I have low-grade fever and warmness in my knee following an anterior cruciate ligament repair. Why could this be?

Q. What could be the reason for low-grade fever and warmness in my knee following an anterior cruciate ligament repair?

Answered by
Dr. Anuj Gupta
and medically reviewed by iCliniq medical review team.
This is a premium question & answer published on Oct 03, 2023 and last reviewed on: Dec 07, 2023

Hello doctor,

I underwent an anterior cruciate ligament (quad graft and meniscus) repair seven days ago. The surgery was performed under an epidural and went smoothly. Of course, the pain 24 hours post-operation was unbearable, but is getting better and I can already put 33 to 40 lbs weight on the operated knee. I have had a low-grade fever every night since the fourth day. I do not have any fever during the day, but from 7 or 8 pm, my temperature is around 37.8 to 38 degrees. My knee feels a little bit warm around the incision and on the swelling but I think that can be because I wear a brace and a special sock. I went to see my surgeon today, he said my incisions were fine. There was no redness, the swelling looks normal and he was not worried about the low-grade fever. I have the feeling I get those two symptoms (low-grade fever and a warm knee) after a long day. I feel quite tired and drained in the evening as I have to use so much more energy to compensate. What is your opinion? Do you think I should ask for a second opinion and get an appointment with a different surgeon?

Thank you.



Welcome to icliniq.com.

I understand your concern.

Thanks for the detailed description of your problem. I encounter similar issues very frequently in my practice. I do not consider 38 degrees as a fever. According to the literature, it is common to have this body temperature after surgery. In order to reduce my anxiety, I get a few blood tests which include complete blood count (CBC), erythrocyte sediment rate (ESR), and C-reactive protein (CRP). These are also deranged after surgery but I get them every alternate day three times and I get to know the trend. If total leukocyte count (TLC), or CRP has a falling trend, then I am worried. Now in your case, did you have any recent blood tests after surgery? Could you please send me a picture of your knee? Also, send me your X-rays. Do you have any complaints of a burning sensation while micturition? I can help you better after getting a picture of the area.

I hope this information will help you. Please revert in case of more queries.

Thank you.

Hello doctor,

Thank you for your reply.

I did not have a blood test after the surgery. I will ask my General practitioner for a blood test. I do not have any X-rays unfortunately. I do not have any burning sensation whilst urinating. However, I have noticed that I have to drink twice the amount of water than I normally do, in order to keep the color clear. I do not drink the required amount of water per day generally, but I feel like I have to now after the surgery to keep it healthy. I have attached a few pictures of my knee.

Thank you.



Welcome back to icliniq.com.

I have reviewed the pictures (attachments removed to protect patient privacy). The amount of swelling is normal after one week of surgery. It does not look alarming. You can go for blood tests. If you are doubtful about your urine, you can also give a sample of urine for routine tests and microscopy.

I hope this information will help you. Please revert in case of more queries.

Thank you.

Was this answer helpful?


Same symptoms doesn’t mean you have the same problem. Consult a doctor now!

Related Questions:
My ESR is too high. Do you think I have multiple myeloma?

I am having too much body pain and leg pain in my body ... Even painkillers not working at all ...   Read full

Can fungal infection cause low grade fever?

.. a chronic fever, which is called as pyrexia of unknown origin when we are unable to ascertain a cause. As your blood tests and x-ray are normal, lung infection is ruled out. Conditions causing chronic fever are numerous.   Read full

I am 80 kg. Will it affect the outcome of ACL operation?

.. the ACL surgery, if the surgery goes well, usually you will start walking with the long knee brace from the second day of the surgery. Normally, you will be able to walk on your own after six to eight weeks of surgery.   Read full

Also Read Answers From:

ideaComprehensive Medical Second Opinion.Submit your Case

Also Read

PCOS and Liver Problems
The hormonal imbalances in polycystic ovary syndrome could cause liver diseases. Read the article to know the relationship between these medical conditions.  Read more»
Inferior Alveolar Nerve Lateralization Technique
The inferior alveolar nerve lateralization technique is a surgical lateralization technique to reposition the nerve. Read the article to know more about this.  Read more»
COVID-19 and Ebola: Similarities and Differences
This article gives a comparison and broader overview of the outbreak of the two deadliest diseases that showed a greater incidence over the last two decades.  Read more»

Ask your health query to a doctor online?

Ask an Orthopaedician & Traumatologist Now

* guaranteed answer within 4 hours.

Disclaimer: No content published on this website is intended to be a substitute for professional medical diagnosis, advice or treatment by a trained physician. Seek advice from your physician or other qualified healthcare providers with questions you may have regarding your symptoms and medical condition for a complete medical diagnosis. Do not delay or disregard seeking professional medical advice because of something you have read on this website. Read our Editorial Process to know how we create content for health articles and queries.