A broken finger that heals in the wrong position is called a malunion, and fixing it almost always requires surgery. The procedure, called a corrective osteotomy, involves re-breaking the bone in a controlled way, realigning it, and securing it with small plates and screws so it heals correctly the second time. Non-surgical options like splinting or therapy can manage symptoms but cannot reshape bone that has already fused in the wrong position.
How to Tell if Your Finger Healed Wrong
A malunion can show up in several ways. The most common signs are visible crookedness, one finger crossing over another when you make a fist (called scissoring), stiffness in the middle joint, and weaker grip strength. Some people notice their finger doesn’t fully straighten, creating a slight claw-like posture. Others find that the finger looks mostly fine at rest but clearly overlaps a neighboring finger when they curl their hand closed.
The underlying problem falls into three categories: the bone healed at an angle, it healed with a twist (rotation), or it healed shorter than it should be. You can have a combination. Rotational deformity is especially problematic because even a few degrees of twist at the bone translates into noticeable overlap at the fingertip. Angular deformity can disrupt tendon balance, making it harder to fully extend the finger. Shortening can leave a bony bump that physically blocks the joint from bending all the way.
What Happens if You Leave It Alone
A finger malunion won’t correct itself over time. Left untreated, the functional problems typically stay the same or get worse. Scissoring fingers interfere with gripping, typing, and any task requiring fine motor control. The disrupted tendon balance can cause a progressive lag in extension, meaning the finger gradually loses the ability to straighten fully. If the fracture originally involved the joint surface, the misalignment accelerates cartilage wear, leading to stiffness and arthritis in that joint.
Delayed treatment also makes eventual surgical correction harder. The longer a malunion exists, the more the surrounding soft tissues adapt to the new position. Tendons scar down, joint capsules tighten, and the reconstruction becomes more complex with generally worse outcomes compared to earlier intervention.
When Non-Surgical Treatment Can Help
If a fracture is fresh, minimally displaced, and still has acceptable alignment, splinting or buddy taping to an adjacent finger can work well. Certain injuries like mallet finger (a drooping fingertip) respond to splinting even up to three months after the initial injury. But once the bone has fully healed in the wrong position, splinting and hand therapy cannot move it back. What therapy can do is manage stiffness and strengthen the surrounding muscles, which helps with function even if the alignment stays imperfect.
For mild malunions that cause cosmetic concern but minimal functional problems, some people choose to skip surgery and focus on therapy to maximize what the finger can do. The decision really comes down to how much the misalignment affects your daily use of that hand. Persistent rotational deformity, however, reliably causes poor functional and cosmetic outcomes and is the type least likely to be manageable without surgery.
How Corrective Osteotomy Works
The surgery is performed through an incision on the back of the finger. The surgeon splits the extensor tendon to reach the bone, then uses a small saw to cut through the bone at the midpoint of the malunion. If scar tissue around the joint or tendons is limiting motion, the surgeon releases it at the same time.
Once the bone is cut, the two pieces can be repositioned. For rotational problems, the surgeon twists the end segment into the correct alignment. For angular problems, a wedge of bone is either removed or the cut is opened on one side to straighten things out. To check alignment during surgery, the surgeon passively closes the hand into a fist and confirms that all fingers point toward the base of the thumb without overlapping.
A thin temporary wire is placed down the center of the bone to hold the pieces while a small metal plate (about 1.7 mm wide for the larger finger bone, 1.2 mm for the smaller one) is fixed to the back of the bone with tiny screws, at least three on each side of the cut. This internal hardware stays permanently in most cases, though it can be removed later if it causes irritation.
Recovery After Surgery
You’ll wear a splint for several weeks after the procedure. Physical therapy typically begins once the surgeon confirms early bone healing, usually within a few weeks. The focus starts with gentle range-of-motion exercises and progresses to grip strengthening as the bone solidifies. Full recovery takes 6 to 12 weeks, with hand function improving gradually throughout that window.
Grip strength and joint motion generally improve significantly compared to before surgery. In studies of corrective osteotomies for similar bone malunions, grip strength increased by roughly 30 to 40 percent at one year, and most measures of range of motion showed meaningful gains. The one area that tends to improve least is full extension, so if your finger currently has trouble straightening completely, expect some improvement but possibly not a full return to normal.
Risks and Complications
Corrective osteotomy is not a minor procedure, and the complication rate is meaningful. In one study of 60 patients who underwent corrective osteotomy for bone malunion, 25 experienced a complication, and 13 needed additional surgery. The most common problems were the re-cut bone failing to heal (nonunion) or healing very slowly, which occurred in about 1 in 6 cases. Tendon irritation or rupture from the nearby hardware is another recognized risk, particularly for the tendons that run along the back of the hand.
Stiffness is the other major concern. Surgery on finger bones inevitably causes some scarring of the tendons that glide over them. The surgeon often has to release adhesions during the initial procedure, and aggressive hand therapy afterward is essential to prevent new ones from forming. Infection and nerve injury are possible but less common. Overall, most patients end up with better function than they had before surgery, but it’s worth understanding that the path to get there can be bumpy.
What to Expect at Your First Appointment
A hand surgeon will take X-rays from multiple angles to measure exactly how much the bone is angled, rotated, or shortened. They’ll watch you make a fist to check for scissoring and test your grip strength and range of motion. If the malunion involves a joint surface, a CT scan may be needed to assess cartilage damage and plan the surgical approach more precisely.
The key question the surgeon is answering is whether the degree of deformity justifies the risks of surgery. Small angular deformities that don’t cause functional problems may be best left alone. Rotational deformities, joint involvement, and any malunion causing finger overlap or significant grip weakness are the clearest candidates for surgical correction. The sooner after the original injury you’re evaluated, the simpler the reconstruction tends to be.