An enchondroma is a benign cartilage growth inside a bone, and in the hand it is by far the commonest bone tumor there is.
Most people never know they have one.
It gets discovered in one of two ways: as a surprise on an X-ray taken for something else… or because a finger snapped doing something trivial, and the break went straight through a hollow nobody knew was there.
The pathological fracture
This is how most enchondromas announce themselves.
A finger breaks from a knock that shouldn’t break a finger. Catching a ball awkwardly. Jamming it in a door. Pushing off a sofa.
The enchondroma has quietly thinned the bone from the inside, so the shell left around it is thin enough to fail under ordinary load.
A finger that breaks from a minor knock deserves a look at WHY also, not just a splint-and-go-home.
The good news is that the fracture itself heals like any other broken finger.
Same 4 to 6 weeks, same rules about rotation mattering more than the X-ray. The enchondroma is dealt with afterwards, once the bone has knitted, if it needs dealing with at all.
Where it sits and what it looks like
Proximal phalanx most often, then metacarpal, then middle phalanx. Little and ring fingers are common.
On X-ray it’s a well-defined hollow area with sharp borders, sometimes with specks of calcification in it, and often a thinned but intact outer shell. A radiologist usually recognizes it immediately.
You may or may not feel anything. A large one can make the finger look slightly swollen or thickened, and occasionally people notice a bump on the side of the bone.
When I see one on a report, my first question to the patient is always whether the finger has ever hurt at rest. That answer directs everything else.
What gets done about it
- Nothing, with a review X-ray — the commonest plan for a small, asymptomatic one found by chance. Watch it, don’t cut it.
- Curettage and bone graft — scraping out the cartilage and filling the cavity with graft or substitute. Done when it’s big, painful, expanding, or has already caused a fracture.
- Fracture first, tumor second — where a break has happened, most surgeons let the fracture heal and then treat the lesion in a planned operation, rather than doing everything at once in a swollen finger.
Recovery after curettage runs roughly: protected 2 to 4 weeks, moving early to avoid stiffness, grafted bone consolidating over 3 to 6 months, full strength somewhere past that.
The uncommon but important bit
A single enchondroma in a finger is benign, and malignant change in a solitary hand enchondroma is rare.
Two situations change that calculation:
Multiple enchondromas. Ollier disease and Maffucci syndrome both involve many lesions, and both carry a genuinely raised lifetime risk of malignant transformation. These need specialist follow-up, not reassurance from a website.
A lesion that changes. Pain at rest, night pain, or a lesion that has visibly grown or broken through the shell between X-rays needs urgent specialist review. A benign enchondroma is a quiet thing. Noise is the warning.
Get it looked at if
- A finger broke from a knock that shouldn’t have broken it
- There’s a deep ache in one bone that isn’t related to use
- Pain wakes you at night
- You’ve been told you have more than one of these
- A known enchondroma has changed appearance on follow-up imaging
Most enchondromas need a watchful eye and nothing else. The ones that matter announce themselves by changing.
If one has turned up incidentally on your X-ray, ask whether a follow-up film is planned and when. That single question is the whole management plan for the majority of people who have one.
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.