Case guide

UPDATED FEB 2026

Surgical Errors Malpractice

Part of the Medical Malpractice investigation

The short answer

Surgical errors — including wrong-site surgery, retained instruments, and nerve damage — are among the most egregious forms of medical malpractice. Many are classified as 'never events' by The Joint Commission because they should never occur in a properly functioning surgical environment.

When they do occur, liability is often clear and damages substantial.

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What Constitutes a Surgical Error?

Surgical errors fall into three broad categories: wrong-site, wrong-procedure, and wrong-patient events; technical errors during the procedure itself; and post-operative management failures. Wrong-site surgery — operating on the left knee instead of the right, removing the wrong kidney, or operating on the wrong patient entirely — occurs an estimated 40 times per week across U.S. hospitals despite mandatory surgical safety checklists. These events are indefensible and almost invariably result in significant settlements or verdicts.

Retained surgical instruments — sponges, clamps, retractors, and needles inadvertently left inside the patient after closure — cause abscesses, bowel perforation, chronic pain, and systemic infection. The standard of care requires meticulous instrument and sponge counts before and after every procedure. Modern technology including radiofrequency-tagged sponges and instrument tracking systems has reduced but not eliminated these events. When they occur, proof of negligence is straightforward.

Nerve Damage and Technical Surgical Errors

Nerve injuries during surgery range from temporary neuropraxia (nerve bruising that resolves) to permanent axonotmesis or neurotmesis (nerve crushing or severing). Common scenarios include facial nerve damage during parotid gland surgery, recurrent laryngeal nerve injury during thyroid surgery causing permanent voice loss, and common bile duct transection during laparoscopic cholecystectomy. Whether a nerve injury is malpractice depends on whether a competent surgeon operating with appropriate technique and anatomical knowledge would have caused the same injury. Expert testimony is essential to distinguish unavoidable complications from negligent technique.

Anesthesia Errors in Surgery

Anesthesia providers — anesthesiologists and certified registered nurse anesthetists (CRNAs) — must conduct a thorough pre-operative assessment, review all allergies and medications, administer appropriate dosages, monitor the patient continuously, and manage any complications promptly. Failures at any step can cause devastating harm. Anesthesia overdose can cause cardiac arrest. Failure to manage an allergic reaction (anaphylaxis) can lead to permanent brain damage. Anesthesia awareness — where a patient regains consciousness during surgery while paralyzed and unable to communicate — causes severe psychological trauma.

Key data

Data & Statistics

2 SOURCED FIGURES

An estimated 40 wrong-site surgeries occur every week in U.S. hospitals

The Joint Commission Sentinel Event Data

Retained surgical instruments cause serious harm in an estimated 1,500 cases per year

Agency for Healthcare Research and Quality (AHRQ)

FAQ

Frequently Asked Questions

12 QUESTIONS

Medical malpractice occurs when a healthcare provider — physician, surgeon, nurse, hospital, or other licensed provider — deviates from the accepted standard of care and that deviation causes preventable harm to a patient. The standard of care is defined as what a reasonably competent provider in the same specialty would have done under the same or similar circumstances. Malpractice is not simply a bad outcome — medicine involves inherent risks, and a patient can suffer a serious complication even with perfectly delivered care. To be malpractice, the provider must have acted negligently: doing something a competent provider would not have done, or failing to do something a competent provider would have done.

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The full investigation

Part of the Medical Malpractice Investigation