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Tendon Injuries of the Hand

Make sure you know how to properly treat a hand tendon injury.

Make sure you know how to properly treat a hand tendon injury.

How Can I Tell If I've Cut a Tendon?

When resting the hand palm-side up on a table, the fingers naturally curl and point toward your torso. If a tendon is completely severed, the finger enervated by that tendon will lie flat in contrast to other fingers, as seen in the picture below.

A tendon can also be partially cut. Partially cut tendons will most likely be asymptomatic—i.e. the fingers may look as though they are not injured—when, in reality, they are. Left untreated, a partially lacerated tendon can lead to a tendon rupture down the road. This is why treatment should be sought immediately after acquiring an acute injury.

A finger with a tendon injury lying flat while other fingers retain their natural cascade.

A finger with a tendon injury lying flat while other fingers retain their natural cascade.

Tendons Can't Heal Themselves

Though ligaments can sometimes heal on their own and bones are capable of healing without surgical intervention (so long as they are not displaced fractures), tendons cannot. A severed rope has about an equal chance of rejoining its ends when held together as a severed tendon does.

For a severed tendon to heal, it is necessary to surgically intervene soon after the injury is acquired and suture the proximal and distal ends of the tendon.This is because the forearm muscles that control the tendons of the hand will cause a severed tendon to retract internally from the site of the original wound. This doesn't necessarily happen upon injury unless the hand is configured in such a way as to cause this "snap back" effect, or unless the fingers are flexed when the injury occurs.

If left untreated, the tendon usually begins to contract back into the forearm over the course of 3 to 5 days. I've assisted some cases in which we were able to find the tendon up to 7 days after the initial injury; however, waiting too long is likely to result in a tendon graft because a primary repair is no longer possible.

Anatomy of the hand.

Anatomy of the hand.

Find a Hand Surgeon

There are surgeons whose specialty involves repairing hand wounds and injuries. My advice is to seek a hand surgeon. Some orthopedic surgeons may perform hand and finger tendon repairs, but their specialty might be bones and not tendons.

Hand surgeons deal with tendons every day and should be considered the experts in the field. Having said that, there may be orthopedic surgeons or even some neurosurgeons who are capable of repairing tendon injuries of the hand.

Tendons being reattached with surgical sutures.

Tendons being reattached with surgical sutures.

Possible Complications

Complications of hand tendon surgery include postoperative rupture of the repair. This is why instructions from your surgeon and occupational or physical therapist must be followed to the letter.

Do Not Let the Injury Become Worse

Sometimes our feelings outrun pragmatism and safety, and patients begin doing more than they've been advised to do after they start to feel better. Once a tendon is re-injured, or once the surgical repair is disrupted, it is not reasonable to expect an optimal outcome in follow-up surgeries. The body is not like wood or stone on which the mason or carpenter can make several errors and still find success; those workers can just start over with new materials. Surgeons do not have that luxury—and neither do you as the patient.

A dear friend of mine once had retinae surgery. She began noticing visual improvement immediately after the operation, to the point that she stopped following the surgeon's instructions. Her lack of adherence to the instructions caused her retinae to detach again, and she is now 80% blind in that eye. How she wishes she had listened to her doctor's instructions! Learn from her example. Follow your surgeon's instructions with great care and rigidity. You'll never regret that you did, but you may regret that you didn't.

Additional Procedure in Case of Tendon Adhesion

Another complication that may occur is tendon adhesion. In the event that the repaired tendon fails to "glide" and allow the finger to flex, a procedure referred to as lysis of adhesions may be necessary. In this procedure, a small incision is made through the original incision line, and small elevating instruments called tenolysis knives are inserted and used to gently separate binding adhesions from the tendon repair.

"After surgery, the wrist is splinted in flexion for approximately 4 weeks. Supervised rehabilitation should begin immediately after surgery. Gentle passive motion can be started early. Careful supervision is necessary during the postoperative period because rupture of repaired tendons is like[ly] to produce a suboptimal result even if recognized and repaired."

— Surgery: Scientific Principles and Practice

Common Causes of Tendon Injuries of the Hand

  • Box Cutter injuries occur when using X-Acto/utility knives to cut through cardboard boxes or carpet.
  • Bagel Cutter injuries occur when using a sharp paring knife to cut through a bagel.
  • Saw Blade injuries are particularly troublesome because they tend to not just sever the tendon, but actually remove a chunk of the tendon the size of the width of the saw blade, or the "kerf." Table saws are notorious culprits when it comes to tendon injuries of the hand, so you should be especially careful when operating one.

Tendon injuries tend to be stab-type injuries, which is why the bagel cutter injury is so prevalent. Slash-type injuries can also cut tendons, but are not as common. In my experience, these have been the most common causes of injury, but, as I am sure you can imagine, there are other ways to cut a tendon.

This content is accurate and true to the best of the author’s knowledge and does not substitute for diagnosis, prognosis, treatment, prescription, and/or dietary advice from a licensed health professional. Drugs, supplements, and natural remedies may have dangerous side effects. If pregnant or nursing, consult with a qualified provider on an individual basis. Seek immediate help if you are experiencing a medical emergency.


Leland Johnson (author) from Midland MI on August 27, 2018:

Hi Vannessa,

Can you tell me how you hurt it? Twisting? Falling? What happened exactly? You may want to consider seeing a hand surgeon and getting an xray.

Vannesa on August 26, 2018:

I hurt my right thumb at work its been three weeks andi can not open bottles if i use that hand after an few minutes it still hurts the doctor said its an sprain what i dont understand is why i cant use it like before and it still bruiesed

Leland Johnson (author) from Midland MI on June 04, 2018:

Hi Flourish- You should've seen the pics I had before HP got after me! I thought I was in big trouble, but I deleted the photos and replaced them with diagrams- a little more viewer friendly. I should've known the previous pics were too graphic, but I guess I'm desensitized after being in surgery for so many years. I do have a funny story I'm thinking of adding to this hub. About 15 years ago, when I was working with the hand surgeon, I was home trying to pry apart a package of frozen sausage links and stabbed myself in my left ring finger. I had to show the surgeon (my boss) what I did- I was so embarrassed! He took one look at my hand and exclaimed, "You fool! What have you done!" He repaired the wound. I still have the scar. I thought it might add a little levity to take a pic of it and include it in the article. What do you think?

FlourishAnyway from USA on June 04, 2018:

I am so weak looking at these photos and reading this. Too much empathy? I don't know. At first, I thought, "Uh, oh. Leland has done something terrible to his hand." Then I spotted your great qualifications.

What's your opinion on bagel cutters, in which you insert the bagel into a guillotine-like device and never expose your hands to a sharp knife?