Return to Sport: Which Tests and Which Thresholds?
How the return-to-sport decision is made: strength symmetry, hop testing, movement quality and psychological readiness.
Contents
The most consequential decision after an injury is when to return. Made by the calendar, it increases re-injury risk; made by measurement, it reduces it. Below is the testing framework I use in clinic.
Return is not a single moment
- Return to activity: performing the basic movements of the sport without pain.
- Return to sport: full participation in team training.
- Return to performance: playing at the pre-injury level.
Separating these three keeps expectations realistic. Training with the team does not mean being ready for competition.
The test battery
1. Strength
The foundation. Isokinetic dynamometry gives the most detail; handheld dynamometry and load cells are practical alternatives.
- Target: 90% or more symmetry compared with the uninvolved side
- Both concentric and eccentric assessment
- For the knee, the hamstring-to-quadriceps ratio is also considered
2. Hop tests
| Test | What it measures | | --- | --- | | Single hop for distance | Single-effort power | | Triple hop | Tolerance of repeated loading | | Crossover hop | Control during direction change | | 6-metre timed hop | The speed component |
The 90% threshold applies again — but landing quality is recorded alongside distance. An athlete who matches the distance while the knee collapses inwards has not passed.
3. Movement quality
Video analysis of single-leg squat, landing and change of direction, looking for dynamic valgus, trunk shift, insufficient hip and knee flexion, and clear asymmetry.
4. Cardiovascular readiness
Technically ready but poorly conditioned athletes lose movement quality as fatigue builds. Repeating tests under fatigue is therefore valuable.
5. Psychological readiness
Fear of re-injury changes movement patterns directly. Low scores on validated scales are a reason to revisit the return decision.
Interpreting results
Testing supports the decision rather than replacing it. Injury type, the demands of the sport, the point in the season and individual risk factors are all weighed alongside the numbers. Two athletes with identical scores can receive different advice.
After the return
- Increase training load gradually — sudden jumps are the main source of risk
- Keep strength work at one to two sessions per week
- Repeat testing every one to three months
- Monitor pain and swelling responses
For injury-specific pathways, see the ACL rehabilitation article.
Frequently asked questions
No. A single test is misleading — an athlete can pass one and fail another badly. Strength, hop performance, movement quality and psychological readiness are assessed together.
A side-to-side difference below 10% is a widely accepted threshold. Remember that the uninvolved side also weakens during rehabilitation, so comparing with pre-injury values is better where available.
Yes, with validated scales such as the ACL-RSI. Athletes who pass physical testing but still distrust the joint have higher re-injury rates.
This article is for information only and does not replace a medical examination or professional medical advice. Please consult a physician about your symptoms.
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