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https://www.readbyqxmd.com/read/28721459/measurement-of-lower-limb-alignment-there-are-within-person-differences-between-weight-bearing-and-non-weight-bearing-measurement-modalities
#1
Daphne A L Schoenmakers, Peter Z Feczko, Bert Boonen, Martijn G M Schotanus, Nanne P Kort, Pieter J Emans
PURPOSE: Previous studies have compared weight-bearing mechanical leg axis (MLA) measurements to non-weight-bearing measurement modalities. Most of these studies compared mean or median values and did not analyse within-person differences between measurements. This study evaluates the within-person agreement of MLA measurements between weight-bearing full-length radiographs (FLR) and non-weight-bearing measurement modalities (computer-assisted surgery (CAS) navigation or MRI). MATERIALS AND METHODS: Two independent observers measured the MLA on pre- and postoperative weight-bearing FLR in 168 patients...
July 18, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28717621/effects-of-the-menstrual-cycle-on-lower-limb-biomechanics-neuromuscular-control-and-anterior-cruciate-ligament-injury-risk-a-systematic-review
#2
REVIEW
Vivek Balachandar, Jan-Luigi Marciniak, Owen Wall, Chandrika Balachandar
OBJECTIVE: Anterior cruciate ligament (ACL) injury has a devastating impact on physical and psychological disability. Rates of ACL rupture are significantly greater in females than males during the same sports. Hormonal mechanisms have been proposed but are complex and poorly understood. This systematic review evaluates the effects of menstrual cycle on: 1) lower-limb biomechanics, 2) neuromuscular control, and 3) ACL injury risk. METHODS: The MEDLINE, CINAHL, SPORTSDiscus, Web of Science, and Google Scholar databases were searched from inception to August 2016 for studies investigating the effects of the menstrual cycle on lower-limb biomechanics, neuromuscular control, and ACL injury risk in females...
January 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/28706440/reliability-of-an-integrated-ultrasound-and-stereophotogrammetric-system-for-lower-limb-anatomical-characterisation
#3
Frederick Greatrex, Erica Montefiori, Thomas Grupp, Josef Kozak, Claudia Mazzà
BACKGROUND: Lower extremity analysis for preoperative total knee and hip arthroplasty routines can increase surgery success rate and hence reduce associated costs. Current tools are limited by being invasive, limited to supine analysis, or too expensive. This study aimed to propose and validate a device, OrthoPilot®, based on the combined use of a stereophotogrammetric and ultrasound system which can in vivo and noninvasively measure varus/valgus, flexion/extension, femur and tibia torsion, and femur and tibia lengths...
2017: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/28701852/encouraging-treatment-algorithm-for-computer-assisted-navigated-total-knee-arthroplasty-tka-a-retrospective-cohort-analysis
#4
J Cip, M Widemschek, C Bach, P Ruckenstuhl, T Benesch, K Studer, A Martin
OBJECTIVE: Navigated computer-assisted total knee arthroplasty (TKA) shows inconclusive mid- to long-term outcome results and is limited by increased costs, surgery-time and an additional learning curve. We introduced a treatment algorithm preserving computer-assisted TKA for patients with adipositas-per-magna, posttraumatic leg-deformities, osteosynthetic material in-situ or reduced preoperative X-ray quality. METHODS: 237 primary unilateral TKA were allocated based on the treatment concept described above...
September 2017: Journal of Orthopaedics
https://www.readbyqxmd.com/read/28690462/open-wedge-distal-femoral-osteotomy-accuracy-of-correction-and-patient-outcomes
#5
Osama Elattar, Ishaan Swarup, Aaron Lam, Joseph Nguyen, Austin Fragomen, S Robert Rozbruch
BACKGROUND: There is a renewed interest in joint preservation surgery, and lateral opening wedge distal femoral osteotomy (DFO), a joint-preserving procedure, has been used to treat symptomatic genu valgum when the deformity originates in the distal femur. QUESTIONS/PURPOSES: This study aimed to measure the accuracy of lateral opening wedge DFO in achieving deformity correction using radiographic parameters. In addition, the ability of lateral opening wedge DFO to improve patient outcomes as measured by Short Form Health Survey (SF-36) scores and American Academy of Orthopedic Surgeons (AAOS) lower limb module (LLM) scores leading to successful joint preservation was assessed...
July 2017: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
https://www.readbyqxmd.com/read/28684111/frontal-alignment-in-total-knee-arthroplasty-comparative-study-between-radiographic-measurement-and-surgical-navigation
#6
D Hernandez-Vaquero, A Noriega-Fernandez, A Suarez-Vazquez, S Roncero-Gonzalez, A A Sierra-Pereira, L Gil-Martinez, J M Fernandez-Carreira
OBJECTIVE: To establish the concordance between angulation of the femoro-tibial mechanical axis measured with x-rays and surgical navigation in both the pre and postoperative period after a total knee arthroplasty (TKA) was implanted. MATERIAL AND METHOD: Pre and postoperative measurements were analyzed in 88 TKA of the same model and all performed with the same surgical navigation system. The mechanical frontal angle (MFA) and femoro-tibial anatomic angle were measured before and after the TKA...
July 3, 2017: Revista Española de Cirugía Ortopédica y Traumatología
https://www.readbyqxmd.com/read/28683233/development-of-a-clinician-rated-drop-vertical-jump-scale-for-patients-undergoing-rehabilitation-after-acl-reconstruction-a-delphi-approach
#7
Sheila S Gagnon, Trevor B Birmingham, Bert M Chesworth, Dianne Bryant, Melanie Werstine, J Robert Giffin
Study Design Delphi panel study. Background Biomechanical parameters measured during a drop vertical jump task are risk factors for anterior cruciate ligament (ACL) injury and are targeted during rehabilitation after ACL reconstruction. A clinically feasible tool that quantifies observed performance on the drop vertical jump would help inform treatment efforts. The content and scoring of such a tool should be deliberated upon by a group of experts throughout its development. Objectives To establish consensus on the content and scoring on a Clinician-Rated Drop Vertical Jump Scale (DVJS) for use during rehabilitation after ACL reconstruction...
July 6, 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/28677074/the-measurement-of-medial-knee-gap-width-using-ultrasound
#8
Laura C Slane, Josh A Slane, Lennart Scheys
INTRODUCTION: Medial knee instability is a key clinical parameter for assessing ligament injury and arthroplasty success, but current methods for measuring stability are typically either qualitative or involve ionizing radiation. The purpose of this study was to perform a preliminary analysis of whether ultrasound (US) could be used as an alternate approach for quantifying medial instability by comparing an US method with an approach mimicking the current gold standard fluoroscopy method...
August 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28663394/external-rotation-of-the-femoral-component-increases-asymmetry-of-the-posterior-condyles
#9
M P Bonnin, M Saffarini, L Nover, J van der Maas, C Haeberle, G Hannink, J Victor
AIMS: The morphometry of the distal femur was largely studied to improve bone-implant fit in total knee arthroplasty (TKA), but little is known about the asymmetry of the posterior condyles. This study aimed to investigate the dimensions of the posterior condyles and the influence of externally rotating the femoral component on potential prosthetic overhang or under-coverage. PATIENTS AND METHODS: We analysed the shape of 110 arthritic knees at the time of primary TKA using pre-operative CT scans...
July 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28660229/lateral-meniscus-posterior-root-and-meniscofemoral-ligaments-as-stabilizing-structures-in-the-acl-deficient-knee-a-biomechanical-study
#10
Jonathan M Frank, Gilbert Moatshe, Alex W Brady, Grant J Dornan, Ashley Coggins, Kyle J Muckenhirn, Erik L Slette, Jacob D Mikula, Robert F LaPrade
BACKGROUND: The biomechanical effects of lateral meniscal posterior root tears with and without meniscofemoral ligament (MFL) tears in anterior cruciate ligament (ACL)-deficient knees have not been studied in detail. PURPOSE: To determine the biomechanical effects of the lateral meniscus (LM) posterior root tear in ACL-intact and ACL-deficient knees. In addition, the biomechanical effects of disrupting the MFLs in ACL-deficient knees with meniscal root tears were evaluated...
June 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28660000/coronal-knee-alignment-40-years-after-total-meniscectomy-in-adolescents-a-prospective-cohort-study
#11
I P Pengas, W Nash, Wasim Khan, A Assiotis, J Banks, M J McNicholas
INTRODUCTION: Meniscectomies result in altered knee biomechanics and increase contact forces on the operated knee joint. METHODS: We assessed coronal knee alignment in relation to radiological osteoarthritis grading, clinical range of movement and patient reported outcome measures 40 years after total open meniscectomies in adolescence. Thirty eight knees (30 patients) that underwent total open meniscectomy were assessed on standardised weight-bearing anteroposterior radiographs for deviation from 'physiological valgus angle' in either direction (magnitude of malalignment)...
2017: Open Orthopaedics Journal
https://www.readbyqxmd.com/read/28657572/varus-valgus-constrained-implants-in-total-knee-arthroplasty-indications-and-technique
#12
Paolo Adravanti, Sebastiano Vasta
Total knee arthroplasty is a successful operation that significantly improves patient's quality of life. However, studies demonstrated as only 82% to 89% of patients are satisfied with their surgery, being the other disappointed with regard to their expectations. Two to 5.7% of total knee arthroplasties (TKAs) require revision within 5 years. Both complex primary cases and revision TKA often necessitate for a higher degree of constrain than cruciate retaining or postero-stabilized implant design. In the 1970s varus-valgus constrained (VVC) or semi-constrained implants have been developed by Insall and associates from the PS design, which provide varus-valgus stability preserving a fair amount of host bone...
June 7, 2017: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/28657565/robotic-arm-assisted-partial-knee-arthroplasty-a-single-centre-experience
#13
Andrea Marcovigi, Francesco Zambianchi, Dario Sandoni, Elisa Rivi, Fabio Catani
BACKGROUND AND AIM OF THE WORK: UKA has proven to be an effective surgical procedure, but its survivorship is still negatively affected by inaccuracy in component component positioning, implant and limb alignment. Robotic surgery has been introduced in order to minimize such technical errors. The aim of the present paper was to evaluate clinical and surgical outcomes after a 3 years' experience of robotic assisted UKA with the Mako Robotic Arm. METHODS: Seventy-three patients undergoing  UKA with robotic instrumentation (65 medial UKAs, 8 lateral UKAs) and with a clinical follow-up of 3 -37 months were included in the present study...
June 7, 2017: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/28657562/patient-specific-instrumentation-in-total-knee-arthroplasty
#14
Andrea Colombelli, Alberto Belluati, Yousef Rizqallah, Giovanni Guerra, Carlo Busatto
BACKGROUND AND AIM OF THE WORK: The international literature and analysis of the prosthetic registers highlight a significant relationship between the alignment of the components and the survival of prosthetic implants of the knee. The patient specific instrumentation (PSI) technology exploits the data obtained with the MRN for the production of cutting blocks (CB) useful to a TKA. Revisiting the recent international literature, comparing the results of the conventional method and PSI, numerous studies confirm a statistically significant difference of inliers (± 3 degrees) for HKA...
June 7, 2017: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/28656567/varus-valgus-instability-in-the-anterior-cruciate-ligament-deficient-knee-effect-of-posterior-tibial-load
#15
Tomoki Ohori, Tatsuo Mae, Konsei Shino, Yuta Tachibana, Hiromichi Fujie, Hideki Yoshikawa, Ken Nakata
BACKGROUND: Anterior cruciate ligament (ACL) injury is often accompanied with medial collateral ligament (MCL) injury. Assessment of varus-valgus (V-V) instability in the ACL-deficient knee is crucial for the management of the concomitant ACL-collateral ligaments injury. We evaluated the V-V laxity and investigated the effect of additional posterior tibial load on the laxity in the ACL-deficient knee. Our hypothesis was that the V-V laxity in the ACL-deficient knee was greater than that in the intact knee and attenuated by additional posterior tibial load...
December 2017: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/28656531/acl-injury-prevention-what-does-research-tell-us
#16
REVIEW
Trent Nessler, Linda Denney, Justin Sampley
PURPOSE OF REVIEW: Mechanisms leading to anterior cruciate ligament (ACL) injury have been identified, yet re-injury or a secondary injury persists in the athletic population. The purpose of this review is to identify risk factors associated with ACL injury and investigate programs to prevent injury. RECENT FINDINGS: Faulty mechanics during dynamic movement that cause excessive valgus force at the knee increases the risk of ACL injury. Faulty mechanics may be a result of lateral displacement of the trunk, unequal limb loading, and lack of control to avoid the valgus knee position...
June 27, 2017: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/28653182/coronal-femoral-tka-position-significantly-influences-in-vivo-patellar-loading-in-unresurfaced-patellae-after-primary-total-knee-arthroplasty
#17
Omer Slevin, Florian A Schmid, Filippo-Franco Schiapparelli, Helmut Rasch, Felix Amsler, Michael T Hirschmann
PURPOSE: As patellar tracking and loading is influenced by tibial tuberosity and trochlear groove (TT-TG) distance, patellar height, thickness and tilt as well as TKA component position, it was our hypothesis that these parameters significantly correlate with patellar BTU intensity and localization in SPECT/CT. The purpose of the study was to investigate whether TKA component position as well as the height, thickness and tilt of the unresurfaced patella influences the intensity and the distribution pattern of BTU in SPECT/CT...
June 26, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28652829/patellofemoral-pain-in-athletes
#18
REVIEW
Wolf Petersen, Ingo Rembitzki, Christian Liebau
Patellofemoral pain (PFP) is a frequent cause of anterior knee pain in athletes, which affects patients with and without structural patellofemoral joint (PFJ) damage. Most younger patients do not have any structural changes to the PFJ, such as an increased Q angle and a cartilage damage. This clinical entity is known as patellofemoral pain syndrome (PFPS). Older patients usually present with signs of patellofemoral osteoarthritis (PFOA). A key factor in PFPS development is dynamic valgus of the lower extremity, which leads to lateral patellar maltracking...
2017: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/28651635/an-anatomical-like-triangular-vector-ligament-reconstruction-for-the-medial-collateral-ligament-and-the-posterior-oblique-ligament-injury-with-single-femoral-tunnel-a-retrospective-study
#19
Hongtao Xu, Kai Kang, Jian Zhang, Dongmei Xin, Wei Liu, Guorong Jin, Jiangtao Dong, Shijun Gao
BACKGROUND: The purpose of this study was to evaluate the clinical outcomes of anatomical-like triangular-vector ligament reconstruction (TLR) in treating the combined injury of medial collateral ligament (MCL) and posterior oblique ligament (POL). METHODS: During July 2013 to May 2014, 26 patients who received anatomical-like TLR were included into this study. All patients received clinical physical examination, imaging examination, and knee joint function score both preoperative and follow-up...
June 26, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28651579/total-knee-arthroplasty-with-corrective-osteotomy-for-knee-osteoarthritis-associated-with-malunion-after-tibial-plateau-fracture-a-case-report
#20
Toshihiro Hosokawa, Yuji Arai, Shuji Nakagawa, Toshikazu Kubo
BACKGROUND: When surgeons perform total knee arthroplasty in patients with knee osteoarthritis due to malunion following fractures around the knee joint, corrective osteotomy is recommended for severe deformities. Most such deformities are coronal plane varus or valgus deformities, and reports of sagittal plane flexion or extension deformities are rare. We describe a case in which a one-stage total knee arthroplasty was performed with extension corrective osteotomy in the sagittal plane...
June 26, 2017: BMC Research Notes
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