(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.
Physical conditions or diseases that can cause knee pain: 1  osteoarthritis: pain, inflammation, and joint destruction caused by degeneration and deterioration of the joint. 2  tendinitis: pain in the front of the knee that is made worse when climbing, taking stairs, or walking up an incline.