Hand & Wrist

Foreign Bodies in the Hand

Wood and other organic material are easy to miss on a standard X-ray and carry a meaningfully higher infection risk than metal. Dr. Peter FitzGibbons evaluates and removes retained foreign bodies from the hand for patients throughout Montgomery County in Bethesda and Germantown.

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What is foreign bodies in the hand?

A retained foreign body is material such as wood, glass, or metal left in the hand's soft tissue after a puncture or crush injury. Metal and glass show up on X-ray, but wood often does not and carries a higher infection risk. Removal is recommended for most organic material, while small inert metal fragments may sometimes be left alone.

A retained foreign body is any outside material left within the soft tissue of the hand after a penetrating, blunt, or abrasive injury, most often first noticed in an emergency department or urgent care visit after a puncture, cut, or crush (PMC; StatPearls). Foreign bodies are grouped into three broad categories by what they are made of: metallic, organic, and inorganic non-metallic materials, and this composition drives both how we look for the object and how urgently it needs to come out (StatPearls).

The most frequently encountered materials in the hand are wood, metal, and glass, along with sewing needles, thorns and other plant material, plastic, fishhooks, and small stones (AAFP; HMP Global Learning Network). Splinters are typically wood, thorns, or plant spines, though they can also be plastic or glass (AAFP).

Why Composition Matters: Radiopaque vs. Radiolucent

Standard X-ray remains the first imaging test for a suspected foreign body, and it reliably picks up radiopaque materials, meaning materials that appear clearly white on the film. Metal is radiopaque, and so, notably, is glass; essentially all glass shows up on X-ray, though very small fragments under roughly 2 millimeters can still be missed (AAFP; PubMed). Even when an object does show up, plain X-ray can struggle to pinpoint its exact depth and location, which complicates planning for removal (PMC).

Wood, along with plastic and much vegetative material such as thorns and splinters, is radiolucent, meaning it typically does not show up on a standard X-ray at all. The literature reports that up to 38 percent of non-radiopaque foreign bodies are missed on the initial X-ray (PMC). This is a critical point for patients to understand: a normal X-ray does not rule out a retained wood splinter or similar organic fragment, and if your symptoms and the mechanism of injury still suggest something is present, further evaluation is warranted despite a clear X-ray.

Ultrasound has proven highly sensitive and specific for both radiopaque and, more importantly, radiolucent foreign bodies that were missed on X-ray, with the added benefit of allowing real-time, image-guided removal (PMC). In a study of 120 patients with a negative X-ray but ongoing clinical suspicion of a soft-tissue foreign body, ultrasound was positive in 114 of the 120, and the foreign body was successfully retrieved during surgery in 108 of those cases, with only 6 false positives among those who underwent surgical exploration (PMC). CT and MRI are reserved for select, difficult cases, for example when a small wood fragment is strongly suspected clinically but has not been localized by either X-ray or ultrasound (PubMed).

Why This Matters for Infection Risk

Infection is the most common complication of a retained foreign body, with reported rates across studies ranging from about 1.1 to 12 percent (HMP Global Learning Network). Organic material, wood in particular, carries the highest risk of infection and inflammatory reaction of any foreign body type, because the body's reactive inflammatory response is greatest against organic material (HMP Global Learning Network; AAFP). Metal, by contrast, is relatively inert and carries a lower infection risk; a small, deeply situated, inert metallic fragment such as a retained BB, if it is superficial and away from joints, tendons, and nerves, can sometimes reasonably be left in place, since the trauma of removing it may outweigh the risk of leaving it (AAFP). Risk factors for infection from a retained foreign body include how long it has been in place, the material itself, how contaminated the wound was, and patient factors such as older age and diabetes (HMP Global Learning Network). Delayed removal is specifically linked to a higher rate of local infection, which is the clinical argument for identifying and removing organic material promptly rather than waiting to see if symptoms resolve on their own (PMC).

Symptoms — do you recognize these?

A visible puncture, laceration, or entry wound, sometimes with a fragment protruding
Pain at the site, which may worsen rather than improve over the days following injury
A persistent sensation that something remains lodged beneath the skin
Redness, warmth, swelling, or drainage suggesting an early infection
Reduced motion or pain with movement of a nearby joint or tendon
Symptoms that reappear weeks or months after a seemingly healed, sometimes forgotten, injury, which can indicate migration of the object

Ongoing pain, redness, drainage, or a sensation of something still inside the hand after any puncture or crush injury should be evaluated rather than watched. This is especially true for wood or plant-material injuries, given their meaningfully higher infection risk compared with metal or glass.

How we diagnose it

History and physical examination focus on the mechanism of injury, the likely material involved, and how much time has passed since the injury. We examine the wound for tenderness, drainage, and reduced motion of nearby structures, and assess distal sensation and circulation.

Plain radiography is the first imaging test obtained. As described above, it reliably identifies metal and glass but frequently misses wood and other organic material.

Ultrasound is used when the X-ray is negative but suspicion remains, particularly for a suspected wood or plant-material fragment, since it detects radiolucent material that X-ray cannot and can guide removal in real time (PMC).

CT or MRI are reserved for cases where a fragment, most often wood, is still strongly suspected but has not been localized despite X-ray and ultrasound (PubMed).

Treatment options

The decision to remove a foreign body, and how urgently, depends on the material, its location relative to joints, tendons, and nerves, and whether there are signs of infection or ongoing symptoms.

Observation

Small, inert fragments, most often metal, that are not causing pain, are away from joints, tendons, and nerves, and are not associated with infection, can reasonably be left in place and monitored rather than surgically pursued.

When used: Deep, small, inert metallic fragments in a clean wound with no infection and no patient awareness or bother, where removal is likely to cause more tissue disruption than leaving the object alone (StatPearls; AAFP).

Bedside or office exploration and removal

For a superficial, easily localized object, local anesthesia is used to numb the area and the fragment is removed directly through the existing wound or a small incision.

When used: Superficial foreign bodies that are readily palpable or visible, particularly organic material near the surface, where a defined time limit for the attempt is set and a plan is made for imaging-guided removal if the object cannot be found quickly.

Recovery & rehabilitation

Recovery after removal of a straightforward, superficial foreign body is typically brief: most patients return to normal hand use within a few days to two weeks, once the wound has closed and any associated soreness has resolved. Recovery after formal surgical exploration for a deeper or infected foreign body is longer and depends on what structures were involved. If a tendon sheath infection or abscess had developed, recovery includes a course of antibiotics and, often, a period of splinting and hand therapy to restore motion once the infection has cleared.

Patients throughout Bethesda, Germantown, and the rest of Montgomery County who need hand therapy after a more involved foreign body removal are seen at our physical therapy location in Rockville. We ask patients to watch for recurrent redness, swelling, or drainage in the weeks after removal, since a fragment of organic material can occasionally be left behind even after what seemed like complete removal, given how difficult small pieces of wood or plant material can be to fully visualize even with imaging assistance.

Frequently Asked Questions

If my X-ray was normal, does that mean there's nothing left in my hand?

Not necessarily, and this is one of the most common misunderstandings about foreign bodies in the hand. Standard X-ray reliably shows metal and glass, but wood, plastic, and plant material such as thorns are often invisible on X-ray. Studies report that up to 38 percent of these radiolucent materials are missed on the initial film. If your symptoms and the way you were injured still suggest something may be retained despite a clear X-ray, an ultrasound is the appropriate next step, since it detects these materials far more reliably than X-ray does.

Why does a wood splinter need more urgent attention than a piece of metal?

Organic material, wood especially, triggers a stronger inflammatory reaction in the body than metal does, and it carries the highest infection risk of any commonly retained foreign body material. Metal, in contrast, is relatively inert, and a small, harmless-seeming metal fragment can sometimes be safely left in place if it is not causing symptoms and is away from important structures. Because of this difference, we generally recommend removing wood and other organic material fairly promptly, while taking a more selective approach with small, deep, asymptomatic metal fragments.

Do I always need surgery to remove a foreign body from my hand?

No. Many foreign bodies, particularly superficial ones, can be removed in an office or emergency setting under local numbing medicine, without a trip to the operating room. Formal surgical exploration is reserved for objects that are deep, close to a nerve, tendon, or joint, associated with infection, or that were not successfully retrieved during an initial bedside attempt. The decision is based on the object's depth, location, and any signs of infection, not simply on whether something needs to come out at all.

What happens if a foreign body is left in my hand for a long time?

It depends on the material and location, but leaving organic material in place for an extended period raises the risk of ongoing infection, an inflammatory nodule called a granuloma, and, rarely, chronic bone infection. Foreign bodies located near tendons can also migrate over time and cause symptoms that appear well after the original, sometimes forgotten, injury. Because of this, we recommend evaluation for any retained foreign body that has not resolved on its own, particularly when the material is unknown or suspected to be wood or another organic substance.

Can removing a foreign body cause more harm than leaving it alone?

Yes, in specific circumstances, which is why removal is not automatic for every retained object. A prolonged, poorly localized search for a small, deep fragment can require a larger incision and risks injuring nearby nerves or blood vessels, sometimes causing more harm than the foreign body itself would have. This is part of why we favor image-guided removal, using ultrasound to pinpoint the object precisely, over a blind surgical search, and why small, deep, inert metal fragments away from critical structures are sometimes reasonably observed rather than pursued.

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Peter G. Fitzgibbons, MD

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Medically reviewed by Peter G. Fitzgibbons, MD, MD

Last reviewed August 5, 2026