Reliability of the acetabular teardrop as a landmark

J. E. Robb, L. A. Rymaszewski, H. B. Bentley, P. T. Donnan

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


This study investigated the effect of tilt and observer reliability on radiographic measurements of the position of a prosthetic acetabular cup in seven dry bone pelves using the teardrop as a landmark. Coronal or sagittal tilt of more than five degrees was easily recognisable and there was effectively no observer variation in the measurements up to this limit. In addition, 90 out of 100 randomly selected antero-posterior pelvic radiographs from an outpatient department were not significantly rotated and 93 demonstrated a clearly defined teardrop. Measurements about the teardrop on routine radiographs are therefore sufficiently accurate to allow assessment of prosthetic position.

Original languageEnglish
Pages (from-to)181-185
Number of pages5
JournalSurgical and Radiologic Anatomy
Issue number3
Publication statusPublished - Sept 1991


  • Anatomy
  • Pelvis
  • Radiology

ASJC Scopus subject areas

  • Anatomy
  • Surgery
  • Pathology and Forensic Medicine
  • Radiology Nuclear Medicine and imaging


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