Nursemaid's Elbow
Published on September 10, 2026
Risk Factors
Children aged 1 to 4 years (peak at 2 to 3 years), female predominance, left arm more commonly affected, history of prior episodes
Etiology
Axial traction (longitudinal pulling force) on an extended, pronated forearm causing the annular ligament to slip over the radial head
Presentation
A young child who suddenly refuses to move one arm after being pulled, lifted, or swung by the hand or wrist. The caregiver may report hearing a "click." The child is not crying in distress but simply will not use the limb (pseudoparalysis).
Classic Exam
The child holds the affected arm slightly flexed at the elbow and pronated, kept close to the body. There is no visible swelling, deformity, or bruising. The child resists supination and will not reach for objects with the affected hand. Point tenderness is typically absent or minimal over the lateral elbow.
Diagnostics
This is a clinical diagnosis. Radiographs are normal and are not required when the history and presentation are classic. X-rays are obtained only when the mechanism is unclear, there is concern for fracture, or reduction attempts fail.
Management
Closed reduction using either the supination-flexion technique or the hyperpronation technique. No splinting, casting, or imaging is needed after successful reduction. The child typically resumes full use of the arm within minutes.
KEYWORDS
"Pulled elbow," "child won't move arm," "lifted by hand," "pseudoparalysis," "no swelling or deformity," "clicking sound," "holding arm at side in pronation"
01Pathophysiology
The annular ligament is a ring-shaped band that wraps around the radial head and holds it snugly against the ulna at the proximal radioulnar joint. In young children (typically under age 5), this ligament is relatively thin, loose, and underdeveloped compared to older children and adults. The radial head itself is also not yet fully ossified and lacks the bulbous shape that prevents the ligament from sliding off in maturity.
When a sudden longitudinal pulling force is applied to the child's extended and pronated forearm, the radial head is pulled distally. This allows the annular ligament to slip partially over the radial head and become trapped or interposed within the radiohumeral joint. The ligament does not tear; it simply displaces from its normal position and becomes caught between the articular surfaces.
This interposition is what produces the child's refusal to move the arm. The trapped ligament causes pain with supination and flexion, so the child instinctively holds the forearm in a position of comfort: slight flexion and pronation. Because there is no fracture, dislocation, or soft tissue disruption, there is no swelling, ecchymosis, or visible deformity. The absence of these findings in a child who simply will not use the arm is the hallmark that should point you toward this diagnosis.
After approximately age 5, the annular ligament becomes thicker and the radial head develops a more prominent contour, making subluxation rare in older children. This is why the condition is almost exclusively seen in the 1-to-4-year age group.
02Classification and Clinical Manifestation
Nursemaid's elbow does not have a formal classification system. However, understanding the mechanism variants and their clinical features helps differentiate this from other pediatric elbow injuries.
Classic axial traction
DESCRIPTION
Child is pulled by the hand or wrist while the arm is extended and pronated (e.g., caregiver yanking the child away from danger, swinging the child by the arms, pulling the child through a crowd)
CLINICAL FEATURES
Sudden onset of arm immobility, no swelling, child holds arm in pronation and slight flexion
Rolling or falling mechanism
DESCRIPTION
Child rolls over the arm in bed or during play, trapping the forearm beneath the body in a pronated position
CLINICAL FEATURES
History may be vague or unwitnessed; same clinical appearance as classic traction injury
Recurrent episode
DESCRIPTION
Child has had one or more prior subluxations; recurrence rate is estimated at 20% to 30%
CLINICAL FEATURES
Caregiver may recognize the pattern and present early; same exam findings
MECHANISM | DESCRIPTION | CLINICAL FEATURES |
|---|---|---|
Classic axial traction | Child is pulled by the hand or wrist while the arm is extended and pronated (e.g., caregiver yanking the child away from danger, swinging the child by the arms, pulling the child through a crowd) | Sudden onset of arm immobility, no swelling, child holds arm in pronation and slight flexion |
Rolling or falling mechanism | Child rolls over the arm in bed or during play, trapping the forearm beneath the body in a pronated position | History may be vague or unwitnessed; same clinical appearance as classic traction injury |
Recurrent episode | Child has had one or more prior subluxations; recurrence rate is estimated at 20% to 30% | Caregiver may recognize the pattern and present early; same exam findings |
The hallmark across all variants is the combination of a young child, a mechanism involving traction or forced pronation, pseudoparalysis (refusal to use the arm without signs of distress at rest), and a normal-appearing elbow on inspection.
03Diagnostic Workup
Clinical history and physical examination
ROLE
Best initial and confirmatory approach
EXPECTED FINDING
Classic mechanism (pulling injury) + child holding arm pronated and slightly flexed + no swelling or deformity + refusal to supinate
Plain radiographs of the elbow (AP and lateral)
ROLE
Obtained only when diagnosis is uncertain, mechanism suggests fracture, or reduction attempts fail
EXPECTED FINDING
Normal in nursemaid's elbow; used to exclude supracondylar fracture, lateral condyle fracture, or other bony injury
Ultrasound
ROLE
Occasionally used in research settings; not standard practice
EXPECTED FINDING
May show displacement of the annular ligament, but clinical diagnosis remains preferred
TEST | ROLE | EXPECTED FINDING |
|---|---|---|
Clinical history and physical examination | Best initial and confirmatory approach | Classic mechanism (pulling injury) + child holding arm pronated and slightly flexed + no swelling or deformity + refusal to supinate |
Plain radiographs of the elbow (AP and lateral) | Obtained only when diagnosis is uncertain, mechanism suggests fracture, or reduction attempts fail | Normal in nursemaid's elbow; used to exclude supracondylar fracture, lateral condyle fracture, or other bony injury |
Ultrasound | Occasionally used in research settings; not standard practice | May show displacement of the annular ligament, but clinical diagnosis remains preferred |
The best initial test is clinical assessment. When a child younger than 5 presents with a classic pulling mechanism, holds the arm pronated and flexed, has no swelling or deformity, and refuses to use the limb, the diagnosis is made at the bedside. No imaging is required before attempting reduction.
Radiographs are not the confirmatory test for nursemaid's elbow. X-rays in this condition are normal because there is no fracture or true dislocation. The role of radiographs is purely to exclude alternative diagnoses when the presentation is atypical. Indications for obtaining X-rays include: an unclear or absent history of a pulling mechanism, visible swelling or deformity on exam, point tenderness over the distal humerus (raising concern for supracondylar fracture), failed reduction after two attempts, or any suspicion of non-accidental trauma.
The confirmatory "test" for nursemaid's elbow is really the successful reduction maneuver itself. When the correct technique is performed and the child resumes normal use of the arm within 5 to 15 minutes, this confirms the diagnosis. If the child does not improve after reduction, the diagnosis should be reconsidered and imaging obtained.
04Management and Treatment
INTERVENTION | DETAILS |
|---|---|
Supination-flexion technique | Stabilize the elbow with one hand, grip the child's hand with the other, fully supinate the forearm, then smoothly flex the elbow. A palpable "click" at the radial head confirms successful reduction. |
Hyperpronation technique | Stabilize the elbow, then firmly hyperprononate the forearm in one smooth motion. Evidence suggests this method has a higher first-attempt success rate and may cause less pain during the maneuver. |
Post-reduction care | No splinting or immobilization is needed. The child should resume normal arm use within 5 to 30 minutes. |
Failed reduction (after 2 attempts) | Obtain elbow radiographs (AP and lateral) to evaluate for occult fracture. Consider orthopedic consultation. |
Recurrence prevention | Educate caregivers to avoid pulling or lifting the child by the hands, wrists, or forearms. Advise lifting under the axillae instead. |
Prolonged or recurrent subluxation | If the subluxation has been present for several hours before reduction, a posterior splint for comfort and brief follow-up in 1 to 2 days may be considered, though this is not routinely required. |
Acute management begins with the reduction maneuver itself, which should be performed promptly once the diagnosis is clinically apparent. There is no need for sedation, analgesia, or imaging before the first attempt. Both the supination-flexion and hyperpronation techniques are acceptable. The hyperpronation technique is increasingly favored in the literature because of its higher first-attempt success rate (approximately 80% to 95%) and because it tends to be less painful for the child.
During the maneuver, a palpable or audible click over the radial head is the classic indicator that the annular ligament has returned to its anatomical position. After successful reduction, the child should be observed. Most children begin using the arm freely within 5 to 15 minutes. If the child does not resume use of the arm within 30 minutes, the reduction should be reattempted or the diagnosis reconsidered.
There is no role for immobilization, follow-up imaging, or orthopedic referral after a straightforward, successful reduction. Caregivers should be counseled about avoiding traction mechanisms. The recurrence rate is approximately 20% to 30%, and each episode is managed the same way. Some parents of children with multiple recurrences learn to perform the reduction themselves at home.
A key contraindication to blind reduction is any suspicion for fracture. If there is swelling, point tenderness over bone, deformity, or a mechanism involving a fall onto an outstretched hand rather than a pulling injury, do not attempt reduction before imaging.
05Differential Diagnosis and Distractors
Supracondylar fracture
WHY IT IS SIMILAR
Also presents in a young child refusing to move the arm after an injury; most common elbow fracture in children
KEY DISCRIMINATOR
Mechanism is a fall onto an outstretched hand (FOOSH), not a pulling injury. Exam reveals swelling over the distal humerus, point tenderness, and possibly ecchymosis. Posterior fat pad sign on lateral X-ray is a classic finding.
Lateral condyle fracture
WHY IT IS SIMILAR
A child with elbow pain and limited range of motion after a fall
KEY DISCRIMINATOR
Tenderness is localized to the lateral elbow. Swelling is present. X-ray shows a fracture line through the lateral condyle, often requiring surgical fixation.
Olecranon fracture
WHY IT IS SIMILAR
Refusal to extend the elbow in a child after a direct blow or fall
KEY DISCRIMINATOR
Exam shows posterior elbow tenderness and swelling. The child cannot actively extend the elbow against gravity. X-ray confirms the fracture.
Septic arthritis of the elbow
WHY IT IS SIMILAR
A child refusing to move the arm, which mimics pseudoparalysis
KEY DISCRIMINATOR
The child appears febrile and systemically ill. The joint is warm, erythematous, and swollen. Inflammatory markers (ESR, CRP, WBC) are elevated. Joint aspiration is diagnostic.
Non-accidental trauma (child abuse)
WHY IT IS SIMILAR
Young child with unexplained arm injury and an inconsistent or vague history
KEY DISCRIMINATOR
Look for injuries in various stages of healing, bruising in unusual locations (torso, buttocks, face), a history that does not match the injury pattern, or delay in seeking care. Skeletal survey may reveal old fractures.
Erb palsy (brachial plexus injury)
WHY IT IS SIMILAR
Arm held in a characteristic posture with limited movement; seen in young children
KEY DISCRIMINATOR
Typically occurs at birth (birth trauma). The arm is held in internal rotation and adduction ("waiter's tip" posture). Neurologic deficits (weakness, absent reflexes) are present rather than pain with movement.
DIFFERENTIAL | WHY IT IS SIMILAR | KEY DISCRIMINATOR |
|---|---|---|
Supracondylar fracture | Also presents in a young child refusing to move the arm after an injury; most common elbow fracture in children | Mechanism is a fall onto an outstretched hand (FOOSH), not a pulling injury. Exam reveals swelling over the distal humerus, point tenderness, and possibly ecchymosis. Posterior fat pad sign on lateral X-ray is a classic finding. |
Lateral condyle fracture | A child with elbow pain and limited range of motion after a fall | Tenderness is localized to the lateral elbow. Swelling is present. X-ray shows a fracture line through the lateral condyle, often requiring surgical fixation. |
Olecranon fracture | Refusal to extend the elbow in a child after a direct blow or fall | Exam shows posterior elbow tenderness and swelling. The child cannot actively extend the elbow against gravity. X-ray confirms the fracture. |
Septic arthritis of the elbow | A child refusing to move the arm, which mimics pseudoparalysis | The child appears febrile and systemically ill. The joint is warm, erythematous, and swollen. Inflammatory markers (ESR, CRP, WBC) are elevated. Joint aspiration is diagnostic. |
Non-accidental trauma (child abuse) | Young child with unexplained arm injury and an inconsistent or vague history | Look for injuries in various stages of healing, bruising in unusual locations (torso, buttocks, face), a history that does not match the injury pattern, or delay in seeking care. Skeletal survey may reveal old fractures. |
Erb palsy (brachial plexus injury) | Arm held in a characteristic posture with limited movement; seen in young children | Typically occurs at birth (birth trauma). The arm is held in internal rotation and adduction ("waiter's tip" posture). Neurologic deficits (weakness, absent reflexes) are present rather than pain with movement. |
06Traps and High-Yield Pearls
The most common way students get questions about nursemaid's elbow wrong is by ordering imaging before attempting reduction. When the vignette gives you a classic scenario, a 2-year-old child pulled by the arm who now refuses to move it with a completely normal-appearing elbow on inspection, the next best step is the reduction maneuver, not an X-ray. Selecting "obtain elbow radiographs" in this scenario is the designed trap answer. The test is evaluating whether you can recognize a clinical diagnosis and act on it without unnecessary workup.
A second common trap involves confusing nursemaid's elbow with a supracondylar fracture. Both occur in young children and both present with a child who will not move the arm. The discriminator the question writer builds into the vignette is the mechanism and the physical exam. Nursemaid's elbow follows a pulling mechanism and the elbow looks normal. A supracondylar fracture follows a fall and the elbow is swollen and tender. If the vignette mentions a fall or visible swelling, do not select nursemaid's elbow.
A third trap is the scenario where the child does not improve after the reduction maneuver. Students sometimes assume the reduction failed and select "reattempt reduction" indefinitely. After two failed attempts, the correct next step is imaging to look for an occult fracture that was mimicking the presentation.
Finally, remember that no immobilization is needed after successful reduction. A question that offers "apply a posterior splint and arrange orthopedic follow-up" as an answer choice after a successful reduction with the child using the arm normally is testing whether you know that the management ends at the bedside.
The core competency being tested is the ability to make a confident clinical diagnosis based on history and exam, perform definitive treatment without imaging, and correctly identify when the diagnosis should be questioned.