Background <p>The ultimate goal of arthroplasty is thought to be the ability to “forget” a joint implant in daily activities. The Forgotten Joint Score (FJS-12), a score system that evaluates how much patients have been able to forget their hip or knee prosthesis, was recently published. It is based on a self-administered questionnaire that consists of 12 items. The major goal of the current study was to validate, adapt, and evaluate a Arabic-language FJS-12 (Ar-FJS-12) version in patients who had undergone total hip replacement (THA).</p> Materials and methods <p>The study included 107 patients who underwent THA 1–5 years ago and completed the Ar-FJS. The construct validity of the study was evaluated using the reduced Western Ontario and McMaster Universities Osteoarthritis Index (rWOMAC). To assess the test-retest reliability, 72 people took the Ar-FJS test twice.</p> Results <p>Cronbach’s alpha (Internal Consistency) of the Ar-FJS-12 was 0.957 and the intraclass correlation coefficient (ICC) was 0.931 indicating high reliability. For construct validity, there was a moderate significant correlation between the Arabic the rWOMAC with <i>r</i> = 0.595. The ceiling effect was 1.9% (<i>n</i> = 2), whereas the floor effect was 1.9% (<i>n</i> = 2).</p> Conclusion <p>The Arabic version of the FJS-12 valid, reliable tool and can be recommended for patients in Arabic-speaking communities who have undergone hip arthroplasty.</p> Level of evidence <p>III, validity and reliability study.</p>