What does this research mean for the field?

The Triangular Index Ratio (TIR) is a valid alternative method to the Alpha Angle for defining cam morphology, with a baseline TIR ≥1.05 being predictive of radiographic hip osteoarthritis development 10 years later. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate the effectiveness of the triangular index ratio (TIR) as a method for defining cam morphology compared to the alpha angle (AA).

April 5, 2026

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Triangular Index Ratio as An Alternative Method to the Alpha Angle for Defining the Presence of Cam Morphology: A Prospective Cohort Study

JTJinchi TangErasmus MC FBFleur BoelErasmus MC MBM.W. van BuurenErasmus MC

Puntos clave

To evaluate the effectiveness of the triangular index ratio (TIR) as a method for defining cam morphology compared to the alpha angle (AA).
Analyzed data from a prospective cohort study
Measured cam morphology using triangular index ratio and alpha angle
Monitored development of RHOA over a 10-year period
Cam morphology defined by TIR ≥1.05 is linked to RHOA development after 10 years
TIR may provide a definition of cam morphology more associated with RHOA
Both TIR and AA can effectively identify cam morphology cases

Resumen

Cam morphology defined by a TIR ≥1.05 at baseline is associated with the development of RHOA 10 years later. TIR may offer a definition of cam morphology more closely related to RHOA while AA may avoid losing too many target cases. Both methods can therefore be used to define cam morphology.

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Cite This Study

Tang et al. (Fri,) studied this question.

synapsesocial.com/papers/69d1fc70a79560c99a0a1f9e https://doi.org/https://doi.org/10.1002/acr.80052

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