Background: Arthroscopic labral repair is a common intervention for managing femoroacetabular impingement and labral tears, often preceding total hip arthroplasty (THA). However, the biomechanical impact of prior labral repair on the stability and success of subsequent hip arthroplasty remains unclear. This study aims to evaluate whether prior hip arthroscopy affects the stability and biomechanics of the hip joint post-arthroplasty. Materials and Methods: A total of 40 cadaveric hip specimens were divided into two groups: Group A (n=20) underwent arthroscopic labral repair followed by THA, while Group B (n=20) underwent THA alone. Biomechanical testing was performed using a robotic testing system to assess hip stability, range of motion, and joint resistance under various loading conditions. Parameters such as dislocation force (measured in Newtons), range of internal and external rotation (measured in degrees), and peak contact pressure (measured in MPa) were recorded and compared between groups. Results: Group A exhibited a 12% reduction in dislocation force compared to Group B (mean 160 N vs. 182 N, p=0.03). The mean internal rotation range was slightly lower in Group A (18.5° ± 2.3°) compared to Group B (21.2° ± 2.6°), while external rotation differences were not statistically significant. Peak contact pressure was slightly increased in Group A (4.8 MPa vs. 4.2 MPa, p=0.05), suggesting altered load distribution. Conclusion: Prior arthroscopic labral repair may marginally reduce hip stability following THA, as indicated by a lower dislocation force and altered biomechanical parameters. Although the differences are statistically significant, further clinical correlation is needed to assess long-term functional outcomes. Surgeons should consider these findings when planning THA in patients with a history of labral repair.