Pediatric Gartland Type III Supracondylar Humerus Fracture: Case Study on Closed Reduction & Pinning

Patient Presentation and History

The pediatric supracondylar humerus fracture represents one of the most common and potentially limb-threatening injuries encountered in orthopedic trauma, demanding a meticulous, protocol-driven approach. This case study focuses on a 6-year-old male who presented to the emergency department following a high-energy fall from monkey bars. The mechanism of injury involved a direct impact onto an outstretched left hand with the elbow locked in hyperextension. This classic extension-type mechanism accounts for approximately 95 percent of all supracondylar humerus fractures, driving the olecranon into the olecranon fossa and creating a fulcrum that ultimately fails the thin supracondylar region of the distal humerus.

Upon arrival, approximately two hours post-injury, the patient was in acute distress, complaining of severe left elbow pain and exhibiting gross deformity. The parents reported no loss of consciousness, head trauma, or other associated injuries. A thorough primary survey was negative for polytrauma. The patient had an unremarkable past medical history, no known drug allergies, and was up to date on all childhood immunizations. There were no underlying metabolic bone diseases, connective tissue disorders, or prior elbow trauma.

In pediatric trauma, it is imperative to ascertain the exact mechanism and ensure it correlates with the injury pattern. The history provided by the parents was consistent with the high-energy axial load and hyperextension forces required to produce a severely displaced Gartland Type III fracture. Non-accidental trauma was considered, as is standard in all pediatric injuries, but the history was consistent, witnessed, and lacked any red flags such as delayed presentation, changing stories, or unexplained bruising in different stages of healing. The primary clinical focus immediately shifted to assessing the neurovascular status of the limb, given the high risk of brachial artery compromise and nerve entrapment associated with this specific displacement pattern.

Clinical Examination Findings

Inspection and Soft Tissue Assessment

Initial inspection revealed a highly swollen, ecchymotic left elbow with a characteristic S-shaped deformity in the sagittal plane, strongly indicative of posterior displacement of the distal articular fragment. The anterior soft tissues were tense. A critical finding to evaluate in these presentations is the "pucker sign" or dimpling of the anterior skin. This occurs when the proximal fracture fragment penetrates the brachialis muscle and tethers the deep dermis. While absent in this specific patient, its presence indicates a high-energy injury with significant soft tissue disruption, often necessitating open reduction due to soft tissue interposition blocking closed reduction maneuvers. No open wounds or skin tenting were present, confirming a closed injury, but the degree of swelling raised immediate concerns for impending compartment syndrome of the forearm.

Vascular Assessment and Perfusion

Palpation elicited diffuse tenderness circumferentially around the distal humerus, with a completely distorted relationship between the medial epicondyle, lateral epicondyle, and olecranon tip. The vascular examination is the most critical component of the initial assessment. In this patient, the radial and ulnar pulses were palpable but subjectively diminished compared to the contralateral uninjured extremity. Capillary refill in the digits was delayed at 3 to 4 seconds, and the hand was cool but pink.

This presentation of a "pink, pulseless" or "pink, diminished pulse" hand is a well-documented phenomenon in displaced supracondylar fractures. It typically indicates that while the brachial artery may be kinked, stretched over the proximal fragment, or in spasm, collateral circulation is currently sufficient to maintain distal viability. This contrasts sharply with a "white, pulseless" hand, which represents a true vascular emergency requiring immediate intervention. The presence of diminished pulses coupled with severe swelling mandated urgent fracture reduction to restore normal arterial flow and mitigate the risk of Volkmann ischemic contracture.

Neurological Assessment and Nerve Palsy Patterns

A comprehensive neurological examination was performed, recognizing that nerve injuries occur in up to 10 to 20 percent of displaced supracondylar fractures. The pattern of nerve injury often correlates with the direction of fracture displacement.

The anterior interosseous nerve (AIN), a motor branch of the median nerve, is the most frequently injured nerve in extension-type posterolateral displacements. AIN function was tested by asking the child to form an "OK" sign; the patient demonstrated the ability to flex the interphalangeal joint of the thumb and the distal interphalangeal joint of the index finger, though effort was limited by pain. The radial nerve, more commonly injured in posteromedial displacements, was assessed via sensation in the dorsal first web space and the ability to extend the wrist and digits. The ulnar nerve, typically at risk in flexion-type injuries or iatrogenically during medial pinning, was evaluated via sensation to the little finger and intrinsic muscle function.

While gross neurological function appeared intact in this patient, the extreme pain and apprehension inherent in pediatric trauma limited the reliability of motor strength testing. The baseline exam was meticulously documented to differentiate between traumatic nerve palsy and potential iatrogenic injury following surgical intervention.

Imaging and Diagnostics

Standard Radiographic Evaluation

Immediate plain radiography is the cornerstone of diagnosis. True anteroposterior and lateral views of the left elbow were obtained. Achieving orthogonal views in a pediatric patient with a grossly unstable and painful elbow is challenging; thus, the X-ray beam is often rotated around the immobilized arm rather than manipulating the extremity.

The lateral radiograph confirmed a complete fracture through the supracondylar region with marked posterior displacement and extension of the distal fragment. There was no cortical contact between the proximal and distal fragments. The anterior humeral line, drawn along the anterior cortex of the humeral shaft, passed completely anterior to the capitellum, confirming the extension deformity. Normally, this line should intersect the middle third of the capitellar ossification center. Furthermore, a pronounced posterior fat pad sign was visible, indicative of a large joint effusion and capsular distension.

Radiographic Landmarks and Measurements

The anteroposterior radiograph demonstrated posteromedial displacement of the distal fragment. This is a critical biomechanical observation. In posteromedial displacement, the lateral periosteal hinge is torn, while the medial periosteal hinge remains intact. This intact medial hinge will dictate the reduction maneuver, requiring pronation of the forearm to tension the hinge and lock the fracture into place.

Baumann's angle, formed by the intersection of a line perpendicular to the longitudinal axis of the humeral shaft and a line drawn along the physeal line of the lateral condyle, was unmeasurable due to the severe displacement. Restoration of Baumann's angle (normally 70 to 75 degrees) is a primary intraoperative goal to prevent post-traumatic cubitus varus deformity. The teardrop shadow, representing the confluence of the coronoid and olecranon fossae, was disrupted, further confirming the complete structural failure of the distal humerus.

Advanced Imaging Modalities

Advanced imaging, such as Computed Tomography (CT) or Magnetic Resonance Imaging (MRI), is rarely indicated in the acute management of typical pediatric supracondylar humerus fractures. Plain radiographs are overwhelmingly sufficient for classification and surgical planning. However, in extremely young children (under 2 years of age) where the capitellar ossification center is not yet visible, differentiating a supracondylar fracture from a transphyseal separation of the distal humerus can be difficult. In such rare, ambiguous cases, ultrasonography or an MRI might be considered to visualize the unossified cartilaginous structures. In this 6-year-old patient, the ossification centers were well-defined, and the fracture pattern was unequivocally clear on plain films, rendering advanced imaging unnecessary and an inappropriate delay to definitive care.

Differential Diagnosis

While the clinical and radiographic presentation of a displaced supracondylar fracture is often straightforward, several other pediatric elbow injuries can present with similar mechanisms, swelling, and pain. Accurate differentiation is critical, as the surgical approach, fixation strategy, and postoperative protocols vary significantly among these pathologies.

Surgical Decision Making and Classification

Gartland Classification System

The surgical decision-making process for supracondylar humerus fractures is heavily guided by the Gartland classification system, which categorizes these injuries based on the degree of displacement observed on the lateral radiograph.
* Type I: Nondisplaced or minimally displaced fractures. The anterior humeral line still intersects the capitellum. These are managed non-operatively with cast immobilization.
* Type II: Displaced fractures with an intact posterior cortex (hinge). The anterior humeral line passes anterior to the capitellum. These typically require closed reduction and percutaneous pinning to prevent late displacement and malunion.
* Type III: Completely displaced fractures with no cortical contact. These are highly unstable, carry a significant risk of neurovascular compromise, and universally require operative intervention.
* Type IV: A later modification by Leitch describing a fracture with multidirectional instability (flexion and extension) due to the complete circumferential tearing of the periosteum. This is often diagnosed intraoperatively when the fracture lacks a stable hinge in any direction.

Our patient presented with a classic Gartland Type III fracture. The complete lack of cortical contact and severe posteromedial displacement dictated an absolute indication for urgent surgical intervention.

Biomechanical Considerations for Fixation

The gold standard for the treatment of displaced pediatric supracondylar humerus fractures is closed reduction and percutaneous pinning (CRPP). The debate regarding the optimal pin configuration—crossed pins (one medial, one lateral) versus widely divergent lateral pins—is one of the most extensively researched topics in pediatric orthopedics.

Biomechanical studies consistently demonstrate that a crossed-pin construct offers superior torsional rigidity and overall stiffness compared to lateral-only pins. This biomechanical advantage is particularly relevant in highly unstable Type III and Type IV fractures, or when medial column comminution is present. However, the medial pin carries a well-documented risk of iatrogenic injury to the ulnar nerve, which can occur via direct penetration, tethering by the pin, or compression within the cubital tunnel due to swelling.

Conversely, widely spaced, divergent lateral pins avoid the ulnar nerve entirely and provide adequate stability for the majority of supracondylar fractures if placed correctly (maximizing separation at the fracture site and engaging both the medial and lateral columns proximally).

In this specific case, the presence of medial column comminution and the severe degree of instability led to the decision to utilize a crossed-pin configuration. The surgical plan prioritized maximum biomechanical stability to prevent loss of reduction, coupled with meticulous, nerve-sparing techniques for the medial pin insertion to mitigate the risk of iatrogenic ulnar neuropathy.

Indications for Operative Intervention

The indications for urgent operative intervention in this patient were multifold. First, the Gartland Type III classification inherently demands surgical stabilization due to unacceptable alignment and high risk of secondary displacement. Second, the diminished distal pulses and delayed capillary refill elevated the acuity of the case. While not a completely ischemic "white" hand, the compromised perfusion necessitated prompt reduction to unkink the brachial artery and restore normal hemodynamics. Delaying surgery in the presence of altered perfusion increases the risk of compartment syndrome and irreversible ischemic damage to the volar forearm musculature.

Management of the Pulseless Extremity

The management algorithm for a pulseless extremity associated with a supracondylar fracture is highly specific. If the hand is pink and well-perfused but pulseless (as seen in our patient), the immediate step is urgent closed reduction and pinning. In the vast majority of cases, anatomic reduction relieves the tension on the brachial artery, and the pulse returns. If the hand remains pink and pulseless after rigid fixation, observation is appropriate, as collateral circulation is adequate.

However, if the hand is white, cool, and pulseless, this is a surgical emergency. If closed reduction and pinning do not immediately restore perfusion (converting it to a pink hand or restoring the pulse), an open anterior approach is mandatory to explore the brachial artery. The artery may be entrapped in the fracture site, suffering from an intimal tear, or experiencing severe spasm. Release of the lacertus fibrosus, adventitial stripping, warming with saline, and application of topical papaverine are initial steps. If flow is not restored, intraoperative consultation with a vascular surgeon for potential saphenous vein grafting is required.

Surgical Technique and Intervention

Preoperative Preparation and Patient Positioning

The patient was taken to the operating room urgently. General anesthesia was induced, and prophylactic intravenous antibiotics (Cefazolin) were administered. Muscle relaxation is critical in these cases to overcome the intense spasm of the biceps, brachialis, and triceps, which significantly impedes reduction.

Patient positioning is paramount for successful fluoroscopic imaging and surgical access. The patient was positioned supine with the injured left arm extended on a radiolucent hand board. The C-arm image intensifier was brought in parallel to the operating table. This specific setup allows the surgeon to obtain orthogonal AP and lateral views by rotating the C-arm arc rather than rotating the highly unstable, injured extremity. Manipulating the arm for imaging prior to reduction risks further neurovascular injury and soft tissue stripping.

Closed Reduction Maneuvers

The closed reduction of a supracondylar humerus fracture is a multi-step, sequential maneuver designed to unlock the fracture fragments, correct coronal and axial alignment, and finally correct the sagittal deformity.

1. Traction: Longitudinal traction was applied to the forearm with the elbow in approximately 30 degrees of flexion. Counter-traction was provided by an assistant grasping the proximal humerus. This step disengages the proximal fragment from the brachialis muscle and restores length.
2. Coronal Translation and Rotation: While maintaining traction, the medial-lateral translation and rotational deformities were corrected. Given the posteromedial displacement, the distal fragment was translated laterally. The forearm was then fully pronated. Pronation is a critical maneuver for posteromedial displacement; it tightens the intact medial periosteal hinge, effectively closing the fracture book and locking the medial column. (Conversely, supination is used for posterolateral displacement to tension the lateral hinge).
3. Sagittal Reduction: With traction maintained, coronal alignment corrected, and the forearm pronated, the surgeon placed their thumb securely over the posterior aspect of the olecranon. The elbow was then smoothly hyperflexed while the thumb pushed the distal fragment anteriorly. The intact posterior periosteum acts as a tension band during hyperflexion, compressing the fracture site.

Intraoperative Fluoroscopic Assessment

Following the reduction maneuver, the elbow was held in hyperflexion and pronation. The C-arm was utilized to assess the reduction.
* Lateral View: The lateral view was obtained by rotating the C-arm 90 degrees. This view confirmed the restoration of the anterior humeral line, which now perfectly intersected the middle third of the capitellum. The posterior fat pad was still present but the bony alignment was anatomic.
* AP View (Jones View): Obtaining a true AP view of the distal humerus while the elbow is hyperflexed is achieved via the Jones view, where the beam is directed through the flexed forearm. This view confirmed the restoration of Baumann's angle to 75 degrees and the reconstitution of the medial and lateral columns. The teardrop was intact.

Percutaneous Pinning Strategy and Execution

With anatomic reduction confirmed and held securely, percutaneous pinning was initiated. Smooth Kirschner wires (K-wires), typically 1.6mm or 2.0mm depending on patient size, are utilized. For this 6-year-old, 1.6mm pins were selected.

Lateral Pin Placement:
The lateral pin is always placed first to establish initial stability. The starting point is the center of the lateral epicondyle. The pin is driven directly across the fracture site, aiming to engage the medial cortex of the proximal fragment. The trajectory is typically 40 to 45 degrees to the shaft in the coronal plane and slightly posterior-to-anterior in the sagittal plane to account for the normal anterior angulation of the distal humerus. Fluoroscopy confirmed excellent purchase in both the distal fragment and the proximal medial cortex.

Medial Pin Placement and Ulnar Nerve Protection:
Placing the medial pin requires absolute precision to avoid the ulnar nerve. The elbow, which was hyperflexed for reduction, must be extended to approximately 60 to 70 degrees. This extension allows the ulnar nerve to subluxate posteriorly, moving it away from the medial epicondyle.

To further minimize risk, a "mini-open" technique was employed. A small 1cm incision was made directly over the medial epicondyle. Blunt dissection using a hemostat was performed down to the bone, sweeping soft tissues and the ulnar nerve posteriorly. A soft tissue protector (drill sleeve) was placed directly onto the bony apex of the medial epicondyle. The K-wire was then introduced through the sleeve and driven across the fracture site, aiming for the lateral cortex of the proximal fragment. The pins crossed above the olecranon fossa, maximizing biomechanical stability.

Open Reduction Indications and Approaches

While closed reduction was successful in this case, the surgeon must always be prepared to convert to an open reduction. Indications for open reduction include:
* Inability to achieve an acceptable closed reduction (often due to brachialis muscle interposition or periosteal entrapment).
* A white, pulseless hand that does not improve after closed reduction.
* An open fracture requiring irrigation and debridement.

If open reduction is required for an irreducible fracture, an anterior approach (via a transverse crease incision or an S-shaped incision) is generally preferred as it allows direct visualization of the neurovascular bundle and the anterior soft tissue interposition. Medial or lateral approaches can also be used depending on the specific location of the block to reduction.

Post Operative Protocol and Rehabilitation

Immediate Postoperative Care and Immobilization

Following successful pinning, the pins were bent, cut outside the skin, and capped to prevent migration and facilitate easy removal in the clinic. Leaving pins outside the skin is standard practice in pediatric supracondylar fractures, as it avoids a second anesthetic for removal, and the risk of deep pin tract infection is exceptionally low when managed properly.

Sterile dressings were applied around the pin sites. The arm was immobilized in a custom-molded, bivalved fiberglass long-arm cast. The elbow was positioned in approximately 70 to 80 degrees of flexion. Immobilizing the elbow in greater than 90 degrees of flexion is strictly avoided, as it significantly increases the pressure within the antecubital fossa, elevating the risk of vascular compromise and compartment syndrome. The forearm was maintained in neutral rotation.

The patient was admitted overnight for continuous neurovascular monitoring and pain management. Elevation of the limb on pillows was strictly enforced to aid in edema reduction. By the following morning, the patient's pain was well-controlled on oral analgesics, capillary refill was brisk (under 2 seconds), and the hand remained warm and pink. The patient was discharged with detailed instructions for the parents regarding cast care, signs of compartment syndrome (increasing pain out of proportion, pain with passive stretch of the fingers), and pin site hygiene.

Pin Removal and Outpatient Follow Up

The patient was seen in the outpatient orthopedic clinic at one week post-op for a wound check and radiographic evaluation. Radiographs confirmed maintenance of the anatomic reduction with no evidence of pin migration or loss of fixation.

At four weeks post-injury, the patient returned for definitive implant removal. Clinical examination revealed no tenderness over the fracture site, and radiographs demonstrated early bridging callus formation across the medial and lateral columns, indicating clinical union. The cast was removed, and the K-wires were extracted in the clinic setting without the need for local anesthesia or sedation. The pin sites were dressed with simple adhesive bandages.

Long Term Rehabilitation and Functional Recovery

A unique and highly beneficial aspect of pediatric elbow trauma is the capacity for spontaneous functional recovery. Unlike adults, children rarely require formal physical therapy following a supracondylar humerus fracture. In fact, aggressive passive stretching by a physical therapist is contraindicated, as it can incite heterotopic ossification (myositis ossificans) and paradoxically lead to severe joint stiffness.

The patient and parents were instructed to allow the child to use the arm for activities of daily living as tolerated. Active range of motion exercises, guided by the child's own pain tolerance, were encouraged. Swimming and light play were permitted, while high-impact activities, contact sports, and playground equipment (like the monkey bars that caused the injury) were restricted for an additional four to six weeks to allow for complete bone remodeling.

At the three-month follow-up, the patient had regained full, symmetric range of motion in flexion, extension, pronation, and supination. There was no clinical evidence of cubitus varus deformity, and the carrying angle was symmetric to the contralateral uninjured side. A final set of radiographs confirmed complete, robust remodeling of the distal humerus.

Management of Complications

While this case progressed flawlessly, the surgeon must be vigilant for potential complications.
* Cubitus Varus (Gunstock Deformity): This is the most common late complication, resulting from a malreduction in the coronal plane (failure to restore Baumann's angle) or an unrecognized internal rotation deformity. While primarily a cosmetic issue that does not typically impair function, severe cases may require a corrective lateral closing-wedge osteotomy later in childhood.
* Pin Tract Infection: Superficial erythema around the pins is common and usually resolves with oral antibiotics (e.g., Cephalexin) and local wound care. Deep infections requiring early pin removal and surgical debridement are rare.
* Nerve Palsy: If a nerve palsy is noted postoperatively that was not present preoperatively, it must be addressed. An isolated anterior interosseous nerve (AIN) palsy can typically be observed, as it is usually a stretch injury that resolves spontaneously over 3 to 6 months. However, a new-onset ulnar nerve palsy following medial pin placement strongly suggests iatrogenic tethering or penetration. This requires immediate return to the operating room for pin removal, exploration of the nerve, and repositioning of the fixation.

Clinical Pearls and Pitfalls

High Yield Surgical Pearls

• The Medial Hinge Dictates Rotation: Always assess the direction of displacement on the AP radiograph. Posteromedial displacement means the medial hinge is intact; use pronation during reduction to lock the fracture. Posterolateral displacement means the lateral hinge is intact; use supination.
• The Mini-Open Medial Approach is Mandatory: Never place a medial pin percutaneously. The ulnar nerve is highly mobile and easily injured. Always use a small incision, blunt dissection to the epicondyle, and a protective sleeve.
• Extend the Elbow for Medial Pinning: Hyperflexion subluxates the ulnar nerve anteriorly over the epicondyle. Extending the elbow to 60 degrees allows the nerve to fall back into the cubital tunnel, safely out of the trajectory of the medial pin.
• Maximize Pin Separation: If utilizing a lateral-only pin construct, ensure the pins are widely divergent at the fracture site to maximize torsional stability. Parallel pins placed close together offer poor biomechanical resistance to rotation.

Common Pitfalls to Avoid

• Accepting Malrotation: A fracture that appears perfectly reduced on the lateral view but has a rotational mismatch will inevitably collapse into cubitus varus. Always scrutinize the AP (Jones) view to ensure the width of the proximal and distal fragments perfectly match.
• Immobilizing in Extreme Flexion: Never cast a supracondylar fracture in more than 90 degrees of flexion, regardless of how stable the fracture feels in that position. The risk of vascular compromise and compartment syndrome in the swollen pediatric elbow is unacceptably high.
• Forcing a Closed Reduction: If the fracture is irreducible after two or three gentle, controlled attempts, stop. Repeated aggressive manipulations strip the remaining periosteum, increase swelling, and damage the articular cartilage. Convert to an open reduction to address the soft tissue block.
• Ignoring the White Hand: A white, pulseless hand that remains white after anatomic reduction is a vascular emergency. Do not send the patient to the recovery room hoping for spasm to resolve. Immediate anterior exploration is required.