title: Ultrex cylinders: problems with uncontrolled lengthening (the S-shaped deformity).
abstract: OBJECTIVE
  We investigated whether the AMS Ultrex cylinder, developed to provide cylinder lengthening while controlling girth expansion, acted as a tissue expander and, thus, promoted penile lengthening.
  
  
  METHODS
  Between December 1990 and January 1992, 59 AMS Ultrex prostheses were implanted. Cylinder length corresponded to intracorporeal measurements. The results of lengthening and occurrence of an S-shaped deformity were statistically analyzed.
  
  
  RESULTS
  No penile lengthening occurred. In 19 patients (32%) cylinder replacement was required for the S-shaped deformity.
  
  
  CONCLUSIONS
  Ultrex cylinders should be downsized and prolonged inflation should be avoided. They should not be implanted in cases of Peyronie's disease, or to replace malleable or self-contained inflatable implants.
mesh_terms: D007172:Erectile Dysfunction / Q000601:surgery; D006801:Humans; D008297:Male; D010410:Penile Erection; D010411:Penile Induration / Q000601:surgery; D015917:Penile Prosthesis / Q000009:adverse effects / Q000295:instrumentation; D010413:Penis / Q000601:surgery; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation; D012307:Risk Factors; D015625:Tissue Expansion Devices