Rasch analysis of the forgotten joint score in patients with total hip arthroplasty.
Flavia Stano, Leonardo Pellicciari, Fabio La Porta and 6 others
PMID 38197243WHAT IT FOUND
The Italian Forgotten Joint Score works well for hip replacement patients, but only if you group the questions into five specific sub-scores.
This adjustment fixes measurement errors, allowing you to accurately track how aware patients are of their new joint.
Key findings
01The original 12-item score had measurement errors that required grouping items into five sub-scores to create a valid scale.
02Patients are most aware of their hip prosthesis during standing up, walking, and uneven terrain, and least aware when resting in bed or traveling.
03A conversion table was created to translate raw questionnaire scores into precise interval-level measurements for clinical use.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The sample size of 111, while sufficient for this specific statistical calibration, is relatively small, meaning the identified item groupings might change in a larger or more diverse population. The adjustments to the scale (rescoring and subtesting) were made after seeing the data (post-hoc), so these specific solutions may not generalize to other studies or patient groups without re-validation. The study excluded patients with neurological, visual, or cognitive impairments, so the scale's performance in those common comorbidities is unknown.
Declared interests
The authors declared no conflicts of interest.
The easy way to misread this
Do not use the standard 12-item sum score for clinical decision-making, as the original scale failed statistical validity tests. You must use the modified five-subtest structure and the provided conversion table to get accurate, interval-level measurements of joint awareness.