Common Complications After Knee Replacement Surgery: Warning Signs, Risks & When to Contact Your Surgeon
Total Knee Replacement is a commonly performed procedure for patients with advanced knee arthritis. While most patients progress through recovery without major problems, every surgery carries potential risks.
Understanding the possible complications after knee replacement surgery does not mean patients should be frightened of the procedure. Instead, it helps them recognise what may be part of normal recovery and what deserves medical attention.
Here are some important complications and warning signs patients should know about.
1. Infection After Knee Replacement
Infection is one of the complications surgeons take particularly seriously after knee replacement.
An infection may involve the surgical wound or, less commonly, deeper tissues surrounding the artificial joint.
Warning signs can include:
- Increasing redness around the wound
- Increasing warmth or swelling
- Wound discharge
- Persistent fever
- Increasing pain rather than gradual improvement
Some redness and swelling can occur during recovery, so patients should avoid self-diagnosis and contact their surgical team if they are concerned.
2. Blood Clots After Knee Replacement
Reduced mobility following surgery can increase the risk of blood clots developing in the leg, known as Deep Vein Thrombosis (DVT).
Possible warning signs include:
- New or increasing calf pain
- Calf tenderness
- Increasing swelling of the leg, ankle or foot
- Redness above or below the knee
If a clot travels to the lungs, it may cause a pulmonary embolism. Sudden breathlessness or chest pain requires urgent medical attention.
Surgeons may use medication, early mobilisation and other measures to reduce this risk depending on the patient’s individual situation.
3. Knee Stiffness
Some stiffness is expected during the early stages of knee replacement recovery.
However, significant or persistent stiffness can affect the patient’s ability to bend or straighten the knee.
Structured physiotherapy, pain control and appropriate exercises are therefore important components of rehabilitation.
Patients should follow the rehabilitation programme recommended by their surgeon and physiotherapist rather than forcing the knee beyond advised limits.
4. Persistent Pain After Knee Replacement
Pain does not disappear immediately after surgery.
Surgical healing itself causes temporary discomfort. Pain should generally change as recovery progresses.
Persistent or unexplained pain may have several possible causes and requires proper clinical evaluation.
Patients should not assume that every episode of pain means that the implant has failed.
5. Swelling After Knee Replacement
Swelling around the knee and lower leg is commonly experienced during recovery.
The amount and duration vary considerably between patients.
However, sudden or progressively increasing swelling — particularly when associated with calf pain, redness, fever or breathlessness — should not simply be ignored.
6. Implant-Related Problems
Modern knee implants are designed for long-term use, but problems can occasionally occur over time.
These may include:
- Implant loosening
- Wear
- Instability
- Problems around the bone or implant
- Need for revision surgery in selected cases
Long-term follow-up can help the surgeon assess the replaced joint.
7. Nerve or Blood Vessel Injury
Nerves and blood vessels surround the knee joint. Injury to these structures is uncommon but is a recognised surgical risk.
Patients should discuss individual risks with their surgeon before surgery.
What Is Normal After Knee Replacement?
Patients frequently become concerned about:
- Swelling
- Bruising
- Mild warmth
- Temporary stiffness
- Surgical discomfort
Some of these may occur as part of postoperative healing.
The important distinction is whether symptoms are gradually improving or becoming more severe.
When Should You Contact Your Surgeon?
Patients should seek medical advice if they experience concerning symptoms such as:
- Increasing wound redness or drainage
- Persistent fever
- Sudden increase in pain
- Significant new swelling
- Calf pain or tenderness
- Sudden breathlessness
- Chest pain
Can Knee Replacement Complications Be Prevented?
Not every complication is preventable.
However, risk reduction begins with:
- Proper patient evaluation
- Pre-operative planning
- Infection-control protocols
- Appropriate surgical technique
- Early mobilisation when suitable
- Medication compliance
- Structured rehabilitation
- Regular follow-up
According to Dr. Abhishek Bhalotia’s approach to Joint Replacement, patients should understand both the benefits and potential risks before undergoing surgery. An informed patient is better prepared to participate actively in recovery.
Key Takeaway
Most postoperative symptoms do not automatically indicate a complication. At the same time, unusual or worsening symptoms should never be ignored.
The safest approach is simple: when in doubt, communicate with the treating surgical team rather than trying to diagnose the problem through the internet.
Medical Disclaimer: This article is intended for general educational purposes only and does not constitute medical advice. Patients experiencing new, severe or worsening symptoms after knee replacement should contact their treating healthcare professional promptly.
