Anterior–posterior stability of the knee by an MR image subtraction method

Arno, Sally; Chaudhary, Mahesh; Walker, Peter S.; Forman, Rachel; Glassner, Philip J.; Regatte, Ravinder R.; Oh, Cheongeun

doi:10.1016/j.knee.2011.05.007

Cited by 11 publications

(10 citation statements)

References 46 publications

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“…Meniscal movements of the model followed closely experimental results (Vedi et al 1999;Arno et al 2011). During the loading response, the highest radial displacement of , 2 mm was predicted for the lateral meniscus, whereas during the terminal stance, the highest radial displacement of , 2.5 mm was predicted to occur in the medial meniscus.…”

Section: Discussionsupporting

confidence: 76%

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Implementation of a gait cycle loading into healthy and meniscectomised knee joint models with fibril-reinforced articular cartilage

Mononen¹,

Jurvelin²,

Korhonen³

2013

Computer Methods in Biomechanics and Biomedical Engineering

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Computational models can be used to evaluate the functional properties of knee joints and possible risk locations within joints. Current models with fibril-reinforced cartilage layers do not provide information about realistic human movement during walking. This study aimed to evaluate stresses and strains within a knee joint by implementing load data from a gait cycle in healthy and meniscectomised knee joint models with fibril-reinforced cartilages. A 3D finite element model of a knee joint with cartilages and menisci was created from magnetic resonance images. The gait cycle data from varying joint rotations, translations and axial forces were taken from experimental studies and implemented into the model. Cartilage layers were modelled as a fibril-reinforced poroviscoelastic material with the menisci considered as a transversely isotropic elastic material. In the normal knee joint model, relatively high maximum principal stresses were specifically predicted to occur in the medial condyle of the knee joint during the loading response. Bilateral meniscectomy increased stresses, strains and fluid pressures in cartilage on the lateral side, especially during the first 50% of the stance phase of the gait cycle. During the entire stance phase, the superficial collagen fibrils modulated stresses of cartilage, especially in the medial tibial cartilage. The present computational model with a gait cycle and fibril-reinforced biphasic cartilage revealed time- and location-dependent differences in stresses, strains and fluid pressures occurring in cartilage during walking. The lateral meniscus was observed to have a more significant role in distributing loads across the knee joint than the medial meniscus, suggesting that meniscectomy might initiate a post-traumatic process leading to osteoarthritis at the lateral compartment of the knee joint.

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Section: Discussionsupporting

confidence: 76%

“…In our model, movements of the meniscal horns were , 0.6 mm during the first peak loading force. In the experimental measurements (axial load of 660 N and flexion angle of 158), the corresponding values for movements of meniscal horns varied between 0 and 0.68 mm (Arno et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Implementation of a gait cycle loading into healthy and meniscectomised knee joint models with fibril-reinforced articular cartilage

Mononen¹,

Jurvelin²,

Korhonen³

2013

Computer Methods in Biomechanics and Biomedical Engineering

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“…The methodology used was similar to the protocol of Arno et al [6]. Subjects were placed supine in a plastic rig with the nonsurgical knee at 15°of flexion.…”

Section: Assessment Of Footprint and Stabilitymentioning

confidence: 99%

“…This was then repeated for the knee that underwent the ACL reconstruction. The loads used were chosen to mimic anatomic loading conditions, although the compression was reduced by a factor of 3 because it was not practical for patients to sustain such loads for the duration of the MRI scan [6,15,21].…”

Section: Assessment Of Footprint and Stabilitymentioning

confidence: 99%

Does Anteromedial Portal Drilling Improve Footprint Placement in Anterior Cruciate Ligament Reconstruction?

Arno

Bell

Alaia

et al. 2016

Clinical Orthopaedics &Amp; Related Research

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Background Considerable debate remains over which anterior cruciate ligament (ACL) reconstruction technique can best restore knee stability. Traditionally, femoral tunnel drilling has been done through a previously drilled tibial tunnel; however, potential nonanatomic tunnel placement can produce a vertical graft, which although it would restore sagittal stability, it would not control rotational stability. To address this, some suggest that the femoral tunnel be created independently of the tibial tunnel through the use of an anteromedial (AM) portal, but whether this results in a more anatomic footprint or in stability comparable to that of the intact contralateral knee still remains controversial. Questions/purposes (1) Does the AM technique achieve footprints closer to anatomic than the transtibial (TT) technique? (2) Does the AM technique result in stability equivalent to that of the intact contralateral knee? (3) Are there differences in patient-reported outcomes between the two techniques? Methods Twenty male patients who underwent a bonepatellar tendon-bone autograft were recruited for this study, 10 in the TT group and 10 in the AM group. Patients in each group were randomly selected from four surgeons at our institution with both groups demonstrating similar demographics. The type of procedure chosen for each patient was based on the preferred technique of the surgeon. Some surgeons exclusively used the TT technique, whereas other surgeons specifically used the AM technique. Surgeons had no input on which patients were chosen to participate in this study. Mean postoperative time was 13 ± 2.8 and 15 ± 3.2 months for the TT and AM groups, respectively. Patients were identified retrospectively as having either the TT or AM Technique from our institutional database. At followup, clinical outcome scores were gathered as well as the footprint placement and knee stability assessed. To assess the footprint placement and knee stability, three-dimensional surface models of the femur, tibia, and ACL were created from MRI scans. The femoral and tibial footprints of the ACL reconstruction as compared with the intact contralateral ACL were determined. In addition, the AP displacement and rotational displacement of the femur were determined. Lastly, as a secondary measurement of stability, KT-1000 measurements were obtained at the followup visit. An a priori sample size calculation indicated that with 2n = 20 patients, we could detect a difference of 1 mm with 80% power at p \ 0.05. A Welch two-sample t-test (p \ 0.05) was performed to determine differences in the footprint measurements, AP displacement, rotational displacement, and KT-1000 measurements between the TT and AM groups. We further used the confidence interval approach with 90% confidence intervals on the pairwise mean group differences using a Games-Howell post hoc test to assess equivalence between the TT and AM groups for the previously mentioned measures. Results The AM and TT techniques were the same in terms of footprint except in the distal...

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“…13 The radioactivity and the high intensity magnetic field of X-ray and MRI image can cause severe harm to human body. Also the bone mirror detection can give rise to physical pain for patients.…”

Section: Infrared Image Characteristic Of Knee Jointmentioning

confidence: 99%

Research on Potential Pathological Knee Diagnosis for Undergraduates by Infrared Image Analysis

Chen¹

2014

J Med Imaging Hlth Inform

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Infrared imaging has been used in clinical treatment for many years, but it is not applied widely due to its non-unique standard, unsharp imaging, and difficult feature extraction, etc. A method was presented in this study to diagnose the recessive pathological knee among the undergraduates by infrared image analysis. 200 undergraduates were chosen as the experimental subjects. The data were collected by the thermal infrared imager in a quiet room with constant temperature. The infrared images were converted into gray level images, and the gray levels of pixels in the images were converted into a sequence that correspond to the number of the pixels in each gray level. The standard curve of the multi-scale entropy value for the normal knee joint was obtained by the statistics of numerous healthy knees. Discrepancies were identified between the entropy values of abnormal knee joints and the values of the health ones. According to the differences, the degree of lesion was diagnosed. If the multi-scale entropy of the pixel series sequence in a knee infrared image was lower than that of the standard entropy in the vast majority of the scales, the knee could be diagnosed with pathological change. This infrared imaging method could be utilized for general health screening and curative effect tracing.

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Anterior–posterior stability of the knee by an MR image subtraction method

Cited by 11 publications

References 46 publications

Implementation of a gait cycle loading into healthy and meniscectomised knee joint models with fibril-reinforced articular cartilage

Implementation of a gait cycle loading into healthy and meniscectomised knee joint models with fibril-reinforced articular cartilage

Does Anteromedial Portal Drilling Improve Footprint Placement in Anterior Cruciate Ligament Reconstruction?

Research on Potential Pathological Knee Diagnosis for Undergraduates by Infrared Image Analysis

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