Rehab & return-to-play testing: the objective approach
Why time-based rehab fails, how limb symmetry and strength benchmarks guide progression, and how clinicians measure them outside the lab.
Reviewed by Dr Tom Samuel - Principal Clinical Lead at REMAKER
Why you can't you only rely on time?
Two athletes at twelve weeks post-surgery can be in completely different places: one has rebuilt strength close to their uninjured side, the other is masking a large deficit with compensation you can't see. Progressing rehab on time alone ("it's been six weeks, move to phase three") is how athletes end up back in sport with deficits that cause re-injury.
What should be tested in each phase?
The measurement defines the phase. A typical criteria-based structure:
- Early phase - pain-free isometric force at gentle joint angles; the goal is re-establishing baseline output and watching asymmetry shrink week on week.
- Mid phase - maximal isometric strength (e.g. knee extension, hamstrings, adductors) approaching the uninjured side. Rate of force development becomes more relevant here as explosiveness lags behind strength.
- Late phase / return-to-play - RFD approaching the uninjured side, and sport-specific loading tolerated without a next-day symptom response.
How do clinicians measure this outside a lab?
Isokinetic dynamometers and force plates live in labs and elite clubs. Portable strain-gauge dynamometers closed that gap, and treatment rooms were able to measure maximal force and RFD in seconds.
REMAKER LINK is built for this: a validated strain-gauge dynamometer (r = 0.9999 against an industrial reference - for more info see the validation data) with app-guided tests for the key rehab measurements. It's how performance coach John Lantigua of Tread Athletics runs objective testing with his athletes (John's story).
FAQs
Can I use the uninjured side as a baseline?
Where possible, anchor decisions to pre-injury baselines or normative values for the sport as well as side-to-side comparison.
Is isometric testing safe early in rehab?
Generally yes. Force builds gradually under the patient's own control with no impact and no movement through range, so testing can start far earlier than jump- or movement-based assessments. Work within the ranges and pain limits set by the treating clinician.
Put it into practice.
Everything in this guide is measurable with REMAKER - validated against gold-standard equipment, in the gym, clinic or field.