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ACL Return to Sport

Updated August 17, 2026

Clearance

Return-to-play clearance: who decides, and on what

In the American system clearance is a document as much as a decision. Here is who signs, what they look at, how school and college rules interact with it, and how to make the conversation concrete.

There is no national return-to-play standard for ACL reconstruction. What exists is a chain of people, each with a different view of your knee, and a piece of paper at the end of it. Understanding the chain is how you stop being a passenger in it.

Who is in the chain

The surgeon
Signs the clearance. Owns the graft, the healing timeline and the surgical restrictions. Often sees you every few months, which means they see your knee less often than anyone else in this list.
The physical therapist
Owns the measurements. Strength, range of motion, effusion, hop tests, movement quality. This is where the numbers come from.
The athletic trainer
In high school and college, sees you daily, runs the on-field progression, and knows how the knee responds to real practice load. The most underused voice in the chain.
The team physician
In organized sport, may have the final say on participation regardless of your surgeon's letter.
You
The person who has to be honest about confidence, and the only one who is there every time the knee is loaded.

What clearance is usually based on

Time since surgery, the surgeon's judgement on healing, absence of effusion and full range of motion, strength and hop test symmetry where they were measured, and how the knee handles graded practice. In many American settings, the formal battery is thinner than the literature assumes: a lot of clearances happen at six months on a good clinical examination and a confident patient.

That is where the risk sits. Not meeting all six discharge criteria before returning to team training carried a hazard ratio of 4.1 for graft rupture in 158 professional athletes, and returning to knee-strenuous sport before 9 months carried a hazard ratio of 6.7 in a registry cohort of 159 athletes aged 15 to 30.

The three questions that change the conversation

What were my last measured quadriceps and hamstring numbers, on which leg, in which units? What is my hop test symmetry? What is my ACL-RSI score, and what was it three months ago? If nobody can answer those, the clearance is being made on impression.

Clearance is not a single event

  1. Step 1

    Medical clearance

    The surgeon's letter, which typically permits progression rather than full competition.

  2. Step 2

    Full non-contact practice

    Everything except contact, at full speed and volume, with the knee staying quiet.

  3. Step 3

    Controlled contact

    In sports that have contact, introduced deliberately rather than in a game.

  4. Step 4

    Full practice

    Complete participation with no restrictions, sustained for weeks rather than days.

  5. Step 5

    Graded competition

    Limited minutes before unrestricted play. This step is where graft ruptures concentrate: in one professional cohort they happened on average 105 days after return.

The paperwork side

  • High school athletics associations generally require a physician's written clearance before return after a surgical injury. The exact form is state and district specific.
  • College programs add their own medical staff, and the team physician's decision can override an outside surgeon's letter.
  • Keep copies of the clearance letter and of your measured numbers. Athletes change schools, clinics close, and records move slowly.
  • If you are cleared but do not feel ready, say it before the first game and not after. Low psychological readiness at 12 months in patients 20 or younger was associated with second injury, and an ACL-RSI under 76.7 identified 90% of those who went on to be reinjured in that age group.

If you disagree with the decision

Both directions happen. If you are cleared and do not trust the knee, ask for the criteria to be measured rather than arguing about how you feel: a documented 78% quadriceps symmetry is an argument, and being nervous is not, even when being nervous is the correct response. If you are not cleared and want to be, the same tool works in reverse, and the honest version of that conversation is about what specifically has to change and by when.

The readiness check produces a one-page printable summary and a shareable link precisely so this conversation starts from a list rather than from a feeling.

Questions people actually ask

Who has to clear me to play again?
A physician signs the clearance, usually your surgeon. In organized sport a team physician may have the final say regardless, and in high school a state association form is often required. The physical therapist and athletic trainer supply the measurements that the decision should rest on.
Can I be cleared at 6 months?
It happens routinely and it is where the risk concentrates. Returning to knee-strenuous sport before 9 months carried a hazard ratio of 6.7 in one registry cohort, and graft ruptures in a professional cohort occurred on average 105 days after return. Being cleared and being ready are two different findings.
What if I am cleared but I do not feel ready?
Say so, and turn it into a measurement rather than a mood. Score the ACL-RSI, get your strength and hop numbers, and bring them. In patients 20 or younger, low psychological readiness at 12 months was associated with second ACL injury, so that feeling is data.
Do I need a brace after clearance?
Many athletes wear one and the evidence that it prevents a second ACL injury is not strong. It is a comfort and confidence decision more than a protective one, and it does not substitute for strength, mechanics or time.