“…6 Nathan,7 after the experimental production of nonsuppurative arthritis in animals, concluded that pain in spondylitis may be referred from nerve roots which are compressed as they leave their bony outlets either by inflamed ligaments and capsules or by adhesions, in the infectious variety of spondylitis, and by pressure of osteophytes and of thickened soft tissues in the hypertrophie variety. 6 Nathan,7 after the experimental production of nonsuppurative arthritis in animals, concluded that pain in spondylitis may be referred from nerve roots which are compressed as they leave their bony outlets either by inflamed ligaments and capsules or by adhesions, in the infectious variety of spondylitis, and by pressure of osteophytes and of thickened soft tissues in the hypertrophie variety.…”