Hand & Wrist

Ulnar Impaction Syndrome

Ulnar impaction syndrome is a common, treatable cause of chronic wrist pain that responds well to a staged approach. Dr. Peter FitzGibbons evaluates and treats this condition for patients throughout Montgomery County at our Bethesda and Germantown offices.

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What is ulnar impaction syndrome?

Ulnar impaction syndrome is a degenerative wrist condition in which the ulna presses excessively against the triangular fibrocartilage complex and nearby carpal bones, most often because the ulna is relatively longer than the radius. It causes chronic ulnar-sided wrist pain, clicking, and weak grip, and is treated with splinting, injections, or a shortening procedure when conservative care fails.

Ulnar impaction syndrome, also called ulnocarpal abutment syndrome, develops when too much load is transmitted through the ulna, the smaller of the two forearm bones, into the triangular fibrocartilage complex (TFCC) and the adjacent carpal bones on the small-finger side of the wrist. The TFCC is a cartilage and ligament structure that cushions and stabilizes the wrist between the ulna and the carpal bones. When the ulna is relatively too long compared with the radius, a condition called positive ulnar variance, it bears a disproportionate share of the load every time you grip or turn your wrist.

The biomechanics of this are well quantified. With the radius and ulna at neutral length relative to each other, the radius carries roughly 82 percent of the axial load through the wrist and the ulna carries about 18 percent. Lengthen the ulna by just 2.5 millimeters and the ulna's share rises to nearly 42 percent; shorten it by the same amount and the ulna's share drops to about 4 percent (Algorithm-Guided Treatment of Ulna Impaction Syndrome, PMC). That relationship explains both why the condition develops and why shortening procedures work.

Positive ulnar variance can be present from birth or can develop after an injury, most commonly a distal radius fracture that heals with the radius slightly shortened, a growth plate injury, or a torn interosseous membrane between the radius and ulna. Repetitive gripping and forceful wrist rotation, as seen in racquet sports, gymnastics, and golf, are believed to accelerate the process, though this specific activity link reflects general clinical experience rather than a single dedicated study. Left untreated, chronic overload wears through the central TFCC, damages the cartilage of the ulnar head and the adjacent lunate and triquetrum bones, and in advanced cases tears the lunotriquetral ligament that connects two of the carpal bones (Algorithm-Guided Treatment of Ulna Impaction Syndrome, PMC; Triangular Fibrocartilage Complex, StatPearls).

Symptoms — do you recognize these?

Ulnar impaction typically develops gradually rather than from a single injury, and the pattern below should prompt evaluation.

Chronic pain on the small-finger side of the wrist
Pain that worsens with gripping, twisting a doorknob or jar lid, or rotating the forearm
Clicking or a mechanical sensation with wrist motion
Reduced grip strength
Tenderness directly over the ulnar side of the wrist
Symptoms that build slowly over months rather than appearing overnight

If ulnar-sided wrist pain is persistent, limits your grip, or has followed a prior wrist fracture, call our office for an evaluation rather than waiting for it to resolve on its own.

How we diagnose it

Diagnosis starts with standardized wrist X-rays taken with the forearm in neutral rotation, which allow precise measurement of ulnar variance, the relative length difference between the radius and ulna that drives this condition (Algorithm-Guided Treatment of Ulna Impaction Syndrome, PMC). On exam, we look for tenderness at the ulnar fovea, the soft spot near the base of the ulna, and use provocative maneuvers that combine ulnar deviation with axial compression to reproduce the clicking and pain patients describe; this exam approach reflects standard hand-surgery teaching rather than a single study finding.

MRI is used to assess the condition of the TFCC, detect early cartilage or bone marrow changes in the lunate, triquetrum, and ulnar head, and evaluate the lunotriquetral ligament (Algorithm-Guided Treatment of Ulna Impaction Syndrome, PMC; Magnetic Resonance Imaging of the Triangular Fibrocartilage Complex, LWW). When the diagnosis remains unclear or surgery is being considered, wrist arthroscopy provides the most direct view of the TFCC and surrounding cartilage and is considered the gold standard for confirming the extent of damage (Algorithm-Guided Treatment of Ulna Impaction Syndrome, PMC).

The degenerative changes seen in ulnar impaction are described using the Palmer classification, discussed further below, which stages the severity from early cartilage thinning through advanced arthritis.

Treatment options

Most patients begin with non-surgical care, and treatment escalates based on the degree of TFCC and cartilage damage seen on imaging and, when needed, arthroscopy.

Activity modification and splinting

Limiting the gripping and forceful forearm rotation that provoke symptoms, combined with a splint or brace that restricts ulnar deviation and rotation while the joint settles.

When used: First-line treatment for most patients, particularly earlier degenerative changes.

NSAIDs

Oral anti-inflammatory medication used to reduce pain and swelling in the ulnocarpal joint.

When used: Alongside activity modification and splinting during the initial treatment period.

Corticosteroid injection

An injection placed directly into the ulnocarpal joint to reduce inflammation and pain, particularly useful when the lunotriquetral ligament is still intact.

When used: Persistent symptoms despite splinting and activity changes, especially in earlier-stage disease (Triangular Fibrocartilage Complex, StatPearls).

Surgical Procedure

Wrist Arthroscopy

Diagnostic and operative arthroscopic evaluation of the wrist joint to assess and treat TFCC tears, scapholunate ligament injuries, synovitis, and loose bodies with minimal disruption to surrounding structures.

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Recovery & rehabilitation

Recovery depends heavily on which procedure is performed. After the arthroscopic wafer procedure, most patients return to work in roughly four weeks, since there is no bone to heal, only soft tissue and small portal incisions. After ulnar shortening osteotomy, recovery is longer because the bone must heal, and return to work is typically closer to eight weeks, sometimes longer for patients in physically demanding jobs (Algorithm-Guided Treatment of Ulna Impaction Syndrome, PMC).

A meaningful tradeoff with osteotomy is hardware. Because a plate and screws hold the bone while it heals, a substantial proportion of patients, roughly 63 percent in one analysis, eventually have the hardware removed once healing is complete due to irritation from the plate (Algorithm-Guided Treatment of Ulna Impaction Syndrome, PMC). Both procedures produce durable improvement in pain, function, and grip strength at long-term follow-up. For isolated degenerative TFCC tears treated arthroscopically, one series reported 98 percent patient satisfaction and return to work by around nine weeks (Triangular Fibrocartilage Complex, StatPearls). Patients often underestimate how much grip strength and forearm rotation improve once the underlying mechanical overload is corrected, but they should also expect a gradual return of full strength over several months rather than an immediate change.

Frequently Asked Questions

What is the difference between the wafer procedure and ulnar shortening osteotomy?

The wafer procedure is done entirely through arthroscopic portals and removes a few millimeters of bone from the tip of the ulna without cutting all the way through it, so there is no fracture to heal and recovery is faster. Ulnar shortening osteotomy cuts through the ulna shaft, removes a segment of bone, and fixes it back together with a plate, which requires the bone to heal over several weeks. Outcomes for pain, grip strength, and function are similar between the two, but the wafer procedure has fewer complications and a faster return to work, while osteotomy is generally preferred when the lunotriquetral ligament is torn.

Do I need surgery for ulnar impaction syndrome?

Not necessarily. Many patients improve with activity modification, splinting, anti-inflammatory medication, and a corticosteroid injection, particularly when the changes on imaging are mild and the ligaments of the wrist are intact. Surgery is considered when these measures fail to control symptoms or when imaging and arthroscopy show more advanced cartilage or ligament damage that is unlikely to improve without correcting the underlying mechanical overload.

Will I need the hardware removed after ulnar shortening osteotomy?

It is common. Roughly six in ten patients eventually have the plate and screws removed once the bone has fully healed, usually because the hardware is palpable or irritating beneath the skin near the wrist. This is a separate, generally shorter procedure done after the osteotomy site is solidly healed, and it does not mean the original surgery failed.

Can ulnar impaction syndrome come back after treatment?

Both the wafer procedure and ulnar shortening osteotomy produce durable results in most patients followed for up to ten years, since they directly correct the load imbalance that caused the problem. Recurrence is uncommon when the correct procedure is matched to the severity of disease, though patients who return to very high-demand gripping or racquet sports should expect ongoing monitoring.

How long until I can return to sports or heavy grip work after surgery?

After the arthroscopic wafer procedure, most patients return to work within about four to five weeks, and light sport can often resume around that time depending on demands. After ulnar shortening osteotomy, return to work typically takes about eight weeks, and full return to high-demand gripping or racquet sports usually waits until the bone shows solid healing on X-ray, often three to four months.

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Peter G. Fitzgibbons, MD

Hand Surgery · Orthopedic Surgery

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Medically reviewed by Peter G. Fitzgibbons, MD, MD

Last reviewed August 5, 2026