Anterior elbow dislocations, like all elbow dislocations, occur after a traumatic event.  Patients will typically have a history of some mechanism, causing them to fall onto their outstretched arm or a more severe trauma to the arm like a motor vehicle accident. Patients will complain of severe pain to the injured extremity and will be unable to move the injured elbow. Also, patients may complain of a noticeable deformity of the affected elbow depending on body habitus and the nature of the dislocation.

While obtaining the history, it is important to ask the patient if they have previously dislocated or had any history of injury to the dislocated elbow. The provider should also ask the patient if they are having any new onset of numbness, tingling, or weakness in the injured extremity as damage to neurovascular structures can be associated with anterior elbow dislocations. Neurovascular compromise can affect the urgency of reduction and operative fixation. Another important aspect before moving on to the physical evaluation is to ask if the patient has had any head trauma, loss of consciousness, or have any other areas of pain as this will influence what further workup will need to be done. Finally, each patient should be asked to provide their complete medical history, congenital deformities, and medications that can affect your diagnosis and treatment moving forward.

The initial evaluation should begin with an inspection of the patient and a physical exam. Clinicians should evaluate for additional injuries visually and by palpating along other bones and joints. On evaluation, the injured extremity should be inspected for open fractures, swelling, skin changes, and neurovascular status. Palpation along the injured extremity should be done to make sure all compartments are compressible. If a compartment is too full to compress, then the examiner should be concerned for compartment syndrome, which is an operative emergency. If the patient has compartment syndrome, their neurovascular status will be diminished. Vascular status can be examined by observing the color of the extremity, palpating the temperature of the skin, the radial and ulnar pulses at the wrist, and capillary refill of the fingers. Neurological status can be evaluated by checking for sensation along the length of the extremity and having patients perform tasks to demonstrate motor function. Compartment syndrome, an open fracture, or neurovascular compromise all warrant emergent evaluation by an orthopedic surgeon.

The most common nerves injured during an elbow dislocation are the median and ulnar nerves. The median nerve sensation can be evaluated by light touch to the palmar aspect of the thumb and index finger. The motor function of the median nerve can be tested by observing the strength of thumb opposition.[9] Ulnar nerve sensation can be determined by light touch over the palmar aspect of the fourth and fifth digits. The motor function of the ulnar nerve is assessed by observing the strength of abduction and adduction of the fingers.

After the physical exam, radiographic images should be obtained. Initial radiographic evaluation of the injured extremity should begin with anterior-posterior, lateral, and oblique views. It is also important to get anterior-posterior and lateral X-rays of the forearm, wrist, and shoulder to evaluate for any other injuries.

Initial management should always be closed reduction. The reduction can help decrease pain and swelling as well as taking pressure off of soft tissue and neurovascular structures. Anterior elbow dislocations require modification to the typical elbow reduction maneuvers.[10]

In most cases, the patient will need intravenous sedation to relax the muscles allowing for proper manipulation for reduction. Once the patient is adequately sedated, traction should be applied to the arm. Ideally, there are two providers pulling traction, one on the forearm with the other pulling counter traction on the humerus. For an anterior elbow dislocation, the reduction is performed by flexing the elbow while pulling traction and applying a downward force on the proximal forearm.[11] After reduction, the stability of the elbow should be tested with range of motion and varus and valgus stress. An unstable elbow after reduction is more likely to need operative intervention than a stable elbow. Neurovascular status of the extremity should also be reevaluated after reduction. A posterior, long arm splint should then be applied with the elbow flexed at ninety degrees. After the splint is in place, post-reduction radiographs should be taken to ensure the elbow is adequately reduced.

The patient should remain splinted and follow up in five to ten days from the time of reduction.[9] At that point, the patient’s elbow should be reexamined for stability, neurovascular status, and radiographically. If the elbow remains unstable or demonstrates a fracture on x-ray, the patient will require operative intervention. If the elbow is stable on exam, then the patient may begin early range of motion to prevent stiffness. Elbows tend to get stiff if they are immobilized for more than three weeks. After about twenty-one days of immobilization, it becomes very difficult for the patient to regain full range of motion of their elbow.

Anterior elbow dislocations tend to be a clinical diagnosis and are confirmed by radiographic images. However, when a patient presents after a trauma with elbow pain, there are other diagnoses that need to be considered. A number of injuries can present as elbow pain, such as a distal humerus fracture, fracture of the radial head, fracture of the olecranon, or purely ligamentous injuries. It is important to approach each patient with a list of differential diagnoses and to use the history, physical exam, and imaging modalities to lead to an accurate diagnosis.

The most common lifelong negative outcome after an anterior elbow dislocation is the loss of terminal extension. Patients who have a simple anterior elbow dislocation have a strong chance of regaining full range of motion after recovery. However, patients with injuries that require periods of greater than three weeks of immobilization, such as complex anterior elbow dislocations or those with neurovascular injuries, tend to lose terminal extension. It is not uncommon for patients to lose up to ten to fifteen degrees of terminal extension after an elbow dislocation.[12]

Common complications associated with anterior elbow dislocations are the same as those associated with elbow dislocations in general. Stiffness with range of motion, and more specifically loss of terminal extension, is the most common complication after an elbow dislocation. This occurs with prolonged immobilization, typically greater than three weeks, and can be improved by physical therapy focusing on range of motion.

Persistent elbow instability is another complication that can occur after an elbow dislocation. Varus instability is the most common and is due to insufficiency of the lateral collateral ligament. Lateral collateral ligament insufficiency can be treated by splinting in pronation but may require surgical repair.[12]

Neurovascular injury can be a complication of an anterior elbow dislocation. The three neurovascular structures of the elbow most commonly injured is the ulnar nerve, median nerve, and brachial artery. Ulnar nerve neuropraxia is the most common injury due to stretching of the nerve during the dislocation, with median nerve neuropraxia following second to it. Neuropraxias are initially managed by observation and typically resolve over time. Median nerve entrapment can occur in the instance where there is a fracture, and this warrants surgical exploration of the nerve. [1] Finally, injury to the brachial artery is a rare occurrence usually associated with severe, open fracture-dislocations. Pulses typically return after reduction, however in the instance where they do not further workup and surgical intervention is required.[13]

Patients should be educated that stiffness of the elbow is very common following an elbow dislocation, and they should work to try to achieve full range of motion as early as they can.  The normal range of motion of the elbow is zero to one hundred fifty degrees, whereas functional range of motion of the elbow is thirty to one hundred thirty degrees.[14] Patients who have stiffness following an injury are encouraged to strive towards a functional range of motion so they can remain independent with their activities of daily living.

Anterior elbow dislocations require communication within the interprofessional team. Anterior elbow dislocations should be urgently examined by the clinician to make sure the patient's upper extremity is neurovascularly intact, with no compartment syndrome, and no fracture or open fracture. The closed reduction and splinting can be done by the emergency provider or by the orthopedic surgeon. Close follow up with the orthopedic surgeon is very important, and this is where effective communication within the interprofessional team is essential. The team needs to make sure they are informed about the patient and make sure the patient has the information they need to follow up in a timely manner for re-evaluation. This effective communication within the team improves patient outcomes.