On the inside of the capsule, articular cartilage covers the end surfaces of the bones that articulate within that joint.The outer layer is highly innervated by the same nerves which perforate through the adjacent muscles associated with the joint.
Injections are among the most common health care procedures, with at least 16 billion administered in developing and transitional countries each year. 95% of injections are administered in curative care, 3% are for immunization, and the rest for other purposes, such as blood transfusions.
In an Intradermal Injection, medication is delivered directly into the dermis, the layer just below the epidermis of the skin. The injection is often given at a 5 to 15 degree angle with the needle placed almost flat against the patient's skin.