Orthopaedic Studio is an application designed to help orthopaedic specialists perform several common quantitative hip examinations that are based on standard x-ray images.

The application is implemented as a plugin for the medical image viewer OsiriX

OsiriX

OsiriX is an image processing application dedicated to DICOM images produced by medical equipment . Osirix is complementary to existing viewers, in particular to nuclear medicine viewers. It can also read many other file formats: TIFF , JPEG, PDF, AVI, MPEG and Quicktime...

 and thereby only runs on Mac OS X

Mac OS X

Mac OS X is a series of Unix-based operating systems and graphical user interfaces developed, marketed, and sold by Apple Inc. Since 2002, has been included with all new Macintosh computer systems...

.

Orthopaedic Studio evaluates four different types of hip radiographs (standing anteroposterior, Von Rosen, false profile and frog). On such images a number of standardized angles, offsets and ratios can be measured, including:

• Lateral collateral ligament angle
• Tönnis angle
• Joint space width
• Pelvic tilt and rotation
• Anterior centre edge angle
• Femoral head-neck offset ratio
• Frog Alpha angle
• Frog modified Alpha angle for slipped capital femoral epiphysis
  Slipped capital femoral epiphysis
  Slipped capital femoral epiphysis is a medical term referring to a fracture through the physis , which results in slippage of the overlying epiphysis....
  
   (SCFE
  SCFE
  SCFE may refer to:* Slipped capital femoral epiphysis* South Central Florida Express, Inc....
  
  )
• Epiphysis-metaphyseal offset for SCFE
  SCFE
  SCFE may refer to:* Slipped capital femoral epiphysis* South Central Florida Express, Inc....
  
  
• Southwick angle for SCFE
  SCFE
  SCFE may refer to:* Slipped capital femoral epiphysis* South Central Florida Express, Inc....
  
  

The following visual scores can also be registered:

• Break in Shenton's line
• Cross-over sign
• Posterior wall sign
• Tönnis classification
• Joint congruity