Exostectomy is the surgical removal of an exostosis, a benign bony growth that protrudes from the surface of a bone. The procedure is performed across a wide range of body sites, from the heel and toes to the ear canal and fingers, whenever a bony lump causes pain, limits function, or threatens nearby structures. Because the word simply means “cutting out a bone growth,” the specifics of the surgery vary dramatically depending on where the exostosis sits and what damage it has done.
Why Bony Growths Form in the First Place
Exostoses develop for different reasons depending on the location. Some arise from repetitive mechanical stress. The bony bump on the back of the heel known as Haglund’s deformity, for instance, develops where the Achilles tendon meets the calcaneus, often aggravated by rigid-backed shoes and repetitive loading. Bony spurs on the underside of the heel grow at the attachment point of the plantar fascia, driven by chronic tension. In the ear canal, repeated exposure to cold water and wind stimulates new bone growth along the canal walls, a condition so common among ocean athletes that it earned the nickname “surfer’s ear.”
Other exostoses have a genetic origin. Osteochondromas, the most common benign bone tumors, are cartilage-capped bony projections that typically appear near growth plates during childhood and adolescence. When a person develops many of these, the condition is called hereditary multiple exostoses, caused by mutations in genes involved in cartilage and bone development.1Lippincott Open Access / Orthopedic Nursing. A Rare Case of Hereditary Multiple Exostoses in a Woman Subungual exostoses, small bony growths beneath toenails, represent yet another category. These differ from osteochondromas in that they involve an overgrowth of normal bone from the tip of the distal phalanx rather than cartilage-capped projections near a growth plate.2PubMed Central. Surgical treatment of nail bed subungual exostosis
When Surgery Becomes Necessary
Exostectomy is almost never the first treatment attempted. For heel bumps, plantar spurs, and most other symptomatic exostoses, doctors start with conservative measures: pain relief, physical therapy, changes in footwear, orthotics, or activity modification. Surgery enters the picture only after these approaches have been tried for a reasonable stretch and failed to provide relief.3PubMed Central. Surgical Treatment of Haglund’s Deformity: A Systematic Review and Meta-Analysis The same conservative-first philosophy applies to plantar calcaneal spurs, where months of stretching, cushioned insoles, and sometimes cortisone injections are standard before anyone considers operating.4PubMed Central. Comparison of Isolated Calcaneal Spur Excision and Plantar Fasciotomy in Addition to Spur Excision in Patients With Plantar Heel Pain Accompanied by Calcaneal Spur
There are situations, though, where watchful waiting is not appropriate. An osteochondroma showing signs of possible cancerous change, such as a cartilage cap thicker than about two centimeters in an adult, new or worsening pain, or sudden growth after skeletal maturity, warrants prompt excision rather than continued observation.5PubMed Central. Osteochondromas: An Updated Review of Epidemiology, Pathogenesis, Clinical Presentation, Radiological Features and Treatment Options Ear canal exostoses that narrow the canal enough to trap water and debris, leading to recurrent infections or hearing loss, also call for surgical correction without a prolonged trial of conservative care.
Haglund’s Deformity and the Back of the Heel
One of the most common sites for exostectomy is the posterosuperior corner of the calcaneus, where a prominent bump irritates the Achilles tendon and the small bursa that sits between them. The resulting combination of bony prominence, inflamed bursa, and tendon damage is Haglund’s deformity, and it is a frequent cause of posterior heel pain in active adults. Surgical treatment typically involves excising the bony bump, removing the inflamed bursa, and, when the Achilles tendon has degenerated, debriding or reattaching it.6PubMed Central. Surgical Treatment of Haglund’s Deformity: A Systematic Review and Meta-Analysis
Both open and endoscopic approaches exist. Open surgery gives the surgeon full visualization and is often chosen when the Achilles tendon needs significant repair. The trade-off is a longer recovery and a higher chance of wound complications. Minimally invasive techniques, performed through small incisions with fluoroscopic guidance, have gained traction in recent years. One study of 34 patients who underwent an isolated calcaneal exostectomy through a single small lateral portal reported substantial pain reduction and a return to sport in an average of about two and a half weeks, with no major complications and all patients satisfied at two-year follow-up.7PubMed. Minimally Invasive Surgery Technique Is Safe and Effective for the Treatment of Haglund Deformity That recovery timeline is notably faster than what most open procedures deliver, though the minimally invasive approach is not suitable for everyone, especially patients whose Achilles tendon needs formal reattachment.
A comparison of exostectomy with tendon repair against a different technique, a closing wedge calcaneal osteotomy, found that both approaches produced similar improvements in pain and function scores, though superficial wound infections were somewhat more common in the exostectomy-with-repair group.8PubMed Central. Comparison of Dorsal Closing Wedge Calcaneal Osteotomy and Exostectomy With Tendon Repair for Insertional Achilles Tendinopathy in Mild-to-Moderate Cases The fact that two fundamentally different surgical strategies achieved comparable outcomes hints at something worth knowing: for mild-to-moderate cases, the choice of technique may matter less than the decision to intervene at the right time.
Plantar Heel Spurs and the Bottom of the Foot
Bony spurs on the underside of the heel are extremely common on imaging, and most never cause symptoms. When they do contribute to stubborn heel pain that doesn’t respond to conservative treatment, excision is an option, but the evidence here is more nuanced than for Haglund’s surgery. Both isolated spur removal and spur removal combined with a partial release of the plantar fascia have been shown to improve foot function in patients with persistent pain.9PubMed Central. Comparison of Isolated Calcaneal Spur Excision and Plantar Fasciotomy in Addition to Spur Excision in Patients With Plantar Heel Pain Accompanied by Calcaneal Spur
However, a separate study found that actually excising the spur during plantar fascia surgery was associated with a delay in symptom resolution and a longer time before patients could bear weight in shoes, compared with fascia surgery alone without spur removal.10PubMed. The effect of plantar calcaneal spur excision on plantar fascia surgery outcomes Complication rates and the need for retreatment were similar between the two approaches, so the spur removal itself didn’t appear to cause harm, but it didn’t speed things up either. This finding complicates the intuition that if there’s a spur, you should obviously remove it. The spur may be more of a bystander than a culprit in many cases of plantar heel pain, and removing it adds surgical trauma to a weight-bearing surface.
A fluoroscopy-assisted approach using a single small plantar medial incision has also been described, with results showing symptom improvement in all treated patients and a faster return to normal activities compared with traditional open techniques.11PubMed. Fluoroscopy-assisted plantar fasciotomy and calcaneal exostectomy: a retrospective study and comparison of surgical techniques Even so, the question of whether to excise the spur at all during plantar fascia surgery remains genuinely unsettled, and your surgeon’s recommendation will likely hinge on the size and location of the spur and how much of the pain picture it seems to explain.
Surfer’s Ear and the Ear Canal
External auditory canal exostoses are smooth, bony lumps that grow along the walls of the ear canal in response to cold water and wind exposure. The growths develop slowly over years, and many people carry them without knowing it. Problems arise when the exostoses narrow the canal enough to trap water after swimming or surfing, leading to repeated ear infections, difficulty clearing earwax, and sometimes conductive hearing loss. Professional surfers and those who surf predominantly in colder water face much higher odds of developing these growths.12PubMed. Surfer’s ear: external auditory exostoses are more prevalent in cold water surfers
When the growths become symptomatic, surgery involves removing bone from the ear canal walls to widen the passage, a procedure sometimes called canalplasty. Two main techniques exist: a drill-based approach and an osteotome (chisel) approach. A systematic review and meta-analysis comparing the two found that both carried known complication risks, and the choice between them often comes down to surgeon preference and the anatomy of the individual ear.13PubMed. Complication Rates in Osteotome and Drill Techniques in External Auditory Canal Exostoses: A Systematic Review and Meta-Analysis The drill allows precise, controlled bone removal but generates heat and fine debris; the osteotome avoids heat but requires more force and skill in a tight space.
One frustration with ear canal exostectomy is that the growths can come back if the person continues cold-water exposure without ear protection. Long-term follow-up has shown that earplug use after surgery significantly reduces the recurrence of canal narrowing. Older patients at the time of surgery tended to develop recurrent disease faster, possibly because their cumulative cold-water exposure history makes the bone more reactive.14PubMed. Exostoses of the external auditory canal: a long-term follow-up study of surgical treatment The takeaway is straightforward: surgery can open the canal back up, but prevention and post-surgical protection are what keep it open.
Preventing Surfer’s Ear Before It Starts
Given how slowly ear canal exostoses develop and how effective prevention can be, it is surprising that more cold-water athletes do not routinely wear earplugs. A prospective study of 242 ears in surfers confirmed that wearing earplugs is effective at preventing exostosis growth, while surf hoods alone did not provide the same protection.15PubMed. Impact of ear protection on occurrence of exostosis in surfers: an observational prospective study of 242 ears Part of the problem is compliance. Earplugs muffle sound and can feel intrusive, and research acknowledges that hearing impairment while wearing them is a genuine barrier to adoption.16PubMed. Audiological implications of earplugs used for the prevention of aural exostoses Newer vented earplug designs attempt to address this by allowing some sound through while blocking water, though the trade-off between hearing clarity and water protection is never perfect.
If you surf, dive, kayak, or swim in cold water regularly, the calculus is simple: wear earplugs now, or potentially face surgery later. And if you’ve already had exostectomy of the ear canal, wearing plugs during every cold-water session is not optional advice but a practical necessity to protect the result.
Under the Toenail
Subungual exostosis is a small but troublesome problem. A firm bony growth pushes up from the tip of the toe bone, lifting, deforming, or destroying the nail. It typically shows up as a painful, hard bump under or beside the nail, sometimes accompanied by inflammation and secondary infection.17Foot & Ankle Surgery: Techniques, Reports & Cases. Subungual exostosis and chronic onychocryptosis: An intricate relationship – clinical review and management People sometimes mistake it for an ingrown toenail or a fungal infection, which can delay proper diagnosis. An X-ray usually clears things up quickly by revealing the characteristic bony projection.
The standard surgical treatment is complete marginal excision, typically through an incision designed to protect the nail matrix. A systematic review of outcomes found that complete excision through a fish-mouth incision led to a recurrence rate of about four percent and satisfactory clinical results in roughly three-quarters of patients.18PubMed Central. Subungual exostosis of the toes: a systematic review The remaining quarter weren’t necessarily failures; “satisfactory” in this context meant no need for further surgery and an acceptable cosmetic appearance, and some nails simply don’t return to their original shape after being pushed around by bone for months or years. Still, a four percent recurrence rate is reassuringly low for a procedure that can make a meaningful difference in daily comfort.
Finger Joints and Mucous Cysts
Exostectomy also has a role in the hands, though it goes by a different name. Osteophytes, the small bony spurs that form around arthritic finger joints, can give rise to mucous cysts, fluid-filled bumps that appear near the base of the fingernail. These cysts are more than a cosmetic nuisance; they can groove the nail, thin the overlying skin to the point of rupture, and occasionally introduce infection into the joint.
A common surgical approach removes the offending osteophyte from the joint without excising the cyst itself. The rationale is that the bony spur creates the mechanical irritation driving cyst formation, and once the spur is gone, the cyst should resolve on its own. Research supports this strategy: one study found that nearly all mucous cysts regressed after osteophyte excision alone, without needing the cyst to be separately removed, and without skin complications from the surgery. The trade-off was that some patients experienced postoperative pain and some loss of finger motion at the treated joint.19PubMed. Osteophyte excision without cyst excision for a mucous cyst of the finger That loss of motion is worth discussing with your surgeon beforehand, particularly if the affected joint already has limited range from arthritis.
When a “Benign” Growth Turns Out Not to Be
Most exostoses are benign, and the vast majority stay that way. Osteochondromas, the cartilage-capped bony projections that are the most common benign bone tumors, rarely undergo malignant transformation. When it does happen, the exostosis converts into a chondrosarcoma, a slow-growing cartilage cancer. The risk is higher in people with hereditary multiple exostoses than in those with a single sporadic osteochondroma.
Warning signs include a cartilage cap thicker than about two centimeters in an adult or three centimeters in a child, new pain at the site of a previously painless bump, and especially any growth of the lesion after the skeleton has finished maturing.20PubMed Central. Osteochondromas: An Updated Review of Epidemiology, Pathogenesis, Clinical Presentation, Radiological Features and Treatment Options Imaging, particularly MRI to assess cap thickness and surrounding soft tissue involvement, plays a central role in distinguishing a stable, benign osteochondroma from one that has turned. A case report illustrating this scenario described an osteochondroma of the proximal femur that transformed into a well-differentiated chondrosarcoma with soft tissue invasion, requiring wide-margin resection and reconstruction with a prosthesis.21PubMed. Malignant transformation of osteochondroma to chondrosarcoma: a challenging case That case underscores why imaging and clinical follow-up matter for anyone with known osteochondromas, even ones that have been quiet for years.
When surgical excision of an osteochondroma is performed with a clean margin, local recurrence is rare, reported at less than two percent for complete resections.22PubMed Central. Osteochondromas: An Updated Review of Epidemiology, Pathogenesis, Clinical Presentation, Radiological Features and Treatment Options This is one area where the stakes of exostectomy are higher than typical: removing a potentially transforming osteochondroma with adequate margins is not the same as shaving a heel bump, and the surgical planning and follow-up are correspondingly more involved.
What Recovery Looks Like
Recovery timelines after exostectomy vary enormously by site and by how much additional work the surgeon had to do beyond removing the bone. For a minimally invasive Haglund’s exostectomy without tendon repair, patients in one series were back to sports in about two and a half weeks on average.23PubMed. Minimally Invasive Surgery Technique Is Safe and Effective for the Treatment of Haglund Deformity When the same surgery includes Achilles tendon detachment and reattachment, however, weeks of immobilization in a boot or cast are standard, and full return to activity may take several months. Ear canal exostectomy recovery involves keeping the ear dry for a period while the canal skin heals over the reshaped bone, and patients typically avoid water exposure for four to six weeks.
Subungual exostosis removal is generally an outpatient procedure with a straightforward recovery, though the nail may take many months to grow back normally, if it does at all. For finger osteophyte excision, the joint itself may be stiff and sore for weeks after the procedure, and some permanent loss of motion is possible at an already-arthritic joint.
Across all these sites, wound infection is the most common complication, and it is more of a concern at the heel and foot, where the surgical site is under constant mechanical stress from walking and shoe wear. The exostectomy-with-tendon-repair group in one study had superficial wound infection rates around thirteen percent, compared with about seven percent in the osteotomy group, a reminder that combining soft tissue repair with bone removal at a high-stress location does carry real wound-healing consequences.24PubMed Central. Comparison of Dorsal Closing Wedge Calcaneal Osteotomy and Exostectomy With Tendon Repair for Insertional Achilles Tendinopathy in Mild-to-Moderate Cases
How Exostectomy Fits Into Bunion Surgery
You may also encounter the term “exostectomy” in the context of bunion correction. During bunion surgery, the medial eminence, the bony bump on the inner side of the big toe joint, is often shaved down. This is technically an exostectomy, and it has been a component of hallux valgus correction for over a century. Historical bunion procedures, including those developed by Hohmann, Reverdin, and Peabody in the early twentieth century, combined metatarsal osteotomies with exostectomy of the medial bump to address both the angular deformity and the prominence that rubs against shoes.25Foot and Ankle Clinics. Foot and Ankle Clinics In modern practice, shaving the bump alone without correcting the underlying angular malalignment is rarely sufficient for a true bunion, but the exostectomy component remains a standard part of most comprehensive correction procedures.
Hereditary Multiple Exostoses and Ongoing Surveillance
People with hereditary multiple exostoses face a different relationship with exostectomy than someone with a single heel spur. They may develop dozens of osteochondromas throughout childhood and adolescence, primarily near the growth plates of long bones. Many of these never need surgery, but some press on tendons, nerves, or blood vessels, limit joint motion, or cause limb-length discrepancies in growing children. The condition is caused by loss-of-function mutations in genes responsible for producing heparan sulfate, a molecule critical for normal cartilage and bone development.26Lippincott Open Access / Orthopedic Nursing. A Rare Case of Hereditary Multiple Exostoses in a Woman
Because the genetic defect is present in all bone-forming cells, new exostoses can continue to appear during growth, and surgical removal of one does not prevent others from forming. Lifelong clinical monitoring is standard for people with this diagnosis, with particular attention to any lesion that changes after skeletal maturity, since the risk of malignant transformation, while still low, is higher in this population than in those with isolated osteochondromas. Decisions about which growths to excise and when are individualized, balancing symptom relief against the cumulative burden of repeated surgeries over a lifetime.