Summary of Metacarpal and Phalangeal Fractures
Metacarpal & Phalangeal Fractures: Student Study Guide
Introduction
Metacarpal fractures are common hand injuries that often require careful selection of fixation techniques when nonoperative care is insufficient. This guide focuses on the surgical and percutaneous fixation options for metacarpal shaft and selected peri‑articular fractures, explaining indications, technical steps, advantages, limitations, and practical tips for early mobilization and complication avoidance.
Definition: Metacarpal fixation techniques are surgical or percutaneous methods used to stabilize broken metacarpal bones to restore alignment, length, rotation, and allow early motion while promoting bone healing.
Overview of Fixation Principles
- Goals: restore alignment (length, rotation, angulation), provide stability for early motion, preserve tendon gliding and soft tissues, avoid further devascularization.
- Choose fixation based on fracture pattern (transverse, oblique, spiral, comminuted), soft tissue condition, bone loss, patient size and functional demands.
Major Fixation Methods (High-level)
- Percutaneous Kirschner (K) pins and intramedullary pins
- Composite (tension band) wiring
- Interosseous or cerclage wiring
- Interfragmentary (lag) screws
- Plate and screw fixation (dorsal, lateral, low-profile microplates)
- External fixation
- Bioabsorbable implants
Percutaneous and Intramedullary Fixation
- Indications: simple transverse fractures, many closed shaft fractures where minimal invasion is desired.
- Techniques:
- Retrograde intramedullary pin: pin introduced from metacarpal head into shaft; can be backed out to avoid intra-articular retention.
- Antegrade intramedullary pin: from proximal fragment into distal fragment; larger Steinmann pins used historically.
- Multiple flexible pre-bent pins (0.8 mm) for three-point fixation provide rotational control.
- Advantages: minimal exposed hardware, can be done closed, permits early active motion.
- Limitations: less rotational stability for single longitudinal pins, risk of migration, distraction, and occasional nonunion in inappropriate patterns.
Tip: When using intramedullary pins, aim for three-point fixation for rotational control and bury or trim pins to avoid soft tissue irritation.
Kirschner Pin Configurations
- Configurations: single transverse, crossed pins, longitudinal intramedullary, combined.
- Use supplemental transverse pins for border digits or unstable patterns.
- Risks: pin loosening, migration, pin-track infection (reported complication rates up to ~18% in series), and potential distraction if improperly inserted.
Composite (Tension Band) Wiring
- Construct: K‑wires plus monofilament stainless steel wire (24–26 gauge) forming a tension band.
- Indications: transverse fractures without bone loss or comminution.
- Advantages: converts tensile forces into compression at fracture interface, rigid enough for early motion.
- Contraindications: bone loss, comminution, osteopenia.
Cerclage and Interosseous Wiring
- Cerclage (circumferential) wiring and interosseous loop wiring are useful for oblique and spiral fractures.
- Often used as supplement to K‑wires; isolated wiring can work in selected stable oblique fractures but carries risk of loosening if unsupported.
- Variations: 90–90 wiring for transverse fractures, interosseous loops for articular or comminuted fractures.
Interfragmentary (Lag) Screws
- Indication: long oblique or spiral fractures where compression across fracture achieves stability.
- Technical essentials (typical 2.7‑mm system for metacarpal shafts):
- Bicortical drilling with a pilot drill (e.g., 2.0 mm for a 2.7 mm screw).
- Countersinking to recess screw head.
- Depth measurement with gauge.
- Tapping (if non–self-tapping screw) with appropriate tap (e.g., 2.7 mm).
- Create gliding (near) hole by overdrilling near cortex (e.g., 2.7 mm).
- Insert screw ensuring engagement of far cortex to achieve lag compression.
- Key concepts: fracture length shoul
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Metacarpal Fixation Techniques
Klíčová slova: Phalangeal fractures types and anatomy, Metacarpal fractures: combined hand fractures, Metacarpal fractures: management, Metacarpal fractures: operative management, Metacarpal and Phalange Fractures, Phalangeal fractures fixation, Metacarpal fractures: fixation techniques, Metacarpal fractures: carpometacarpal injuries, Metacarpal fractures: complications and malunion, Hand fractures, PIP joint phalangeal fractures, Phalangeal fractures complications and treatment, Thumb metacarpal fractures and thumb injuries
Klíčové pojmy: Choose fixation based on fracture pattern, soft tissues, and patient needs, Intramedullary fixation suits transverse fractures; aim for three‑point fixation for rotation control, Single longitudinal K‑pin lacks rotational stability—use crossed or supplemental pins when needed, Interfragmentary lag screws are indicated for long oblique/spiral fractures and require fracture length ≥ twice bone diameter, Countersink and create a gliding near hole when performing lag screw fixation to achieve true compression, Low‑profile microplates reduce tendon adhesions but may be weaker and risk breakage, External fixation is indicated for severe open/comminuted fractures and preserves periosteal blood supply, Bioabsorbable implants avoid removal but earlier generations caused delayed inflammatory reactions, Plate fixation provides rigid stability but has higher risk of soft tissue complications when used with severe soft tissue injury, Always preserve periosteum and minimize soft tissue stripping to protect bone biology, Monitor and manage pin sites to reduce infection risk, Stop and redirect screws if resistance is felt to avoid fragment splaying