Cartilage can have a smooth, pale appearance that some people may find unfamiliar.
However, cartilage does not explain every unusual object found in meat. A careful visual examination would be necessary before drawing a conclusion.
4. A foreign object
Occasionally, an unfamiliar material may not be part of the animal at all. It could be a fragment introduced during processing, packaging, transportation, or preparation.
If the object appears metallic, plastic-like, fibrous, or otherwise inconsistent with ordinary animal tissue, it should be treated as a potential foreign-object concern.
Do not continue cooking or serving the affected food while trying to determine whether the material is harmless.
5. A possible parasite or other biological material
Parasites can be associated with certain meats, including pork, and foodborne infections are a legitimate safety concern. However, a pale strand or unusual shape is not sufficient evidence that a parasite is present.
A true identification may require examination by a qualified professional or laboratory testing. The appearance of an object in hot oil cannot establish its identity or whether it poses a health risk.