Development and Validation of a Short Version of the Parisian Hamstring Avulsion Score (PHAS): The Short PHAS

The Parisian Hamstring Avulsion Score (PHAS) was recently validated for the assessment of proximal hamstring avulsion repair.

To validate a short version of the PHAS score: the short PHAS.

Cohort study (Diagnosis); Level of evidence, 3.

All patients who underwent proximal hamstring tendon avulsion repair between January 2020 and November 2023 were included. The tear was confirmed by preoperative magnetic resonance imaging. Proximal hamstring avulsion was repaired by surgical reinsertion with suture anchors. The long PHAS score, short PHAS score, and return to sport (RTS) were evaluated. The psychometric properties of the short PHAS, including its predictive value for RTS, were evaluated.

A prospective study was performed. A total of 335 patients were included in the final cohort, with a mean age of 48 ± 10 years. A subgroup of 30 patients was created to develop the short PHAS. A short PHAS score of 12 items (compared with 36 for the long version) was obtained. The internal consistency of the short version was excellent (Cronbach α = 0.85). The short PHAS was strongly correlated with the long PHAS (r = 0.94). The predictive value of both versions was moderate to good for RTS at 8 months. The predictive values of both the short and long PHAS are acceptable for RTS (area under the curve [AUC] = 0.75 for the short and 0.74 for the long PHAS), with a cutoff value of 39 of 65. Both the short and the long PHAS scores have a moderate predictive value for return to the same sport (AUC = 0.69 short vs 0.69 long PHAS), with a cut-off value of 46 of 65. Both the long and short PHAS scores have an acceptable predictive value for the return to the same sport at the preinjury level (AUC = 0.75 short vs 0.74 long PHAS), with a cutoff value of 47 of 65.

The short PHAS is a reliable and valid tool to assess RTS after proximal hamstring avulsion repair.

NCT02906865.