A convex-shaped projection (26) extends from the lower plate and engages an articular surface defined by a concave recess (28) formed in the upper plate.
一凸形突起物（26）延伸自下板，并接合一关节表面，该关节表面由在上板中形成的一凹入凹处（28）所限定。
A convex-shaped projection (26) extends from the lower plate and engages an articular surface defined by a concave recess (28) formed in the upper plate.
一凸形突起物（26）延伸自下板，并接合一关节表面，该关节表面由在上板中形成的一凹入凹处（28）所限定。
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