Elbow

Elbow Dislocation

An elbow dislocation is an emergency that needs prompt reduction and, in many cases, surgical stabilization. Dr. Peter FitzGibbons treats elbow dislocations and complex fracture-dislocations for patients throughout Montgomery County at our Bethesda and Germantown offices.

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What is elbow dislocation?

An elbow dislocation occurs when the bones of the joint separate, usually from a fall onto an outstretched hand. It causes severe pain, swelling, and visible deformity, and requires prompt reduction. Simple dislocations without fracture often heal with brief immobilization and early motion; complex dislocations with associated fractures, including the terrible triad, usually require surgery.

An elbow dislocation happens when the joint surfaces of the humerus (upper arm bone), radius, and ulna (forearm bones) separate from one another, either completely or partially, a partial separation called a subluxation (AAOS OrthoInfo). The elbow is held together by static structures, the bones themselves plus the medial (ulnar) collateral ligament and the lateral collateral ligament complex, and by dynamic structures, the muscles crossing the joint. Of these, the lateral ulnar collateral ligament is the single most important stabilizer against the rotational instability that produces most dislocations (Orthobullets).

Most dislocations follow a predictable, described injury sequence sometimes called the circle of Horii. A fall onto an outstretched hand drives the elbow into a combination of straightening force, inward bending stress, and forearm rotation. The lateral ligament complex tears first, then the radial head impacts the capitellum (the rounded end of the humerus), which can fracture the radial head. The joint then dislocates backward and outward, during which the coronoid process of the ulna can collide with and fracture against the humerus. Only last, and sometimes not at all, does the medial ligament and the forearm flexor muscle origin fail (PMC). A true dislocation involves near-complete disruption of the ligament envelope around the joint (Orthobullets).

Why Elbow Dislocations Happen

Elbow dislocations are the most common major joint dislocation after the shoulder, and the most common dislocated joint in children (Orthobullets). They account for 10 to 25 percent of all elbow injuries and occur most often between ages 10 and 20 (Orthobullets). Roughly 80 percent dislocate in the posterolateral direction, and the classic mechanism is a fall onto an outstretched hand with the elbow straight, combining axial load, inward stress, and forearm rotation (Orthobullets; AAOS OrthoInfo). Because the same fall can injure the whole arm, associated shoulder and wrist injuries occur in 10 to 15 percent of cases, so we examine the entire extremity, not just the elbow (Orthobullets). Loose ligaments and certain anatomic variants of the ulna's joint surface are recognized risk factors (AAOS OrthoInfo).

Symptoms — do you recognize these?

Severe pain immediately after a fall or direct blow to the elbow
Visible deformity, an "odd twist" appearance to the joint, with a complete dislocation
Swelling and inability to move the elbow
For a partial dislocation (subluxation): more subtle pain with motion, bruising, and a sensation of the joint shifting in and out of place
Numbness, tingling, or a cool, pale, or discolored hand, which signals possible nerve or blood vessel injury
With chronic instability: clicking, locking, or a feeling the elbow may give way, especially when the arm is straightened

A visibly deformed elbow after a fall, or any numbness, coolness, or color change in the hand, needs emergency evaluation right away rather than waiting for an office visit. These findings can indicate a nerve or blood vessel injury that needs urgent attention.

How we diagnose it

Physical examination. We check the skin for any break (an open dislocation changes the treatment plan significantly), feel for the tightness that signals compartment syndrome, and examine the wrist and shoulder on the same side given how often they are also injured. A full neurovascular exam, checking pulses, sensation, and hand movement, is essential because of the risk to the nearby brachial artery and nerves; if the artery is compromised, the hand will appear cool with a pale or purple color from poor blood flow (AAOS OrthoInfo; Orthobullets).

Imaging. X-rays taken from the front and side are the primary tool, both to confirm the dislocation and identify its direction and any associated fracture. We obtain X-rays both before and after reduction. CT scanning is used when a complex fracture pattern is suspected, to define the shape of a coronoid or radial head fracture for surgical planning, and three-dimensional CT reconstruction can help clarify how a fracture line runs (Orthobullets; AAOS OrthoInfo). MRI is rarely needed right away but can help evaluate ligament injury in select cases (AAOS OrthoInfo).

Post-reduction stability testing. After the joint is put back in place, we move it gently through its full range of motion to see whether it stays reduced throughout. An elbow that remains stable through the entire arc is considered clinically stable, which supports early, confident mobilization rather than prolonged immobilization (POGO Physio). This stability check is one of the most important factors in deciding between nonoperative treatment and surgery.

Classification: Simple, Complex, and Terrible Triad

Elbow dislocations are first divided by whether a fracture is present. A simple dislocation involves ligament injury only, with no associated fracture, and accounts for 50 to 60 percent of cases. A complex dislocation has one or more fractures in addition to the ligament injury (AAOS OrthoInfo; Orthobullets). Dislocations are also classified by direction, based on where the ulna sits relative to the humerus: posterior, posterolateral (the most common pattern, roughly 80 percent), posteromedial, anterior, medial, lateral, and divergent (Orthobullets).

The terrible triad is a specific and particularly difficult complex dislocation pattern: elbow dislocation plus a fracture of the radial head or neck plus a fracture of the coronoid process, all occurring together (Orthobullets; PMC). It was first described by Hotchkiss, and it carries a name earned by a historically poor medium- and long-term prognosis compared with simpler dislocation patterns (Radiopaedia). We describe this only as first characterized by Hotchkiss rather than citing a specific year, since the original description date is reported inconsistently across sources. It occurs mainly in adults, since children's more flexible ligaments make this exact combination of injuries unlikely in a growing skeleton (Radiopaedia). A systematic review found that terrible triad injuries frequently come with additional injuries beyond the three that define it, most often a fracture of the olecranon, occurring in roughly 27 percent of cases with any additional injury, followed by Essex-Lopresti injury, triceps tendon avulsion, and wrist fracture-dislocation (PMC).

Treatment options

Treatment depends heavily on whether the dislocation is simple or complex, and, if complex, on which specific structures are fractured. Every treatment plan begins with reduction, getting the joint back into alignment, which is typically done under sedation in an emergency setting before any further decisions are made.

Closed reduction

The dislocated joint is gently guided back into alignment by hand. Several described techniques for posterior and posterolateral dislocations avoid forceful traction; one well-studied method disengages the coronoid process from the humerus with gentle control of the olecranon, performed without an assistant or anesthesia, minimizing soft-tissue trauma compared with older traction-based techniques (PubMed). Similar leverage-based techniques report roughly 90 percent success when performed within 24 hours of injury (Springer).

When used: The first step for essentially every acute elbow dislocation, before any further imaging or treatment decisions.

Brief immobilization followed by early motion

For a simple dislocation confirmed stable through a full range of motion after reduction, current protocols favor a short period of immobilization, commonly cited around five to ten days and sometimes as brief as one week, followed by progressive motion exercises rather than prolonged casting. Randomized trial evidence shows early functional mobilization speeds the return of motion, function, and return to work compared with three weeks of plaster immobilization, though early motion causes somewhat more discomfort during the first six weeks (PMC).

When used: Simple, stable dislocations without an associated fracture, where post-reduction testing confirms the joint holds together through a full arc of motion.

Recovery & rehabilitation

Recovery depends heavily on which type of dislocation you had. Simple dislocations treated with early motion generally do well, though some loss of the last few degrees of full straightening is common and largely unavoidable even with good rehabilitation (Orthobullets). Immobilizing the elbow for more than about three weeks increases the risk of lasting stiffness, which is why we move away from casting toward supervised motion as early as safely possible (Orthobullets).

For terrible triad injuries treated with current surgical protocols, a review of 137 cases across five studies found an average follow-up motion arc of about 111 degrees of flexion and extension combined, with roughly 132 degrees of flexion and 135 degrees of forearm rotation, and functional outcome scores in the mid-to-high 80s out of 100 on standard elbow scoring systems, meaning function is generally restored but rarely returns to entirely normal (PMC). Patients recovering from terrible triad surgery should expect a longer, more structured course of physical therapy than a simple dislocation, and should be counseled honestly about the risk of joint stiffness, ulnar nerve irritation, and post-traumatic arthritis developing over time (PMC). Other recognized complications across both simple and complex dislocations include heterotopic bone formation (extra bone forming in the soft tissues around the joint), persistent stiffness, a specific pattern of instability called varus posteromedial instability, nerve or blood vessel injury, compartment syndrome, and recurrent instability (Orthobullets; Orthobullets). Patients throughout Montgomery County recovering from elbow surgery typically continue therapy at our Rockville physical therapy location for several months, with the pace individualized to fixation stability and motion at each visit.

Frequently Asked Questions

Is every elbow dislocation an emergency?

Yes, in the sense that every dislocated elbow needs prompt evaluation and reduction, ideally within hours. Waiting increases swelling, makes reduction more difficult, and raises the risk to the nerves and blood vessels that run close to the joint. Once the elbow is reduced and imaged, the treatment path branches: a simple, stable dislocation without fracture may need only brief immobilization and therapy, while a complex fracture-dislocation, including the terrible triad pattern, usually needs surgery. The urgency of the initial reduction does not necessarily mean every case ends up needing an operation.

What is a terrible triad injury?

It is a specific combination of three injuries occurring together: elbow dislocation, a fracture of the radial head or neck, and a fracture of the coronoid process of the ulna. This pattern, first described by Hotchkiss, earned its name because of a historically difficult recovery compared with a simple dislocation. Modern surgical protocols that systematically address the coronoid, the radial head, and the lateral ligament in sequence have improved outcomes substantially, though most patients still fall short of completely normal motion, typically landing in the range of a fairly functional but not fully symmetric elbow.

Will my elbow need surgery?

It depends on whether a fracture is present and whether the joint stays in place after it is put back into alignment. A simple dislocation, ligament injury only, that proves stable through a full range of motion on post-reduction testing is usually treated without surgery, using brief immobilization followed by early motion exercises. A complex dislocation with an associated fracture, or a simple dislocation that remains unstable despite reduction, generally does need surgery to restore a stable, functional joint.

How long until I can use my arm normally again?

For a simple, stable dislocation, most patients regain functional motion within six to twelve weeks, though the very last few degrees of full extension often take longer to return and sometimes never fully do. For a terrible triad injury treated surgically, recovery is measured in months rather than weeks, with structured physical therapy continuing well beyond the initial healing period. Return-to-sport or heavy-labor timelines are individualized based on fixation stability, strength, and motion rather than a fixed calendar date.

Why does my elbow still feel unstable after treatment?

Residual instability can result from incomplete ligament healing, an unrecognized fracture fragment, or scar tissue that limits normal joint mechanics. This is more common after complex dislocations than simple ones. If your elbow catches, locks, or feels like it may give way months after your injury, it is worth a re-evaluation, since chronic instability is treatable, sometimes with bracing and targeted therapy and sometimes with ligament reconstruction, but it does need appropriate imaging and examination to identify what specifically is causing it.

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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