Comprehensive Clinical Guide: Open Reduction and Internal Fixation (ORIF) of Proximal Humerus Fractures

Proximal humerus fractures represent a significant challenge in orthopedic trauma, particularly in the aging population where bone quality is frequently compromised by osteoporosis. As the third most common fracture in patients over the age of 65, the management of these injuries requires a nuanced understanding of anatomy, biomechanics, and the specific surgical techniques associated with Open Reduction and Internal Fixation (ORIF).

ORIF remains the gold standard for displaced, unstable proximal humerus fractures where the goal is to preserve the humeral head and restore functional anatomy. This guide serves as a clinical reference for orthopedic surgeons, residents, and clinical staff involved in the perioperative management of these complex injuries.

1. Introduction & Overview

The proximal humerus is a complex anatomical region comprising the humeral head, the greater tuberosity, the lesser tuberosity, and the surgical neck. Fractures here are classified most commonly using the Neer classification system, which focuses on the displacement of the four major segments.

ORIF is a surgical intervention designed to realign bone fragments into their anatomical position (reduction) and secure them using hardware such as locking plates, screws, and sutures (fixation). Unlike hemiarthroplasty or reverse total shoulder arthroplasty (RTSA), ORIF aims to keep the patient’s native bone, which is often preferred in younger patients or when bone stock is sufficient to support hardware.

2. Technical Specifications & Mechanisms

The primary mechanism of ORIF involves achieving a "stable construct" that allows for early mobilization. The advent of locking plate technology has revolutionized the management of these fractures.

Biomechanical Principles

• Fixed-Angle Stability: Locking screws create a fixed-angle construct between the screw head and the plate, which is essential in osteoporotic bone where traditional non-locking screws would lose purchase.
• Tension Banding: Often, non-absorbable sutures are passed through the rotator cuff tendons (supraspinatus, infraspinatus, subscapularis) and tied through the plate to reduce tuberosity fragments and neutralize the pull of the rotator cuff muscles.
• Calcar Support: The medial calcar is the primary weight-bearing pillar of the proximal humerus. Failure to restore medial column support is the most common cause of varus collapse and fixation failure.

Hardware Selection

3. Clinical Indications & Usage

Not every proximal humerus fracture requires surgery. The decision to proceed with ORIF is guided by patient physiological age, bone quality, fracture pattern, and functional demands.

Indications for ORIF

• Displacement: Greater than 1 cm or angulation greater than 45 degrees.
• Tuberosity Fractures: Displaced greater than 5 mm, as these are critical for rotator cuff function.
• Valgus Impacted Fractures: Specifically in younger patients where preserving the humeral head is critical.
• Younger, Active Patients: Where biological reconstruction is superior to prosthetic replacement.

Contraindications

• Severe Comminution: Where the humeral head is shattered (head-split) and lacks vascularity.
• Poor Bone Quality: Extremely low bone mineral density (BMD) where hardware will likely fail.
• Advanced Age/Comorbidities: Patients with limited life expectancy or those unable to participate in intensive physical therapy.
• Active Infection: Absolute contraindication for internal hardware.

4. Pre-Operative Preparation

Success in ORIF begins before the skin incision. Proper planning minimizes operative time and reduces the risk of complications.

1. Imaging: High-resolution CT scan with 3D reconstruction is mandatory to evaluate the degree of comminution, the position of the tuberosities, and the presence of medial column impaction.
2. Medical Optimization: Smoking cessation, glycemic control in diabetics, and bone density management (e.g., assessing the need for post-op bisphosphonates).
3. Patient Positioning: Typically, the Beach Chair position is utilized. This allows for easy access to the shoulder and the ability to intraoperatively manipulate the arm to check stability.
4. Antibiotic Prophylaxis: Standard weight-based dosing of first-generation cephalosporins 30–60 minutes prior to incision.

5. The Procedure: Step-by-Step

Step 1: Surgical Approach

The Deltopectoral approach is the workhorse for proximal humerus ORIF. It utilizes the interval between the deltoid and the pectoralis major, protecting the cephalic vein.

Step 2: Fracture Exposure

The fracture site is identified. The rotator cuff tendons are tagged with heavy non-absorbable sutures to facilitate manipulation of the tuberosities.

Step 3: Reduction

The humeral head is reduced to the shaft. If the head is in varus, it must be "valgus-reduced" to restore the anatomical neck-shaft angle (typically 130–140 degrees).

Step 4: Plate Application

The locking plate is positioned distal to the greater tuberosity (usually 5–10 mm) to avoid impingement on the acromion. The plate is secured to the shaft first, then the head screws are inserted.

Step 5: Tuberosity Fixation

The tagged tuberosities are brought into position and secured to the plate through the eyelets. This "tension band" effect is vital for long-term functional success.

Step 6: Closure

Layered closure is performed, ensuring the deltopectoral interval is approximated.

6. Post-Operative Recovery Protocol

The recovery phase is divided into stages to protect the fixation while preventing adhesive capsulitis (frozen shoulder).

• Phase I (Weeks 0–2): Immobilization in a sling. Pendulum exercises only.
• Phase II (Weeks 2–6): Passive range of motion (PROM). No active lifting. Focus on scapular stabilization.
• Phase III (Weeks 6–12): Active-assisted ROM (AAROM). Strengthening begins only after radiographic evidence of callous formation.
• Phase IV (3–6 Months): Progressive resistance training and return to full function.

7. Risks and Potential Complications

Despite meticulous technique, complications can occur:
* Avascular Necrosis (AVN): Occurs if the blood supply to the humeral head is disrupted during the injury or surgery.
* Screw Cut-out: Hardware protruding through the articular surface, usually due to poor screw placement or varus collapse.
* Non-union/Malunion: Failure of the bone to heal in the correct position.
* Adhesive Capsulitis: Common if early motion is too restricted.
* Hardware Impingement: If the plate is placed too high, it will strike the acromion during abduction.

8. Alternative Treatments

When ORIF is not appropriate, surgeons consider:
1. Non-operative Management: For minimally displaced fractures. Early physical therapy leads to good outcomes.
2. Hemiarthroplasty: Replacing the humeral head with a metal prosthesis. Used for head-split fractures.
3. Reverse Total Shoulder Arthroplasty (RTSA): Increasingly common for complex fractures in elderly patients with poor bone quality or large tuberosity comminution.

9. Massive FAQ Section

Q1: How long does the surgery take?
Typically 90 to 150 minutes, depending on the complexity of the fracture and the surgeon's experience.

Q2: Will I need physical therapy?
Yes, physical therapy is mandatory for a successful outcome. It usually starts within the first 2 weeks.

Q3: Can I sleep flat in bed after surgery?
Most patients prefer sleeping in a semi-reclined position (using pillows) for the first 4–6 weeks to reduce discomfort.

Q4: What is the most common reason for ORIF failure?
Failure to restore the medial calcar support, leading to varus collapse of the humeral head.

Q5: Will I have permanent hardware?
Usually, yes. Unless the hardware causes impingement or pain, it is left in place permanently.

Q6: What is the success rate of ORIF?
The majority of patients achieve good to excellent functional outcomes, though some degree of stiffness is common.

Q7: When can I return to driving?
Driving is generally prohibited until the patient is out of the sling and has sufficient range of motion to control the vehicle safely, usually at 6–8 weeks.

Q8: What if I have osteoporosis?
Surgeons may use "bone graft substitutes" or specialized locking screws to improve purchase in osteoporotic bone.

Q9: How do I know if the bone is healing?
Serial X-rays are taken at 2, 6, and 12 weeks to monitor callous formation and hardware position.

Q10: What are the warning signs of a complication?
Increased redness, drainage from the incision, sudden sharp pain, or inability to move the arm after previously improving are signs to contact your surgeon immediately.

10. Conclusion

ORIF for proximal humerus fractures is a sophisticated intervention that demands precision. By adhering to the principles of anatomical reduction, stable internal fixation, and a structured rehabilitation protocol, surgeons can provide patients with an excellent chance of restoring shoulder function. As technology evolves, the focus continues to shift toward biological augmentation and minimally invasive techniques, further improving the landscape for geriatric orthopedic care.

Disclaimer: This guide is intended for educational purposes for healthcare professionals and patients. It does not replace the clinical judgment of a board-certified orthopedic surgeon. Always consult with your medical team for specific surgical advice.