TMJ (Temporomandibular Joint) pain refers to the facial pain accompanying clenching, grinding and clicking sound. 

Shoulder is a shallow ball and socket joint, it provides good flexibility but vulnerable to instability.

Sciatica should only be regarded as symptoms, not as a disease. Various reasons can cause sciatica, including piriformis syndrome, disc herniation, stenosis, etc.

Wrist and hand are very complicated organ with delicate and complex joints, different ligament, muscle and nerve. 

Neck pain covers the area between skull and upper thoracic, it may also involve neuopathic pain & symptoms.

Low back refers to the lumbar region below rib cages, the pelvic region between two hip joints, and its' pain can also be the neuropathic origin.

Knee pain originates from knee-cap, MCL , ACL and torn meniscus, baker's cyst and crepitus always also present.

Sprained ankle is the main pain of ankle injury, while bunion and plantar fasciitis are main sources of chronic pain.    

Elbow joint has static bony structure, and able to fulfil precise and skilful target with delicate muscle groups.