Knee-flexion torque and morphology of the semitendinosus after ACL reconstruction

Akie Nishino*, Akiko Sanada, Hiroaki Kanehisa, Toru Fukubayashi

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    36 Citations (Scopus)


    Purpose: The present study aimed to clarify the relationship between deficits in knee-flexion torque and morphological changes in the semitendinosus muscle-tendon complex after harvesting the semitendinosus tendon for anterior cruciate ligament (ACL) reconstruction. Methods: Isometric knee-flexion torque at 45 and 90° of knee flexion was measured in limbs of 23 patients (22 ± 4 yr) who underwent unilateral ACL reconstruction (12-43 months postoperation) using ipsilateral semitendinosus tendon. Magnetic resonance imaging scans were used to calculate the muscle volume and the muscle length of the semitendinosus and to confirm the presence of the regenerated semitendinosus tendon. Results: The percentage of the knee-flexion torque of the ACL-reconstructed limb compared with that of the contralateral limb was lower at 90° than at 45°. The regeneration of the semitendinosus tendon-like structure was confirmed in 21 of the 23 patients. However, muscle volume and muscle length of the semitendinosus in the ACL-reconstructed limb were significantly smaller compared with in the contralateral limb. Conclusion: Deficits in knee-flexion torque at deep knee flexion were associated with the atrophy and shortening of the semitendinosus after harvesting the semitendinosus tendon for ACL reconstruction.

    Original languageEnglish
    Pages (from-to)1895-1900
    Number of pages6
    JournalMedicine and Science in Sports and Exercise
    Issue number11
    Publication statusPublished - 2006 Nov


    • Deep knee flexion
    • Muscle length
    • Muscle volume
    • Tendon regeneration

    ASJC Scopus subject areas

    • Public Health, Environmental and Occupational Health
    • Physical Therapy, Sports Therapy and Rehabilitation
    • Orthopedics and Sports Medicine


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