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Marx · Marx Activity Rating Scale

4 items · 2 min · 0–16 · higher is better

1 Before you use it

What it is

Four items — running, cutting, decelerating and pivoting — each rated for how often it was performed in the last year at the patient's healthiest.

Frequency-based rather than level-based, which makes it a cleaner measure than Tegner for a knee that has to cut and pivot.

When to reach for it

ACL and meniscal populations, alongside or instead of Tegner — the four named movements map directly onto the return-to-sport battery.

Patterns it serves · 2

2 Giving it

Scoring

Four items, 0–4 each, totalling 0–16. Higher means more frequent high-demand activity.

What it doesn’t measure

Symptoms, function or readiness.

3 Reading the score

Interpreting it

Like Tegner, it is context for interpreting other scores.

Is the change real?

No verified MCID or MDC is carried in our library for this measure, so the number on its own cannot tell you a change is real. Compare it to this patient's own baseline and say what changed functionally.

Student trap. Scoring it on current activity. It asks about the last year at their healthiest — that's the baseline you're aiming to restore.

Official source: aaos.org. We don't host the form.

This is a learning tool. It does not diagnose patients and does not replace your clinical educator.

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