A Novel Small Animal Model of Differential Anterior Cruciate Ligament Reconstruction Graft Strain

J Knee SurgDOI: 10.1055/s-0034-1390331The aim of the study was to establish a small animal research model of anterior cruciate ligament (ACL) reconstruction where ACL graft force can be predictably altered with knee motion. Cadaveric rat knees (n = 12) underwent ACL resection followed by reconstruction. Six knees received anterior (high-tension) femoral graft tunnels and six knees received posterior (isometric) graft tunnels. All the 12 knees and ACL grafts were pretensioned to 3 N at 15 or 45 degrees of knee flexion. ACL graft force (N) was recorded as the knee was ranged from extension to 90-degree flexion. Distinct ACL graft force patterns were generated for a high-tension and isometric femoral graft tunnels. For a high-tension femoral tunnel, the rat ACL graft remained relatively isometric at lower knee flexion angles but increased as the knee was flexed beyond 45 degrees. At 90 degrees, high-tension grafts had significantly greater mean graft tension for both pretensioning at 15 degrees (5.58 ± 1.34 N, p = 0.005) and 45 degrees (6.35 ± 1.24 N, p = 0.001). In contrast, the graft forces for isometric ACL grafts remained relatively constant with knee flexion. Compared with a high-tension ACL grafts, the graft force for grafts placed in an isometric tunnel had significantly lower ACL graft forces at 60, 75, and 90 degrees of knee flexion for both pretensioning at 15 and 4...
Source: Journal of Knee Surgery - Category: Orthopaedics Authors: Tags: Original Article Source Type: research

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AbstractPurposeTo study the effect of age, duration of injury, type of graft and concomitant knee injuries on return to sports after anterior cruciate ligament (ACL) reconstruction.MethodOne-hundred and sixteen athletes underwent ACL reconstruction using either bone –patellar tendon–bone graft (BPTB;n = 58) or semitendinosus-gracilis graft (n = 58), depending upon their random number sequences. Five variables were analyzed in terms of their effect on return to sports-age, type of graft, time interval between injury and surgery, chondral damage and meniscal tears.ResultsFifty-three ou...
Source: Knee Surgery, Sports Traumatology, Arthroscopy - Category: Orthopaedics Source Type: research
Publication date: May–June 2020Source: Revista Española de Cirugía Ortopédica y Traumatología (English Edition), Volume 64, Issue 3Author(s): F. Oliva Moya, B. Sotelo Sevillano, J.M. Vilches Fernández, M. Mantic Lugo, J. Orta Chincoa, J.A. Andrés García
Source: Revista Espanola de Cirugia Ortopedica y Traumatologia - Category: Orthopaedics Source Type: research
Anterior cruciate ligament (ACL) rupture is one of the most common types of knee joint sports injury. Patients with a rupture of the ACL may lead to swelling, pain, instability, mechanical dysfunction, and non-surgical treatment will also increase the risk of further meniscus injury and degenerative joint disease [1,2]. The most frequently used auto-grafts for ACL reconstruction (ACLR) are bone-patellar tendon-bone (BPTB) and four-strand hamstring tendon (4S-HT), but significant controversy exists about which graft is better.
Source: Injury - Category: Orthopaedics Authors: Source Type: research
ConclusionsMidterm results at an average follow-up of 3  years after the surgery showed good functional outcomes using the transphyseal ACL reconstruction technique with good return to activity. There were no cases of leg length discrepancy or angular deformity. Transphyseal ACL reconstruction is a viable method of treatment for adolescent ACL tears.
Source: Irish Journal of Medical Science - Category: General Medicine Source Type: research
AbstractPurposeTo determine the prevalence of a deep lateral femoral notch sign (LFNS) in magnetic resonance imaging (MRI) in patients with anterior cruciate ligament (ACL) and concomitant posterior root tears of the lateral meniscus (PLRT).MethodsA retrospective chart review was conducted to identify all patients undergoing ACL reconstruction between 2016 and 2018. Based on the arthroscopic appearance of the lateral meniscus, patients were assorted to one of three groups: isolated ACL tear (ACL-Group), ACL tear with concomitant lateral meniscus tear not involving the posterolateral root (Meniscus-Group), and ACL tear with...
Source: Knee Surgery, Sports Traumatology, Arthroscopy - Category: Orthopaedics Source Type: research
Conclusions Based on level 2 evidence, passing a combination of functional tests with predetermined cutoff points used as RTS criteria is associated with reduced reinjury rates. A combination of isokinetic strength and hop tests is recommended during RTS testing.
Source: Medicine and Science in Sports and Exercise - Category: Sports Medicine Tags: CLINICAL SCIENCES Source Type: research
The objective was to determine if knee joint contact and ligament forces differ between pre– and post–anterior cruciate ligament (ACL) reconstructed states and if these forces relate to their patient’s respective subjective functional ability scores. Methods Twelve patients performed a hopping task before and after reconstruction. Magnetic resonance images and OpenSim were used to develop patient-specific models in static optimization and joint reaction analyses. Questionnaires concerning each patient’s subjective functional ability were also collected and correlated with knee joint contact and l...
Source: Medicine and Science in Sports and Exercise - Category: Sports Medicine Tags: APPLIED SCIENCES Source Type: research
AbstractThe anterolateral ligament (ALL) and capsule of the knee are anatomical structures involved in rotational stability and pivot-shift control. As such, it has been demonstrated that the extra-articular anterolateral procedures improve clinical outcome when performed as an augmentation of the anterior cruciate ligament (ACL) reconstruction in specific groups of patients. This review describes the postoperative imaging findings of two techniques used to perform these procedures, using magnetic resonance imaging (MRI), computed tomography (CT), and radiography. The first technique described is the lateral extra-articula...
Source: Skeletal Radiology - Category: Radiology Source Type: research
Condition:   Anterior Cruciate Ligament Rupture Intervention:   Sponsors:   Clinical Exercise Physiology and Rehabilitation Reasearch Laboratory;   KAT General Hospital Completed
Source: ClinicalTrials.gov - Category: Research Source Type: clinical trials
This study aimed to assess the clinical and radiographic outcomes of BPTB and gracilis (G) composite autografts for primary double-bundle ACL reconstruction in Asian athletes. Thirty-two Asian patients undergoing double-bundle ACL reconstruction with 7.0 to 7.5 mm of BPTB and 5.0 to 5.5 mm of G composite grafts were compared with 43 double-bundle ACL reconstruction with hamstring graft cases. The BPTB graft was used for the anteromedial bundle (AMB), with the G graft for the posterolateral bundle (PLB). Percentage of femoral bone tunnel enlargement compared with the original size was determined by computed di...
Source: Journal of Knee Surgery - Category: Orthopaedics Authors: Tags: Original Article Source Type: research
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