Roentgen Stereophotogrammetric Analysis has been used to study several types of fracture healing [1] including distal radius fractures [2, 3], femoral neck fractures [4-7], trochanteric fractures [8, 9], tibial plateau fractures [10], and ankle fractures [11-16]. RSA measurements of fracture motions allow the examination of healing patterns, time to fusion, the effect of loads, weightbearing, and different types of implants and osteosynthesis products in facilitating healing and stability [17].

A distal radius fracture study determined the amount of immobilization required to permit healing, and compared the effectiveness of injectable hydroxyapatite and splinting with external fixation [2]. Similarly, calcium phosphate cement has been shown to improve the outcomes of internal fixation in femoral neck fractures [8]. Studies of ankle fractures have examined the effect of screw fixation and weightbearing on healing [12, 13, 15].

Validation studies have examined the feasibility of using the technique to assess fracture healing with markers inserted in bone segments [11, 18-20].