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Posterior Cruciate

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https://www.readbyqxmd.com/read/28646383/anterior-cruciate-ligament-graft-fixation-first-in-anterior-and-posterior-cruciate-ligament-reconstruction-best-restores-knee-kinematics
#1
Libin Zheng, Soheil Sabzevari, Brandon Marshall, Junjun Zhu, Monica A Linde, Patrick Smolinski, Freddie H Fu
PURPOSE: To evaluate the effect of different graft fixation sequences in one-stage anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL) reconstruction on (1) knee biomechanics and (2) tibiofemoral alignment. METHODS: Twelve porcine knees were used in this study. Five fixation sequences were performed (angle indicating knee flexion): (a) PCL at 30° and ACL at 30°, (b) PCL at 90° and ACL at 30°, (c) ACL at 30° and PCL at 30°, (d) ACL at 30° and PCL at 90°, and (e) ACL and PCL simultaneous fixation at 30°...
June 23, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28636429/autograft-versus-allograft-for-posterior-cruciate-ligament-reconstruction-an-updated-systematic-review-and-meta-analysis
#2
John W Belk, Matthew J Kraeutler, Justin M Purcell, Eric C McCarty
BACKGROUND: Multiple studies have demonstrated a higher risk of graft failure after anterior cruciate ligament reconstruction with allograft, but limited data are available comparing outcomes of posterior cruciate ligament reconstruction (PCLR) with autograft versus allograft. PURPOSE: To compare the clinical outcomes of autograft versus allograft for primary PCLR. STUDY DESIGN: Systematic review. METHODS: A systematic review was performed by searching PubMed, the Cochrane Library, and EMBASE to locate studies (level of evidence I-III) comparing clinical outcomes of autograft versus allograft in patients undergoing primary PCLR with the conventional transtibial technique...
June 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28632053/the-effect-of-a-secondary-cognitive-task-on-landing-mechanics-and-jump-performance
#3
Boyi Dai, Ross F Cook, Elizabeth A Meyer, Yvonne Sciascia, Taylour J Hinshaw, Chaoyi Wang, Qin Zhu
Anterior cruciate ligament (ACL) injuries commonly occur during jump-landing tasks when individuals' attention is simultaneously allocated to other objects and tasks. The purpose of the current study was to investigate the effect of allocation of attention imposed by a secondary cognitive task on landing mechanics and jump performance. Thirty-eight recreational athletes performed a jump-landing task in three conditions: no counting, counting backward by 1 s from a randomly given number, and counting backward by 7 s from a randomly given number...
February 28, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28617518/tibiofemoral-instability-after-primary-total-knee-arthroplasty-posterior-stabilized-implants-for-obese-patients
#4
Ata Can, Fahri Erdogan, Ayse Ovul Erdogan
Tibiofemoral instability is a common complication after total knee arthroplasty (TKA), accounting for up to 22% of all revision procedures. Instability is the second most common cause of revision in the first 5 years after primary TKA. In this study, 13 knees with tibiofemoral instability after TKA were identified among 693 consecutive primary TKA procedures. Patient demographics, body mass index, clinical symptoms, previous deformity, previous knee surgery, complications, interval between index TKA and first tibiofemoral instability, causes of instability, and interval between index TKA and revision TKA were retrospectively reviewed...
June 15, 2017: Orthopedics
https://www.readbyqxmd.com/read/28615108/kinematics-of-different-components-of-the-posterolateral-corner-of-the-knee-in-the-lateral-collateral-ligament-intact-state-a-human-cadaveric%C3%A2-study
#5
Christoph Domnick, Karl-Heinz Frosch, Michael J Raschke, Nils Vogel, Martin Schulze, Mathias von Glahn, Tobias C Drenck, Mirco Herbort
PURPOSE: To determine the static stabilizing effects of different anatomical structures of the posterolateral corner (PLC) of the knee in the lateral collateral ligament (LCL)-intact state. METHODS: Thirteen fresh-frozen human cadaveric knees were dissected and tested using an industrial robot with an optical tracking system. Kinematics were determined for 134 N anterior/posterior loads, 10 N m valgus/varus loads, and 5 N m internal/external rotatory loads in 0°, 20°, 30°, 60°, and 90° of knee flexion...
June 11, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28614288/evaluation-of-the-tibial-tubercle-to-posterior-cruciate-ligament-distance-in-a-pediatric-patient-population
#6
Blake Clifton, Dustin L Richter, Dan Tandberg, Matthew Ferguson, Gehron Treme
BACKGROUND: Evaluation of distal extensor mechanism alignment continues to evolve in children with patella instability. Prior studies support the use of the tibial tubercle to trochlear groove (TT-TG) distance but limitations exist for this measurement including: changes in the TT-TG distance with knee flexion, difficulty with finding the deepest part of a dysplastic trochlea, and limitations regarding identification of the site of the anatomic abnormality. The tibial tubercle-posterior cruciate ligament (TT-PCL) distance has been introduced as an alternative measure to address the shortcomings in the TT-TG distance by quantifying the position of the TT independent of the trochlea and with respect to the tibia only...
June 13, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28612204/three-dimensional-isotropic-magnetic-resonance-imaging-can-provide-a-reliable-estimate-of-the-native-anterior-cruciate-ligament-insertion-site-anatomy
#7
Daisuke Araki, Eric Thorhauer, Scott Tashman
PURPOSE: This study quantified the error in anterior cruciate ligament (ACL) insertion site location and area estimated from three-dimensional (3D) isotropic magnetic resonance imaging (MRI) by comparing to native insertion sites determined via 3D laser scanning. METHODS: Isotropic 3D DESS MRI was acquired from twelve fresh-frozen, ACL-intact cadaver knees. ACL insertion sites were manually outlined in each MRI slice, and the resulting contours combined to determine the 3D insertion site shape...
June 13, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28607939/the-role-of-the-peripheral-passive-rotation-stabilizers-of-the-knee-with-intact-collateral-and-cruciate-ligaments-a-biomechanical-study
#8
Alexander R Vap, Jason M Schon, Gilbert Moatshe, Raphael S Cruz, Alex W Brady, Grant J Dornan, Travis Lee Turnbull, Robert F LaPrade
BACKGROUND: A subset of patients have clinical internal and/or external knee rotational instability despite no apparent injury to the cruciate or collateral ligaments. PURPOSE/HYPOTHESIS: The purpose of this study was to assess the effect of sequentially cutting the posterolateral, anterolateral, posteromedial, and anteromedial structures of the knee on rotational stability in the setting of intact cruciate and collateral ligaments. It was hypothesized that cutting of the iliotibial band (ITB), anterolateral ligament and lateral capsule (ALL/LC), posterior oblique ligament (POL), and posteromedial capsule (PMC) would significantly increase internal rotation, while sectioning of the anteromedial capsule (AMC) and the popliteus tendon and popliteofibular ligament (PLT/PFL) would lead to a significant increase in external knee rotation...
May 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28606122/anterior-tibial-curved-cortex-is-a-reliable-landmark-for-tibial-rotational-alignment-in-total-knee-arthroplasty
#9
Joong Il Kim, Jak Jang, Ki Woong Lee, Hyuk Soo Han, Sahnghoon Lee, Myung Chul Lee
BACKGROUND: Rotational alignment of the tibial component is important for long-term success of total knee arthroplasty (TKA). This study aimed to compare five axes in normal and osteoarthritic (OA) knees to determine a reliable landmark for tibial rotational alignment in TKA. METHODS: One hundred twenty patients with OA knees and 40 with normal knees were included. The angle between a line perpendicular to the surgical transepicondylar axis and each of five axes were measured on preoperative computed tomography...
June 12, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28601246/clinical-outcome-of-medial-pivot-compared-with-press-fit-condylar-sigma-cruciate-retaining-mobile-bearing-total-knee-arthroplasty
#10
Young-Hoo Kim, Jang-Won Park, Jun-Shik Kim
BACKGROUND: The purpose of this study was to compare the long-term clinical results, radiographic results, range of knee motion, patient satisfaction, and the survival rate of Medial-Pivot posterior cruciate-substituting, knee prosthesis and a press-fit condylar (PFC) Sigma cruciate-retaining mobile-bearing knee prosthesis in the same patients. METHODS: One hundred eighty-two patients received Medial-Pivot knee prosthesis in one knee and a PFC Sigma knee prosthesis in the contralateral knee...
May 18, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28594528/international-perspective-on-revision-anterior-cruciate-ligament-reconstruction-what-have-we-been-missing
#11
Mohammad Humza Ansari, Steven Claes, Daniel C Wascher, Philippe Neyret, Michael J Stuart, Aaron J Krych
Primary anterior cruciate ligament (ACL) reconstruction is a common orthopaedic procedure. A graft failure rate of 5% to 10% after primary ACL reconstruction has resulted in an increased need for revision ACL reconstruction. ACL reconstruction failure etiologies include trauma, technical errors, and biologic factors. Based on the current literature, the outcomes of revision ACL reconstruction are clearly inferior compared with those of primary reconstruction. A thorough patient evaluation, including surgical history, a physical examination, and imaging studies, is crucial in the assessment of a failed ACL reconstruction...
February 15, 2017: Instructional Course Lectures
https://www.readbyqxmd.com/read/28593015/target-range-of-motion-for-rehabilitation-after-total-knee-arthroplasty
#12
Hirotaka Mutsuzaki, Ryoko Takeuchi, Yuki Mataki, Yasuyoshi Wadano
Objective: Postoperative knee range of motion (ROM) is among the most important factors influencing patient satisfaction after total knee arthroplasty (TKA). The purpose of this study was to clarify the time course of improvement in knee ROM up to 12 months after TKA, including intraoperative knee ROM after implantation, and to clarify a target ROM for rehabilitation after TKA. Patients and Methods: In total, 39 knee joints in 26 patients with osteoarthritis who underwent TKA (retaining the posterior cruciate ligament) were evaluated...
May 2017: Journal of Rural Medicine: JRM
https://www.readbyqxmd.com/read/28583062/multiple-ligament-reconstruction-for-absent-cruciate-and-a-congenital-short-femur-case-report-and-review-of-the-literature
#13
Daniel Kaplan, Taylor Jazrawi, Jason Capo, Eric Strauss
Congenital short femur syndrome is a rare condition affecting about 0.017 of every 1,000 births. Patients frequently have ligamentous abnormalities, most frequently aplastic or hypoplastic cruciate ligaments. Advances in limb lengthening procedures have increased movement expectations for these patients, thus necessitating surgical treatment for their ligamentous abnormalities. An individual case is presented, including history, physical exam, and imaging demonstrating both the short femur and absent cruciate ligaments...
April 2017: Bulletin of the Hospital for Joint Diseases
https://www.readbyqxmd.com/read/28582784/tibial-onlay-posterior-cruciate-ligament-reconstruction-surgical-technique-and-results
#14
Rodrigo Salim, Felipe Marques do Nascimento, Aline Miranda Ferreira, Luciano Fonseca Lemos de Oliveira, Fabricio Fogagnolo, Mauricio Kfuri
No abstract text is available yet for this article.
June 5, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28580257/posterior-surgical-approach-to-the-knee
#15
Scott C Faucett, James Gannon, Jorge Chahla, Marcio B Ferrari, Robert F LaPrade
Posterior knee approaches are reliable techniques to address the treatment of various pathologies of the posterior region of the knee, including Baker cyst excision, tibial plateau fracture fixation, posterior cruciate ligament avulsions and inlay reconstructions, femoral condyle cartilage procedures, posterior meniscal repair and loose body removal among others. Surgery in the posterior knee region can be challenging because of the presence of neurovascular structures including the tibial nerve, popliteal artery and vein, and common peroneal nerve; thus, it is less commonly performed...
April 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28580251/multiligament-reconstruction-of-the-knee-in-the-setting-of-knee-dislocation-with-a-medial-sided-injury
#16
Marcio B Ferrari, Jorge Chahla, Justin J Mitchell, Gilbert Moatshe, Jacob D Mikula, Daniel Cole Marchetti, Robert F LaPrade
Multiple ligament knee injuries are complex pathologies that often result from traumatic knee dislocations. Both a high level of suspicion and a thorough clinical and radiographic examination are mandatory to diagnose and identify all injured structures. Reconstruction of all injured ligaments is recommended to aid in early mobilization and to avoid joint stiffness or graft failure. For knee dislocations involving injury to the anterior cruciate ligament, posterior cruciate ligament, and medial-sided structures, a repair and augmentation of the medial collateral ligament, together with an anatomic reconstruction of the anterior cruciate ligament and double-bundle posterior cruciate ligament, is recommended...
April 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28577891/treatment-of-posterior-cruciate-ligament-tibial-avulsion-by-a-minimally-invasive-open-posterior-approach
#17
Ahmed Abdelbadie Abdallah, Mohammed S Arafa
OBJECTIVE: To assess the surgical technique and report the outcomes following fixation of PCL bony avulsions through mini-invasive posterior knee approach as described by Burks and Schaffer. METHODS: From June 2012 to July 2015, 27 patients enrolled in the study (21 males and 6 females). Fixation of tibial PCL avulsion fractures was done with one or two cannulated screws, or sutures through Burks and Schaffer's approach. The mean interval before surgery was 16days (1-70) ...
May 26, 2017: Injury
https://www.readbyqxmd.com/read/28573973/knee-flexion-with-quadriceps-cocontraction-a-new-therapeutic-exercise-for-the-early-stage-of-acl-rehabilitation
#18
Andrea Biscarini, Samuele Contemori, Daniele Busti, Fabio M Botti, Vito E Pettorossi
Quadriceps strengthening exercises designed for the early phase of anterior cruciate ligament (ACL) rehabilitation should limit the anterior tibial translation developed by quadriceps contraction near full knee extension, in order to avoid excessive strain on the healing tissue. We hypothesize that knee-flexion exercises with simultaneous voluntary contraction of quadriceps (voluntary quadriceps cocontraction) can yield considerable levels of quadriceps activation while preventing the tibia from translating forward relative to the femur...
December 8, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/28567428/acl-roof-impingement-revisited-does-the-independent-femoral-drilling-technique-avoid-roof-impingement-with-anteriorly-placed-tibial-tunnels
#19
John A Tanksley, Brian C Werner, Evan J Conte, David P Lustenberger, M Tyrrell Burrus, Stephen F Brockmeier, F Winston Gwathmey, Mark D Miller
BACKGROUND: Anatomic femoral tunnel placement for single-bundle anterior cruciate ligament (ACL) reconstruction is now well accepted. The ideal location for the tibial tunnel has not been studied extensively, although some biomechanical and clinical studies suggest that placement of the tibial tunnel in the anterior part of the ACL tibial attachment site may be desirable. However, the concern for intercondylar roof impingement has tempered enthusiasm for anterior tibial tunnel placement...
May 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28567427/medial-collateral-ligament-reconstruction-in-patients-with-medial-knee-instability-a-systematic-review
#20
REVIEW
Antonios N Varelas, Brandon J Erickson, Gregory L Cvetanovich, Bernard R Bach
BACKGROUND: The medial collateral ligament (MCL) is the most frequently injured ligament of the knee, but it infrequently requires surgical treatment. Current literature on MCL reconstructions is sparse and offers mixed outcome measures. PURPOSE/HYPOTHESIS: The purpose of this study was to compare the outcomes of isolated MCL reconstruction and multiligamentous MCL reconstruction. Our hypothesis was that in selective patients, MCL reconstruction would significantly improve objective and subjective patient knee performance measures, those being baseline valgus laxity, range of motion, objective and subjective International Knee Documentation Committee (IKDC) scores, Tegner score, and Lysholm knee activity scores...
May 2017: Orthopaedic Journal of Sports Medicine
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