Decrease of knee flexion torque in patients with ACL reconstruction: Combined analysis of the architecture and function of the knee flexor muscles

Yukiko Makihara, Akie Nishino, Toru Fukubayashi, Akihiro Kanamori

    Research output: Contribution to journalArticle

    66 Citations (Scopus)

    Abstract

    A decrease of deep knee flexion torque after anterior cruciate ligament (ACL) reconstruction, using a semitendinosus (and gracilis) tendon, has been reported. However, the cause of this weakness remains controversial. Architectural and functional differences in the knee flexor muscles influence this weakness, the fiber length of the semitendinosus, gracilis, semimembranosus, and biceps femoris were directly measured in six human cadavers. The flexion torque and EMG of the hamstrings were measured in both limbs of 16 patients (23 ± 5 years) after ACL reconstruction (12-43 months post-operation), using ipsilateral semitendinosus tendon. Magnetic resonance imagings were taken, over both the thighs of those patients, to measure muscle volume and to confirm a state of semitendinosus tendon regeneration. The position of the musculotendinous junction of the semitendinosus was also analyzed. The fiber length of the semitendinosus and gracilis were three to four times longer than that of the semimembranosus and biceps femoris. The difference of flexion torque between the normal and ACL reconstructed limbs significantly increased as the knee flexion angle increased. The EMG value for the semimembranosus and biceps femoris of both limbs as well as the semitendinosus of the ACL reconstructed limbs, significantly reduced as the knee flexion angle was increased. The volume of the semitendinosus in the reconstructed limb was significantly smaller than in normal limbs. The regeneration of the semitendinosus tendon was confirmed in all subjects, and the musculotendinous junction position of the reconstructed limb in almost all subjects was found in further image from the knee joint space than that for the normal limb. The decrease of deep knee flexion torque, after ACL reconstruction, could be due to the atrophy and shortening of the semitendinosus after its tendon has been harvested, as well as the lack of compensation from the semimembranosus and biceps femoris, due to the architectural differences between the semitendinosus and the semimembranosus and biceps femoris.

    Original languageEnglish
    Pages (from-to)310-317
    Number of pages8
    JournalKnee Surgery, Sports Traumatology, Arthroscopy
    Volume14
    Issue number4
    DOIs
    Publication statusPublished - 2006 Apr

    Fingerprint

    Anterior Cruciate Ligament Reconstruction
    Torque
    Knee
    Muscles
    Extremities
    Hamstring Muscles
    Anterior Cruciate Ligament
    Regeneration
    Muscle Weakness

    Keywords

    • ACL reconstruction
    • Architecture
    • EMG
    • Flexion torque
    • MRI

    ASJC Scopus subject areas

    • Orthopedics and Sports Medicine
    • Physical Therapy, Sports Therapy and Rehabilitation
    • Surgery

    Cite this

    Decrease of knee flexion torque in patients with ACL reconstruction : Combined analysis of the architecture and function of the knee flexor muscles. / Makihara, Yukiko; Nishino, Akie; Fukubayashi, Toru; Kanamori, Akihiro.

    In: Knee Surgery, Sports Traumatology, Arthroscopy, Vol. 14, No. 4, 04.2006, p. 310-317.

    Research output: Contribution to journalArticle

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