A hip strain occurs when one of the muscles supporting the hip joint is stretched beyond its limit or torn. Strains may be mild, moderate, or severe, depending on the extent of the injury. … The lower abdominal muscles and hip flexor muscles are often involved in a hip strain. Reproduced from JF Sarwark, ed: Essentials of Musculoskeletal Care …
https://orthoinfo.aaos.org/en/diseases–conditions/hip-strains