Last reviewed: September 29, 2026

It depends mostly on which knee was replaced, and on when you can brake safely.

In an automatic car, only the right leg works the pedals, so people can usually drive sooner after a left knee replacement than after a right one. In a car with a clutch, the left leg works the clutch, so that head start does not apply.

Braking studies suggest it takes about four weeks after a right knee. After a left knee, if you drive an automatic, it can be as early as one to two weeks. One small study found braking strength was not fully back until six weeks after a right knee.

These studies test braking in simulators and test cars. None has linked those tests to real crashes, so the timing is a guide, not a guarantee.

In general:

  • Do not drive while you are still taking opioid pain medicine.
  • Your strength and reflexes should be back close to normal.
  • You should be able to brake hard and suddenly, and feel safe doing it.
  • Ask your surgeon before you start.

Drafted with AI assistance from published sources, reviewed and edited by Babak Sheikh, MD.

Sources:

This is general information about what published research shows. It is not medical advice and it is not about your situation. Reading it does not create a doctor-patient relationship with me. I am a retired orthopedic surgeon and I do not see patients. Talk with your own doctor before changing anything about your care. If something feels suddenly or seriously wrong, get medical care promptly rather than waiting.

This page is provided as is. I make no guarantee that it is accurate, complete or current, and medical evidence changes. Use of it is at your own risk.

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