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  • Title: [Loss of strength and regeneration of knee extensor musculature after operations of the knee ligaments. EMG studies of the effect of the injury pattern, surgical procedure and after-care with special reference to electromyostimulation].
    Author: Hörster G, Kedziora O.
    Journal: Aktuelle Traumatol; 1993 Aug; 23(5):244-54. PubMed ID: 7901979.
    Abstract:
    Clinically relevant losses of the capacity of the extensor muscles of the thigh to contract voluntarily are usual after open knee joint operations and are known to lead frequently to a major delay in healing. In the present paper, a randomized prospective comparative study is presented in which the negative effect of the injury and surgical trauma on the extensor musculature of the thigh is compared between open and arthroscopically controlled cruciate ligament operations. The surface electromyogram is measured. The values found make it evident that an equally pronounced loss of strength amounting to more than 90% results after injuries in the region of the cruciate ligament apparatus and in open as well as arthroscopically controlled reconstruction operations. The alterations are mainly attributable to the surgical trauma. The injury on its own only leads to a roughly 25% loss of strength in the preoperative investigation. With an appropriate programme of follow-up treatment, the strength values are only partially restored after about six weeks. In the follow-up treatment, electromyostimulation has a significantly positive effect on the rectus femoris muscle, but not on the vastus lateralis muscle. According to our investigations, it is of preeminent importance to consider how to avoid the negative effect of the operation (with particular consideration of the arthroscopic procedure) on the function of the thigh musculature.
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