What Is an Avulsion Fracture? Symptoms, Causes, and Treatment
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer: What is an avulsion fracture and is it serious?
An avulsion fracture is a break in which a small piece of bone attached to a tendon or ligament is pulled away from the main bone, typically during sudden direction changes in contact sports. [1] It is serious and should be evaluated in an emergency department. [1] Healing takes three to 12 weeks, and surgery is reserved for severe cases. [1]
Key takeaways
An avulsion fracture is when a tendon or ligament pulls a small piece of bone away from the main bone. [1]
It usually happens during sudden changes in direction, sprinting, kicking, or leaping, and most often affects young athletes. [1]
The bones most at risk include the elbow, ankle, foot, knee, finger, wrist, pelvis, hip, and spine. [1]
Symptoms start with sudden, severe pain, then bruising, swelling, muscle pain, a popping sound, and difficulty moving the limb. [1]
Most avulsion fractures heal without surgery in about 3 to 12 weeks using a cast or splint, rest, medication, icing, and physical therapy. [1]
Surgery is occasionally needed when the bone fragment is more than 2 centimeters from the main bone or there is joint instability. [1]
Returning to sports too soon risks reinjury, so always confirm clearance with your healthcare provider. [1]
What the research says
Most adolescent pelvic avulsion fractures heal well without surgery. A systematic review and meta-analysis of 24 studies covering 852 fractures in 849 patients (mean age 14.4 years) found that 86.6% were managed nonoperatively and that return to sport was achieved in nearly all cases. The authors noted that current evidence does not establish a validated displacement threshold at which outcomes clearly diverge (Molina et al., J Pediatr Orthop, 2026) [2].
Surgery and conservative care each carry trade-offs. A review of pelvic avulsion fractures reported a higher risk of heterotopic ossification (extra bone forming in soft tissue) after surgery (9%) than after conservative treatment (1.8%), but a lower risk of non-union (0% versus 2.5%). Surgery was favored for large displacement and conservative care for minimally displaced fractures (Calderazzi et al., Acta Biomed, 2018) [3].
For children's ankle injuries, a boot may beat a cast. In a randomized trial of 60 children with low-energy lateral ankle injuries, a group that included distal fibula avulsion fractures, a controlled ankle motion (CAM) boot caused fewer complications than a short leg walking cast at 4 weeks (0.04 versus 0.54 per patient). At 8 weeks, none of the CAM patients had continued symptoms versus 15.4% of cast patients (Beck et al., J Pediatr Orthop, 2023) [4].
What Is an Avulsion Fracture?
An avulsion fracture is when a small piece of bone attached to a tendon or ligament gets pulled away from the main part of the bone. [1]
To understand how this happens, it helps to know what tendons and ligaments do. Ligaments hold your bones, joints, and organs in place, while tendons connect muscles and bones. [1] In an avulsion fracture, your bone moves one way and your tendon or ligament moves in the opposite direction, with a broken chunk of bone in tow. This most often happens when you suddenly change direction. [1]
Because any bone connected to a tendon or ligament can be involved, avulsion fractures can occur in many places throughout the body. [1] For a broader look at how a broken bone forms and heals, see our bone fracture guide.
Which Bones Are Most at Risk?
At-risk area | Why it is vulnerable |
Elbow bones | Connected to powerful tendons and ligaments |
Ankle and foot bones | Absorb force during sprinting, leaping, and landing |
Knee bones | Stress during sudden stops and direction changes |
Finger and wrist bones | Commonly injured by falling on an outstretched hand |
Pelvis and hip bones | Forceful kicking and sprinting muscles attach here |
Spine bones | Connected to strong supporting ligaments |
Is an Avulsion Fracture Serious?
Yes. Any fracture is serious, including avulsion fractures. [1] If you think you have broken a bone, go to the emergency department. [1]
Professional medical treatment ensures you heal safely and return to your regular routine. Trying to ignore the injury or "play through it" can make the fracture worse and delay recovery.
Who Gets Avulsion Fractures?
Avulsion fractures usually happen to young athletes. [1] People who frequently incur them are athletes and performers whose activities involve sudden changes in direction, leaping, and kicking, including football players, ballet dancers, gymnasts, and skiers. [1]
However, avulsion fractures can occur in anyone, often through injuries similar to sprains, such as a twisted ankle. [1]
The injury is painful, and being unable to play a favorite sport or do a treasured activity can be painful in its own way. If you are having issues with your mental or emotional health during recovery, let your healthcare provider know. [1] Treatment can help you get through this difficult time.
What Causes Avulsion Fractures?
Playing sports comes with risks. Contact sports like lacrosse, boxing, and football are the most common causes of avulsion fractures because they involve movements that stress your limbs. [1]
High-risk movement | Example |
Suddenly changing direction | Cutting sideways during a sprint |
Sprinting | Explosive acceleration |
Kicking | A soccer kick or martial arts strike |
Leaping | Jumping and landing in gymnastics or basketball |
Falling on an outstretched hand | Landing from a fall in football or skating |
Sudden acceleration or deceleration | Getting faster or slowing down quickly |
Hitting | A boxer or football lineman making contact |
Sliding | A baseball or softball player sliding into home base |
What Are the Symptoms of Avulsion Fractures?
After sudden, severe pain, the most common symptoms of avulsion fractures include:
Symptom | How it shows up |
Sudden, severe pain | Intense pain at the moment of injury |
Bruising | Discoloration around the injury site |
Swelling | Puffiness near the affected bone |
Muscle pain | Soreness in the muscles around the break |
Popping or cracking sound | An audible sound at the time of injury |
Spreading pain | Pain that radiates to nearby parts of the body |
Limping or inability to walk | If the broken bone is in or near the leg |
Difficulty moving your limb | Reduced range of movement |
Speak with your healthcare provider about all of your symptoms. Sharing every detail helps them figure out the best treatment plan for you.
How Are Avulsion Fractures Diagnosed?
Healthcare providers at the emergency department will discuss your injury with you, ask questions, perform tests, look over the affected area, and check whether you can move your bones. After that, imaging tests provide a closer look. [1]
Test | Purpose |
X-rays | Look at your bones and joints |
CT scan | Examine soft tissues and organs and get a more precise view of bones and joints; performed if X-rays are unclear |
Providers typically ask several questions to understand the injury fully:
Question | Why it matters |
When were you injured? | Establishes the injury timeline |
How did you get injured? | Reveals the mechanism and likely structures involved |
What are your symptoms? | Guides the examination |
Did you hear something break? | Helps distinguish a fracture from a sprain |
What medications do you take? | Affects treatment and medication choices |
Tell your healthcare provider every detail. It helps with both the diagnosis and the treatment.
How Are Avulsion Fractures Treated?
Treatment depends on which bone broke and the type of avulsion fracture. [1] Generally, treatment includes:
Treatment step | Purpose |
Immobilization in a cast or splint | Aligns and protects the bone while it heals |
Anti-inflammatory medications | Reduces pain and swelling |
Restriction of activity | Prevents reinjury during healing |
Icing the area | Calms swelling in the early days |
Physical therapy with exercises | Restores strength and movement |
After the pain subsides, providers might recommend range-of-motion (ROM) exercises monitored by a physical therapist. [1] Surgery is occasionally required for severe injuries with joint instability. [1]
How Do Bones Heal?
The stiff tissues that make up your bones begin to heal right after they break [1], which is why immediately aligning and protecting them (that is what a cast does) matters so much. An avulsion fracture heals in two main steps:
Healing step | What happens |
Step 1: Blood clot and callus | The body creates a blood clot (a clump of blood more like a gel than a liquid) around the fracture. Firm collagen makes up a callus. The clot forms first, and then the callus replaces it, protecting the broken bones. |
Step 2: Bone cell "threads" | Bone cells grow out of the broken-off bone and from the main bone. They form threads that grow outward and toward each other like reaching hands. The threads absorb the callus, and the chunk of bone that separated gets reattached to its place. |
Who Needs Surgery for an Avulsion Fracture?
Most avulsion fractures do not require surgery. However, if the bone attached to the tendon or ligament is pulled far from the main bone (often more than 2 centimeters), a surgeon may recommend one of two procedures: [1]
Procedure | What happens |
Open reduction | The surgeon makes an incision and realigns your bones |
Internal fixation | The surgeon uses metal hardware (pins, plates, screws, and rods) to align your bones permanently |
If surgery is needed, you may be asleep during the procedure. An anesthesiologist provides the most appropriate method, such as general anesthesia or regional anesthesia like an epidural. Either way, you will not feel anything. [1]
How Long Does It Take to Recover?
You might need to wear a cast or splint for a few weeks. Fractures usually take about three to 12 weeks to heal completely. [1]
For an avulsion fracture in the pelvis or anywhere else where a cast cannot be applied, a short period of rest followed by crutches is helpful. [1] Your provider might allow you to apply weight after a few weeks and resume sports activities as tolerable. [1]
Confirm with your healthcare provider about when you can return to sports. You could reinjure yourself if you go back too soon. [1]
Do I Need to Follow Up With a Specialist?
You may see an orthopaedist after treatment at the emergency department. Orthopaedists specialize in your skeletal and muscular system. Depending on your injury, you might need to attend appointments as often as twice a week while your orthopaedist monitors your healing and orders more X-rays as needed. [1]
Can Avulsion Fractures Get Worse or Come Back?
Your avulsion fracture can get worse if you do not follow your healthcare provider's advice. Be very careful not to put weight on the fracture until your provider says it is OK, because putting weight on it too early can cause reinjury. [1]
You could also get another avulsion fracture in the same place. [1] Taking preventative steps reduces your risk.
How Can I Reduce My Risk?
It is difficult to prevent an avulsion fracture entirely, but athletes can reduce their risk with a few helpful steps:
Risk-reduction step | How it helps |
Warm up before activity | Five to 10 minutes of stretching and warming up before practice or a game prepares muscles, tendons, and ligaments |
Know your limits | Not pushing yourself to do something that might be too difficult helps you avoid all types of injuries |
When Should I See a Healthcare Provider?
Go to the emergency department if you think you have a fracture. An avulsion fracture needs prompt medical care. [1]
Useful questions to ask your provider include: Do I need to see a physical therapist? Do I need another type of specialist? How long should I rest? How long do I have to wear a cast? When can I start using crutches? When can I play sports, ski, or perform again?
Conclusion
An avulsion fracture happens when a tendon or ligament pulls a small piece of bone away from the main bone, most often during the sudden direction changes, sprints, kicks, and leaps of contact sports and performing arts. [1] While the injury usually strikes young athletes, it can happen to anyone through sprain-like movements. [1]
Symptoms begin with sudden, severe pain and can include bruising, swelling, a popping sound, and difficulty moving the limb. [1] Because any fracture is serious, seek emergency care promptly. [1] Most avulsion fractures heal in three to 12 weeks without surgery, using a cast or splint, rest, anti-inflammatory medication, icing, and physical therapy [1], and following your provider's advice closely is the best protection against reinjury. If you or a loved one may have this injury, go to the emergency department.
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Frequently Asked Questions
What is an avulsion fracture in simple terms?
An avulsion fracture is when a tendon or ligament pulls a small chunk of bone away from the main part of the bone. The bone moves one way and the tendon or ligament moves in the opposite direction, taking the broken fragment with it. [1]
How does an avulsion fracture differ from a regular bone break?
A regular fracture breaks the bone itself, often from direct force. [5] An avulsion fracture happens when the tendon or ligament (the tissues that anchor bones and muscles) suddenly yanks so hard that a piece of the bone tears off with it. [1] [5]
Who typically gets avulsion fractures?
Avulsion fractures usually happen to young athletes and performers, such as football players, lacrosse players, boxers, ballet dancers, gymnasts, and skiers, whose activities involve sudden changes in direction, leaping, kicking, and sprinting. [1] But anyone can get one, including people with sprain-like injuries such as a twisted ankle. [1]
Which bones are most at risk?
The elbow, ankle, foot, knee, finger, wrist, pelvis, hip, and spine bones are most at risk because they connect to tendons and ligaments that can pull hard on the bone during sudden changes of direction. [1]
What does an avulsion fracture feel like?
An avulsion fracture typically starts with sudden, severe pain, followed by bruising, swelling, muscle pain, and sometimes a popping or cracking sound. Pain may spread to nearby areas, and if the break is in or near the leg, you may limp or be unable to walk. [1]
Do all avulsion fractures need surgery?
No. Most do not require surgery. Surgery is occasionally needed for severe injuries with joint instability or when the bone fragment is more than 2 centimeters away from the main bone. [1]
How long does an avulsion fracture take to heal?
Fractures usually take about three to 12 weeks to heal completely. You may wear a cast or splint for a few weeks, and recovery for areas that cannot be cast, such as the pelvis, involves a short rest followed by crutches. [1]
How do avulsion fractures heal?
First, the body forms a blood clot and then a firm collagen callus around the fracture to protect the broken bones. Then bone cells grow "threads" from both the fragment and the main bone toward each other; these threads absorb the callus and reattach the broken chunk to its original place. [1]
Can I return to sports while healing?
Not without your provider's approval. Returning to sports too soon risks reinjury. [1] Your provider will guide when you can apply weight, start crutches, and resume sports activities as tolerable. [1]
Can an avulsion fracture get worse?
Yes. It can worsen if you do not follow your provider's advice. Never put weight on the fracture until your provider says it is OK. You can also get another avulsion fracture in the same place, so preventative steps matter. [1]
How can athletes reduce their risk?
Athletes can warm up and stretch for five to 10 minutes before practice or games, and avoid pushing themselves to do things that may be too difficult. [1] Carefulness helps prevent all types of injuries. [1]
Is an avulsion fracture a medical emergency?
Yes. Any fracture, including an avulsion fracture, is a serious medical issue that needs professional care. Go to the emergency department if you think you have broken a bone. [1]
Related Reading
References
Cleveland Clinic. Avulsion Fracture. Cleveland Clinic Health Library. Last updated September 15, 2021. Accessed October 15, 2026. https://my.clevelandclinic.org/health/diseases/21802-avulsion-fracture
Molina LL, Block AM, Carsen S, et al. Outcomes of conservative versus surgical treatment of adolescent pelvic and hip avulsion fractures: a systematic review and meta-analysis. J Pediatr Orthop. Published online May 6, 2026. PMID: 42084198. https://doi.org/10.1097/BPO.0000000000003305
Calderazzi F, Nosenzo A, Galavotti C, et al. Apophyseal avulsion fractures of the pelvis. A review. Acta Biomed. 2018;89(4):470-476. PMID: 30657114. https://doi.org/10.23750/abm.v89i4.7632
Beck JJ, Kang V, Bennett A, et al. Controlled ankle movement (CAM) boot provides improved outcomes with lower complications than short leg walking cast in low-energy pediatric lateral ankle injuries: a prospective, randomized study. J Pediatr Orthop. 2023;43(7):418-423. PMID: 37130811. https://doi.org/10.1097/BPO.0000000000002425
Campagne D. Overview of Fractures. Merck Manual Consumer Version. Full review March 2025; last updated September 2026. Accessed November 5, 2026. https://www.merckmanuals.com/home/injuries-and-poisoning/fractures/overview-of-fractures
Medical disclaimer
The information provided in this article is for educational purposes only and is not intended as medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. If you think you have broken a bone, go to the emergency department right away.
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