At What Time Interval After a Sharp Nerve Laceration Is Primary Nerve Repair No Longer Possible?

Area of Science:

• Orthopedic Surgery
• Neurosurgery
• Hand Surgery

Background:

• Sharp nerve injuries necessitate timely intervention to optimize functional recovery.
• The ideal timeframe for primary nerve repair versus nerve grafting after laceration is not well-defined.
• Understanding these time-sensitive parameters is crucial for surgical planning and patient outcomes.

Purpose of the Study:

• To determine the critical timeframes for primary nerve repair versus nerve grafting in sharp nerve lacerations.
• To analyze the influence of injury type and time to repair on the need for nerve grafting.

Main Methods:

• A retrospective analysis of 313 sharp nerve injuries in the hand and upper extremity (2016-2021).
• Data collected included time from injury to repair, nerve type (major, common digital, proper digital), need for grafting, graft length, patient age, and associated injuries.
• Statistical analysis was performed to identify predictors of grafting necessity.

Main Results:

• Time from injury to repair and the level of nerve injury were significant predictors for requiring nerve grafting.
• The odds of needing grafting increased with time for all nerve types, with a more pronounced effect on major nerves (OR 1.18) compared to digital nerves (OR 1.04-1.05).
• Age and associated injuries did not correlate with increased grafting rates.

Conclusions:

• Primary repair of major nerve injuries may be feasible only within a few days, potentially as short as two days post-injury.
• Primary repair of common and proper digital nerves can be considered for up to two weeks or longer after injury.
• These findings highlight distinct time windows for primary neurorrhaphy based on nerve location, guiding surgical management decisions.