Metacarpal Fractures 2

Modern Study Review (AI-Generated)

High-Yield Summary

Metacarpal fractures are common hand injuries that require precise assessment of angulation, rotation, and shortening to optimize functional outcomes. Spiral/oblique fractures tend to shorten and rotate rather than angulate, with the border metacarpals (2nd and 5th) more prone to shortening due to less ligamentous tethering. Modern management balances non-operative treatment for stable, well-aligned fractures with operative fixation for unstable or malrotated fractures, prioritizing restoration of pain-free motion and grip strength.

Key Diagnostic Findings

Aspect	Details
Anatomy	2nd and 3rd metacarpals are more stable due to deep transverse metacarpal ligament and interossei; 4th and 5th are more mobile.
Clinical Presentation	Pain, swelling, deformity, rotational deformity (notably magnified distally), and limited finger motion.
Imaging	Standard AP, lateral, and oblique hand X-rays; fluoroscopy intraoperatively to assess reduction quality.
Classification Systems	No universally accepted classification for metacarpal base fractures; spiral/oblique fractures characterized by shortening and rotation rather than angulation.

Current Gold Standard Treatment

Fracture Type	Non-Operative Indications	Operative Indications	Preferred Techniques
Spiral/Oblique Fractures	Acceptable angulation, correct rotation, <5 mm shortening	Unacceptable angulation/rotation, impingement on flexion	Open reduction internal fixation (ORIF) with K-wires, plates, AO lag screws, cerclage wires; K-wire fixation to adjacent metacarpal if needed.
Comminuted Fractures	Rarely non-operative due to instability	Usually require combined internal and external fixation with delayed bone grafting	External fixator plus internal fixation as needed.
Metacarpal Base Fractures	Stable fractures with no rotational deformity	Rotational deformity or instability	Cast or splint immobilization; surgery rarely needed.

– Immobilization: Volar or dorsal slab with MCP joints flexed at 60-70° for stable fractures.

Modern Preference: Open reduction is favored over closed reduction due to difficulty confirming reduction quality intraoperatively with fluoroscopy.

Modern Complications & Outcomes

Complication	Clinical Relevance	Prevention/Management
Soft tissue injury	Common; includes extensor tendon damage and interossei injury	Careful surgical technique; early mobilization to prevent adhesions.
Rotational deformity	Leads to finger overlap and impaired grip/function	Accurate reduction and fixation; rotational alignment is critical.
Intrinsic contracture	Due to scarring of interossei and soft tissues	Early therapy and splinting; surgical release if severe.
Nonunion or malunion	Rare with appropriate fixation	Adequate fixation and bone grafting in comminuted fractures.
Stiffness	Common if immobilization prolonged or soft tissue injury severe	Early controlled motion protocols post-fixation.

– Outcome Focus: Restoration of painless motion, grip strength, and prevention of rotational deformity are paramount for functional recovery.

Classic Clinical Notes

Metacarpal #’s cont.

They prefer open reduction because it is difficult to determine the quality of the closed reduction on image intensifier in the OR.

Spiral/Oblique Fractures

Tend to shorten and rotate rather than angulate.
The 3rd and 4th shorten less because of the tethering of the deep transverse metacarpal ligament and the interossei. Shortening is more pronounced in the border 2nd and 5th metacarpals.

Treatment

If, after closed reduction, the angulation is acceptable, the rotation is correct, and there is less than 5 mm of shortening, treat with a volar/dorsal slab with the MCP’s held in about 60-70° of flexion.
If not acceptable, or if the spiral tip appears that it might impinge on proximal phalangeal flexion, ORIF with K-wires, plates, AO lag screws, cerclage wires. Consider K-wiring to an adjacent metacarpal. They prefer open reduction because it is difficult to determine the quality of the closed reduction on image intensifier in the OR.

Comminuted Fractures

Frequently need a combination of internal and external fixation, with delayed primary bone grafting.

Metacarpal Base Fractures

Usually stable injuries, requiring little more than a cast or splint immobilization.
Note that ANY rotational deformity is greatly magnified at the tip.
Neither Rockwood and Green nor Jupiter indicate what unacceptable alignment would be. Probably best again to remember that the 2nd and 3rd are stable and move very little, while the 4th and 5th are more mobile and thus tolerate deformity better.

Complications

Note that soft tissue damage is common. Concomitant extensor tendon damage is common, with adhesions being likely.
The interossei may be damaged, and scarring may lead to intrinsic contractures of the hand.

Last Updated on January 24, 2026 by orthonet