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I had an accident resulting in laceration above my knee cap. Is my knee infected?

Last week, I had an accident resulting in a laceration above my left knee cap to where I could see what I was told was a tendon. I had 4 stitches to my knee along with X-rays of my knee to ensure that nothing was damaged elsewhere. It has been a week now and I can walk with minor difficulty and am getting the stitches removed in a few days. When I apply antibiotic ointment as instructed or take a shower/wash or get the wound wet, the scab surrounding the stitches, within a few minutes, is covered in a moist layer of what looks like thick, solid, pus. It appears yellowish white and remains covering the wound until about 15 minutes after it is no longer in contact with water or when the ointment has dried up. It also leaks orange/yellow pus when it is wet and being bent or when pressure is applied. I have been told several times that pus= infection, but want the opinion of a profesional. Is my knee infected?
What an unfortunate accident! It sounds quite painful and frustrating, and hopefully you will be back to your normal self in no time. You are absolutely correct that with any kind of injury with skin breakdown like this, it is very important to make sure that infection does not develop. This could be quite problematic if an infection were to involve the joint space itself, so it is important to discuss any concerns with your physician. If you are concerned that the wound is leaking material that concerns you, you should definitely make sure your physician assesses the area to make sure that you do not have a developing infection. From what you describe, it sounds as though the moisture from either a shower or the antibiotic ointment is causing some changes in the appearance of the scab. A scab in any location will look "yellowish white" if allowed to soak in water. In addition, healing incisions will often drain small (sometimes not so small) amounts of what is called serosanguinous fluid. This is not a concern but rather just part of the healing process. However, it is always better to be safe than sorry in this kind of a situation, and the most important way to make sure you do not have a developing infection is to have your physician take a look at the laceration.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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