What question did this study set out to answer?

To standardize the description of patellofemoral motion and compare various techniques used in the literature.

Standardisation of the description of patellofemoral motion and comparison between different techniques

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Comparative review identifies preferred techniques for patellofemoral motion description, suggesting a standardized method for clinical use.

To standardize the description of patellofemoral motion and compare various techniques used in the literature.
Reviewed and categorized methods of patellofemoral motion description.
Conducted experiments to compare the efficacy of different techniques.
Proposed a standardized method based on anatomical landmarks.
Patellar flexion measurements varied by up to 26% depending on descriptive methods used.
Tilt and shift were sensitive to the choice of coordinate systems.
A combined method using readily identifiable anatomical landmarks was found most clinically relevant.

Bull et al. (2002) studied this question.

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Comparative review identifies preferred techniques for patellofemoral motion description, suggesting a standardized method for clinical use.