(8) The meter measures the difference in voltage between the two sides of the glass and converts this potential difference into a pH reading. (9) Reference electrode acts as a baseline or reference for the measurementâor you can think of it as simply completing the circuit.
The most common causes are: Patellofremoral pain-this is mainly an injury felt at the front of the knee but can also cause symtoms on the inside of the knee. Medial meniscus tear-is a tear or degeneration of the semi cicular cartilage discs found in the knee joint.he most common causes are: Referred pain-which can come from an injury or problem in the lower back, front of the knee or other nerve problem in the hip of buttocks. Biceps femoris tendinopathy-which is inflammation or degeneration of the tendon of one of the hamstring muscles as it inserts into the back of the knee.
Both of these types of injuries can cause pain and swelling as well as difficulty straightening the leg. Another main cause of knee pain is degeneration. Osteoarthritis of the knee is considered a âwear and tearâ condition in which the cartilage in the knee degenerates as we age.