I Hurt One Knee — Should I Lower the Weight on Both Sides?
You’re doing your regular workout when your left knee starts hurting. Your physical therapist or trainer recommends cutting the weight in half while you recover.
But then you wonder:
“What about my right knee? It feels fine. Should I use the lighter weight on both sides, or keep my regular weight on the right?”
The answer isn’t always as simple as using the same weight on both sides. It depends on the exercise, your injury, your symptoms, and your rehabilitation goals.
Don’t Automatically Train the Stronger Side at Your Regular Weight
When one knee is injured, it can be tempting to keep training the uninjured side as usual.
After all, your right knee feels fine—so why not keep using your normal weight?
The problem is that your body doesn’t always work in isolation. During many exercises, your hips, core, and opposite leg help stabilize and control movement. Using significantly more weight on one side may change your movement pattern or create compensations.
Depending on the exercise, your physical therapist may recommend reducing the load on both sides, using a lighter weight, or temporarily changing the exercise altogether.
What If One Side Is Stronger Than the Other?
Having some differences between your left and right sides is normal. But when one side is injured, the difference can become more significant.
Instead of focusing only on matching the weight, your rehabilitation may focus on restoring:
- Strength
- Mobility
- Balance
- Stability
- Coordination
- Proper movement mechanics
The goal isn’t simply to get back to your old weight as quickly as possible. It’s to gradually rebuild your ability to handle that load safely and confidently.
When Can You Increase the Weight Again?
Increasing weight should generally be based on more than whether the exercise feels easy.
Your physical therapist may consider factors such as:
- Pain during and after exercise
- Swelling or other symptoms
- Your strength and control
- Your movement quality
- How the knee responds later that day or the following day
- The stage of your recovery
If your knee tolerates an exercise well and you can perform it with good form, your therapist may gradually increase the resistance.
Progressive loading is part of recovery—but progression should be appropriate for your current level of function.
What About the Uninjured Knee?
This is where individual guidance matters.
In some situations, you may be able to continue strengthening the uninjured side. In others, using the same regular weight could place unnecessary demands on your body or interfere with your overall movement strategy.
Your physical therapist can help determine whether you should:
- Use the same lighter weight on both sides
- Use different weights for each side
- Modify the exercise
- Reduce the number of repetitions
- Temporarily avoid a particular movement
- Gradually increase the load as your injured knee improves
There isn’t one answer that applies to every knee injury.
Don’t Let Your Strong Side Outpace Your Recovery
When you’re eager to get back to your normal workouts, it can be frustrating to reduce the weight.
But recovery isn’t about proving how much weight you can lift today. It’s about gradually rebuilding your capacity so you can return to the activities you enjoy.
If one knee is injured, don’t assume that your uninjured side should automatically continue with your regular weight.
Your physical therapist can help you determine the appropriate load and progression for your specific situation.
Need Help With a Knee Injury?
At Transitions Physical Therapy & Wellness Center, we can help you understand what’s contributing to your knee pain and develop an individualized plan to improve strength, mobility, and function.
If knee pain is affecting your workouts or everyday activities, contact us to schedule a comprehensive physical therapy evaluation.
Call or text 407-446-2328.
Transitions Team
Physical Therapist / Mobility & Wellness Advocate