Semi-automated digital image analysis of joint space width in knee radiographs

J. E. Schmidt, K. K. Amrami, A. Manduca, Kenton R. Kaufman

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Objective: To design a semi-automated program to measure the minimum tibiofemoral joint space width (JSW) of knee radiographs. Design: Bilateral knee radiographs were obtained twice within a 2 week period from 34 asymptomatic research participants. Radiographic images were analyzed to report both the variability of the image analysis program and the reproducibility of JSW measurements within a 2 week period. In addition, the results were compared with minimum JSW measurements read manually by an experienced musculoskeletal radiologist. Results: The variability of the image analysis program was shown to be within one pixel. The results showed that reproducibility was better with the automated method. In addition, the manual method measured a greater minimum JSW than the automated method. There was no significant difference in between-day measurements. There was a significant difference reported between the automated and manual minimum JSW measurements. Conclusion: A novel semi-automated method for measurement of JSW has been developed.

Original languageEnglish (US)
Pages (from-to)639-643
Number of pages5
JournalSkeletal Radiology
Issue number10
StatePublished - Oct 2005


  • Joint space width
  • Knee
  • Osteoarthritis
  • Radiograph
  • Tibiofemoral joint

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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