Overview of joint tissue alterations in femoroacetabular impingement: What we know through laboratory analyses.

Hip osteoarthritis (HOA) is the most common hip joint disorder, accounting for approximately 27.9% of all cases of osteoarthritis (OA), often leading to total hip replacement (THR). In the last decades, femoroacetabular impingement (FAI) has been addressed as a significant etiological factor in the development of early-onset HOA, especially in young adults with non-dysplastic hips. FAI has been found to cause damage to all joint tissues, cartilage, labrum, and subchondral bone, thus underlining the importance of an early diagnosis and intervention to prevent progression to end-stage disease. This review aims to provide a comprehensive overview of the biochemical, morphological, and cellular alterations occurring in hip joint tissues in the presence of FAI. Understanding the early pathological changes is of crucial importance as they often precede radiographic signs of disease and may serve as valuable biomarkers for early detection and management of FAI and peri-arthritic conditions to delay or prevent the need for THR in younger populations.