Sentence:  Our approach in these cases was initially to revaginate or fixate the Benchekroun hydraulic valve (patients 4, 6); however, since <WSD>revagination</WSD> does not preclude the nearly ubiquitous development of significant stomal stenosis, we have more recently (patients 2, 9, 10,  11) opted to convert stenotic  or devaginated Benchekroun hydraulic continent stomas to flap-valve efferent limbs based upon the Mitrofanoff principle [2, 4, 10]. 
Meaning of the word marked with <WSD> tags:  The act of growing or creating a new sheath.