Levels of neuropeptide Y in synovial fluid relate to pain in patients with knee osteoarthritis

Table 2 Tomihisa Koshino’s radiographic grading for osteoarthritic knees in a weightbearing position ^a

Stage	Grade	Standing x-ray
	0	Normal
Early stage	1	Bone sclerosis or osteophyte formation
Middle stage	2	Narrowing of joint space (≤3 mm)
Middle stage	3	Obliteration of joint space or subluxation^b
Advanced stage	4	Defect of tibial plateau (<5 mm)
Advanced stage	5	Defect of tibial plateau (≥5 mm)

^aAn anteroposterior and weight-bearing radiograph taken in a standing position was used for grading.
^b“Subluxation” indicates the condition in which the medial edge of the medial tibial plateau shows a lateral shift by more than 5 mm against the medial edge of articular surface of the medial femoral condyle without including osteophyte.

ISSN: 1471-2474