
Exercises That Can Make Knee Arthritis Worse
Deep Squats and Lunges
Squats and lunges are staple lower body exercises, and they are not off-limits entirely if you have arthritis. The problem comes when you go too deep. Once your knee bends past 90 degrees, the compressive force on the joint increases significantly. For an arthritic knee with thinning cartilage, that extra compression can trigger pain and swelling.
Deep lunges create a similar problem, especially when your front knee travels well past your toes. Walking lunges add the challenge of balance and impact with each step, which can be a lot for an irritated joint to handle.
What to do instead: Stick to partial squats where your knees stay at or above 90 degrees. Wall sits are a great option because they let you control the depth precisely. If you want a lunge alternative, try reverse lunges with a shorter range of motion. They put less shear force on the knee than forward or walking lunges.
High-Impact Running
Running on hard surfaces sends repetitive shock through your knee joints with every stride. If your cartilage is already worn down, that impact has less cushioning to absorb it. This does not mean you can never run again, but logging high mileage on pavement when your knees are flared up is not doing you any favors.
Trail running on softer surfaces is slightly better, but the uneven terrain introduces its own risks if your knee stability is compromised.
What to do instead: Swap running for low-impact cardio options that still get your heart rate up. Cycling is excellent because it strengthens your quads and improves range of motion with minimal joint compression. Swimming and water walking are even better since the buoyancy of the water takes pressure off your knees entirely. Our aquatic therapy program is specifically designed for patients who need to stay active while reducing load on their joints.
Leg Extensions with Heavy Weight
The seated leg extension machine isolates your quadriceps, which sounds great in theory. Stronger quads support the knee joint. But the way this machine loads your knee creates a lot of shear force across the joint, particularly in the last few degrees of extension. For a healthy knee, this is usually fine. For an arthritic one, it can irritate the joint surfaces and increase inflammation.
What to do instead: Straight leg raises are a much safer way to build quad strength without stressing the joint. Lie on your back, lock your knee straight, and lift your leg about 12 inches off the ground. You can add ankle weights as you get stronger. Terminal knee extensions with a resistance band are another good option. They target the same muscles through a smaller, more comfortable range of motion.
Plyometrics and Jump Training
Box jumps, jump squats, burpees, and other plyometric exercises generate huge forces through your knees on both the takeoff and the landing. These movements are designed to build explosive power, but that power comes at the cost of high joint impact. For someone with knee arthritis, the risk far outweighs the reward.
Even lower-level plyometrics like jump rope can be problematic during a flare-up because of the repetitive, cumulative impact.
What to do instead: If you want to build lower body power without the pounding, try resistance band exercises or controlled step-ups onto a low box. These build functional strength through similar movement patterns without the jarring landings. Kettlebell deadlifts and glute bridges are also great for building posterior chain power with zero impact on the knees.
Deep Knee Bend Stretches
Stretches like the hero pose in yoga or deep kneeling positions that force your knee into maximum flexion can compress the joint beyond what arthritic cartilage can tolerate. You might feel a good stretch in your quads, but you are also grinding bone surfaces together in the process.
What to do instead: Stretch your quads standing up by pulling your heel toward your glute while keeping your knees close together. Use a wall or chair for balance. For hip and hamstring flexibility, seated or lying stretches keep the knee in a comfortable range while still improving the mobility you need.
General Guidelines for Exercising with Knee Arthritis
Pain during exercise is not something you should push through when you have arthritis. A little stiffness at the start of a workout that fades as you warm up is normal. Sharp pain or swelling that lasts into the next day means you did too much or chose the wrong exercise.
Start with lower intensity than you think you need and build gradually. Warming up is especially important because arthritic joints take longer to loosen up. Five to ten minutes of gentle movement before your workout can make a big difference in how your knees feel during and after.
Consistency matters more than intensity. Three to four moderate sessions per week will do more for your knees over time than one aggressive session that leaves you sore for days.
When to Work with a Physical Therapist
If you are not sure which exercises are safe for your specific situation, working with a physical therapist takes the guesswork out of it. Arthritis affects every knee differently depending on which compartment is involved, how much cartilage loss there is, and what other factors like muscle weakness or alignment issues are at play.
At Core PT, our team builds individualized exercise programs for patients with knee arthritis based on a thorough evaluation of your joint, your movement patterns, and your goals. Whether you want to get back to hiking, keep up with your grandkids, or just walk without pain, we can help you get there safely.
Our senior fitness programs are also a great option if you are looking for guided group exercise in a supportive setting.
Contact us to schedule an evaluation and start building a plan that works for your knees, not against them.