Highly Cross-linked Polyethylene Liner Dissociation from a Cement-less Modular Acetabular Shell: Two Case Reports

Table 1: Findings from the extracted liner.

	Alternative side		Back side
	Anterior side	Posterior side	Anterior side	Posterior side
Case 1	Surface of the end face is crushed due to friction with the stem neck following dissociation, which is believed to have caused exfoliation in some areas	Partial damage to the elevate rim and end face surface	Partial scratches from the click of the shell in the upper center	Belt-like scratch marks caused by the click of the shell occurring in the process leading to dissociation
Case 2	Surface of the end face is crushed due to friction with the stem neck following dissociation, which is believed to have caused exfoliation in some areas	Partial damage to the elevate rim and end face surface	Partial scratches from the click of the shell in the lower center	Scratch marks throughout a large area caused by the click of the shell occurring in the process leading to dissociation