MR Evaluation of Human Anterior Cruciate Ligament Autograft on Oblique Axial Imaging

Murakami, Yuji; Sumen, Yoshio; Ochi, Mitsuo; Fujimoto, Eisaku; Adachi, Nobuo; Ikuta, Yoshikazu

doi:10.1097/00004728-199803000-00021

Cited by 55 publications

(35 citation statements)

References 13 publications

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“…⁎⁎ SIR is significantly higher at 6 months postoperatively than at 3 or 12 months postoperatively (p b 0.0001). months postoperatively [26], and was attributable to proliferating hypervascular tissue embracing the graft [27,28]. In the present study, mean SIR was compared between groups at 12 months postoperatively, because several human studies have proposed that at least 12 months are needed to complete graft maturation [29][30][31][32] and allow patients to resume strenuous sports activities.…”

Section: Discussionmentioning

confidence: 96%

Clinical significance of T2*-weighted gradient-echo MRI to monitor graft maturation over one year after anatomic double-bundle anterior cruciate ligament reconstruction: A comparative study with proton density-weighted MRI

et al. 2015

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Section: Discussionmentioning

confidence: 96%

Clinical significance of T2*-weighted gradient-echo MRI to monitor graft maturation over one year after anatomic double-bundle anterior cruciate ligament reconstruction: A comparative study with proton density-weighted MRI

et al. 2015

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“…It has been demonstrated that the ACL may be imaged effectively in planes that are based on the natural course of the ligament, and it is likely that this will also facilitate visualization of the individual AM and PL bundles [3,9,13]. Two such planes of view are the para-coronal plane and the oblique-sagittal plane (Fig.…”

Section: Inter-observer Evaluationmentioning

confidence: 99%

Assessment of normal ACL double bundle anatomy in standard viewing planes by magnetic resonance imaging

Starman

VanBeek

Armfield

et al. 2007

Knee Surg Sports Traumatol Arthrosc

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Anatomical studies show that the native ACL consists of two distinct functional bundles, termed the anteromedial (AM) and posterolateral (PL) bundles. The utility of using routine magnetic resonance imaging (MRI) to distinguish the individual bundles of the ACL has not been evaluated. The purpose of this study was to evaluate the intra- and inter-observer agreement for assessment of the AM and PL bundles using MRI in the axial, coronal, and sagittal viewing planes. We identified a series of patients seen in the senior author's clinic during a 16-month period. Images were independently evaluated in blinded fashion at two separate time points by a musculoskeletal radiologist and two orthopaedic residents. The AM bundle was detected in most planes of view with high frequency and reliability, while detection of the PL bundle was less frequent and had a lower associated reliability. Our results indicate that it is difficult to reliably detect both the AM and PL bundles using a low-field strength magnet with standard planes of view. It has been demonstrated that the ACL may be imaged effectively in planes that are based on the natural course of the ligament, and it is likely that this will also facilitate visualization of the individual AM and PL bundles. The use of additional oblique planes of view offers a potential approach for improved evaluation of the ACL, even with low field strength magnets. Future work in this area may assist in the pre-operative assessment of isolated AM or PL bundle injuries, facilitating a more anatomic approach to ACL reconstruction.

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“…Reconstruction of the ACL was carried out under arthroscopy using a combination of a double-looped autogenous semitendinosus-gracilis tendon graft and a LeedsKeio artificial ligament graft simultaneously. 18 No surgical insult was inflicted to the quadriceps femoris muscle or extensor mechanism. The mean interval between the injury and the ACL reconstruction was 7.5 months within a range of 2 to 26 months.…”

Section: Subjectsmentioning

confidence: 99%

Electromechanical Delay after ACL Reconstruction: An Innovative Method for Investigating Central and Peripheral Contributions

Kaneko

Onari²,

Kawaguchi³

et al. 2002

J Orthop Sports Phys Ther

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Objectives:The purpose of this study was to investigate the electromechanical properties of atrophied muscle in patients with anterior cruciate ligament (ACL) reconstruction and to examine the relationship of changes in these properties for a voluntarily elicited maximal isometric contraction and peripherally stimulated twitch contraction. Background: It is not known if, following ACL reconstruction, a prolonged reaction time to a sudden stimulus is due to impaired proprioception in the knee joint, a prolonged processing interval in the central nervous system, or a greater elasticity in the series elastic component of the quadriceps femoris. Methods: Seventeen patients were recruited 2 to 3 months following a unilateral ACL reconstruction. Both the involved leg (ACL-invo group) and the uninvolved leg (ACL-uninvo group) were studied. Twenty-two athletes (training group) and 18 control subjects (control group) were also tested. These subjects performed voluntary maximal isometric contraction (MVC) of the quadriceps femoris. Maximal twitch response was also elicited by a supramaximal electrical stimulation to the femoral nerve, and surface electromyograms were recorded from the vastus lateralis in all four groups. Results: Total reaction time for MVC in the ACL-invo group (250.47 ms) was prolonged compared to that of the control and training groups. Twitch response in the ACL-invo group (25.26 ms) was prolonged compared to that of the other three groups. Premotor time during both MVC and twitch response did not differ among the four groups. Electromechanical delay during MVC (53.62 ms) and the evoked electromechanical delay in twitch response (20.04 ms) were prolonged in the ACL-invo group as compared to the other three groups. Conclusions: Prolonged electromechanical delay in twitch response may be due to peripheral physiological disruptions (eg, stiffness of the series elastic component, changes of peripheral Science and Biomedical Engineering, Tsukuba, muscle fiber-type composition, or a decrease in function of the excitation-contraction coupling process). A prolonged electromechanical delay in twitch response can also explain the prolonged electromechanical delay observed for MVC. These findings suggest that prolonged total reaction time in MVC, when secondary to a visual stimulus in atrophied human quadriceps femoris muscle after ACL reconstruction, may be principally due to prolongation of electromechanical delay produced by peripheral physiological alterations. However, the contribution of premotor time to prolonged total reaction time was not revealed. Our results do not completely eliminate the possibility that central nervous system processing time and other neural factors are involved in the prolongation of reaction time. J Orthop Sports Phys Ther 2002;32:158-165.

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MR Evaluation of Human Anterior Cruciate Ligament Autograft on Oblique Axial Imaging

Abstract: We conclude that high signal intensity can be seen within stable ACL grafts.

Cited by 55 publications

References 13 publications

Clinical significance of T2*-weighted gradient-echo MRI to monitor graft maturation over one year after anatomic double-bundle anterior cruciate ligament reconstruction: A comparative study with proton density-weighted MRI

Clinical significance of T2*-weighted gradient-echo MRI to monitor graft maturation over one year after anatomic double-bundle anterior cruciate ligament reconstruction: A comparative study with proton density-weighted MRI

Assessment of normal ACL double bundle anatomy in standard viewing planes by magnetic resonance imaging

Electromechanical Delay after ACL Reconstruction: An Innovative Method for Investigating Central and Peripheral Contributions

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