Retronychia: A retrospective study of 25 cases

Classification of Retronychia: A Narrative Clinical Review

“…Yellowing of the nail can be evident: (1) distally, as accompanying onycholysis [3,19,23,24]; onycholysis is a potential predisposing and maintenance factor that leads to the retronychia by reducing the anchorage surface of the nail to nail bed [15,[24][25][26]. Similarly, concomitant disappearance (shrinkage or shortening) of the nail bed lastingly reduces this attachment, destabilizing nails and favoring backward displacement due to shearing forces [25]; (2) As a proximal yellow lunula (sometimes from an evident new nail growing beneath -Fig.…”

“…An apparent nail growth slowing/arrest is part of the clinical triad as this a common patient complaint [15,23,[28][29][30]. However, one can eventually observe a new nail growing underneath the old one, pushing on its underside and displacing it in a lifting motion.…”