Running After ACL Surgery: When Your First Jog Comes, and What It Tells You About Work

The story below is a composite of real experiences; details changed.

Week 13. Marcus finishes his single-leg squats, and his PT writes something on the clipboard.

“If your numbers hold, we’ll try a jog on the treadmill next week.”

Marcus is 38, a union carpenter on commercial jobs, three months out from ACL surgery. He’s on light duty, running cut lists from a folding table.

His first thought isn’t the treadmill. It’s the ladder by the stairwell.

“So if I can jog, can I climb?”

His PT shakes her head. “Different test.”

Here’s when the first jog usually comes, what clinics check before they clear it, what a first run-walk looks like, and what it does and doesn’t tell you about ladders, step-downs and uneven ground.

When the first jog usually comes

Patient guides cluster around month 3. New Zealand’s ACL registry says jogging comes after 3 months, “in general terms.” (New Zealand ACL Registry)

One NHS physical therapy team has you working toward a slow treadmill jog by the end of its 6-week-to-3-month stage. Starting to jog is an aim of its next stage, 3 to 6 months. Its rule: don’t move on until your outpatient physical therapist says so. (University Hospitals Sussex, 2025)

One US hospital’s protocol puts its return-to-running program in a phase that runs 3 to 5 months after surgery. (Mass General Brigham, 2024)

The research says the same. A 2018 scoping review looked at 201 studies of adults with grafts from their own tissue. The median time programs allowed running was 12 weeks. The range ran from 5 to 39 weeks. Studies of only patients over 40 were left out. (British Journal of Sports Medicine, 2018)

A 2023 sports medicine guideline noted that 12 weeks was the proposed minimum, but some studies suggested 8 or 16. It found no conclusive results on whether running at or before 12 weeks is safe. (British Journal of Sports Medicine, 2023)

Month 3 is when the jog comes up. It’s a time to ask, not a green light.

What clinics check before they clear it

Most programs go by the calendar. In that 2018 review, fewer than 1 in 5 studies named any clinical, strength or performance test for running. The most common checks were knee bend, swelling and pain. (British Journal of Sports Medicine, 2018)

The 2023 guideline’s panel went further. Its authors said they had no research findings to lean on, but felt a test list was warranted. Before running, it suggests:

• A knee that straightens fully, and bends at least 95% as far as your other one.
• No swelling, or only a trace.
• Quad strength over 80% of your other leg.
• Over 80% even between legs in the force of the dip of a two-footed jump.
• Pain-free jogging in a pool or on an anti-gravity treadmill.
• Pain-free repeated small hops on the operated leg.

Twenty-nine reviewers, mostly physical therapists and surgeons, rated those criteria. Average agreement was 87.8%. (British Journal of Sports Medicine, 2023)

Before its running phase, the Mass General Brigham protocol asks for quad strength over 80% of your other leg, and hamstring and glute strength of at least 80%. To leave the phase before running, it also asks for no episodes of the knee giving way and 10 single-leg squats with good form. (Mass General Brigham, 2024)

Your graft can change the quad number. In a records study of 125 patients, quad strength was more even between legs with a hamstring graft than with a kneecap-tendon or quad-tendon graft. (International Journal of Sports Physical Therapy, 2022)

Quad stuck below the line? Read why a quad won’t fire after knee surgery.

The calendar tells you when to ask. Your knee’s numbers tell your PT whether to say yes.

What a first run-walk looks like

A first run is mostly walking. Here’s week 1 of the Mass General Brigham return-to-running program:

• Walk 15 minutes to warm up.
• Walk 5 minutes, jog 1 minute. Do that 5 times.
• Walk 10 minutes to cool down.

Later in week 1, it shifts to walk 4, jog 2. By week 3 it reaches walk 1, jog 5, before moving to continuous runs. It says to progress only if there’s no pain or swelling during or after the run.

It also says to run on softer surfaces early, do non-impact work on off days, add distance before pace, and raise weekly mileage by no more than 10%. (Mass General Brigham, 2024)

A 2023 review in Aspetar’s sports medicine journal gives a back-off rule. If pain goes up during or after a run, or swelling is more than a trace, stop running for 2 days. Cross-train, like a stationary bike. Then restart one step back. Its author has runners check swelling with a swipe test. Ask your PT to show you. (Aspetar Sports Medicine Journal, 2023)

What the jog tells you about work

A run-walk is a straight-line test. If pain and swelling don’t go up, your knee handled that load. That’s real progress.

But Marcus’s job asks other questions. Here’s our read of what each task needs. It’s not from a study.

The guides treat them as separate tracks too. New Zealand’s registry lists carrying loads on uneven ground and climbing ladders at 2 to 3 months, before jogging at 3. With very heavy duties, or work that needs agility on uneven ground, full duty may take 4 months or more. (New Zealand ACL Registry)

Twisting comes later. One NHS leaflet says to avoid twisting and kneeling for the first 4 to 6 months. The registry says a full return to pivoting sports usually takes at least 9 months. (West Suffolk NHS, 2024; New Zealand ACL Registry)

In the Mass General Brigham protocol, the run program sits inside a phase you leave only after hop tests at 90% or more of your other leg. In that protocol, the jog comes first, the hop tests after. (Mass General Brigham, 2024)

Planning the rest of the climb? See going back to physical work after ACL surgery. And if the jog feels fine but the ladder still scares you, read you used to trust your body.

A good jog says your knee can take straight-line impact. Ask your PT which test stands for each job you do.

What should make you call early

Pain or swelling that creeps up after a run means back off, using the rule above. These signs are different. Don’t wait for your next visit.

Walk five, jog one

The next Thursday, Marcus steps onto the treadmill. Walk 5, jog 1. The first jog minute feels clumsy, like his legs forgot the beat.

By the fifth round, it feels like running.

The next morning, he checks before work. Swelling the same. Pain the same. Stairs the same. He writes it down.

The foreman texts: “Heard you’re running. Ladders next week?”

Marcus types back: “Jogging a minute at a time. Ladders get their own test. Asking my PT which one on Thursday.”

“Copy that,” comes the reply.

Your next step: at your next PT visit, ask, “Which test clears me to jog, and which test stands for ladders?”

---

Marcus is a composite, drawn from the kinds of stories tradespeople describe after ACL surgery. The details are illustrative.