Association between posterior thigh tightness and lifetime low back pain in young basketball players: a cross-sectional study. - Watanabe K; Otoshi K; Tsuda K; Sonobe T; Kaneuchi Y; Kameda T; Kobayashi H; Kato K; Hakozaki M; Nikaido T; Matsumoto Y (BMC sports science, medicine & rehabilitation, 2026)