Your Complete Guide to the Anterior Volar Approach to the Forearm

Introduction & Epidemiology

The anterior volar approach, commonly referred to as the Henry approach, is a foundational surgical exposure in orthopedic trauma and reconstructive surgery of the forearm. First described by Arnold Henry, this approach provides comprehensive access to the anterior aspect of the radius, the interosseous membrane, and, with appropriate modifications, the ulna. It is indispensable for managing a wide array of pathologies, primarily diaphyseal forearm fractures, distal radius fractures requiring volar plating, and select soft tissue conditions such as tumor excisions or nerve decompressions.

Forearm fractures, particularly diaphyseal radius and ulna fractures, represent a significant proportion of musculoskeletal trauma. They are frequently high-energy injuries, often involving both bones (Monteggia and Galeazzi fracture-dislocations), and require precise anatomical reduction and rigid internal fixation to restore forearm rotation and length. The incidence of forearm fractures varies with age, peaking in bimodal distributions for pediatric and elderly populations. In adults, isolated radius or ulna fractures are less common than combined fractures. Distal radius fractures are among the most common fractures overall, and the volar approach has become the standard for addressing displaced or unstable patterns requiring plate fixation, owing to its biomechanical advantages and ability to restore volar tilt.

The primary objective of surgical intervention for forearm fractures is to achieve stable fixation that permits early mobilization, thereby minimizing the risk of nonunion, malunion, and contracture, and optimizing functional outcomes. The anterior volar approach, with its predictable internervous planes and extensibility, remains a cornerstone technique for achieving these goals.

Surgical Anatomy & Biomechanics

A thorough understanding of forearm anatomy is paramount for safe and effective utilization of the anterior volar approach. The forearm is a complex osteofascial compartment housing muscles, nerves, and vessels responsible for wrist, hand, and digit function, as well as forearm rotation.

Osseous Anatomy

• Radius: The lateral bone of the forearm, proximally articulating with the capitellum of the humerus and the radial notch of the ulna, and distally with the carpus and ulna (via the triangular fibrocartilage complex). Its diaphysis has a triangular cross-section, becoming more cylindrical distally.
• Ulna: The medial bone, proximally forming the primary articulation with the trochlea of the humerus and distally articulating with the radius. Its diaphysis is triangular proximally and round distally.
• Interosseous Membrane: A dense fibrous sheet connecting the medial border of the radius to the lateral border of the ulna along their shafts. It plays a critical role in stabilizing the forearm, transmitting axial load from the radius to the ulna, and serving as an origin for deep forearm muscles.

Muscular Anatomy & Compartments

The volar forearm is divided into superficial, intermediate, and deep compartments by fascial septae.

1. Superficial Layer (Primarily Median Nerve Innervated, except FCU):

   • Pronator Teres (PT): Originates from the medial epicondyle and coronoid process, inserts onto the lateral mid-radius. Pronates and flexes forearm.
   • Flexor Carpi Radialis (FCR): Originates from the medial epicondyle, inserts into the base of the second metacarpal. Flexes and radially deviates wrist.
   • Palmaris Longus (PL): Originates from the medial epicondyle, inserts into the palmar aponeurosis. Weak wrist flexor, often absent.
   • Flexor Carpi Ulnaris (FCU): Originates from the medial epicondyle and olecranon, inserts into the pisiform, hook of hamate, and base of the fifth metacarpal. Flexes and ulnar deviates wrist. Innervated by the ulnar nerve.

2. Intermediate Layer (Median Nerve Innervated):

   • Flexor Digitorum Superficialis (FDS): Originates from the medial epicondyle, coronoid process, and radial shaft. Divides into four tendons inserting into the middle phalanges of digits 2-5. Flexes PIP joints and wrist.

3. Deep Layer (Primarily Anterior Interosseous Nerve (AIN) Innervated, except medial FDP):

   • Flexor Digitorum Profundus (FDP): Originates from the ulna and interosseous membrane. Divides into four tendons inserting into the distal phalanges of digits 2-5. Flexes DIP joints and wrist. The medial two tendons (digits 4-5) are innervated by the ulnar nerve; the lateral two tendons (digits 2-3) are innervated by the AIN.
   • Flexor Pollicis Longus (FPL): Originates from the radius and interosseous membrane, inserts into the distal phalanx of the thumb. Flexes IP joint of the thumb. Innervated by the AIN.
   • Pronator Quadratus (PQ): Originates from the distal ulna, inserts onto the distal radius. Primary pronator of the forearm. Innervated by the AIN.

Neurovascular Structures

• Median Nerve: Courses through the forearm, initially deep to pronator teres, then between FDS and FDP, finally emerging superficial to FDS distally. It innervates most of the superficial and intermediate volar forearm muscles.
• Anterior Interosseous Nerve (AIN): A purely motor branch of the median nerve, typically arising just distal to the pronator teres. It courses on the interosseous membrane between FDP and FPL, innervating FDP (lateral half), FPL, and PQ. It is a critical structure to identify and protect.
• Radial Artery: Arises from the brachial artery in the cubital fossa, courses obliquely over the pronator teres, and then descends along the radial aspect of the forearm, between the brachioradialis and FCR.
• Ulnar Artery: Also arises from the brachial artery, courses deep to pronator teres, then deep to FDS, alongside the ulnar nerve.
• Ulnar Nerve: Enters the forearm deep to FCU, then runs between FCU and FDP, accompanying the ulnar artery.

Internervous Planes for the Henry Approach

The classic Henry approach exploits the internervous plane between muscles innervated by the radial nerve (primarily brachioradialis and extensor carpi radialis longus/brevis, though not directly in the volar exposure) and muscles innervated by the median nerve (pronator teres, FCR, FDS).

• Proximal Forearm: The interval is developed between the brachioradialis laterally (radial nerve innervation) and the pronator teres/FCR medially (median nerve innervation). The radial artery typically lies within this interval.
• Mid-Forearm: The interval shifts to between the FCR laterally and the FDS medially, or directly through the FDS belly. The median nerve and AIN must be carefully protected here, as they lie deep to FDS.
• Distal Forearm (for distal radius): The interval is between the FCR tendon (retracted medially) and the radial artery (retracted laterally). The FPL lies deep to this, with the PQ deep to FPL.

This detailed anatomical understanding allows for precise surgical dissection, minimizing iatrogenic injury to vital neurovascular structures and maximizing exposure to the target osseous structures. The biomechanical integrity of the forearm is heavily reliant on the precise length, rotation, and alignment of both radius and ulna, as well as the intact interosseous membrane, all of which are aims of fixation via this approach.

Indications & Contraindications

The anterior volar approach is versatile, offering access to the entire length of the radius, the interosseous membrane, and indirectly to the ulna. Its utility spans a broad range of orthopedic conditions.

Indications

• Radial Diaphyseal Fractures: Isolated or combined with ulnar fractures (both bone forearm fractures).
• Distal Radius Fractures: Unstable or displaced intra-articular and extra-articular fractures requiring volar plate fixation, particularly those with volar comminution, articular depression, or malalignment not amenable to closed reduction.
• Galeazzi Fracture-Dislocations: Fractures of the radial shaft with associated dislocation of the distal radioulnar joint (DRUJ).
• Nonunion or Malunion of Radial Fractures: For revision surgery, osteotomy, and bone grafting.
• Tumors of the Radius: Excision and reconstruction.
• Osteomyelitis of the Radius: Debridement and stabilization.
• Forearm Compartment Syndrome: Fasciotomy (though often combined with dorsal approaches).
• Neurovascular Pathology: Median nerve decompression (e.g., in crush injuries, though carpal tunnel release is a separate, more distal approach), repair of radial artery injury.
• Congenital Deformities: Correction of conditions like radial club hand.

Contraindications

Absolute contraindications are few, primarily related to patient factors or local wound conditions that preclude surgery. Relative contraindications guide decision-making based on risk-benefit analysis.

• Absolute Contraindications:
  • Active Infection: Cellulitis or osteomyelitis at the surgical site (relative if surgical debridement is the primary indication).
  • Severe Comorbidities: Patient unable to tolerate general or regional anesthesia.
• Relative Contraindications:
  • Severe Soft Tissue Compromise: Extensive open wounds, devitalized tissue, or severe burns that compromise primary wound closure or increase infection risk.
  • Significant Dorsal Pathology: Fractures or soft tissue issues predominantly on the dorsal aspect of the forearm (may necessitate a dorsal approach or combined approach).
  • Extreme Scarring/Previous Surgery: May distort anatomical planes and increase risk of iatrogenic injury.
  • Fractures Requiring Limited Exposure: In some simple, stable fractures, a percutaneous or minimally invasive approach might be considered, though this is less common for diaphyseal fractures.

Operative vs. Non-Operative Indications

The decision to proceed with surgical intervention using the anterior volar approach versus non-operative management is based on fracture stability, displacement, patient factors, and functional goals.

Pre-Operative Planning & Patient Positioning

Meticulous pre-operative planning and appropriate patient positioning are critical for a safe and efficient surgical procedure.

Pre-Operative Planning

1. Clinical Assessment:

   • Thorough history and physical examination, including neurovascular status, soft tissue assessment, and assessment of pre-existing comorbidities.
   • Documentation of any skin lesions, previous scars, or neurological deficits.

2. Imaging:

   • Standard Radiographs: Anteroposterior (AP) and lateral views of the entire forearm, including the elbow and wrist joints, are essential to characterize fracture patterns, comminution, and displacement.
   • Computed Tomography (CT) Scan: Indicated for complex intra-articular distal radius fractures, Monteggia/Galeazzi fracture-dislocations, or when assessing nonunions/malunions for surgical planning.
   • MRI: Rarely needed for acute trauma but may be useful for soft tissue lesions, tumors, or nerve pathology.

3. Implant Selection:

   • Based on fracture pattern, bone quality, and surgeon preference.
   • For radial shaft fractures, generally 3.5mm stainless steel or titanium locking compression plates (LCP) are preferred due to their angular stability and adaptability. Length of plate should allow for adequate screw purchase proximal and distal to the fracture.
   • For distal radius fractures, anatomical pre-contoured volar locking plates are standard.
   • Ensure availability of various plate lengths, screw types (locking, cortical), and associated instruments (drills, taps, depth gauges, bending irons, reduction clamps).

4. Surgical Consent:

   • Detailed discussion with the patient regarding the procedure, potential benefits, risks (including neurovascular injury, infection, nonunion, malunion, hardware complications), and post-operative expectations.

5. Anesthesia Consultation:

   • General anesthesia is typically employed, often supplemented with regional blocks (e.g., axillary block) for post-operative pain management.

6. Antibiotic Prophylaxis:

   • Administer intravenous prophylactic antibiotics (e.g., cefazolin) within 60 minutes prior to incision, as per institutional protocol.

Patient Positioning

1. Supine Position: The patient is placed supine on the operating table.
2. Arm Table: The affected arm is abducted approximately 90 degrees on a radiolucent hand table. This allows for full access to the forearm, elbow, and wrist, and facilitates intra-operative fluoroscopy without repositioning.
3. Tourniquet Application: A pneumatic tourniquet is applied to the upper arm. The arm is exsanguinated (e.g., with an Esmarch bandage) and the tourniquet is inflated to a pressure typically 100-150 mmHg above systolic blood pressure (or 250-300 mmHg total) to create a bloodless field, crucial for identifying delicate neurovascular structures.
4. Sterile Preparation and Drape: The arm is prepped circumferentially with an antiseptic solution (e.g., chlorhexidine or povidone-iodine) from the axilla to the fingertips, allowing for full range of motion of the hand and wrist during surgery, if required. Sterile draping isolates the operative field.
5. Surgeon and Assistant Positioning: The surgeon typically stands on the side of the affected limb, with the assistant opposite.

Detailed Surgical Approach / Technique

The anterior volar approach (Henry approach) for the radius is a versatile exposure that can be extended proximally or distally depending on the pathology. We will detail the general approach, highlighting variations for proximal, mid-shaft, and distal radius exposure.

1. Skin Incision

• General Incision: A longitudinal skin incision is made on the volar aspect of the forearm.
  • Proximal Radius: Begins just distal to the antecubital crease, curving slightly radially.
  • Mid-shaft Radius: Centered over the radial shaft, running in line with the FCR.
  • Distal Radius: Extends from the mid-forearm to the wrist crease, between the FCR tendon and the radial artery pulsation.
• Aesthetic Considerations: The incision typically follows Langer's lines or longitudinal skin creases to minimize scarring.
• Length: The incision should be generous enough to allow adequate exposure of the fracture or pathology, typically 10-15 cm for diaphyseal fractures.

2. Subcutaneous Dissection

• The incision is deepened through the subcutaneous fat using electrocautery.
• Superficial Nerves: Careful attention must be paid to protecting superficial neurovascular structures.
  • Lateral Antebrachial Cutaneous Nerve (LACN): A sensory branch of the musculocutaneous nerve, often crosses the antecubital fossa laterally. Injury results in numbness along the radial aspect of the forearm.
  • Palmar Cutaneous Branch of the Median Nerve: Arises from the median nerve proximal to the wrist and courses superficially. Injury results in numbness over the thenar eminence.
  • These nerves should be identified, if encountered, and carefully retracted or protected.

3. Fascial Incision and Identification of Internervous Plane

• The deep fascia of the forearm is incised longitudinally, typically in line with the skin incision.

• Internervous Plane - Proximal Forearm (Henry Approach):

  • Identify the brachioradialis muscle laterally and the pronator teres (PT) muscle medially.
  • The interval between the brachioradialis (radial nerve innervation) and the PT/FCR (median nerve innervation) is developed. This is the classic internervous plane for the Henry approach.
  • The radial artery typically lies within this interval, superficial to the PT, and must be carefully identified and protected. It is usually retracted with the brachioradialis laterally.
  • Pronator Teres Insertion: To gain access to the proximal radial shaft, the superficial head of the pronator teres may need to be carefully released from its insertion on the mid-lateral radius. This should be performed subperiosteally to protect the median nerve and its branches, which lie deep to the muscle belly.
  • Once the PT is mobilized, it is retracted medially along with the FCR and FDS. The radial artery is retracted laterally with the brachioradialis.

• Internervous Plane - Mid-Shaft Forearm:

  • The plane between the FCR (retracted medially) and the brachioradialis (retracted laterally) is continued.
  • The Flexor Digitorum Superficialis (FDS) lies deep to the FCR. The exposure can be carried between FCR and FDS, or sometimes by splitting the FDS muscle belly if necessary.
  • Median Nerve and Anterior Interosseous Nerve (AIN): This is a critical juncture. The median nerve lies deep to the FDS. The AIN branches off the median nerve and courses distally on the interosseous membrane, between the Flexor Digitorum Profundus (FDP) and Flexor Pollicis Longus (FPL) . These nerves must be meticulously identified and protected throughout the exposure. Usually, the median nerve and FDS are retracted medially.

  
  This image illustrates the deeper dissection layers of the volar forearm, highlighting the median nerve and its relationship to the FDS and FPL muscles. Careful identification and protection of these structures are paramount to avoid iatrogenic nerve injury during the anterior volar approach.

• Internervous Plane - Distal Forearm (for Distal Radius):

  • The incision typically runs between the FCR tendon (medial) and the radial artery (lateral).
  • The FCR tendon is identified and retracted medially, allowing access to the underlying structures.
  • The radial artery is identified and retracted laterally along with the brachioradialis.
  • The Flexor Pollicis Longus (FPL) muscle and tendon lie deep to the FCR. The Pronator Quadratus (PQ) muscle is the deepest structure, lying directly on the distal radius. The AIN is typically deep to the FPL and FDP muscles in this region, innervating the PQ.
  • The PQ is incised from its ulnar attachment and carefully elevated subperiosteally from the volar aspect of the distal radius. This muscle provides excellent protection for neurovascular structures and its repair helps restore biomechanics.

4. Exposure of the Radius

• Once the internervous plane is established, the muscles are carefully retracted. Self-retaining retractors can be used, but frequently repositioning is necessary to prevent excessive tension on neurovascular structures.
• The periosteum of the radius is incised longitudinally and elevated using a periosteal elevator. This exposes the bone for fracture reduction and plate application. Maintain subperiosteal dissection to protect blood supply to the bone.

5. Fracture Reduction and Fixation

• Indirect Reduction: For closed fractures, indirect reduction techniques are preferred to preserve the fracture hematoma and soft tissue attachments, which are vital for bone healing. This involves traction, manipulation, and careful use of reduction clamps (e.g., Verbrugge, pointed reduction clamps).
• Direct Reduction: In complex or significantly displaced fractures, direct visualization and reduction may be necessary. Bone clamps can be applied directly to the fracture fragments. Temporary fixation with K-wires may be used to hold reduction.

• Plate Application:

  • The chosen plate (e.g., LCP for diaphyseal fractures, pre-contoured volar plate for distal radius) is carefully contoured to the volar surface of the radius. Anatomical plates for the distal radius are pre-contoured and designed to restore volar tilt and articular congruity.
  • The plate is provisionally secured with K-wires or a single cortical screw.
  • For diaphyseal fractures, the principles of bridge plating or compression plating are applied. For bridge plating, screws are typically placed at the ends of the plate, leaving the immediate fracture zone untouched to preserve biology. For compression, eccentric drilling can be used with cortical screws.
  • For locking plates, locking screws are inserted, ensuring bicortical purchase for optimal stability, unless specified otherwise (e.g., unicortical in some pediatric applications or specific locking plate designs). Fluoroscopy is used to confirm screw length and position, especially when approaching the DRUJ or radiocapitellar joint.
  • Image Intensifier (Fluoroscopy): Essential throughout reduction and fixation to confirm alignment, rotation, and implant position in both AP and lateral planes. For forearm shaft fractures, comparison views of the uninjured forearm are invaluable for assessing length and rotation.

  
  This image depicts the typical placement of a volar locking plate for a distal radius fracture. Note the position relative to the watershed line and the angulation of screws to capture distal fragments. The careful dissection and retraction shown in the previous image are prerequisite to achieving this safe and effective fixation.

6. Assessment of Forearm Rotation

• Before definitive closure, evaluate forearm rotation (pronation and supination) to ensure no impingement or restriction due to malunion or hardware prominence.
• For combined radius and ulna fractures, it is essential to ensure both bones are anatomically reduced and fixed to restore the functional axis of forearm rotation.

7. Wound Closure

• Hemostasis: Ensure meticulous hemostasis.
• Irrigation: The wound is thoroughly irrigated with sterile saline.
• Periosteum: The incised periosteum can be loosely reapproximated, if possible, but is not strictly necessary for union.
• Pronator Quadratus (Distal Radius): If the PQ was elevated, it should be repaired to its origin on the ulna, which provides additional stability to the DRUJ and covers the plate.
• Deep Fascia: The deep fascia is closed with absorbable sutures (e.g., 2-0 Vicryl).
• Subcutaneous Tissue: Subcutaneous layers are closed to obliterate dead space (e.g., 3-0 Vicryl).
• Skin: Skin edges are reapproximated using staples or non-absorbable sutures (e.g., 3-0 or 4-0 nylon).
• Drain: A suction drain may be placed in cases of extensive dissection or significant hematoma formation, but is not routinely necessary.
• Dressing: A sterile dressing is applied, followed by a sugar-tong splint or volar splint to provide comfort and initial protection in a neutral position.

Complications & Management

Despite its reliability, the anterior volar approach to the forearm is associated with potential complications, reflecting the complex anatomy of the region. Vigilant intraoperative technique and comprehensive postoperative care are essential for minimizing their incidence and managing them effectively.

Common Complications and Management Strategies

General Principles of Complication Management

• Early Recognition: Prompt identification of complications is paramount. Detailed neurovascular examination pre- and post-operatively, careful wound assessment, and vigilant monitoring of patient symptoms are critical.
• Documentation: Meticulous documentation of neurovascular status, wound checks, and patient complaints.
• Interdisciplinary Approach: Collaboration with neurologists, vascular surgeons, infectious disease specialists, and hand therapists is often necessary for optimal management.
• Patient Education: Informing patients about potential complications and encouraging them to report new symptoms promptly.

Post-Operative Rehabilitation Protocols

Post-operative rehabilitation is integral to achieving optimal functional outcomes following the anterior volar approach to the forearm. The goal is to restore strength, range of motion, and function while protecting the surgical repair. Protocols vary based on fracture type, stability of fixation, and individual patient factors.

Immediate Post-Operative Phase (Days 0-14)

1. Immobilization:
   • Forearm Shaft Fractures: A sugar-tong splint or long arm cast (elbow 90°, forearm neutral rotation, wrist slightly extended) is typically applied for comfort and protection for 2-4 weeks. The splint prevents forearm rotation, which is critical for healing.
   • Distal Radius Fractures with Volar Plate: A volar splint or short arm cast in a neutral wrist position is common for 1-2 weeks. Some surgeons advocate for immediate, protected range of motion depending on plate stability and bone quality.
2. Pain Management: Opioids, NSAIDs, and regional nerve blocks (if performed) are utilized.
3. Elevation: Keep the extremity elevated above heart level to minimize swelling.
4. Digit Motion: Encourage immediate active range of motion (ROM) of the fingers and thumb to prevent stiffness and reduce swelling.
5. Shoulder/Elbow Motion: For forearm shaft fixation, encourage active shoulder and elbow ROM to prevent stiffness, provided the elbow is not immobilized by a long arm cast.

Early Mobilization Phase (Weeks 2-6)

1. Splint Removal (if applicable): If a cast or splint was used for initial immobilization, it is typically removed at 2-4 weeks, depending on radiographic healing and clinical stability.
2. Initiation of Protected ROM:
   • Forearm Rotation: Begin gentle, active-assisted and active pronation/supination. The focus is on regaining smooth, controlled motion. Passive stretching should be introduced cautiously and under guidance.
   • Wrist ROM: Progress from active-assisted to active flexion, extension, radial, and ulnar deviation.
   • Elbow ROM: Continue or initiate full active flexion/extension.
3. Hand Therapy: Referral to a certified hand therapist is highly recommended. They provide structured exercises, custom orthoses if needed, and progression guidance.
4. Scar Management: Begin scar massage and desensitization once the incision is healed to prevent adhesions.

Strengthening and Functional Phase (Weeks 6-12)

1. Radiographic Assessment: Repeat radiographs are typically taken at 6 weeks to assess early callus formation and fracture union.
2. Progression of ROM: Continue to work on achieving full, pain-free ROM in all planes.
3. Gentle Strengthening:
   • Grip Strength: Start with soft putty or stress ball exercises.
   • Forearm Muscles: Isometrics, then light resistance exercises for wrist flexion/extension, pronation/supination.
   • Avoid Lifting: Initially avoid lifting heavy objects or putting direct axial load through the forearm.
4. Functional Activities: Incorporate light activities of daily living (ADLs) that do not stress the healing fracture site.

Advanced Strengthening & Return to Activity (Weeks 12+)

1. Radiographic Union: Clinical and radiographic union are generally achieved by 3-4 months post-operatively for most forearm fractures.
2. Progressive Strengthening: Advance to moderate-to-heavy resistance exercises using free weights, resistance bands, and machines. Focus on sport-specific or work-specific activities.
3. Endurance and Proprioception: Incorporate exercises to improve endurance and joint position sense.
4. Return to Work/Sport: Gradual return to full work duties or sport-specific training.
   • Non-contact/Light Impact: Typically allowed around 4-6 months, once full strength and ROM are achieved.
   • Contact/High Impact: May require 6 months or more, and often requires specific clearance based on bone healing and functional assessment.
5. Hardware Removal: For some patients, particularly younger individuals or those experiencing hardware irritation, plate removal may be considered 12-18 months post-operatively, after documented bone healing.

Key Considerations:
* Individualized Protocols: Rehabilitation should be tailored to the individual patient's fracture, fixation stability, bone quality, compliance, and functional demands.
* Pain as a Guide: While some discomfort is expected, sharp or increasing pain should prompt re-evaluation.
* Compliance: Patient adherence to the rehabilitation program is paramount for optimal outcomes.

Summary of Key Literature / Guidelines

The anterior volar approach to the forearm and the principles of forearm fracture management are well-established in orthopedic literature, evolving with advancements in implant technology and understanding of fracture biology.

1. Anatomical Reduction and Stable Fixation:

   • The consensus in the literature, supported by numerous biomechanical studies and clinical series, emphasizes the critical importance of anatomical reduction and rigid internal fixation for diaphyseal forearm fractures. This is necessary to restore the complex kinematics of forearm rotation. Studies by Anderson et al. and retrospective reviews consistently show that malunion, particularly rotational malunion, is a primary cause of poor functional outcomes.
   • The use of dedicated locking plates has significantly improved outcomes by providing angular stability, especially in osteoporotic bone or comminuted fractures, allowing for earlier mobilization.

2. The Henry Approach as the Standard:

   • The anterior volar (Henry) approach remains the most frequently utilized and well-described approach for radial shaft fractures and distal radius volar plating. Its predictable internervous planes and extensibility are key advantages.
   • Variations exist, particularly for the proximal third of the radius where the posterior interosseous nerve (PIN) is at risk with dorsal approaches. The Henry approach provides superior access to the proximal and middle third of the radius with lower risk to the PIN, though the median nerve and AIN require meticulous protection.

3. Distal Radius Fracture Management:

   • Volar locking plate fixation for unstable and displaced distal radius fractures has become the gold standard, largely replacing dorsal plating or external fixation in many cases. The biomechanical advantage of volar plates in resisting dorsal collapse and restoring volar tilt is well-documented.
   • The "watershed line" concept described by Orbay and Touliatos emphasizes the importance of placing the distal edge of the plate proximal to the watershed line to minimize flexor tendon irritation and rupture, a recognized complication.

4. Complication Avoidance:

   • Neurovascular injury, particularly to the median nerve and its AIN branch, is a recognized risk. High-volume centers and experienced surgeons demonstrate lower complication rates. Surgical technique reviews highlight strategies for nerve protection, including meticulous dissection, proper retraction, and subperiosteal elevation of muscles.
   • Nonunion and malunion rates have decreased with improved plate designs and surgical techniques but remain significant complications that require careful patient selection, precise operative execution, and diligent follow-up. The role of biological adjuncts (e.g., bone graft) in challenging nonunions is also well-supported.

5. Rehabilitation Principles:

   • Early, protected range of motion is a cornerstone of modern forearm fracture rehabilitation. This principle, largely enabled by stable internal fixation, aims to prevent stiffness and facilitate functional recovery.
   • The timing and intensity of rehabilitation must be individualized, balancing the need for motion with protection of the healing fracture.

The orthopaedic literature provides a robust evidence base for the anterior volar approach as a safe and effective method for treating a wide range of forearm pathologies, with continuous refinement in surgical techniques and implant technologies. Adherence to established surgical principles, meticulous anatomical dissection, and a structured post-operative rehabilitation protocol are paramount for optimizing patient outcomes.