For many patients, hip or knee arthritis does not affect only one side. When both joints are painful, stiff, and limiting daily life, the biggest question becomes:

Should I replace both joints at the same time — or separately?

At our private orthopedic practice in Montreal, approximately 20% of all hip and knee procedures are performed bilaterally (simultaneous). This modern approach has become increasingly popular because patients can avoid two separate surgeries, recover faster, and return to normal life sooner.

Backed by clinical research — including our own peer-reviewed scientific publication in 2024 — bilateral surgery is now considered a safe and efficient option for well-selected patients.

What Is Bilateral Joint Replacement?

“Bilateral” simply means both sides are operated on during the same anesthetic session:

• Bilateral THA – total hip replacement on both hips
  
• Bilateral TKA – total knee replacement on both knees
  
• Bilateral Hip Resurfacing – resurfacing both hips, either metal or ceramic (ReCerf)

This approach avoids having two separate hospital stays and two recovery periods.

Key Benefits of Bilateral Surgery

1. Avoids Two Surgeries, Two Anesthesias, Two Recoveries

Patients often fear having to undergo a second procedure after recovering from the first. Bilateral surgery eliminates this entirely.

Instead of repeating:

• preoperative tests
  
• anesthesia
  
• hospital stay
  
• physiotherapy
  
• time off work

You go through the experience once.

2. Faster Return to Normal Life

Because there is only one recovery period, patients are able to regain mobility more quickly overall. There is no “waiting period” between operations where one painful joint limits progress.

• You walk immediately after surgery — just like in unilateral procedures.
  
• The recovery period is only slightly longer, not double.
  
• Physical therapy is consolidated into one rehabilitation program.

Many patients return to work, travel, sports, or daily activities significantly sooner than if they had undergone two staged surgeries.

3. Proven Safety — Supported by Dr. Antoniou’s Peer-Reviewed Study

In 2024, we published a scientific paper comparing simultaneous vs. staged bilateral total hip arthroplasty (THA) in the European Journal of Orthopaedic Surgery & Traumatology.

Study Highlights:

• 160 patients included
  
• No difference in major or minor complications
  
• No increase in readmissions
  
• No increase in transfusion rates
  
• Shorter total hospital stay for simultaneous surgery
  
• Similar outcomes even in ASA 3 patients

Conclusion from Antoniou et al., 2024:

Simultaneous bilateral THA is a safe and effective procedure, with complication and readmission rates comparable to staged THA performed within one year.

This study reinforces that, when performed by experienced surgeons in a well-controlled environment, bilateral joint replacement is just as safe as staged surgery.

Why Bilateral Surgery Is Better Than Staged Surgery Within 18 Months

Most patients who need one joint replaced will require the second joint replaced within a year.

Studies — including ours — show that staging two surgeries within 6–18 months can lead to:

• More cumulative immobilization
  
• Longer time on pain medications
  
• Increased temporary disability
  
• Higher burden on the contralateral joint
  
• Potentially higher complication rates in some cohorts
  
• Double hospital visits, double anesthesia, double tests

Bilateral surgery offers one coordinated, efficient experience with lower overall stress.

Cost Advantages: Only ~50% Higher, Not Double

Many patients are surprised to learn that bilateral surgery is not twice the price.

Because many resources are shared, costs only rise by about 50%, not 100%:

• One anesthetic
  
• One OR team
  
• One hospital stay
  
• One set of bloodwork and imaging
  
• One postoperative physiotherapy program

This makes bilateral surgery a significantly more cost-effective option for patients paying privately.

Why Active Patients Choose Bilateral Surgery

Research has shown that bilateral patients often reach higher activity levels after surgery and return to sports and daily activities sooner.

Benefits for active patients include:

• Immediate full weight-bearing
  
• Balanced gait early in recovery
  
• No months-long limping on one painful joint
  
• Faster return to cycling, hiking, gym training, or sports

This also applies to hip resurfacing, where younger, active patients particularly benefit from:

• bone preservation
• lower dislocation risk
  
• natural range of motion
• excellent strength for high-level activities

Bilateral Hip Resurfacing: Metal & Ceramic (ReCerf)

Dr. Antoniou is among the small number of surgeons offering both metal resurfacing and ceramic resurfacing (ReCerf).

He is also a participant in the international, multicenter ReCerf clinical study, giving patients early access to cutting-edge implant technology.

For the right patient, resurfacing can:

• preserve more of your natural bone
• offer improved proprioception
• allow higher impact activity
• provide excellent bilateral outcomes

Who Is a Candidate for Bilateral Joint Replacement?

Most patients with bilateral disease are eligible if they are:

• ASA 1–3
  
• Medically optimized
  
• Motivated for recovery
  
• Interested in returning to activity quickly
  
• Without uncontrolled cardiopulmonary disease

Your 2024 study confirmed ASA 3 patients can safely undergo simultaneous bilateral THA when managed by an experienced surgical team.

Recovery Timeline Comparison

Below is a patient-friendly comparison of unilateral vs. bilateral expectations.

Unilateral vs. Bilateral Joint Replacement Overview