Ask most injured athletes when they’ll be back, and they’ll give you a date. Six weeks. Three months. Next pre-season. It’s a completely understandable way to think about recovery, and it’s also not how the tissue actually heals. A calendar tells you nothing about how much force a hamstring can produce eccentrically, how symmetrically a knee can absorb a landing, or whether a shoulder can stabilise under load. The athletes who come back faster, and stay back, aren’t the ones who wait the longest. They’re the ones who get tested.
This is the idea behind return-to-sport testing: replacing “does it feel okay?” with an objective number, measured against a normal value or against the uninjured side, before clearing someone for full training or competition. It sounds simple, and it is, but it consistently changes outcomes in ways that time alone doesn’t.
TESTING GETS YOU BACK FASTER, NOT JUST SAFER
There’s a common assumption that objective testing means a slower, more cautious return. In practice it often does the opposite. Athletes who are tracked against clear numeric targets, rather than a fixed timeframe, can sometimes be cleared earlier than a generic protocol would allow, because the criteria are about capacity, not the calendar. Just as importantly, testing identifies specific deficits, a weak eccentric hamstring, a hip that collapses under single-leg load, a shoulder that fatigues early under closed-chain demand, early enough that they can be trained out before return, rather than discovered the hard way mid-season.
THE SAME-SITE RISK: WHY OBJECTIVE CRITERIA MATTER
The clearest evidence for testing over timelines comes from ACL research, simply because it’s the most heavily studied return-to-sport pathway in sports medicine. A 2016 Delaware-Oslo cohort study by Grindem and colleagues, published in the British Journal of Sports Medicine, found that athletes who passed a battery of objective discharge criteria before returning to sport had an 84% lower rate of reinjury than those cleared on time alone. A related study by Kyritsis and colleagues found that athletes who returned without meeting all six clinical discharge criteria were four times more likely to rupture their graft again. These aren’t small effects, and there’s no reason to think the underlying principle, that objective testing outperforms subjective readiness, is unique to the knee.
THE ADJACENT-SITE RISK: WHY IT DOESN’T STAY WHERE IT STARTED
One of the more underappreciated findings in return-to-sport research is that an undertested injury doesn’t just risk reinjuring itself. It changes how load moves through the rest of the body. A 2016 systematic review and meta-analysis by Wiggins and colleagues, published in the American Journal of Sports Medicine, found an overall second ACL injury rate of around 15% in athletes returning to sport, split almost evenly between the same knee (7%) and the opposite knee (8%). For athletes under 25 returning to a high level of sport, that combined figure rose to around 23%.
That contralateral pattern reflects something we see across the kinetic chain more broadly: a joint or muscle that returns to sport underprepared forces the body to compensate somewhere else, whether that’s the opposite limb taking on more load, or a neighbouring muscle group, like the hip and groin picking up the slack for an undertested hamstring, absorbing force it wasn’t designed to manage. Testing every relevant joint, not just the obviously injured one, is how that hidden risk gets caught before it becomes the next injury.
THE LONG-TERM COST OF GETTING IT WRONG
The long-term picture is the hardest evidence to sit with, and also the most important reason to take testing seriously. A widely cited 2009 systematic review by Øiestad and colleagues, published in the American Journal of Sports Medicine, found that osteoarthritis develops in a substantial proportion of knees within 10 to 15 years of an ACL injury, regardless of whether the ligament is surgically reconstructed. Reconstruction and rehabilitation reduce the chance of the knee giving way again and needing a joint replacement later, but they don’t eliminate the long-term joint risk that follows the original injury.
What does appear to be modifiable is the number of additional insults the joint takes along the way, each further graft rupture, each additional cartilage or meniscus injury, each recurrent strain that leaves more scar tissue behind. That’s true of the knee specifically and, in principle, of every joint and muscle group covered in this series. Testing before return to sport is one of the few genuinely modifiable factors in that long-term trajectory. It won’t undo an injury that’s already happened, but it meaningfully reduces the odds of adding to it.
ONE TEST FOR EVERY MAJOR JOINT
We’ve put together evidence-based capacity tests for eight of the most common injury sites in sport, each one grounded in peer-reviewed research on what actually predicts safe, durable return to sport. Explore them below, or book an assessment and we’ll run the ones relevant to you.
Hamstring: The Nordic Curl Test
Calf: The Standing Heel-Rise Test
Knee/ACL: The Hop Test Battery
Shoulder: The CKCUEST
Groin: The Adductor Squeeze Test
Lumbar Spine: The Biering-Sørensen Test
Ankle: The Single-Leg Hop Test
Hip: The Single-Leg Squat Test
WHAT WE DO AT PRAXIS
Our sports physiotherapists build return-to-sport testing around the specific demands of your sport and the specific joint or muscle you’re recovering from, using the evidence-based capacity tests outlined above rather than a generic timeline. If you’re heading back to sport after an injury, book a return-to-sport assessment with our team and test it properly before you trust it.
Until next time, Praxis What You Preach…
📍 Clinics in Teneriffe, Woolloongabba, and Carseldine
💪 Trusted by athletes. Backed by evidence. Here for everyone.
References
Grindem H, Snyder-Mackler L, Moksnes H, Engebretsen L, Risberg MA. Simple decision rules can reduce reinjury risk by 84% after anterior cruciate ligament reconstruction: the Delaware-Oslo ACL cohort study. British Journal of Sports Medicine. 2016;50(13):804-808.
Kyritsis P, Bahr R, Landreau P, Miladi R, Witvrouw E. Likelihood of ACL graft rupture: not meeting six clinical discharge criteria before return to sport is associated with a four times greater risk of rupture. British Journal of Sports Medicine. 2016;50(15):946-951.
Wiggins AJ, Grandhi RK, Schneider DK, Stanfield D, Webster KE, Myer GD. Risk of secondary injury in younger athletes after anterior cruciate ligament reconstruction: a systematic review and meta-analysis. American Journal of Sports Medicine. 2016;44(7):1861-1876.
Øiestad BE, Engebretsen L, Storheim K, Risberg MA. Knee osteoarthritis after anterior cruciate ligament injury: a systematic review. American Journal of Sports Medicine. 2009;37(7):1434-1443.