Bilateral Knee Replacement: Both Knees at Once or One by One?

If both knees are badly worn, you face a big choice: replace both together in one surgery, or do one now and the other a few months later. Neither is right for everyone. The best plan depends on your age, your heart and lungs, your weight and how well you can manage recovery.

What is bilateral knee replacement?

Bilateral means both sides. Bilateral knee replacement is when both knees are replaced. It can be done in two ways:

• Simultaneous: both knees are replaced under the same anaesthesia, in one operation

• Staged: one knee is done first, and the second a few weeks or months later, in a separate hospital stay

Both knees at once: benefits

• One anaesthesia, one hospital stay and one round of recovery

• Overall hospital cost is often lower

• Less time away from work and family

• No wait for the second knee, and no need to go through surgery fear twice

• Many people find rehabilitation easier, since neither knee is a weak side

Both knees at once: risks

• A longer operation, usually 2 to 3 hours

• More blood loss, so a transfusion may be needed

• A higher chance of heart and lung strain, blood clots and confusion, especially in older or unwell patients

• Early walking and exercises can be tougher, with two sore knees

• If a complication occurs, it affects both knees

One by one (staged): pros and cons

Staged surgery is safer for many people. The body gets time to recover, and the second operation can be planned when you feel strong again. The downsides are two hospital stays, two periods of recovery, higher total cost and a longer time with one painful knee. A gap of 3 to 6 months is common, though some surgeons plan it sooner.

Who is suitable for both knees at once?

• Younger, fit and active patients, often under 70

• Good heart, lung and kidney function

• Controlled blood pressure and diabetes

• Both knees equally painful or deformed

• A healthy weight, or a weight that is not extreme

• A good support system at home

Who should consider staged surgery?

• Older or frail patients

• Heart disease, lung disease, a history of blood clots or stroke

• Uncontrolled diabetes, high blood pressure or obesity

• One knee much worse than the other

• Anyone who is anxious about the recovery

Your surgeon and anaesthetist will decide after a full fitness check. The choice is about safety first, and convenience second.

	Both at once	One by one
Number of operations	One	Two
Hospital stays	One	Two
Total recovery time	Shorter	Longer
Overall cost	Often lower	Often higher
Risk of serious complication	Higher, in some patients	Lower
Best for	Fit, younger patients	Older patients, or those with other illness

Recovery

Recovery is like that after a single knee replacement, but longer and a little harder. Most people stay 3 to 5 days, use a walker for the first weeks, and need physiotherapy daily. Many return to light desk work after 4 to 8 weeks and feel much better by 3 to 6 months. Full recovery takes up to a year.

Get help now: Go to the emergency room now if you have chest pain, breathlessness, or pain and swelling in one calf. These can be signs of a blood clot. Also seek urgent help for fever with a red, hot or leaking wound.

Questions to ask your surgeon

• Am I fit enough for both knees at once?

• What is your experience with bilateral surgery?

• What are the risks in my case?

• How long will I stay, and what will the estimate include?

• What help will I need at home?

Common questions

Is it safe to replace both knees at once? For carefully selected, healthy patients, yes. For others, staged surgery is safer.

How long should the gap be if I choose staged surgery? Often 3 to 6 months, depending on how you recover.

Does insurance cover bilateral knee replacement? Many policies do after the waiting period. Check how they treat two knees in one stay.

Will both knees take twice as long to heal? Not exactly. Both knees heal together, but you may feel slower in the first weeks.

Have questions or want to see a specialist? For appointment and queries, call 8156929292. AXTEN HOSPITALS - HONEST SURGERY, HONEST CARE.