X線北大病期分類(大腿・脛骨関節)
Ⅰ Bone spur only
Ⅱ Narrowing of joint space(less than 1/2 normai joint space)
Ⅲ Narrowing of joint space(more than 1/2 normal joint space)
Ⅳ Obliteration of joint space or minor bone attriation (under 1 cm)
Ⅴ Major bone attriation (over 1 cm),’subluxation, or secondary lateral arthrosis
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