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Finger Flexor Tendon Pulley Injuries


The flexor tendons (flexor digitorum superficialis and flexor digitorum profundus) that run along the front of each finger are encased in a continuous sheath of connective tissue.  Along this sheath, there are five thickened areas that create annular pulleys (A1, A2, A3, A4, and A5) as well as three to four cruciform pulleys.  These pulleys keep the tendon close to the bone when flexing the fingers and provide stability as well as allow forces to be transferred from the muscles in the forearm to their tendons in the fingers.1-5

finger and wrist flexors
finger flexor pulley system
finger flexor pulley system

The crimp grip increases the risk of pulley injury because of the increased forces that are able to be exerted.  The force is especially high on the pulleys, especially the A2 pulley.  A closed crimp grip (using the thumb) exerts even more force, which is why it is used so often especially with smaller holds.1,6,7

open crimp grip
closed crimp grip – thumb is added


Damage to the flexor tendon pulleys is the most common climbing injury.8-14  The grading scale regarding the severity of flexor tendon pulley injuries is as follows:  1. Pulley strain 2. Complete A4 or partial A2, A3 tear/rupture 3. Complete A2 or A3 tear/rupture 4. Multiple ruptures or a single rupture with lumbricalis muscle or collateral ligament trauma.  A grade 4 injury requires surgery to prevent long term damage, such as a flexion contracture (the inability to fully straighten the finger).15,16

Often a “pop” is heard followed by significant swelling and pain (at the base of the finger for A2) when trying to extend (straighten) the finger.8,11,13,17-19  Pain is also noted when trying to flex (bend) the finger and bowstringing may be able to be detected by resisting finger flexion at the distal phalanx (fingertip) if A2-A4 are ruptured.1,13

torn pulleys with bowstringing tendons in a crimp grip


  1. Static Stretching – Holding a stretch for at least 30 seconds after a climbing session and on rest days helps to decrease injuries. (For references and more information, see my article titled “Static Stretching for Rock Climbing”.)
wrist flexor stretch
wrist/finger flexor stretch
  1. Warm up – This is a combination of an aerobic warm up (hiking, jogging, cycling, etc.), dynamic stretching, and the sport specific warm up of easy climbing for 100-120 moves (8-12 boulder problems or 3-4 routes).17,20,21 (For more information, see my article titled “Rock Climbing Warm Up”.)
  2. Taping (H taping video demo) – This way of taping has been shown to decrease the risk of reinjury when a pulley tear or sprain has occurred previously.10 
1. Tear a 4-inch piece of athletic tape from the full width of the roll. 2. Tear from each end to leave a 1/2″ bridge connecting the two ends.
3. Place the middle section along the palmer side of the joint in the middle of the finger. 4. Wrap the section of the finger closer to the hand first.
5. Bend the taped joint to 30 degrees and wrap the other section of the finger.
Ready to rock.
  1. Climbing technique and body awareness – Proper footwork technique and avoiding intense dynamic movements may help to decrease the risk of pulley injuries by reducing excessive grip force and thus placing less stress on these structures.22 Listening to your body and allowing an injury to fully heal before returning to climbing helps to prevent reinjury.


Having the grade of tear diagnosed medically helps to determine the treatment as well as to rule out damage to nearby structures.  Grades 1 to 3 pulley ruptures do not typically require surgery.  Surgical repair is recommended for Grade 4 ruptures due to the increased risk of fixed flexion contractures (an inability to fully straighten the finger).1,6,8,11,12,23,24  Some authors have also recommended surgical repair for grades 2 and 3 especially for elite-level climbers.25

Initially, one to two weeks of immobilization with a finger immobilization splint or a “pulley protection splint” is recommended for grades 2 and 3 pulley injuries (no immobilization is required for grade 1).4  After the immobilization period, H taping (see picture in prevention section above) is recommended to protect the pulley while gentle range of motion exercises are begun.

finger flexion – bend the finger until a stretch is felt, hold for a second or two, and repeat 10 times
finger extension – straighten the finger until a stretch is felt, hold for a second or two, and repeat 10 times

The taping is recommended for three months with grades 1 and 2 injuries and six months for grade 3 injuries.  Once full and pain free range of motion of the finger has returned (usually one to two weeks after beginning these exercises), gentle strengthening can be initiated with a hangboard or other strengthening device that allows for controlled movements and the ability to modify the force on the injury site if pain is noted (use the feet to decrease the force on the fingers when using a hangboard).   A crimp grip should be avoided for at least six weeks after the injury.  Movements or exercises causing pain at the site of injury should be avoided as this is the body’s way of indicating that it is being re-injured.  A gradual return to climbing can be initiated when no pain is noted with any of the gripping positions you plan to use.  These can be tested on the hangboard or chosen device.  Full return to activity is realistic in six weeks for grade 1 and 2 injuries.  For grade 3 pulley injuries, a gradual return to climbing may be able to be initiated at six to eight weeks and full functional return by three to four months minimum.6,8,11-13,18,26

Some additional treatments are:

  1. Checking for trigger points in the wrist/finger flexors as well as gentle massage to the flexor tendons and pulleys to prevent scar tissue formation
Flexor digitorum superficialis/profundus trigger points 1 – apply direct pressure to any tight or tender spots close to the X and hold for 2-3+ minutes
Flexor digitorum superficialis/profundus trigger points 2 – apply direct pressure to any tight or tender spots close to the X and hold for 2-3+ minutes
  1. Ester Smith, DPT at goes over a solid treatment protocol for this injury on her blog (also featured in This is a great research option for a grad school thesis in areas with high populations of climbers – hint, hint to the students out there.

Check out Beyond Tape: The Guide to Climbing Injury Prevention and Treatment for more information about warming up, stretching, and other climbing injury related topics.  Subscribe here to get the latest posts and like my facebook page for updates and more information.  My primary motivations for Beyond Tape and any of the posts are to:       1. Check out the most relevant and up-to-date research for each topic in order to dispel myths, sift out conflicting views, and help people to prevent or heal from injuries – letting me know about new research or opposing views is helpful and greatly appreciated       2. Contribute to the local and global communities by donating 100% of my net profits from Beyond Tape to service-based non-profit organizations, such as Rotary International, Doctor’s Without Borders, Access Fund, etc.

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