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You Heard It Pop on a Crimp. Here’s What Just Happened and What It Costs.
A pop while crimping, then pain at the base of a finger on the palm side, is usually an A2 pulley injury. Most heal WITHOUT surgery. Expect roughly 6 weeks back to normal for a strain, about 3 months to full crimping for a partial tear, and closer to 6 months after a complete rupture. The exception is bowstringing, a tendon you can see lifting off the bone. That one needs imaging and a hand surgeon.
The crack. The sharp pain at the base of the finger, usually the ring finger. The swelling that turns up over the next day. And then the question every climber asks within the hour: how long am I off the wall?
Here’s the trap. A pulley injury stops hurting long before it’s healed. Two or three weeks in, the finger feels almost normal, the project is still up there, and you pull hard on a crimp again. That’s how a strain becomes a tear, and a single tear becomes a multiple-pulley rupture that needs a surgeon to rebuild.
Most of these do not need surgery. What they need is an accurate grade, because the grade decides whether you’re off crimping for four weeks or six months. Then they need a plan that respects the second clock, the one pain doesn’t tell you about.
What is the A2 pulley, and why does crimping tear it?
Your finger has no muscles in it. The tendons that bend it are pulled from the forearm, and a series of fibrous straps, the pulleys, hold those tendons flat against the bone as the finger bends. There are five main ones, A1 to A5. A2 sits over the first bone of the finger and is the biggest and strongest of them. See how the hand’s tendons work if you want the full map.
Without the pulleys, the tendon lifts away from the bone when you pull hard. That lifting is bowstringing, and a bowstrung tendon loses a large chunk of the power it can deliver to the fingertip.
The crimp grip is the problem. With the middle joint bent sharply and the fingertip joint pushed back, the tendon pulls away from the bone at an extreme angle, and the A2 pulley takes several times the force it sees in an open-hand grip.
Which is why this is a climber’s injury and almost nobody else’s.
(It’s also why the ring finger is the usual casualty. It generally carries the most load on a half-crimp and has the least independent control.)
Different pulley, different problem: the A1 pulley at the base of the finger in the palm is the one that thickens and catches in trigger finger. Same family of straps. Nothing like the same injury.
Is it an A2 pulley injury? The usual symptoms
- A pop or crack while pulling on a small hold, especially a full or half crimp, or when a foot slips and the fingers suddenly take your full weight.
- Pain on the palm side of the finger, over the first bone, between the knuckle at the base and the middle joint.
- Tenderness when you press there, and pain when you try to crimp or squeeze.
- Swelling and sometimes bruising over the next 24 to 48 hours.
- Ring or middle finger most of the time.
No pop doesn’t rule it out. Some pulley strains build up over a session with no single dramatic moment, just a sore finger the next morning.
The four grades, in plain terms
- Grade 1: the pulley is strained, not torn. Pain and tenderness, no structural failure.
- Grade 2: partial tear of A2, or a complete tear of one of the smaller pulleys.
- Grade 3: complete rupture of a single major pulley.
- Grade 4: multiple pulleys ruptured, with obvious bowstringing. This is the surgical one.
How is a pulley injury diagnosed?
- Examination: where it’s tender, whether the finger bends fully, whether the middle joint is swollen (a different injury), and a side-by-side look for bowstringing while you pull against resistance.
- Ultrasound: the workhorse test, and it’s genuinely good at this, because it can measure the gap between tendon and bone while you actively load the finger. A gap of around 3mm or more points to a complete rupture.
- MRI: the alternative when ultrasound isn’t available or the picture is unclear.
- X-ray: doesn’t show the pulley. It’s used when a fracture or a bone fragment pulled off with a tendon is possible.
How to check for bowstringing yourself
Bend the finger against resistance and look at the palm side of the finger in profile against a light background.
A visible cord lifting away from the bone as you pull, or a finger that has to bow oddly to make a full fist compared with the other hand, is bowstringing.
If you can see it, this isn’t a taping-and-hoping injury. Get it imaged.
Pain at the base of the finger is a question. A tendon you can see lifting off the bone is a clear answer.
How long does an A2 pulley injury take to heal?
These are typical ranges, the conservative version. Your grade, your age and your discipline about the first six weeks all move them. If your surgeon or therapist gives you different dates, use theirs.
- Grade 1: no crimping for around 2 to 4 weeks, easy open-hand climbing early, back to normal by about 6 weeks.
- Grade 2: no climbing for around 4 weeks, easy climbing from 6 to 8 weeks, full crimping around 3 months.
- Grade 3: protective taping or a pulley ring for 6 to 8 weeks, gradual return to climbing from around 3 months, full loading closer to 6 months.
- Grade 4: surgical reconstruction, then 6 to 9 months before full climbing loads, sometimes longer.
The uncomfortable part is that grades 1 to 3 all feel fine long before they are fine. Pain settles in weeks; the pulley remodels over months. That gap is where re-ruptures live.
In Closing Window terms, a grade 1 to 3 pulley runs on an OPEN window. Time and graded load are on your side, as long as you don’t spend them crimping early. Bowstringing is the one that shouldn’t wait: get imaged and in front of a hand surgeon within days, not after the trip.
A2 pulley rehab: week by week
This is the shape for a grade 2 injury. Shift it earlier for a grade 1, later for a grade 3. The rule throughout: pain during an exercise no higher than 3 out of 10, and settled by the next morning. If it isn’t, go back a step.
Weeks 0 to 2: protect it, keep it moving
- No climbing, no hangboard. Normal daily use is fine: typing, cooking, carrying light bags.
- Tape or a pulley ring for anything that loads the finger.
- Full fist and full straighten, 10 slow reps, 3 to 4 times a day. Pulley injuries stiffen quickly, and a stiff finger is a second problem stacked on the first.
- Tendon glides: straight hand, hook fist, full fist, tabletop, flat fist. 10 rounds, 3 times a day. See tendon glide exercises.
Weeks 2 to 6: start loading, open hand only
- Putty or soft ball squeezes with an open hand, 5-second holds, 10 reps, twice a day.
- Assisted hangs: feet on the floor or a chair, open-hand grip on a large, deep edge, taking only part of your weight. 10-second holds, 5 to 6 reps, 2 to 3 sessions a week. Take more weight off the feet only when the next day is quiet.
- Grade 1 climbers: easy open-hand climbing on big holds, well below your usual grade.
Weeks 6 to 12: back on the wall
- Easy climbing, open hand and drag grips, on jugs and slopers. This is the single biggest lever you have.
- Hangboard progression: full bodyweight hangs on a large edge, then smaller edges over weeks, still open hand.
- Half crimp on big holds only once open-hand hangs are pain-free, and only below your max grade.
3 months and beyond: the crimp comes back last
- Reintroduce the full crimp gradually, on easy terrain first.
- Keep taping for hard sessions for the first months back if it helps your confidence.
- Grade 3 injuries sit closer to 6 months before limit crimping.
Pure rest is the other way to get this wrong. It gives you a pain-free finger that fails the first time you crimp hard. Tendons and pulleys need graded load to rebuild.
How to tape an A2 pulley injury (H-taping)
Plain rings of tape around the base of the finger feel supportive…but they do very little to stop the tendon lifting off the bone. The H-tape does more.
- Cut a strip of rigid sports tape about 10 cm long and 1 to 1.5 cm wide.
- Cut a slit lengthways into each end, leaving about 2 cm uncut in the middle. You now have an H.
- Bend the finger slightly. Lay the uncut middle on the palm side, right over the crease of the middle joint.
- Wrap the two top legs around the base segment of the finger, over the A2, crossing on the back.
- Wrap the two bottom legs around the middle segment, crossing on the back.
- Snug, not tight. If the fingertip changes color or tingles, take it off and redo it.
Taping helps meaningfully more once you’re loading the finger again than it does in the first painful two weeks.
(Tape is a helper for the return-to-climbing phase. It isn’t a cast, and it does NOT make a fresh rupture safe to crimp on.)
A2 pulley rupture: the questions climbers ask
Do pulleys heal? Yes. Strains and partial tears heal well with graded loading. A complete rupture of a single pulley usually heals without surgery too, with protection and time. Multiple ruptures with bowstringing are the ones that get reconstructed.
Will it be as strong as before? Most climbers get back to their previous grade. The risk of re-injury is highest in the first months back…when it feels fine and isn’t yet.
Can I climb with a torn pulley? Easy open-hand climbing, often yes, depending on the grade. Crimping, no. Not until the progression above gets you there.
Can I keep working and training the rest of me? Desk work and typing, straight away. Jobs with heavy, sustained gripping, tape it and expect a few weeks of modified duties. See returning to work after a hand injury. Driving is usually fine from early on. In the gym, lower body and core carry on as normal. For pulling, use lifting straps and avoid narrow bars until open-hand hangs are pain-free.
When does a pulley injury need surgery?
- Multiple pulleys ruptured with clear bowstringing (grade 4).
- A single rupture that stays bowstrung, painful or weak despite a proper course of protection and rehab.
- What surgery involves: rebuilding the pulley, usually with a tendon graft, then protected movement with a ring or splint and hand therapy. Full climbing loads are 6 to 9 months away, sometimes longer.
What a hand therapist does differently
- Grades it properly, checks for bowstringing side to side, and sends you for ultrasound when the exam says so.
- Makes a custom thermoplastic pulley ring, molded to your finger, which sits flatter and stays put better than tape for the protection phase.
- Watches the middle joint. A sore finger held slightly bent for weeks can stiffen at the PIP joint, and that stiffness can outlast the pulley injury. See stiff fingers after an injury.
- Gives you numbers, not vibes: what to load, how long to hang, and the criteria for bringing the crimp back.
What it isn’t
Two things get confused with this.
If the fingertip won’t bend at all, that’s not a pulley. That’s the flexor tendon itself pulled off the bone, jersey finger, and it has a surgical deadline measured in weeks.
If the pain sits at the middle joint rather than the base of the finger, with swelling around the joint itself, look at PIP joint sprains instead. Also very common in climbers, and a completely different timeline. Not sure which spot is which? Finger pain by location sorts it.
Get it checked today if
- The fingertip won’t bend on its own.
- You can see the tendon lifting off the bone when you pull.
- The finger is pale, cold or numb, or looks bent out of line.
- Swelling and pain are rapidly getting worse rather than settling.
Get it checked if
- Pain at the base of the finger isn’t clearly improving by 2 weeks.
- The middle joint won’t fully straighten by 3 to 4 weeks.
- It pops again, or crimping still hurts at 6 weeks despite following the plan.
- You’re not sure of the grade and you want to train hard again.
Pole and aerial work load the same fingers and forearm, hanging instead of crimping. See pole and aerial grip pain.
It stops hurting in weeks. It finishes healing in months. Climb by the second clock.
Written by Nigel Chua, hand occupational therapist in practice since 2005. Thousands of hands, wrists and elbows assessed and treated. My credentials are here. This article explains; it doesn’t examine. Visible bowstringing or a fingertip that won’t bend needs assessing now.
Part of: Hand, wrist and elbow pain by job, sport and hobby
Every article on this site is written using the Closing Window Method: name the window your condition runs on, find where you are in it, and act while it’s still open.