How should a finger be immobilized after suturing?

Finger Immobilization Post-Suturing

Immobilize the finger in the "intrinsic-plus" or "safe" position—with the metacarpophalangeal (MCP) joints flexed at 70-90 degrees and the interphalangeal (IP) joints in full extension—to prevent joint stiffness and ligament contracture while protecting the repair.

Position of Immobilization

The traditional "functional position" (slight flexion of all joints) should be avoided for finger immobilization as it leads to joint stiffness through capsular and ligament shrinkage 1. Instead:

• MCP joints: Flex to 70-90 degrees
• PIP and DIP joints: Maintain in full extension (0 degrees)
• This "intrinsic-plus" or "protective position" keeps collateral ligaments under maximum tension, minimizing immobilization damage 1

Type-Specific Considerations

For Extensor Tendon Injuries (Terminal Tendon/Mallet Finger)

• Immobilize only the DIP and PIP joints—these are the only joints affecting terminal tendon excursion 2
• Keep the DIP joint in full extension or slight hyperextension
• Even 1mm of tendon lengthening causes ~25 degrees of extension lag; 4mm causes >60 degrees of flexion deformity 2
• Multiple immobilization options are acceptable: stack splint, thermoplastic orthosis, or aluminum splint all show similar outcomes, though stack splints may preserve grip strength better 3

For Flexor Tendon Repairs

• Modern strong repair techniques (six-strand core sutures) allow immediate active mobilization without immobilization between therapy sessions 4
• If immobilization is needed, use the intrinsic-plus position to protect collateral ligaments

For Fractures

• Immobilize only until the fracture is stable with motion—often immediately possible 5
• Never immobilize longer than one month to prevent permanent stiffness 5
• Use the intrinsic-plus position during immobilization

Common Pitfalls to Avoid

• Don't immobilize in the "functional position" with all joints slightly flexed—this causes preventable stiffness
• Don't over-immobilize: Prolonged immobilization beyond 3-4 weeks causes irreversible joint contractures
• Don't immobilize unnecessary joints: For DIP injuries, immobilizing the wrist or MCP joints adds no benefit and increases morbidity 2
• Don't underestimate the importance of position: Even small deviations in joint positioning during healing can result in significant functional deficits

Practical Implementation

Use a dorsal or volar splint that maintains the intrinsic-plus position, typically:

• Aluminum foam-padded splints (easily moldable)
• Thermoplastic custom splints
• Stack splints for isolated DIP injuries

The splint should be well-padded, allow for swelling, and be checked within 24-48 hours to ensure proper positioning is maintained.