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https://www.readbyqxmd.com/read/29108731/ratio-of-the-tibial-tuberosity-trochlear-groove-distance-to-the-tibial-maximal-mediolateral-axis-a-more-reliable-and-standardized-way-to-measure-the-tibial-tuberosity-trochlear-groove-distance
#1
Pengkai Cao, Yingzhen Niu, Chang Liu, Xiaomeng Wang, Guman Duan, Qinghua Mu, Xintong Luo, Fei Wang
BACKGROUND: Tibial tuberosity-trochlear groove distance(TT-TG) is a measurement to assist in the diagnosis and treatment of patellar instability, however it still has some limitations. Our study was to modify the accepted measurement method and seek a more reliable and standardized method. METHODS: The data of 65 healthy controls and 49 patients with bilateral patellar instability from 2010 to 2016 were collected and analyzed by CT. The TT-TG, tibial maximal mediolateral axis (MML), and their ratio [i...
November 3, 2017: Knee
https://www.readbyqxmd.com/read/29046242/preoperative-corrections-are-required-for-planning-of-patient-specific-instrumentation-in-total-knee-arthroplasty
#2
Yohei Okada, Atsushi Teramoto, Tomoyuki Suzuki, Yuichiro Kii, Kota Watanabe, Toshihiko Yamashita
BACKGROUND: Patient-specific instrumentation (PSI) is attracting attention as a mechanical method of ensuring the accuracy of osteotomy during total knee arthroplasty (TKA). Few studies have focused on preoperative plans; thus, it is unclear how often initial plans have to be corrected preoperatively and intraoperatively. We investigated the frequency of corrections, the accuracy of intraoperative osteotomy, and postoperative alignment. METHODS: We analyzed 45 knees of 40 patients who underwent TKA using magnetic resonance imaging (MRI)-based PSI...
October 15, 2017: Knee
https://www.readbyqxmd.com/read/29037743/the-effect-of-platelet-rich-fibrin-on-autologous-osteochondral-transplantation-an-in-vivo-porcine-model
#3
S Y Sheu, C H Wang, Y H Pao, Y T Fu, C H Liu, C H Yao, T F Kuo
BACKGROUND: This work aimed to evaluate the efficacy of cartilage transplantation to the medial femoral condyle±platelet-rich fibrin (PRF) augmentation in a porcine model. The hypothesis of the study was that PRF may act as a bioactive cell scaffold to fill defects and enhance cartilage regeneration. METHODS: Thirty-two knees of 16 miniature pigs were randomly assigned to four groups. The critical-size osteochondral defects (8x5mm) in femoral condyle of both knees were treated with one of the following: group 1-untreated controls; group 2-cartilage fragments alone; group 3-PRF alone; group 4-PRFT+cartilage fragments...
October 13, 2017: Knee
https://www.readbyqxmd.com/read/29033262/primary-stability-of-different-plate-positions-and-the-role-of-bone-substitute-in-open-wedge-high-tibial-osteotomy
#4
Ryohei Takeuchi, Jung Woon-Hwa, Hiroyuki Ishikawa, Yuichiro Yamaguchi, Katsunari Osawa, Yasushi Akamatsu, Koichi Kuroda
BACKGROUND: The purpose of this study was to compare the mechanical fixation strengths of anteromedial and medial plate positions in osteotomy, and clarify the effects of bone substitute placement into the osteotomy site. METHODS: Twenty-eight sawbone tibia models were used. Four different models were prepared: Group A, the osteotomy site was open and the plate position was anteromedial; Group B, bone substitutes were inserted into the osteotomy site and the plate position was anteromedial; Group C, the osteotomy site was open and the plate position was medial; and Group D, bone substitutes were inserted into the osteotomy site and the plate position was medial...
October 12, 2017: Knee
https://www.readbyqxmd.com/read/29021089/patellofemoral-arthritis-treated-with-resurfacing-implant-clinical-outcome-and-complications-at-a-minimum-two-year-follow-up
#5
Juan Pablo Zicaro, Carlos Yacuzzi, Juan Astoul Bonorino, Lisandro Carbo, Matias Costa-Paz
BACKGROUND: This study evaluated the clinical and radiographic outcomes of a series of patients treated with an anatomic inlay resurfacing implant, with a minimum two-year follow-up. METHODS: Fifteen patients underwent patellofemoral-resurfacing procedures using a HemiCAP Wave Patellofemoral Inlay Resurfacing implant from 2010 to 2013. Clinical outcomes included: Visual Analog Scale (VAS), Lysholm score, Knee Society Score (KSS), and evaluation of Kujala, and Hospital for Special Surgery Patellofemoral score (HSS-PF)...
October 8, 2017: Knee
https://www.readbyqxmd.com/read/28978462/sex-specific-kinetic-and-kinematic-indicators-of-medial-tibiofemoral-force-during-walking-and-running
#6
Jean-Francois Esculier, Richard W Willy, Michael W Baggaley, Stacey A Meardon, John D Willson
BACKGROUND: Our aims were to (1) Evaluate sex-specific contributions of peak knee flexion moment (pKFM) and peak knee adduction moment (pKAM) in medial tibiofemoral joint (TFJ) force during walking and running; (2) identify kinematic variables to estimate peak medial TFJ force. METHODS: Eighty-seven runners participated (36 females, 51 males; age=23.0±3.8years (1 standard deviation)). Kinematics and kinetics data were collected during treadmill walking (1.3m/s) and running (3...
October 1, 2017: Knee
https://www.readbyqxmd.com/read/28978461/the-accuracy-of-the-projected-surgical-transepicondylar-axis-relative-to-the-true-surgical-transepicondylar-axis-in-total-knee-arthroplasty
#7
Takaaki Ohmori, Tamon Kabata, Yoshitomo Kajino, Tadashi Taga, Kazuhiro Hasegawa, Daisuke Inoue, Takashi Yamamoto, Tomoharu Takagi, Junya Yoshitani, Takuro Ueno, Tomohiro Ojima, Hiroyuki Tsuchiya
BACKGROUND: In TKA, we have used the "projected SEA", which is obtained by projecting the "true SEA" on the distal femoral cutting plane in clinical practice to determine the femoral component rotation. There are no reports examining the accuracy of the "projected SEA". In this study, we investigated the difference between the "true SEA" and "projected SEA". METHODS: The present study was a CT-based computer-simulated case series. We evaluated 34 knees without osteoarthritis changes...
October 1, 2017: Knee
https://www.readbyqxmd.com/read/28978460/three-dimensional-printed-patient-specific-cutting-guides-for-femoral-varization-osteotomy-do-it-yourself
#8
Juan Arnal-Burró, Rubén Pérez-Mañanes, Eudaldo Gallo-Del-Valle, Cristina Igualada-Blazquez, Manuel Cuervas-Mons, Javier Vaquero-Martín
INTRODUCTION: In valgus knees of young patients, opening-wedge distal femoral osteotomy is a valid treatment option for axial corrections. It allows the surgeon to achieve accurate correction, which is directly related to the functional outcome and survivorship of the osteotomy. This study presents a new technique based on three-dimensional (3D)-printed cutting guides for opening-wedge distal femoral osteotomies, in which pre-operative planning and intraoperative executional accuracy play a major role...
October 1, 2017: Knee
https://www.readbyqxmd.com/read/28978459/influence-of-knee-flexion-angle-and-transverse-drill-angle-on-creation-of-femoral-tunnels-in-double-bundle-anterior-cruciate-ligament-reconstruction-using-the-transportal-technique-three-dimensional-computed-tomography-simulation-analysis
#9
Chong Hyuk Choi, Sung-Jae Kim, Yong-Min Chun, Sung-Hwan Kim, Su-Keon Lee, Nam-Kyu Eom, Min Jung
BACKGROUND: The purpose of this study was to find appropriate flexion angle and transverse drill angle for optimal femoral tunnels of anteromedial (AM) bundle and posterolateral (PL) bundle in double-bundle ACL reconstruction using transportal technique. METHODS: Thirty three-dimensional knee models were reconstructed. Knee flexion angles were altered from 100° to 130° at intervals of 10°. Maximum transverse drill angle (MTA), MTA minus 10° and 20° were set up...
October 1, 2017: Knee
https://www.readbyqxmd.com/read/28974403/cementing-technique-affects-the-rate-of-femoral-component-loosening-after-high-flexion-total-knee-arthroplasty
#10
Hyuk-Soo Han, Myung Chul Lee
BACKGROUND: The purpose of this study was to determine the effects of different cementing techniques on the rate of early femoral loosening of high-flexion total knee arthroplasties (TKAs). METHODS: A total of 734 knees from 486 patients treated with high-flexion design TKA between July 2001 and July 2010 were divided into two groups based on the cementing technique used. For 403 knees (group N), cement was applied onto the distal and anterior cut surfaces of the femur and the posterior flanges of the femoral component without pressurization...
September 30, 2017: Knee
https://www.readbyqxmd.com/read/28974402/up-to-10-year-follow-up-of-the-oxford-domed-lateral-partial-knee-replacement-from-an-independent-centre
#11
Simon D S Newman, Altay Altuntas, Helen Alsop, Justin P Cobb
BACKGROUND: The Oxford Domed Lateral Partial Knee Replacement (ODLPKR) was designed specifically for the lateral compartment in response to the unacceptable dislocation rate seen with the Oxford Partial Knee. This paper presents the up to 10-year follow-up of an independent, single surgeon series using this implant. The aim of this study is to assess the medium term outcome of the ODLPKR. The primary outcome measures were 13 revision surgery, re-operation and functional outcome. METHODS: Sixty-four knees in 58 patients were performed between 2005 and 2009...
September 30, 2017: Knee
https://www.readbyqxmd.com/read/28974401/the-failing-medial-compartment-in-the-varus-knee-and-its-association-with-cam-deformity-of-the-hip
#12
Jonathan S Palmer, Antony J Palmer, Luke D Jones, Sujin Kang, Nicholas Bottomley, William M Jackson, A Paul Monk, David J Beard, Kassim Javaid, Sion Glyn-Jones, Andrew J Price
BACKGROUND: Since 2011, the knee service at the Nuffield Orthopaedic Centre has been offering a neutralising medial opening wedge high tibial osteotomy (HTO) to a specific group of patients with genu varum and early knee osteoarthritis. An observation was made concerning this group of patients and the presence of CAM deformity at the hip. The aim of this study is to establish whether or not any association exists between the OA phenotype shared by our HTO group and the incidence of CAM deformity at the hip...
September 30, 2017: Knee
https://www.readbyqxmd.com/read/28974400/the-effect-of-knee-flexor-and-extensor-fatigue-on-shock-absorption-during-cutting-movements-after-a-jump-landing
#13
Youkyung Kim, Changhong Youm, Minji Son, Jinhee Kim, Myeounggon Lee
BACKGROUND: Sporting situations include instances of continuous and/or integrated movements. However, the effect of fatigue on the performance of these movements remains unclear. PURPOSE: To investigate the effect of knee flexor and extensor fatigue on the shock absorption strategy of the lower limb during cutting movements performed after jump landings. METHODS: Twenty-four healthy participants performed cutting movements following jump landings from two heights - 30cm and 40cm - and under three levels of lower limb fatigue: pre-fatigue (100% peak knee extension torque), and post-fatigue 50% (post-50%) and 30% (post-30%) peak knee extension torque...
September 30, 2017: Knee
https://www.readbyqxmd.com/read/28974399/perioperative-comparison-of-blood-loss-and-complications-between-simultaneous-bilateral-and-unilateral-total-knee-arthroplasty-for-knee-osteoarthritis
#14
Yongjian Qi, Kai Tie, Hua Wang, Zhengqi Pan, Xinyu Zhao, Heqiang Chen, Liaobin Chen
OBJECTIVE: This study aimed to compare the blood loss and complications between simultaneous bilateral total knee arthroplasty (SBTKA) and unilateral total knee arthroplasty (UTKA). METHODS: This study included 54 SBTKAs and 70 UTKAs performed between 2013 and 2014. Groups were compared with respect to blood loss, hemoglobin, hematocrit, D-dimer, blood transfusion, and complications. RESULTS: Hemoglobin between the groups was not significantly different (P>0...
September 30, 2017: Knee
https://www.readbyqxmd.com/read/28974398/differences-in-patellofemoral-alignment-as-a-result-of-patellar-shape-in-cruciate-retaining-total-knee-arthroplasty-without-patellar-resurfacing-at-a-minimum-three-year-follow-up
#15
Atsuo Inoue, Yuji Arai, Shuji Nakagawa, Hiroaki Inoue, Yasushi Yoshihara, Shouichi Yamazoe, Toshikazu Kubo
BACKGROUND: Although the patellofemoral (PF) joint shape of the femoral implant in a particular prosthetic design is identical, the articular surface shape of the patella varies between individuals. The present study investigated the effects of patellar shape on the postoperative PF joint in a cruciate-retaining total knee arthroplasty (CR-TKA) without patellar resurfacing and with at least three years of follow-up. METHODS: This study investigated 76 knees of 62 patients who underwent CR-TKA without patellar resurfacing for varus osteoarthritis...
September 30, 2017: Knee
https://www.readbyqxmd.com/read/28970127/relationships-of-hamstring-muscle-volumes-to-lateral-tibial-slope
#16
Randy J Schmitz, Anthony S Kulas, Sandra J Shultz, Justin P Waxman, Hsin-Min Wang, Robert A Kraft
BACKGROUND: Greater posterior-inferior directed slope of the lateral tibial plateau (LTS) has been demonstrated to be a prospective ACL injury risk factor. Trainable measures to overcome a greater LTS need to be identified for optimizing injury prevention protocols. It was hypothesized that Healthy individuals with greater LTS who have not sustained an ACL injury would have a larger lateral hamstring volume. METHODS: Eleven healthy females (mean +/- standard deviation) (1...
September 29, 2017: Knee
https://www.readbyqxmd.com/read/28970126/columbus%C3%A2-computer-navigated-total-knee-arthroplasty-gap-balancing-versus-measured-resection
#17
N D Clement, N Makaram, J Bell, C H Tiemessen, S A Mehdi, S J Livingston
BACKGROUND: The aim of this study was to compare the medium term functional outcome and patient satisfaction of gap balanced (GB) with measured resection (MR) total knee arthroplasty (TKA) using computer navigation. METHODS: A cohort of 144 consecutive computer navigated TKA were retrospectively identified from an arthroplasty database. Functional assessment using the Oxford Knee Score (OKS) and patient satisfaction were obtained from 113 patients at a mean follow-up of 5...
September 29, 2017: Knee
https://www.readbyqxmd.com/read/28970125/medial-rather-than-lateral-knee-instability-correlates-with-inferior-patient-satisfaction-and-knee-function-after-total-knee-arthroplasty
#18
Hiroyuki Tsukiyama, Shinichi Kuriyama, Masahiko Kobayashi, Shinichiro Nakamura, Moritoshi Furu, Hiromu Ito, Shuichi Matsuda
BACKGROUND: It is commonly thought that balanced medial and lateral tibiofemoral joint gaps are essential, but the effect of joint laxity on clinical outcome after total knee arthroplasty (TKA) is unclear. It was hypothesised that medial joint laxity correlates with inferior patient satisfaction and knee function, although lateral joint laxity is allowed to a certain degree in TKA. METHODS: This study included 50 knees that underwent primary TKA. Knee laxity was measured with postoperative stress radiographs in flexion and extension, and patient satisfaction and knee function were evaluated by the 2011 Knee Society Knee Scoring System...
September 29, 2017: Knee
https://www.readbyqxmd.com/read/28970124/effects-of-toe-in-and-toe-in-with-wider-step-width-on-level-walking-knee-biomechanics-in-varus-valgus-and-neutral-knee-alignments
#19
Hunter J Bennett, Guangping Shen, Harold E Cates, Songning Zhang
BACKGROUND: Increased peak external knee adduction moments exist for individuals with knee osteoarthritis and varus knee alignments, compared to healthy and neutrally aligned counterparts. Walking with increased toe-in or increased step width have been individually utilized to successfully reduce 1st and 2nd peak knee adduction moments, respectfully, but have not previously been combined or tested among all alignment groups. The purpose of this study was to compare toe-in only and toe-in with wider step width gait modifications in individuals with neutral, valgus, and varus alignments...
September 29, 2017: Knee
https://www.readbyqxmd.com/read/28970123/knee-instability-as-the-primary-cause-of-failure-following-total-knee-arthroplasty-tka-a-systematic-review-on-the-patient-surgical-and-implant-characteristics-of-revised-tka-patients
#20
Christopher J Wilson, Annika Theodoulou, Raechel A Damarell, Jeganath Krishnan
BACKGROUND: The aim of this review was to systematically assess the current evidence available regarding knee instability after TKA to identify time to failure between primary and revision TKA. In addition, we considered the patient, surgical and implant characteristics of primary TKA patients revised for knee instability, and investigated methods used for knee instability diagnosis. METHODS: A systematic search of six databases and the unpublished literature was performed...
September 29, 2017: Knee
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