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Topic Hub · Timelines are risk curves.

Sports Medicine.

Injury, surgery and return-to-play, reported as probability rather than calendar.

Personalized feedUpdated · 2026-07-08

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The Standard on Sports Medicine

Return-to-play is where medicine, contract value, and impatience collide. The literature is clear that timelines are risk curves, not calendars — and the difference costs careers.

What this field actually measures

Return-to-sport timeline (ACL)

Time from reconstruction to unrestricted competition.

ReferenceCommonly 9–12 months, with criteria-based clearance now favoured over time alone.

Re-injury risk

Probability of a second injury after returning.

ReferenceYounger athletes returning to pivoting sport show substantially elevated second-ACL rates, and risk falls markedly with each month of delay past nine.

LimitRisk is a distribution. Individual clearance still needs individual testing.

Limb symmetry index

Injured limb output as a percentage of the healthy limb.

Reference≥90% is the conventional clearance floor across hop and strength batteries.

LimitSymmetry can be achieved by the healthy limb getting worse.

Evidence & metrics

The published work behind the numbers above, and the public datasets you can open to check us. If a claim can’t be traced here, we don’t print it.

Citations

  1. Delaying return to sport after ACL reconstruction reduces reinjury risk

    Grindem, Snyder-Mackler, Moksnes, Engebretsen & Risberg — British Journal of Sports Medicine · 2016

    Each month of delayed return up to nine months reduced reinjury rate, and passing return-to-sport criteria cut reinjury further.

  2. IOC consensus statement: methods for recording and reporting injury and illness in sport

    International Olympic Committee — British Journal of Sports Medicine · 2020

    Standardises injury definitions and exposure denominators so injury rates can be compared across sports.

Datasets

  • NCAA Injury Surveillance Program

    NCAA / Datalys Center · free summaries

    Injury rates per athlete-exposure across college sports and seasons.

  • NEISS injury surveillance

    US Consumer Product Safety Commission · free

    Emergency-department sample of sport and recreation injuries, updated annually.

Still open

  • Which return-to-play test batteries actually predict re-injury rather than describe recovery?
  • How should load history be weighted against tissue healing time?
  • What is the long-term joint-health cost of accelerated timelines?

What we won’t say

We will not describe an athlete as 'ahead of schedule.' Schedules are marketing; tissue has its own opinion.

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  • VO-2Punch at claims, never at people
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