Operative Management of Hand Fractures and Dislocations: A Comprehensive Guide

Comprehensive Introduction and Patho-Epidemiology

The human hand represents an intricate biomechanical marvel, an evolutionary masterpiece relying on a delicate, unforgiving equilibrium between skeletal architecture, capsuloligamentous constraints, and the dynamic forces of the extrinsic and intrinsic musculature. The operative management of hand fractures and dislocations is not a mere exercise in carpentry; it demands meticulous precision, profound anatomical knowledge, and a deep respect for the soft tissue envelope. The primary objective of surgical intervention extends far beyond the achievement of radiographic union. The ultimate goal is the complete restoration of functional kinematics and a frictionless gliding mechanism. Prolonged or inappropriate immobilization inevitably leads to capsular contracture, catastrophic tendon adhesion, and devastating digital stiffness, which often proves more debilitating than the initial osseous injury. Therefore, the contemporary paradigm in orthopedic hand surgery emphatically champions anatomic reduction, rigid internal fixation, and immediate postoperative mobilization.

Epidemiologically, hand and digit fractures account for approximately 20% of all fractures presenting to emergency departments, representing a massive burden on both the healthcare system and the economic productivity of the working-age population. The highest incidence is observed in young males, typically secondary to occupational hazards, athletic trauma, or interpersonal violence. Metacarpal fractures constitute roughly 40% of all hand fractures, with the fifth metacarpal neck (the ubiquitous "boxer's fracture") being the most frequently encountered isolated injury. Phalangeal fractures, while slightly less common, present a disproportionately higher risk of functional impairment due to the intimate proximity of the osseous structures to the flexor and extensor mechanisms.

The pathophysiological cascade following hand trauma is characterized by profound local edema, hematoma formation, and an aggressive fibroblastic response. The dorsal skin of the hand is exceptionally thin and highly mobile, accommodating the full arc of digital flexion. However, this lack of subcutaneous fat renders the extensor tendons and underlying periosteum highly vulnerable to direct trauma, ischemic necrosis, and iatrogenic injury during surgical approaches. Conversely, the volar aspect is characterized by thick, glabrous skin tethered by robust fascial septa, designed to withstand immense compressive loads during grip but complicating surgical exposure.

This definitive masterclass synthesizes decades of foundational literature—ranging from Stener’s seminal work on thumb ligamentous injuries to Eaton’s advancements in volar plate arthroplasty and Foucher's minimally invasive osteosynthesis techniques. It is designed as an exhaustive, step-by-step surgical guide for the practicing orthopedic surgeon, fellow, and resident, providing the requisite knowledge to navigate the treacherous waters of complex hand trauma, minimize iatrogenic morbidity, and reliably restore the functional capacity of the human hand.

Detailed Surgical Anatomy and Biomechanics

Osteology and Articular Geometry

The skeletal framework of the hand comprises 19 tubular bones (5 metacarpals and 14 phalanges), each functioning within a highly specific kinematic chain. The metacarpophalangeal (MCP) joints are condyloid joints allowing flexion, extension, abduction, adduction, and limited circumduction. A critical biomechanical feature of the metacarpal head is its asymmetric, cam-shaped geometry. In the sagittal plane, the metacarpal head is wider volarly than dorsally. Consequently, the collateral ligaments are relatively lax in extension (allowing abduction/adduction) but become maximally taut in 70 to 90 degrees of flexion. This cam effect dictates the fundamental rule of hand immobilization: to prevent collateral ligament contracture, the MCP joints must always be splinted in deep flexion (the "intrinsic-plus" position).

The proximal interphalangeal (PIP) and distal interphalangeal (DIP) joints are true bicondylar hinge joints, permitting only flexion and extension. The articular congruity of the PIP joint is meticulously maintained by the tongue-in-groove articulation of the proximal phalangeal head and the middle phalangeal base. The volar plate of the PIP joint is a robust fibrocartilaginous structure that prevents hyperextension; its proximal membranous attachments (the check-rein ligaments) are a frequent site of post-traumatic contracture if the digit is immobilized in flexion.

Capsuloligamentous Constraints

The stability of the digital joints is governed by a complex, three-dimensional capsuloligamentous box. The collateral ligaments of the MCP and IP joints consist of two distinct components: the proper collateral ligament (PCL) and the accessory collateral ligament (ACL). The PCL originates from the dorsal-lateral aspect of the condyle and inserts onto the volar-lateral base of the adjacent phalanx, providing primary restraint against varus/valgus stress. The ACL lies volarly, originating from the same complex but inserting directly into the lateral margins of the volar plate. This dual-ligament system ensures that the volar plate remains dynamically tensioned against the articular surface throughout the arc of motion, preventing capsular interposition during reduction maneuvers.

The Extrinsic and Intrinsic Musculature

The dynamic balance of the digit is orchestrated by the interplay between the extrinsic tendons (originating in the forearm) and the intrinsic muscles (originating within the hand). The flexor digitorum profundus (FDP) and flexor digitorum superficialis (FDS) traverse the fibro-osseous digital pulleys (A1 through A5, and crucial cruciform pulleys). Any fracture resulting in a volar prominence or requiring bulky volar hardware will inevitably abrade these tendons, leading to rupture or dense adhesions within zone II (the "no man's land" of Bunnell). Dorsally, the extensor mechanism is a delicate, millimeter-thick aponeurotic expansion. The central slip inserts on the base of the middle phalanx, while the lateral bands converge to form the terminal tendon at the distal phalanx. Fractures of the phalanges frequently disrupt this delicate balance, leading to predictable deformities such as the boutonnière (central slip disruption) or swan neck (volar plate laxity combined with intrinsic tightness) deformities.

Vascular Supply and Soft Tissue Envelope

The vascular supply to the digits is provided by the proper palmar digital arteries, which travel volarly alongside the digital nerves. A critical anatomical consideration during phalangeal osteosynthesis is the blood supply to the flexor tendons, which is delivered via the vincula longa and brevia. Disruption of these delicate vascular tethers during aggressive volar dissection can lead to tendon ischemia and subsequent rupture. The venous and lymphatic drainage of the hand is predominantly dorsal; hence, post-traumatic edema accumulates on the dorsum of the hand, forcing the MCP joints into extension and the IP joints into flexion (the "intrinsic-minus" or claw position). This predictable resting posture is the antithesis of the safe position and must be aggressively counteracted through splinting and elevation.

Exhaustive Indications and Contraindications

The decision to proceed with operative osteosynthesis in the hand requires a nuanced understanding of fracture morphology, patient demands, and the inherent risks of surgical trauma. While many metacarpal and phalangeal fractures are amenable to closed reduction and functional bracing, specific morphological characteristics dictate an absolute requirement for surgical stabilization. The threshold for intervention is significantly lower in the hand compared to the long bones, as even minute angular or rotational deformities are dramatically magnified at the fingertip.

A classic example is rotational malalignment. A seemingly trivial 5-degree rotational deformity at the level of the metacarpal shaft will translate to a 1.5-centimeter overlap (scissoring) at the fingertips during composite flexion, severely compromising grip strength and fine motor dexterity. Similarly, intra-articular fractures with a step-off exceeding 1 to 2 millimeters require anatomical reduction to prevent rapid-onset post-traumatic osteoarthritis.

Pre-Operative Planning, Templating, and Patient Positioning

Imaging and Digital Templating

Meticulous preoperative planning begins with orthogonal radiographic imaging. A standard hand series (Posteroanterior, True Lateral, and Oblique) is mandatory. The true lateral view of the individual digit is often obscured by adjacent rays; therefore, a dedicated true lateral of the affected finger must be specifically requested. For intra-articular fractures of the metacarpal head, the Brewerton view (MCP joints flexed to 65 degrees, X-ray beam angled 15 degrees ulnar-to-radial) is invaluable for visualizing collateral ligament avulsion fractures.

In the setting of complex intra-articular comminution (e.g., Rolando fractures, pilon fractures of the middle phalanx), a fine-cut computed tomography (CT) scan with three-dimensional reconstructions is strongly advocated. Digital templating is utilized to measure the exact dimensions of the fracture fragments, allowing the surgeon to select the appropriate implant system (e.g., 1.2 mm vs. 1.5 mm lag screws, 2.0 mm mini-condylar plates). Given the diminutive size of phalangeal fragments, the surgeon must calculate whether a fragment is large enough to accommodate a screw without catastrophic iatrogenic fragmentation (the rule of threes: the fragment must be at least three times the diameter of the screw core).

Patient Positioning and Anesthesia

The advent of Wide Awake Local Anesthesia No Tourniquet (WALANT) has revolutionized hand surgery. By utilizing a mixture of lidocaine, epinephrine (for hemostasis), and sodium bicarbonate (to buffer the acidic sting), the surgeon can perform complex osteosynthesis without the need for a pneumatic tourniquet or general anesthesia. The profound advantage of WALANT is the ability to assess active tendon gliding and dynamic fracture stability intraoperatively. The patient is asked to actively flex and extend the digit after fixation, allowing the surgeon to immediately identify and address hardware impingement, tendon tethering, or inadequate reduction.

If general anesthesia or a regional brachial plexus block is utilized, the patient is positioned supine with the operative extremity extended onto a radiolucent hand table. A pneumatic upper arm tourniquet is applied over generous cast padding. Exsanguination is achieved with an Esmarch bandage, and the tourniquet is inflated to 250 mmHg (or 100 mmHg above systolic pressure). Tourniquet time must be strictly monitored, with a maximum continuous inflation time of 120 minutes to prevent ischemic neuropraxia and severe reperfusion injury. The C-arm fluoroscopy unit is positioned either parallel to the table or entering from the head of the bed, ensuring unimpeded access for the surgeon and assistant.

Step-by-Step Surgical Approach and Fixation Technique

Ulnar Collateral Ligament (UCL) Rupture (Gamekeeper’s / Skier’s Thumb)

The thumb accounts for approximately 40% of overall hand function. Its unique carpometacarpal (CMC) and metacarpophalangeal (MCP) joint anatomy allows for circumduction, opposition, and powerful pinch grips. Acute rupture of the UCL of the thumb MCP joint typically results from a forced hyperabduction mechanism. While partial tears (sprains) may be managed with functional splinting, complete ruptures frequently require operative repair due to the interposition of the adductor aponeurosis—the classic Stener lesion—which mechanically prevents spontaneous ligamentous healing.

Surgical Technique: UCL Repair
1. Approach: A lazy-S or chevron incision is made over the ulnar aspect of the thumb MCP joint, avoiding straight longitudinal incisions that cross flexion creases to prevent scar contracture.
2. Dissection: The sensory branches of the superficial radial nerve are meticulously identified using loupe magnification and retracted dorsally. The adductor aponeurosis is exposed.
3. Identifying the Lesion: The proximal edge of the adductor aponeurosis is incised longitudinally. In the presence of a Stener lesion, the ruptured UCL is found folded back upon itself, superficial to the aponeurosis.
4. Preparation: The joint is inspected for osteochondral fragments. If a small avulsion fracture is present but too small for screw fixation, it is excised. The anatomic footprint of the UCL at the volar-ulnar base of the proximal phalanx is debrided to bleeding cancellous bone using a small curette or burr to promote biological healing.
5. Anchor Placement: A micro-suture anchor (1.3 mm to 2.0 mm, titanium or biocomposite) is inserted into the prepared footprint. The trajectory must be carefully controlled to avoid intra-articular penetration.
6. Ligament Reattachment: The high-tensile sutures are passed through the robust distal stump of the UCL using a locking Krackow or Mason-Allen configuration to prevent pull-through. The knot is tied with the MCP joint held in 30 degrees of flexion and slight ulnar deviation, effectively eliminating tension on the repair.
7. Closure: The adductor aponeurosis is repaired over the ligament, restoring the dynamic stabilizing function of the adductor pollicis, and the skin is closed with non-absorbable monofilament.

Base of Thumb Fractures (Bennett and Rolando Fractures)

Fractures of the base of the first metacarpal are inherently unstable due to the deforming forces of the abductor pollicis longus (APL), which pulls the metacarpal shaft proximally, dorsally, and radially. Conversely, the anterior oblique ligament (AOL) firmly retains the volar-ulnar beak fragment in its anatomic position attached to the trapezium.

Bennett Fracture-Dislocation
A Bennett fracture is a two-part intra-articular fracture. Closed reduction and percutaneous pinning (CRPP) remains the gold standard for fragments too small for rigid screw fixation.
1. Reduction Maneuver: The surgeon applies longitudinal traction, palmar abduction, and pronation to the thumb metacarpal. Simultaneously, direct firm pressure is applied over the dorsal-radial metacarpal base to counteract the APL.
2. Fixation: Under fluoroscopic guidance, two 0.045-inch Kirschner wires (K-wires) are driven percutaneously. The first wire secures the first metacarpal shaft directly to the trapezium. A second supplementary wire is often driven from the first metacarpal into the second metacarpal base to maintain the first web space and neutralize deforming forces.

Rolando Fracture
A Rolando fracture is a three-part (Y- or T-shaped) or highly comminuted intra-articular fracture at the first metacarpal base.
1. Approach: A Wagner incision is utilized along the glabrous border of the thenar eminence, carefully protecting the palmar cutaneous branch of the median nerve.
2. Fixation: For fracture patterns with large, distinct fragments, open reduction and internal fixation (ORIF) with a 2.0 mm mini-T-plate or condylar plate is meticulously applied. In cases of severe, non-reconstructable comminution, dynamic external fixation or distraction pinning is employed. This relies on the principle of ligamentotaxis to maintain length and joint congruity while the fracture consolidates.

Metacarpal Shaft and Neck Fractures

Metacarpal fractures are ubiquitous. While conservative management is appropriate for many, surgical intervention is mandated for open fractures, multiple concurrent metacarpal fractures, intra-articular extension, rotational deformity, and unacceptable angular deformity.

Bouquet Osteosynthesis for Metacarpal Neck Fractures
Popularized by Foucher, the "bouquet" technique utilizes multiple flexible intramedullary K-wires to stabilize metacarpal neck fractures without violating the delicate dorsal extensor mechanism or the fracture hematoma.
1. Entry Portal: A 1-centimeter incision is made at the anatomical base of the affected metacarpal. The dorsal cortex is breached with a sharp awl or drill, taking care to avoid the CMC joint space.
2. Wire Preparation: Two or three 0.8 mm or 1.0 mm K-wires are selected. The distal 5 millimeters of each wire is slightly bent to allow for directional steering within the medullary canal.
3. Reduction and Fixation: The fracture is reduced using the Jahss maneuver: the MCP and PIP joints are flexed to 90 degrees, and upward pressure is applied along the axis of the proximal phalanx to push the metacarpal head dorsally. The wires are advanced antegrade across the fracture site and into the subchondral bone of the metacarpal head. By rotating the wires, the bent tips diverge like a bouquet of flowers, providing excellent rotational and multi-planar stability.

Plate Fixation for Metacarpal Shaft Fractures
For transverse or short oblique shaft fractures requiring absolute stability, dorsal plating provides rigid fixation that permits immediate active range of motion.
1. Approach: A longitudinal dorsal incision is made. The superficial veins are preserved where possible. The extensor tendon is split longitudinally (tendon-splitting approach) or retracted radially/ulnarly.
2. Fixation: A 2.0 mm or 2.4 mm low-profile titanium plate is applied. The principles of absolute stability dictate that at least three cortices (preferably four) of fixation are required both proximal and distal to the fracture line. Lag screws may be placed independently or through the plate for oblique patterns.
3. Soft Tissue Handling: The paratenon must be meticulously preserved and repaired over the plate. Failure to interpose this gliding layer inevitably results in dense extensor tendon adhesions, the most common and frustrating complication of dorsal metacarpal plating.

Phalangeal Fractures

Phalangeal fractures are notoriously unforgiving. The volumetric constraints of the digit mean that even minor hardware prominence, slight malreduction, or excessive surgical trauma will result in severe, often irreversible stiffness.

1. Transverse Fractures: Frequently amenable to closed reduction and longitudinal intramedullary K-wire fixation or crossed K-wires. If ORIF is chosen, a mid-axial approach is preferred to avoid the dorsal extensor apparatus.
2. Spiral/Oblique Fractures: These are best managed with multiple 1.2 mm or 1.5 mm lag screws placed perpendicular to the fracture plane. The glide hole is drilled in the near cortex, the thread hole in the far cortex, and the screw is countersunk to minimize profile. A minimum of two screws is required to control rotational forces.
3. Comminuted Fractures: Bridging osteosynthesis using mini-condylar plates or dynamic external fixators is utilized to bypass the zone of injury, preserving the fracture hematoma and maintaining length.

Complex Metacarpophalangeal and Proximal Interphalangeal Dislocations

Irreducible MCP Dislocations
Dorsal dislocation of the MCP joint most commonly affects the index or small fingers. It becomes "irreducible" (a complex dislocation) when the volar plate avulses from its proximal membranous attachment and becomes interposed between the metacarpal head and the base of the proximal phalanx. Attempting closed reduction with longitudinal traction is a catastrophic error; it merely tightens the noose of the intrinsic tendons and lumbricals around the metacarpal neck, further entrapping the volar plate.
* The Dorsal Approach (Becton et al.): While historically a volar approach (Kaplan) was advocated, the radial digital nerve is frequently tented over the prominent metacarpal head and is at extreme risk of iatrogenic transection. A dorsal longitudinal incision is vastly preferred. The extensor tendon is split longitudinally. The interposed volar plate is visualized directly over the articular surface of the proximal phalanx. The plate is longitudinally incised, which releases the tension, allowing the metacarpal head to easily slip back into the joint space.

PIP Joint Fracture-Dislocations
The PIP joint is a hinge joint critical for digital flexion. Dorsal fracture-dislocations involve the volar base of the middle phalanx. Management is strictly dictated by the percentage of the articular surface involved.
* <30% Articular Involvement: Generally stable after closed reduction. Managed with dorsal block splinting, allowing active flexion but preventing terminal extension.
* 30% to 50% Articular Involvement: Often highly unstable. Managed with dynamic external fixation (e.g., the Suzuki frame). This construct utilizes K-wires and rubber bands to maintain concentric reduction through ligamentotaxis while allowing immediate active motion, effectively molding the healing articular surface.
* >50% Articular Involvement: Requires structural reconstruction.
* Volar Plate Arthroplasty (Eaton-Malerich): The volar plate is advanced into the osseous defect and secured with pull-out sutures over a dorsal button to resurface the joint.
* Hemi-Hamate Autograft: For severe, chronic defects, an osteochondral graft is harvested from the dorsal-distal articular surface of the hamate (which anatomically matches the contour of the volar base of the middle phalanx) and secured with multiple 1.0 mm or 1.2 mm lag screws.

Mallet Finger Deformities

A mallet finger results from the disruption of the terminal extensor tendon at the distal interphalangeal (DIP) joint, either via a tendinous rupture (Zone I) or an avulsion fracture of the dorsal base of the distal phalanx. The vast majority of tendinous mallet fingers, and even those with small bony avulsions, are successfully treated with continuous, uninterrupted DIP joint extension splinting (e.g., Stack splint) for 6 to 8 weeks.

Operative Intervention for Mallet Fractures
Surgical intervention is strictly indicated for mallet fractures involving >30% of the articular surface, or those associated with volar subluxation of the distal phalanx.
1. Extension Block Pinning (Ishiguro Technique): A 0.045-inch K-wire is driven percutaneously into the distal phalanx just dorsal to the fracture fragment to act as a rigid buttress. The DIP joint is then reduced into full extension, utilizing the intact terminal tendon to pull the fragment into place. A second K-wire is driven transarticularly across the DIP joint to hold the reduction.
2. Open Reduction and Internal Fixation (ORIF): For large, non-comminuted fragments, a dorsal H-incision or Y-incision is utilized. The fragment is directly reduced and fixed using a 1.0 mm lag screw, a low-profile hook plate, or tension band wiring. The dorsal skin over the DIP joint is exceptionally thin and relies on a fragile microvascular network. Aggressive retraction or bulky hardware frequently leads to dorsal skin necrosis, hardware exposure, and disastrous deep infection.

Complications, Incidence Rates, and Salvage Management

The operative management of hand fractures carries a unique and unforgiving complication profile. Unlike long bone fractures where nonunion is a primary concern, the overwhelming nemesis of hand osteosynthesis is stiffness. The intricate gliding layers of the digit are exquisitely sensitive to edema, surgical trauma, and hardware prominence.

Phased Post-Operative Rehabilitation Protocols

The ultimate success of hand fracture osteosynthesis is inextricably linked to the postoperative rehabilitation protocol. The most flawless surgical execution will result in a dismal functional outcome if not paired with expert therapy. The orthopedic surgeon and the certified hand therapist (CHT) must work in absolute lockstep, communicating the stability of the fixation and the specific tissues at risk.

Phase I: Acute Post-Operative Period (0 to 2 Weeks)

The primary objectives in the acute phase are the control of edema, protection of the surgical repair, and the prevention of intrinsic contracture. Edema control is critical; massive swelling acts as a biological glue, tethering the delicate fascial planes. Elevation, compressive wrapping (e.g., Coban), and active range of motion (AROM) of all uninvolved joints (shoulder, elbow, wrist) are initiated immediately. For rigidly fixed fractures, early active motion protocols are instituted within 3 to 5 days to promote differential tendon gliding. If splinting is required, the hand must be placed in the safe "intrinsic-plus" position: wrist extended 20-30 degrees, MCP joints flexed 70-90 degrees, and IP joints fully extended.

Phase II: Intermediate Healing Phase (2 to 6 Weeks)

As the fibroblastic phase of healing progresses, clinical stability improves. Static splints are progressively transitioned to dynamic or static progressive orthoses depending on the specific injury pattern and any developing contractures. Passive range of motion (PROM) is cautiously introduced, guided by the patient's pain tolerance and the surgeon's assessment of radiographic callus. "Place and hold" exercises and synergistic wrist motion (tenodesis exercises) are heavily utilized to maximize tendon excursion while minimizing stress on the healing fracture.

Phase III: Remodeling and Strengthening (6 to 12 Weeks)

Once definitive radiographic union is confirmed (typically bridging trabeculae visible on multiple views), aggressive strengthening exercises are initiated. Work hardening and sport-specific drills are incorporated. Joint mobilization techniques, including sustained low-load stretching, are employed to address any residual capsular contractures. The patient must understand that final functional recovery and scar maturation may take up to