Hi, well there are lots of surgeries that require staples Inside to stay forever! Like gastric bypass surgeries and other abdominal surgeries. So there is nothing wrong with finding a staple there since the doctor probably needed to attach a tendon, ligament, etc very strongly to the kneecap. I personally cannot pass through the xray machine at the airport without setting it off, so be happy with one! LoL hope this helps.
Hi there!
Staples may be used to secure some of the internal strictures in the knee as well. Though I’m not sure about the exact procedure he’s had but it is likely to be one of the internal staples in this case. You may discuss the situation in detail with his doctor.
Hope this helps.
Take care!