Return to Sport: When Are You Actually Ready?
Motion Theory Clinical Team
Registered Physiotherapists · Vancouver BC
Direct Answer
You are ready to return to sport when you meet three objective criteria: bilateral strength symmetry within acceptable ratios (≥90% limb symmetry index), symptom-free performance at sport-specific loads, and psychological readiness assessed formally. These criteria should be set at the beginning of rehabilitation — not estimated at the end.
Readiness for sport is not a feeling. It's a set of measurable thresholds — strength ratios, movement quality, task-specific performance — that either exist or don't. When a patient says 'I think I'm ready,' they're describing their perception of their capacity. What we need to know is whether that perception is accurate.
The Gap Between Perception and Capacity
This gap is where most reinjuries happen. A runner whose hamstring has healed 'enough' to run comfortably at easy pace has not necessarily healed enough to accelerate aggressively from a standing start, or to absorb impact load across 10km on tired legs. The capacity required for sport is not the capacity required for daily life. Confusing the two is a clinical error.
The Criteria That Actually Matter
Return-to-sport clearance should confirm:
- Limb Symmetry Index (LSI) ≥90%: Injured limb producing at least 90% of the force output of the uninjured side on relevant measures — quad peak torque, hamstring strength, single-leg hop testing.
- Sport-specific task completion: The athlete can execute the actual demands of their sport without symptom provocation, compensation, or subjective hesitation.
- Psychological readiness: Formal assessment of movement confidence and fear-avoidance behaviours — independent predictors of reinjury.
- Graded load history: A graduated return to training volume rather than sudden re-entry at pre-injury loads.
"We use return-to-sport criteria drawn from the sports science literature — not clinical feel, and not patient report alone."
What We See in Clinic
Athletes who present after reinjury consistently report the same clearance conversation: 'The physio said I looked good.' Looking good is not a criterion. We've assessed patients who 'looked good' and measured quad LSIs below 70% — meaning one leg was producing less than 70% of the force of the other. That is not sport-ready. That is injury-ready.
What to Do Next
If you are approaching return to sport after any significant injury, insist on objective testing before clearance. If your program doesn't include hop testing, force measurement, or sport-specific task assessment, you're being cleared based on feel. That's not good enough.
Build a plan with objective outcomes.
Every patient at Motion Theory starts with a structured baseline assessment — so you know exactly where you are and what recovery looks like.
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Frequently Asked Questions
How long does it take to return to sport after a knee injury?
Timeline depends entirely on the injury. An ACL reconstruction typically requires 9–12 months before safe return to high-demand sport. A grade II lateral ankle sprain may allow return in 4–6 weeks. The relevant variable is not time but whether objective return-to-sport criteria have been met.
What is the limb symmetry index for return to sport?
The limb symmetry index (LSI) measures force output of the injured limb as a percentage of the uninjured limb. A minimum of 90% is the standard clinical benchmark for return to sport following lower limb injury. Below 90%, reinjury risk is significantly elevated.
Can I return to sport with knee pain?
Pain during sport-specific activity is generally a contraindication to return. However, mild discomfort during rehabilitation loading is often appropriate and expected. The distinction is between adaptive loading discomfort (acceptable) and tissue provocation pain (not acceptable). Your physiotherapist should be clear about which category your symptoms fall into.
What is a graded return to sport protocol?
A graded return protocol progressively reintroduces sport-specific demands: starting with straight-line running at reduced intensity, advancing through change-of-direction work, contact simulation, and finally full practice and match/game scenarios. Each step requires 24–48 hours of no adverse symptom response before progression.
Do I need physiotherapy clearance to return to sport?
Formal physiotherapy clearance is strongly recommended following any significant musculoskeletal injury. For high-demand sports — running, team sports, contact sports — objective criteria should be confirmed before return. Many serious reinjuries occur in the absence of this process.
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Clinic Location & Access
Located at 1367 West Broadway in Vancouver, Motion Theory is situated in the Fairview medical corridor, in close proximity to Vancouver General Hospital (VGH). We serve patients from Kitsilano, Mount Pleasant, and the broader Metro Vancouver area.