Return to Impact After Total Knee Replacement: A Practical Framework
This is the clinician-side problem:
Patients do not ask for “low-impact aerobic activity.”
They ask:
“Can I squat heavy?”
“Can I jog again?”
“Can I play basketball with my kids?”
“Can I ski?”
“Can I get back to pickleball?”
“Can I jump?”
“Can I do CrossFit?”
The evidence gives us broad categories.
Clinical reasoning has to fill in the gaps.
Step 1: Separate the activity by demand, not by name
The question is not simply, “Is this sport allowed?”
The better question is:
What does this activity require from the knee?
Lower-demand activities
Usually reasonable earlier:
Walking
Cycling
Swimming
Elliptical
Controlled resistance training
Golf
Low-intensity hiking
Doubles tennis, depending on skill and movement demand
Moderate-demand activities
Often reasonable later, especially with prior experience:
Hiking uneven terrain
Skiing for experienced skiers
Pickleball
Recreational tennis
Higher-load strengthening
Faster walking/hill work
Controlled agility drills
Higher-demand activities
Need caution and a clear discussion:
Running
Jumping
Basketball
Soccer
Singles tenni
High-impact aerobics
Plyometrics
Competitive cutting sports
Heavy repetitive occupational loading
The activity label matters less than the combination of:
Impact + volume + speed + fatigue + unpredictability + fall/contact risk.
