Patient must maintain strict NPO status for at least 8 hours. Perform pre-anesthetic clearance including ECG and blood work (CBC, Coagulation profile). Verify fracture imaging with 3D CT scan. Administer prophylactic intravenous antibiotics 30 minutes prior to incision. Obtain informed consent and mark the operative site.
Patient remains admitted for 2 days for pain management and neurovascular monitoring. Immobilization in a posterior splint for 7-10 days followed by early controlled passive range of motion exercises. Elevate the affected limb to reduce edema. Suture removal at 14 days. Physical therapy commences at 2 weeks post-op. Strict avoidance of heavy lifting for 6-8 weeks.
Comprehensive Guide: Open Reduction and Internal Fixation (ORIF) for Radial Head Fractures
1. Introduction and Clinical Overview
The radial head is a critical stabilizer of the elbow joint, acting as a secondary restraint to valgus stress and a primary stabilizer against longitudinal forearm instability. Fractures of the radial head are among the most common elbow injuries, often resulting from a fall onto an outstretched hand (FOOSH). While many non-displaced or minimally displaced fractures can be managed conservatively, complex, comminuted, or displaced fractures often necessitate surgical intervention.
Open Reduction and Internal Fixation (ORIF) is the gold-standard surgical procedure aimed at restoring the anatomical alignment of the radial head, preserving the radiocapitellar joint, and facilitating early range of motion (ROM). This guide explores the intricate clinical landscape of ORIF for radial head fractures, providing an exhaustive reference for clinicians, surgical residents, and allied health professionals.
2. Anatomy and Biomechanics
The radial head is a disc-shaped structure that articulates with the capitellum of the humerus and the radial notch of the ulna. Its unique shape allows for rotational movement (pronation and supination) while maintaining stability.
- The "Safe Zone": A crucial anatomical consideration during ORIF is the "safe zone." This is an arc of approximately 90° of the radial head that does not articulate with the radial notch of the ulna during rotation. Surgical hardware (screws, plates) must be placed within this zone to avoid impingement during forearm rotation.
- Ligamentous Support: The radial head is integral to the Lateral Ulnar Collateral Ligament (LUCL) complex. Disruption of the radial head can lead to posterolateral rotatory instability (PLRI) of the elbow.
3. Clinical Indications and Usage
Surgical intervention is not required for all fractures. The Mason-Johnston classification system is typically employed to determine the necessity of ORIF.
Indications for ORIF:
| Classification | Description | Clinical Action |
|---|---|---|
| Mason Type I | Non-displaced | Conservative (sling/early motion) |
| Mason Type II | Displaced (>2mm) | ORIF if motion is blocked |
| Mason Type III | Comminuted/Displaced | ORIF (if reconstructible) or Arthroplasty |
| Mason Type IV | Associated with Elbow Dislocation | Urgent ORIF/Stabilization |
Specific Indications for Surgical Intervention:
- Mechanical Block: A physical obstruction to pronation or supination caused by displaced fracture fragments.
- Incongruity: Intra-articular steps >2mm.
- Associated Injuries: Presence of "Terrible Triad" (Radial head fracture, coronoid fracture, and elbow dislocation) or interosseous membrane injury (Essex-Lopresti lesion).
- Valgus Instability: Failure of the elbow to maintain structural integrity under stress.
4. Patient Pre-Operative Preparation
Success in ORIF begins with meticulous pre-operative planning.
- Imaging: High-resolution CT scans are mandatory for complex fractures to delineate the number of fragments and the size of the articular surface involvement.
- Soft Tissue Assessment: Evaluation of the skin envelope is critical. If significant swelling or fracture blisters are present, surgery may be delayed (3–7 days) to prevent wound dehiscence.
- Informed Consent: Patients must be counseled on the risks of post-traumatic arthritis, stiffness (arthrofibrosis), and the potential need for secondary procedures (e.g., hardware removal or arthrolysis).
5. Detailed Procedure: ORIF Technique
The surgery is typically performed under general or regional anesthesia with the patient in the supine or lateral decubitus position.
Surgical Steps:
- Approach: The Kocher interval (between the anconeus and the extensor carpi ulnaris) is the standard approach. It provides excellent visualization of the radial head while protecting the posterior interosseous nerve (PIN).
- Exposure: The annular ligament is incised or reflected. Retractors must be used with caution to avoid PIN injury.
- Reduction: The articular fragments are reduced anatomically. K-wires (Kirschner wires) are often used to hold the fragments in place temporarily.
- Fixation:
- Low-profile plates: Specifically designed pre-contoured radial head plates are used.
- Screws: Headless compression screws (Herbert screws) are ideal for intra-articular fractures as they sit buried beneath the cartilage, minimizing hardware prominence.
- Assessment: The surgeon verifies the "safe zone" by rotating the forearm through full pronation and supination to ensure the hardware does not impinge on the sigmoid notch.
- Closure: The annular ligament is repaired if possible, and the fascia and skin are closed in layers.
6. Post-Operative Recovery Protocol
Early motion is the cornerstone of a successful recovery to prevent permanent elbow stiffness.
- Phase I (0–2 weeks): Immobilization in a splint or hinged brace. Gentle active-assisted range of motion (AAROM) may begin early if fixation is stable.
- Phase II (2–6 weeks): Weaning from the splint. Initiation of active ROM exercises. Heavy lifting and pushing/pulling are strictly prohibited.
- Phase III (6–12 weeks): Strengthening exercises. Focus on regaining full terminal extension and flexion.
- Phase IV (3+ months): Return to full occupational and athletic activities, provided radiographic union is confirmed.
7. Complications and Risks
Despite the high success rate, ORIF is not without risks:
* Post-Traumatic Stiffness: The most common complication, often requiring intensive physical therapy or surgical release.
* Hardware Prominence/Impingement: If the plate is not perfectly contoured, it may interfere with the proximal radioulnar joint.
* PIN Palsy: Transient neuropraxia or permanent injury to the posterior interosseous nerve.
* Non-union/Malunion: Failure of the bone to heal or healing in an incorrect position.
* Heterotopic Ossification: Abnormal bone formation in the soft tissues around the joint.
8. Alternative Treatments
- Non-Operative Management: Indicated for Type I fractures or patients with low functional demand.
- Radial Head Excision: Historically performed but largely abandoned due to the risk of proximal radial migration and subsequent wrist pain (distal radioulnar joint instability).
- Radial Head Arthroplasty (RHA): Indicated for highly comminuted fractures (Mason III/IV) where the radial head cannot be reconstructed. A metallic or pyrocarbon implant replaces the native head.
9. FAQ: Frequently Asked Questions
Q1: How long does the surgery take?
Typically 60 to 120 minutes, depending on the complexity of the fragmentation.
Q2: Will I need physical therapy?
Yes, physical therapy is essential to prevent stiffness and ensure a successful outcome.
Q3: Can I return to sports?
Most patients can return to non-contact sports within 3–4 months. Contact sports may require 6 months or more.
Q4: What if the bone doesn't heal?
Non-union is rare but may require bone grafting or revision surgery.
Q5: Is hardware removal common?
Hardware removal is only performed if it causes pain, impingement, or skin irritation.
Q6: What is the "Terrible Triad"?
It is a severe elbow injury consisting of a radial head fracture, a coronoid fracture, and an elbow dislocation. It requires specialized surgical management.
Q7: Will I have a scar?
Yes, a surgical incision is required on the lateral aspect of the elbow, which will leave a linear scar.
Q8: When can I drive?
Usually, once the patient is out of a splint and has regained sufficient strength and control of the limb, typically 4–6 weeks post-op.
Q9: Does smoking affect recovery?
Yes, nicotine significantly impairs bone healing and increases the risk of complications.
Q10: What is the success rate of ORIF?
The majority of patients achieve good to excellent functional outcomes, though minor loss of terminal extension is common.
10. Conclusion
ORIF of the radial head is a sophisticated procedure that balances structural restoration with the preservation of elbow kinematics. By adhering to strict anatomical principles—specifically the identification of the "safe zone" and the use of low-profile hardware—surgeons can effectively manage complex fractures. With dedicated post-operative rehabilitation, patients can expect a high likelihood of functional recovery, returning to their daily activities with minimal long-term impairment. For clinicians, the key remains patient selection, precise operative execution, and a proactive approach to preventing post-operative stiffness.