Roentgen single-plane photogrammetric analysis (RSPA.) A new approach to the study of musculoskeletal movement.

X Yuan, Leif Ryd, K E Tanner, Lars Lidgren

Research output: Contribution to journalArticlepeer-review

16 Citations (SciVal)


We present a new approach for the accurate reconstruction of three-dimensional skeletal positions using roentgen single-plane photogrammetric analysis (RSPA). This technique uses a minimum of three markers embedded in each segment which allow continuous, real-time, internal skeletal movement to be measured from single-plane images, provided that the precise distance between the markers is known. A simulation study indicated that the error propagation in this approach is influenced by focus position, object position, the number of control points, the accuracy of the previous measurement of the distance between markers and the accuracy of image measurement. For reconstruction of normal movement of the knee with an input measurement error of SD = 0.02 mm, the rotational and translational differences between reconstructed and original movement were less than 0.27 degrees and 0.9 mm, respectively. Our results showed that the accuracy of RSPA is sufficient for the analysis of most movement of joints. This approach can be applied in combination with force measurements for dynamic studies of the musculoskeletal system.
Original languageEnglish
Pages (from-to)908-914
JournalJournal of Bone and Joint Surgery: British Volume
Issue number6
Publication statusPublished - 2002

Subject classification (UKÄ)

  • Surgery
  • Orthopedics


  • Photogrammetry: methods
  • Computer-Assisted: methods
  • Support
  • Movement: physiology
  • Biological
  • Knee Joint: physiology
  • Non-U.S. Gov't
  • Models
  • Human
  • Image Processing
  • Computer Simulation


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