Knee Surgery Expert Witness

Knee surgery cases can involve very different questions depending on the procedure and the injury being claimed. A total knee replacement case may focus on implant positioning or postoperative complications. An ACL reconstruction case may center on tunnel placement, graft selection, or rehabilitation. A trauma case may involve whether surgery was indicated at all.

Because the knee is treated across multiple orthopedic subspecialties, the best expert is usually one whose active practice closely matches the procedure being challenged. A general orthopedic surgeon may be appropriate for some cases, while others are better suited to a fellowship-trained knee, sports medicine, or adult reconstruction specialist.

The expert should be selected based on the operation and the specific criticism of care. For how that matching works across medicine generally, see medical expert witness sourcing.

Total Knee Replacement Cases

Total knee arthroplasty is one of the most common procedures involved in knee surgery litigation.

Disputes may concern whether replacement was indicated, whether conservative treatment had been exhausted, implant selection, alignment, component positioning, soft tissue balancing, fixation, or postoperative management.

Some cases arise after persistent pain or stiffness. Others involve instability, infection, fracture, nerve injury, vascular injury, or the need for revision surgery.

A poor result alone does not establish negligent surgery. Knee replacement patients can continue to experience pain or limited function despite technically appropriate treatment. The expert must determine whether the complication falls within recognized surgical risk or whether the medical record supports a departure from the standard of care.

Partial Knee Replacement

Unicompartmental, or partial, knee replacement presents a different set of questions from total knee arthroplasty.

Patient selection can be especially important. The expert may need to evaluate the location and severity of arthritis, ligament stability, alignment, symptoms, activity level, and whether disease in other compartments made a partial replacement inappropriate.

Cases can also involve component position, progression of arthritis, loosening, persistent pain, or conversion to total knee replacement.

An expert who routinely performs partial knee replacement is generally better positioned to evaluate these issues than someone whose experience is limited to general orthopedic surgery. For how qualification attaches to the specific opinion, see qualifying an expert witness.

ACL Reconstruction

ACL cases commonly involve athletes and other active patients who sustain instability after ligament injury.

Litigation may focus on diagnosis, timing of surgery, graft selection, tunnel placement, graft fixation, infection, loss of motion, recurrent instability, or graft failure.

The expert may also need to distinguish a technical surgical failure from reinjury. An ACL graft can fail after a new traumatic event even when the original reconstruction was performed properly.

Rehabilitation is also relevant. Failure to regain motion, premature return to activity, weakness, or poor adherence to therapy may affect the outcome and should be considered when evaluating causation. A physical medicine and rehabilitation physician may be useful when functional recovery itself is disputed.

Meniscus Surgery

Meniscus cases may involve repair, partial meniscectomy, or treatment performed alongside another knee procedure.

The expert may be asked whether the tear was appropriately characterized, whether repair was feasible, how much tissue should have been removed, or whether the patient's symptoms were actually attributable to the meniscus.

Postoperative pain does not necessarily mean that the procedure was unsuccessful. Arthritis, cartilage damage, ligament injury, and other pathology can continue to cause symptoms after meniscus surgery.

A useful opinion should account for the condition of the knee as a whole rather than evaluating the meniscus in isolation.

Patellar and Extensor Mechanism Surgery

Surgery involving the patella, patellar tendon, quadriceps tendon, or extensor mechanism can produce significant functional impairment when complications occur.

Cases may involve patellar fracture fixation, tendon repair, instability procedures, realignment, or complications after knee replacement.

An expert may need to evaluate repair technique, fixation, postoperative restrictions, recurrent rupture, patellar tracking, or whether the patient received appropriate rehabilitation.

Because extensor mechanism failure can substantially affect walking and stair use, these cases may also involve disputes about long-term function and future treatment.

Postoperative Infection

Infection after knee surgery can range from a superficial wound problem to a deep periprosthetic joint infection.

The expert analysis may focus on recognition of symptoms, wound management, laboratory testing, aspiration, culture results, antibiotic treatment, surgical debridement, or decisions regarding implant retention or removal.

Joint replacement infections can require multiple procedures, including irrigation and debridement, staged revision, or long-term antimicrobial therapy.

The appropriate expert may include an orthopedic surgeon and, in some cases, an infectious disease physician. The orthopedic expert addresses the surgical management, while infectious disease may address antimicrobial treatment and infection control. For when that split is necessary, see when your case needs two expert witnesses.

Nerve and Vascular Injury

Major nerves and blood vessels pass close to the knee, creating a recognized risk of injury during some procedures.

Cases may involve peroneal nerve injury, vascular damage, postoperative numbness, weakness, foot drop, or compromised blood flow.

An expert may need to determine whether the injury was a known complication despite appropriate technique or whether the surgical record suggests avoidable trauma. A vascular surgeon may be needed when the alleged injury is arterial or involves compromised blood flow.

The timing of symptoms, operative documentation, postoperative examinations, electrodiagnostic testing, and vascular studies can all help distinguish the mechanism and severity of the injury.

Postoperative Stiffness and Loss of Motion

Some patients develop substantial stiffness after knee surgery.

After knee replacement, this may lead to manipulation under anesthesia, arthroscopic treatment, or revision surgery. Following ligament reconstruction, stiffness can interfere with return to activity and may become a major source of disability.

The expert may evaluate preoperative range of motion, operative factors, pain control, therapy participation, scar formation, timing of rehabilitation, and whether intervention for stiffness was appropriate.

These cases often require careful review of the patient's function over time because range of motion can change significantly during recovery.

Revision Knee Surgery

Revision procedures raise different issues from primary surgery.

A patient may require revision because of infection, loosening, wear, instability, malalignment, fracture, stiffness, implant failure, or persistent symptoms. The reason for the revision is important because the need for additional surgery does not necessarily mean the original procedure was negligent.

An expert may be asked to determine whether the revision diagnosis supports a technical problem with the original operation, a recognized complication, progression of disease, or another cause.

Adult reconstruction specialists can be particularly valuable when the case involves complex revision arthroplasty.

Was Knee Surgery Necessary?

Some cases challenge the decision to operate rather than the manner in which surgery was performed.

The expert may need to review the patient's symptoms, examination, imaging, prior treatment, functional limitations, and whether nonoperative options had been attempted.

The existence of an abnormal MRI does not automatically establish the need for surgery. Degenerative changes, meniscal tears, cartilage loss, and other findings may be present in patients without symptoms. Radiology may be needed when imaging interpretation itself is disputed.

The analysis should therefore connect the patient's clinical presentation to the procedure that was recommended.

Causation After Knee Surgery

Causation can become difficult when the patient had significant knee disease before the operation.

Arthritis, prior injuries, previous surgeries, obesity, deformity, ligament instability, and other conditions can affect both surgical risk and postoperative recovery.

An expert may be asked whether the claimed impairment resulted from surgical negligence, a recognized complication, the patient's underlying condition, or a later event.

The strongest causation opinions explain the relationship between the preoperative condition, the procedure, the postoperative course, and the specific injury being claimed.

Records Reviewed in Knee Surgery Litigation

Knee cases often require review of office notes, preoperative imaging, MRI studies, radiographs, operative reports, implant records, postoperative films, physical therapy documentation, wound records, revision surgery reports, and prior orthopedic history.

The actual imaging can be critical. Implant alignment, fracture, hardware position, ligament injury, cartilage loss, and progression of arthritis may not be adequately understood from a written report alone.

Therapy records are also useful because they document range of motion, strength, pain, gait, and functional progress throughout recovery. Related orthopedic issues are also covered in our orthopedic surgery expert witness overview.

Choosing the Right Knee Surgery Expert

The procedure should drive the expert selection.

A sports medicine orthopedic surgeon may be the best fit for ACL reconstruction or meniscus surgery. An adult reconstruction specialist may be more appropriate for knee replacement and complex revision. An orthopedic trauma surgeon may be needed for fractures around the knee or injuries resulting from major trauma.

The expert's current surgical practice matters because knee procedures evolve over time. An opinion is generally more defensible when it comes from a surgeon who regularly performs the procedure and manages the complication being reviewed. Start an expert witness search when you are ready to retain.