Nail Bed Injuries: Why Proper Repair Matters for Your Fingernail

You slammed your finger in a door, hit it with a hammer, or caught it in a piece of equipment. Your nail is bleeding, lifted, or cracked, and the fingertip is throbbing. Nail bed injuries are one of the most common fingertip injuries, and how they’re treated in the first few days makes a significant difference in whether the nail grows back normally.

Anatomy of the Nail Bed

The nail bed is the tissue beneath the fingernail. It consists of two parts: the germinal matrix (at the base, under the cuticle), which produces the nail, and the sterile matrix (under the visible nail), which helps the nail adhere to the finger. Damage to either part can result in a deformed, split, or absent nail.

Types of Nail Bed Injuries

Subungual Hematoma

Blood collects under the nail, causing intense throbbing pressure. If the hematoma involves more than 50% of the nail, it may indicate an underlying nail bed laceration that needs repair. Small hematomas can be treated by draining the blood through a small hole in the nail (trephination), which provides immediate pain relief.

Simple Nail Bed Laceration

A cut in the nail bed—often from a crush injury that cracks the nail. The nail is removed, the laceration is repaired under magnification with fine absorbable sutures, and the nail (or a substitute) is replaced to protect the repair and maintain the nail fold space.

Stellate (Crushed) Nail Bed Laceration

A complex, star-shaped laceration pattern from a severe crush. These require meticulous repair, often under a microscope, to align the nail bed fragments as precisely as possible.

Nail Bed Avulsion

A portion of the nail bed is torn away from the bone. Depending on the size of the defect, this may require a nail bed graft (taken from a toe or the same finger) to restore a surface for nail growth.

Why Proper Repair Matters

The nail bed is the template that produces the fingernail. If it heals with a scar, ridge, or irregularity, the nail that grows from it will have a permanent split, ridge, or deformity. Proper repair by a hand surgeon—with magnification, fine sutures, and careful tissue handling—gives you the best chance of a normal-appearing nail.

What to Expect After Nail Bed Repair

• Days 1–7: Fingertip is dressed and protected. Throbbing diminishes quickly.

• Weeks 2–4: The old nail (or substitute) loosens and falls off as the new nail begins growing underneath.

• Months 3–6: New nail growth becomes visible. Fingernails grow at about 3mm per month, so complete regrowth takes 3–6 months depending on which finger.

The final appearance of the nail may not be evident for 6–12 months. Even with perfect repair, some injuries result in minor nail irregularities, but most patients achieve a cosmetically acceptable result.

Associated Injuries

Nail bed injuries frequently involve:

• Fingertip (distal phalanx) fractures—present in the majority of significant nail bed injuries. These tuft fractures usually heal on their own with splint protection.

• Nail fold disruption—the nail fold must be maintained to allow proper nail regrowth

• Skin lacerations and soft tissue loss at the fingertip
  

Frequently Asked Questions

Should I go to the ER or a hand surgeon for a nail bed injury?

If the nail is intact and you just have blood under it, an ER or urgent care can drain the hematoma. If the nail is cracked, lifted, or the nail bed is visibly damaged, I recommend evaluation by a hand surgeon for proper repair—ideally within 24–48 hours.

Will my nail grow back after a nail bed injury?

In most cases, yes—as long as the germinal matrix (the nail-producing area at the base) is intact or properly repaired. The new nail may take several months to fully grow in.

Fingertip Injury Care in Phoenix

Don’t let a crushed fingertip become a permanently deformed nail. Proper early repair makes a significant difference. I see nail bed injuries urgently for patients across Phoenix, Scottsdale, Mesa, Chandler, Gilbert, and the surrounding areas.

☎ Schedule Your Consultation

Call (602) 258-4788 or visit toddrichardsmd.com to book an appointment with Dr. Todd Richards. Most insurance plans accepted. Same-week appointments often available.