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J Craig Garrison, Joseph Hannon, Shiho Goto, Laura Giesler, Curtis Bush, James M Bothwell
BACKGROUND: The purpose of this study was to compare hip and knee energy absorption contribution (EAC) during a double limb squat (DLS) and quadriceps strength in patients three months post-operative ACL-R versus matched healthy controls. METHODS: Twenty-four ACL-R participants (Age = 15.5 ± 1.3 yrs; Ht = 1.66 ± .07 m; Mass = 66.3 ± 15.5 kg) were compared to 24 age, sex, limb, and activity-matched healthy controls (Age = 15.5 ± 1...
July 9, 2018: Knee
Geert Peersman, Josh Slane, Margo Dirckx, Arne Vandevyver, Philipp Dworschak, Thomas J Heyse, Lennart Scheys
No abstract text is available yet for this article.
July 9, 2018: Knee
S G F Abram, D J Beard, A J Price
BACKGROUND: The aim of this study was to deliver standardised terminology for the identification and stratification of patients with meniscal lesions of the knee. METHODS: A national group of expert surgeons was convened by the British Association for Surgery of the Knee (BASK) and a formal consensus process was undertaken following a validated methodology. A combination of nominal group techniques and an iterative Delphi process was used to develop and refine relevant definitions...
July 5, 2018: Knee
T X Haen, P Boisrenoult, C Steltzlen, N Pujol
BACKGROUND: Accuracy of meniscal sizing is an important issue before allograft transplantation. To date, there is no consensus on the best imaging method. The purpose of this study was to compare plain radiographs, magnetic resonance imaging (MRI) and computed tomography (CT) arthrography in the assessment of meniscal size. We hypothesized that MRI and CT arthrography had better correlations than plain radiographs. METHODS: All patients operated on by meniscal allograft between January 2005 and May 2015 were screened...
July 3, 2018: Knee
Kyoung-Tak Kang, Sae Kwang Kwon, Juhyun Son, Oh-Ryong Kwon, Jun-Sang Lee, Yong-Gon Koh
BACKGROUND: Postoperative changes of the femoral posterior condylar offset (PCO) and posterior tibial slope (PTS) affect the biomechanics of the knee joint after fixed-bearing total knee arthroplasty (TKA). However, the biomechanics of mobile-bearing is not well known. Therefore, the aim of this study was to investigate whether alterations to the PCO and PTS affect the biomechanics for mobile-bearing TKA. METHODS: We used a computational model for a knee joint that was validated using in vivo experiment data to evaluate the effects of the PCO and PTS on the tibiofemoral (TF) joint kinematics, patellofemoral (PF) contact stress, collateral ligament force and quadriceps force, for mobile-bearing TKA...
July 3, 2018: Knee
Dawid Bączkowicz, Grzegorz Skiba, Marek Czerner, Edyta Majorczyk
BACKGROUND: Among the procedures for severe gonarthrosis, total knee arthroplasty (TKA) is considered a successful method patient satisfaction and functional improvement; however, TKA is commonly associated with incompletely recovered gait function. The aim of this study was to evaluate the influence of TKA and physiotherapy programmes on gait features and patient-reported functional status and the relationship between them, leading to broader knowledge of the origins of long-term gait disturbances...
June 22, 2018: Knee
Kazunori Hino, Tatsuhiko Kutsuna, Kunihiko Watamori, Yasumitsu Ishimaru, Hiroshi Kiyomatsu, Yoshitaka Shiraishi, Hiromasa Miura
BACKGROUND: Proper soft tissue balance is crucial for a successful clinical outcome after total knee arthroplasty (TKA). Bi-cruciate substituting (BCS)-TKA has been developed to more closely approximate normal knee characteristics. The purpose of the present study was to evaluate midflexion laxity before and after BCS-TKA using a navigation system, and assess the correlation between intraoperative laxity and the maximum flexion angle after surgery. METHODS: Fifty-one knees in 46 patients with osteoarthritis replaced with BCS prosthesis were assessed...
June 21, 2018: Knee
Dariusch Arbab, Pia Reimann, Martin Brucker, Bertil Bouillon, Christian Lüring
No abstract text is available yet for this article.
June 20, 2018: Knee
Mark A Kemp, Andrew J Metcalfe, Adrian Sayers, Vikki Wylde, Jonathan D Eldridge, Ashley W Blom
BACKGROUND: There is ongoing debate in the literature as to whether or not patellofemoral joint overstuffing has a clinically significant effect on postoperative outcomes following total knee arthroplasty (TKA). This study investigates the effect of patellofemoral joint overstuffing on patient-reported outcomes using novel methods of radiographic measurement. METHODS: The study population consisted of a prospective cohort of 266 patients receiving a Triathlon® (Stryker, Kalamazoo, MI, USA) TKA between 2006 and 2009...
June 20, 2018: Knee
R Richards, J C van den Noort, M van der Esch, M J Booij, J Harlaar
BACKGROUND: The knee adduction moment (KAM) is often elevated in medial knee osteoarthritis (KOA). The aim of this study was to evaluate effects on KAM and patient-reported outcomes of a six-week gait training program. METHODS: Twenty-one patients (61 ± 6 years) with KOA participated in a six-week biofeedback training program to encourage increased toe-in (all patients) and increased step-width (five patients). Patients received real-time visual feedback while walking on an instrumented treadmill...
June 20, 2018: Knee
Robert J P van der Wal, David Attia, Erwin H Waarsing, Bregje J W Thomassen, Ewoud R A van Arkel
BACKGROUND: The potential chondroprotective effect of meniscal allograft transplantation (MAT) is unclear. Subchondral bone mineral density (BMD) and subchondral bone remodeling play important roles in osteoarthritis development. Evaluation of subchondral BMD after MAT might give more insight into the potential chondroprotective effect. The purpose of this study was to determine early BMD changes in the knee after MAT. METHODS: Twenty-six consecutive patients underwent MAT during 2010-2013...
June 20, 2018: Knee
Grazia Pozzi, Asma'a Al-Mnayyis, Joan Almolla, Domenico Albano, Carmelo Messina, Ilaria Merli, Romeu Duarte Mesquita, Luca Maria Sconfienza
BACKGROUND: To demonstrate whether the distance between the middle point of the patellar tendon and posterior cruciate ligament (PT-PCL) calculated on a single axial MR image could be an alternative measure to tibial tubercle-PCL (TT-PCL) distance for TT lateralization without the need of imaging processing. To show that normalization of PT-PCL (nPT-PCL) against the maximum diameter of the tibial plateau may help to identify patients with patellar instability (PI). METHODS: MR scans of 30 patients (13 females, age 32 ± 13 years) with known PI and 60 patients (31 females, age 39 ± 19 years) with no history of PI were reviewed...
June 20, 2018: Knee
Young Gon Na, Beom Koo Lee, Do Hyun Hwang, Eun Seok Choi, Jae Ang Sim
BACKGROUND: Whether osteoarthritic patients with mild varus deformity can be indicated for high tibial osteotomy (HTO) is not established. We examined the preoperative characteristics and postoperative outcomes of HTO in patients with mild genu varum compared to patients with greater varus deformity. METHODS: Seventy-one patients who underwent HTO were included in this retrospective study. Patients were divided into either mild varus (MV, mechanical femorotibial angle (mFTA) ≤4°, n = 31 (44%)) and greater varus (GV, mFTA >4°, n = 40 (56%)) groups...
June 19, 2018: Knee
Vincent V G An, Yusuf Mirza, Evangelos Mazomenos, Francisco Vasconcelos, Danail Stoyanov, Sam Oussedik
PURPOSE: This study aimed to determine the effect of a simulation course on gaze fixation strategies of participants performing arthroscopy. METHODS: Participants (n = 16) were recruited from two one-day simulation-based knee arthroscopy courses, and were asked to undergo a task before and after the course, which involved identifying a series of arthroscopic landmarks. The gaze fixation of the participants was recorded with a wearable eye-tracking system. The time taken to complete the task and proportion of time participants spent with their gaze fixated on the arthroscopic stack, the knee model, and away from the stack or knee model were recorded...
June 19, 2018: Knee
Carlos Martín-Hernández, Luis Javier Floría-Arnal, Andrés Gómez-Blasco, Alberto Hernández-Fernández, Cristian Pinilla-Gracia, Luis Rodríguez-Nogué, Miguel Lizcano-Palomares, Elena Masa Lasheras
BACKGROUND: Implantation of a prosthesis after post-traumatic knee arthritis poses challenges derived from the bone defects and soft tissue damage. The objective of this study was to evaluate the clinical and radiological results of the use of metaphyseal sleeves in primary total knee arthroplasty surgery after post-traumatic arthritis. METHODS: Clinical and radiological results of 25 patients undergoing surgery for post-traumatic knee arthritis were prospectively evaluated...
June 17, 2018: Knee
Joseph Pagkalos, Robert Molloy, Martyn Snow
Malunited tibial plateau fractures are a surgical challenge. We report a case of a malunion following a Schatzker V tibial plateau fracture with a biplanar deformity of the medial hemi-plateau. This was treated with an intra-articular osteotomy and biplanar restoration of the medial hemi-plateau using patient-specific guides and 3-dimensional planning based on computed tomography (CT) images. The mechanical axis was paradoxically preserved and the lateral compartment showed evidence of overload and degeneration secondary to a malunited tibial spine bone block providing varus/valgus constraint...
June 8, 2018: Knee
Martin Eichinger, Werner Schmoelz, René Attal, Armin Moroder, Christian Heinz Heinrichs, Vinzenz Smekal, Raul Mayr
BACKGROUND: Ideal diameter for tibial interference screw fixation of the anterior cruciate ligament (ACL) graft remains controversial. Tibial graft fixation with screws matching the tunnel diameter vs. one-millimetre oversized screws were compared. METHODS: In 32 cadaveric porcine tibiae, bovine extensor tendons with a diameter of eight millimetres were fixed in (I) a primary ACL reconstruction scenario with eight-millimetre tibial tunnels (pACL), with eight-millimetre (pACL-8) vs...
June 7, 2018: Knee
Alberto Grassi, Cecilia Signorelli, Francisco Urrizola, Federico Raggi, Luca Macchiarola, Tommaso Bonanzinga, Stefano Zaffagnini
BACKGROUND: Until now, there has been a lack of in vivo analysis of the correlation between bony morphological features and laxity values after an anterior cruciate ligament (ACL) injury. METHODS: Forty-two patients who underwent ACL-reconstruction were enrolled. Static laxity was evaluated as: antero-posterior displacement and internal-external rotation at 30° and 90° of flexion (AP30, AP90, IE30, IE90) and varus-valgus rotation at 0° and 30° of flexion (VV0, VV30)...
May 23, 2018: Knee
Catherine R Galvin, Diana M Perriman, Phillip M Newman, Joseph T Lynch, Paul N Smith, Jennie M Scarvell
BACKGROUND: Understanding healthy deep flexion kinematics will inform the design of conservative clinical rehabilitation strategies for knee osteoarthritis and contribute to improved knee prosthesis design. This study is a systematic review and meta-analysis of the kinematic outcomes measured at the healthy tibiofemoral joint during loaded deep knee flexion. METHODS: A computerised literature search and bibliography review without date restriction identified twelve studies with 164 participants aged 25-61 years in-vivo, and 69-93 years in-vitro...
May 22, 2018: Knee
Archana Ananthaharan, Per-Henrik Randsborg
BACKGROUND: This study describes the epidemiology and patient reported outcomes following juvenile osteochondritis dissecans (JOCD) of the knee. METHODS: Medical records and radiographs of patients aged 10-18years diagnosed with JOCD between 2010 and 2016 were retrospectively reviewed. The lesions were classified according to the International Cartilage Repair Society's classification. The results were evaluated with the Knee injury and Osteoarthritis Outcome Score (KOOS), the Lysholm score and a Visual Analogue Scale (VAS) for pain...
May 21, 2018: Knee
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