Passing a test battery is evidence. It is not an insurance policy.

The phrase “passed return-to-sport testing” sounds definitive. Usually it means someone met selected criteria under particular conditions on a particular day. That is useful information, but it is narrower than the phrase suggests. I want testing to become more influential in rehabilitation, not less; that requires being honest about what each result does and does not establish.

Define the destination before the test

The 2016 Bern consensus describes a continuum from return to participation, through return to sport, to return to performance. These are not interchangeable milestones. Modified practice can be a successful step while remaining some distance from unrestricted competition or previous performance levels.

A test battery should therefore begin with a stated decision. Is the question whether to introduce running, join controlled drills or resume full competition? The same measures may contribute at several stages, but their interpretation changes. Without a defined destination, “ready” becomes a word that different members of the team use to mean different things.

Choose complementary measures

Strength testing can identify force deficits. Jump and hop tasks can describe aspects of power and task performance. Questionnaires can structure discussion of symptoms and psychological readiness. Field exposure provides evidence about tolerating the actual demands of the sport. No single category substitutes for all the others.

Even within a category, outputs are not equivalent. Hop distance does not directly reveal knee loading, and a peak force value does not describe how rapidly that force was developed. Collecting more variables is not automatically better. I would ask what decision each measure informs and whether its reliability is adequate for that purpose.

Ratios need a reference check

Limb symmetry indices compare sides and are common in lower-limb rehabilitation. A result near symmetry may be reassuring, but it can conceal bilateral weakness or a decline in the comparison limb. Previous measurements and appropriate absolute benchmarks help, provided they were collected using sufficiently comparable methods.

Thresholds are also vulnerable to measurement noise. A small change around a pass mark may reflect familiarisation, fatigue or ordinary test variation rather than a meaningful biological improvement. Standardised warm-ups, instructions, equipment and rest periods make repeated assessments more interpretable. The protocol is part of the result, not a disposable administrative detail.

Prediction is a higher bar

Losciale and colleagues’ systematic review and meta-analysis examined the association between passing return-to-sport criteria and second ACL injury risk. The available evidence did not justify treating passing as protection against every subsequent ACL injury. Differences in batteries, populations and follow-up complicate the overall interpretation.

That does not prove testing is pointless. A measure can identify a remediable deficit without accurately predicting a relatively uncommon future event. My objection is to the leap from “this person demonstrates better function” to “this person is now safe”. Function, exposure and future injury are connected questions, not identical outcomes.

Bring the environment back in

A quiet testing room removes opponents, tactical decisions and competitive pressure. That can improve measurement consistency while reducing resemblance to sport. Later-stage field work addresses some of this gap, but it should remain planned and appropriate rather than becoming an improvised stress test designed to provoke failure.

Repeated training exposure adds information about recovery between sessions, confidence and the ability to sustain performance. It also allows the athlete, clinician and coach to compare expectations with observation. Documenting restrictions and the next review point is more useful than a binary status that conceals all remaining conditions.

Make the decision legible

A good decision record states the intended activity, relevant findings, outstanding deficits, completed exposures and the people involved. It explains uncertainty in language the athlete understands. Competitive pressure and personal preferences can be discussed openly without pretending that preference changes tissue capacity.

I regard testing as a recurring checkpoint in a longer process. Its strongest contribution is to make progression more transparent and identify what still needs work. This report cannot clear anyone to play. An individual return decision belongs with the athlete and appropriately qualified professionals who know the injury, the sport and the consequences of getting the timing wrong.