Medical Malpractice

Surgical Error Lawyers in Ontario

Every operation carries risk, and a poor outcome is not automatically someone's fault. But some injuries are not the risk of the procedure — they are the result of care that fell below the accepted standard. When that happens, you deserve a legal team with the experience and resources to hold the responsible parties accountable.

$1B+Recovered in Gross Settlements Since 2013
35+Years of Experience
24/7Free Consultations Available
Looking for Legal Help?

Get Legal Help After a Surgical Error

Surgery concentrates a great deal into a short window. A team that has not confirmed the site, an instrument that is not accounted for, a bleed that is not recognised in recovery — each is a small failure with consequences that can be permanent.

The law does not treat a disappointing result as negligence. Recognised complications happen to careful surgeons, and consenting to a procedure means accepting its known risks. A claim arises when the surgical, anaesthetic, or post-operative care fell short of what a reasonably competent practitioner would have provided, and that failure caused an injury that would otherwise have been avoided.

The team of lawyers at Diamond and Diamond have experience handling surgical error claims across Ontario. Scheduling a consultation is the first step toward understanding your rights and determining the strength of your case.

Past results are not necessarily indicative of future results and the amount recovered and other litigation outcomes will vary according to the facts in individual cases.

Get Your Free Case Evaluation

Tell us what happened. We respond 24/7.

How It Works

Start with a Free Consultation

Past results are not necessarily indicative of future results and the amount recovered and other litigation outcomes will vary according to the facts in individual cases.

1

Start Your Claim

Fill out our simple form for a free case evaluation — getting started with Diamond & Diamond is quick and straightforward.

2

We Review Your Case

Our legal team reviews your operative records, imaging, and post-operative notes to assess whether the accepted standard of care was met.

3

We Advance Your Claim

If we take on your case, we pursue compensation for the harm caused by the surgical error.

Proven Track Record

Case Results

We've helped thousands of clients recover compensation across a wide range of personal injury cases.

$1.6 Million

Car Accident

An elderly woman was struck exiting her vehicle resulting in serious leg injuries. Our team obtained a settlement for $1.6 million.

$1.25 Million

Head-On Collision

Our client was involved in a head-on collision that broke both of her legs. Our car accident lawyers obtained a $1.25 million settlement.

$1.3 Million

Neck Fracture

A 21-year-old male was injured as a passenger in a motor vehicle accident, receiving a fractured neck. Settled prior to trial for $1.3 million.

$2.35 Million

Motorcycle Accident

Motorcycle accident — hit head-on by another vehicle travelling approximately 80 km/hr. Sustained multiple compound wrist and foot fractures.

Types of Claims

Where Surgical Care Goes Wrong

Surgical claims are not confined to the operating room. They arise across three phases, and the failure that causes the injury is often not the one that happened under the lights.

Before surgery, claims can involve inadequate assessment of a patient's fitness for the procedure, failure to review imaging or history, a site marked incorrectly, or a procedure carried out without valid consent. During surgery, they involve operating on the wrong site or the wrong patient, damage to organs, nerves, or blood vessels, and instruments or sponges left behind. After surgery, they involve failure to recognise bleeding, infection, or compartment syndrome, inadequate monitoring, and discharge before a patient is stable.

Some of these failures are severe enough to be treated as never events — incidents considered wholly preventable when established safeguards are followed. The Canadian Institute for Health Information tracks surgical site infections and procedure-associated conditions such as post-operative bleeding within CIHI's Hospital Harm indicator.

Where surgical care can go wrong
Common Allegations

Errors That Give Rise to Surgical Claims

Not every one of these situations supports a claim, and some can occur despite careful practice. What matters is whether recognised safeguards were followed and whether the injury was avoidable.

Several of these failures leave a clear documentary trail — counts, checklists, consent forms, timing entries — which is why complete operative records matter so much in assessing a surgical case.

Frequently raised in these claims

  • Wrong-site or wrong-side surgery
  • A procedure performed on the wrong patient
  • Surgical items left inside the body, including sponges, instruments, and guidewires
  • Unintended damage to organs, nerves, or blood vessels
  • Failure to recognise or respond to post-operative bleeding
  • Infection following lapses in sterile technique
  • Inadequate monitoring in recovery
  • Delayed response to compartment syndrome or blood clots
  • Discharge before the patient was stable
  • Poor handover between the surgical team and ward staff
  • A procedure carried out without valid consent
Did You Know?
"After surgery, request your complete operative record — including the surgical report, anaesthetic record, instrument counts, and post-operative notes. These documents will greatly assist your legal team in reviewing your case."
— Diamond & Diamond Lawyers
Compensation and damages in a surgical error claim
Compensation & Damages

Damages in a Surgical Error Claim

A surgical injury often means further surgery. Corrective procedures carry their own risks, recovery restarts, and what was planned as a short absence from work becomes months — or a permanent change in what a person is able to do.

Damages are designed to restore plaintiffs to their pre-injury financial positions. Income loss from the date of trial into the future is typically calculated based on previous earnings, employment history, and evidence regarding prospective earnings. Claims may also cover corrective and future surgery, rehabilitation, attendant care, home modifications, and out-of-pocket expenses.

Non-financial damages — such as pain and suffering — are more qualitative. Courts evaluate these based on previous case law that attributes a financial value to the impact of the injury or impairment on the patient's life. Family members may also have claims of their own for loss of care, guidance, and companionship.

Injured by a Surgical Error? Call Us Today.

Speak directly with our legal team. Free consultations available 24/7.

1-800-567-HURT
Free Case Evaluation
Your Legal Team

Working with Surgical Error Lawyers

Surgeons, anaesthesiologists, nurses, and hospitals each have a duty to provide care that meets the accepted standard. When that duty is breached and injury results, you need a legal team with the experience and resources to navigate the complexities of medical malpractice law.

The team of lawyers at Diamond and Diamond have experience handling surgical error claims and will work to protect your rights while providing you with clear, honest legal guidance throughout the process.

Avoid making contact with other parties involved in your case. Your lawyers from Diamond and Diamond should be your main point of contact in any medical malpractice matter. Contact our law firm now to discuss your case.

Working with surgical error lawyers
As the victim of an accident it’s a very frightening, bewildering and confusing time. You literally don’t know what you don’t know, so I’m sure that, at times, I must have bounced off a few walls and ceilings. In those moments I was courteously handled and never made to feel like i was too difficult or demanding a client.
The accident and aftermath was a very unpleasant experience overall and especially made so by police bias and their incompetent accident analysis; and the Mississauga city’s junction camera being out of operation June 2020 to January 2022 removed a critical piece of objective evidence. But with the collective assistance of Corey Sax and George Laloshi we persevered and resolved matters satisfactorily.
— Alan E, Google Review, Aug 9, 2023

Important Information About Surgical Errors Claims

The foundation of any medical malpractice claim rests on proving that the health care provider fell below the accepted standard of care. In a surgical claim, this means showing that a reasonably competent practitioner, faced with the same patient and the same circumstances, would have acted differently — whether in the decision to operate, the technique used, or the response to a complication.

Establishing this standard typically requires evidence from qualified medical professionals who can speak to what constitutes acceptable surgical practice. An experienced personal injury lawyer at Diamond and Diamond can help you navigate this process.

Standard of care in a surgical error claim

Every procedure carries recognised risks, and a complication that was properly disclosed and properly managed is generally not negligence. The distinction the law draws is between an outcome that can occur despite competent care and one that occurred because care fell short.

That distinction usually turns on the record: whether the risk was disclosed and consented to, whether recognised safeguards were followed, and how quickly the team responded once something went wrong.

Risk versus negligence in a surgical error claim

If you believe a surgical error caused your injury, request complete copies of your records — the consent form, operative report, anaesthetic record, nursing notes, instrument and sponge counts, and all post-operative documentation. Photograph any visible injury as it develops, and keep a written record of your symptoms and follow-up appointments.

Avoid discussing a potential claim with the providers involved in your care. Your next step should be to contact a personal injury lawyer with experience in medical malpractice cases, who can evaluate your situation during a free consultation.

What to do after a surgical error

Recent Articles

July 28, 2026

What Is Perinatal Asphyxia? Causes, Signs, and When a Birth Injury Raises Questions

The birth of a child should be one of life’s most hopeful moments. When a baby is deprived of oxygen around the time of delivery, families are left needing answers about what happened and why.

Read article →
July 23, 2026

Jeremy Syrtash in The Litigator: The Biased Expert at Trial

Publication: The Litigator, Winter 2023 edition. This feature examines the role of expert impartiality at trial and the problems that arise when expert evidence crosses that line.

Read article →
July 16, 2026

Diamond and Diamond Lawyers Recognized in Best Lawyers in Canada 2026

Two members of the Diamond and Diamond team earned recognition in the 2026 edition of Best Lawyers, reflecting peer acknowledgement within the legal profession.

Read article →

Frequently Asked Questions

Is a bad surgical outcome the same as a surgical error?
No. Surgery carries recognised risks, and a complication can occur even when the operation is performed competently. A claim requires showing that the care fell below the accepted standard and that this failure caused the injury — not simply that the result was disappointing.
What is a “never event” in surgery?
A never event is an incident considered wholly preventable when established safeguards are followed — operating on the wrong site or the wrong patient, or leaving a surgical item inside the body. Because recognised checks exist specifically to prevent them, these incidents raise questions about whether those checks were carried out.
Can I claim if an instrument or sponge was left inside me?
Retained surgical items are among the more straightforward surgical claims to establish, because counting protocols exist precisely to prevent them. A claim still needs to show the harm that followed — further surgery, infection, or ongoing symptoms.
Who can be held responsible for a surgical error?
Responsibility may rest with the surgeon, the anaesthesiologist, surgical or recovery nursing staff, or the hospital itself where staffing, equipment, or procedures contributed. More than one party is often involved, and identifying everyone who may be liable is part of assessing a claim.
What if I signed a consent form?
A consent form does not remove a provider's duty to perform the procedure competently. It records that you accepted the recognised risks of the operation — not that you accepted care falling below the standard. Consent also has to be genuinely informed to be valid.
The complication happened after I went home. Does that matter?
No. Post-operative care is part of the surgical episode. Claims regularly arise from failure to recognise bleeding or infection, inadequate discharge instructions, or discharge before a patient was stable.
What compensation may be available?
Depending on the case, compensation may cover corrective and future surgery, medical and rehabilitation expenses, lost income and loss of future earning capacity, attendant care, home and vehicle modifications, and pain and suffering.
What is the Canadian Medical Protective Association (CMPA)?
The CMPA is a mutual defence organization that provides legal defence and liability protection to physicians in Canada. When a medical malpractice claim is filed, the CMPA typically represents the physician. Having experienced legal representation on your side is important when facing the resources of the CMPA.

Looking for more answers?

Browse clear, plain-language answers to the questions we hear most about medical malpractice claims.

See All Medical Malpractice FAQs