Semitendinosus tendons in physically immature patients have a lower type I collagen content. - Mizuno, Yushin; Takata, Yasushi; Yoshioka, Kazuaki; Takemoto, Naoki; Nishimura, Manase; Fujita, Kentaro; Sengoku, Takuya; Miyagi, Sakae; Demura, Satoru; Nakase, Junsuke (Knee Surgery, Sports Traumatology, Arthroscopy, 2026)