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Stéphane Northon, Karine Boivin, Louis Laurencelle, Nicola Hagemeister, Jacques A de Guise
BACKGROUND: Knee osteoarthritis alters joint stability but its kinematics during functional weight-bearing tasks remain unclear. We propose and validate an assessment technique for the quantification of knee alignment and stability in patients during a short single leg stance task. METHODS: Three-dimensional knee kinematics were acquired non-invasively from 31 knee osteoarthritis patients (subdivided as moderate or severe) and 15 asymptomatic individuals during six short single-leg stance tasks...
November 8, 2018: Knee
Kang-Il Kim, Gi Beom Kim, Hwan Jin Kim, Sang Jun Song
BACKGROUND: This study aimed to assess the morphological degeneration of the anterior cruciate ligament (ACL) through magnetic resonance imaging (MRI) and arthroscopy. It analyzed whether the pre-operative ACL status would affect the radiologic and clinical outcomes following medial open-wedge high tibial osteotomy (MOWHTO). METHODS: A total of 150 knees were enrolled that underwent MOWHTO concomitant arthroscopic debridement for the treatment of varus osteoarthritis...
November 8, 2018: Knee
Veronica Macchi, Andrea Porzionato, Raffaele De Caro
No abstract text is available yet for this article.
November 8, 2018: Knee
K Hermans, H Vandenneucker, J Truijen, J Oosterbosch, J Bellemans
BACKGROUND: Total knee arthroplasty (TKA) remains the gold standard for end-stage knee osteoarthritis. The prevalence of stiffness after this procedure described in literature varies from 1.3% to 5.3%. The causes of arthrofibrosis after total knee arthroplasty are multifactorial. Revision TKA is a successful procedure when performed for loosening, instability, mechanical implant failure, or infection. The results of revision TKA for idiopathic arthrofibrosis and stiffening are however less favorable...
November 8, 2018: Knee
Annemie Smeets, Bart Malfait, Bart Dingenen, Mark A Robinson, Jos Vanrenterghem, Koen Peers, Stefaan Nijs, Styn Vereecken, Filip Staes, Sabine Verschueren
BACKGROUND: There is limited evidence on neuromuscular risk factors for anterior cruciate ligament (ACL) injuries, with most work mainly focusing on hamstrings and quadriceps muscle strength. This prospective pilot study explored if neuromuscular activation patterns of the quadriceps and hamstrings during a drop vertical jump influence ACL injury risk. METHODS: Forty-six female athletes performed a drop vertical jump at baseline. Injuries were monitored throughout a one-year follow-up...
November 8, 2018: Knee
Binggang Wang, Yanfei Lang, Liu Zhang
BACKGROUND: The purpose of this study was to characterise the histopathological changes in the infrapatellar fat pad (IPFP) in the early stage of patellofemoral osteoarthritis (PFOA). METHODS: Sixty-four New Zealand white rabbits were randomly divided into experimental (n = 24), sham (n = 16), and control groups (n = 24). In the experimental group, denoted as the patellar ligament uneven shortening group (US group), the patellar ligament (PL) was folded eight millimetres and sutured...
November 8, 2018: Knee
Jiliang Zhai, Xisheng Weng, Baozhong Zhang, Huiming Peng, Yanyan Bian
BACKGROUND: There are limited reports about management of Knee flexion contracture (KFC) in haemophiliacs with Ilizarov technique. The aim of this study was to retrospectively analyzed the results of Ilizarov technique to treat KFC. METHODS: Six patients with haemophilia A and one with haemophilia B were included in this study, with an average age of 17 years old. The mean preoperative KFC and flexion angle of the knee were 58 ± 21° (mean ± standard deviation) and 127 ± 12°, respectively...
November 8, 2018: Knee
Madeleine Norris, Gillian Corbo, Kamal Banga, Marjorie Johnson, Martin Sandig, Thomas Smallman, Alan Getgood, Timothy A Burkhart
BACKGROUND: The ligamentum mucosum is composed of dense regular connective tissue and traverses from the distal femur to the infrapatellar fat pad. While the gross and histologic morphology has been studied, there is currently no evidence concerning the biomechanical properties of the ligamentum mucosum and the potential of anterior knee pain. The purpose of this study was to determine the anatomical, mechanical and histological properties of the ligamentum mucosum. METHODS: Dissections were performed on cadaveric knee specimens (N = 18) and histological analysis (n = 6) was performed to define the anatomical characteristics of the ligamentum mucosum using standard hematoxylin and eosin (H&E), Masson's trichrome, and immunohistochemical methods...
November 8, 2018: Knee
Jin Hwa Jeong, Moon Jong Chang, Seung-Baik Kang, Chong Bum Chang, Chan Yoon, Jisu Park, Seung Ah Lee
BACKGROUND: This study aimed to determine the prevalence of excessive lateral pressure syndrome (ELPS) in potential candidates for high tibial osteotomy (HTO) using single-photon emission computed tomography-computed tomography (SPECT-CT). We also sought to identify risk factors related to the presence of ELPS. METHODS: This retrospective study included 150 patients (216 knees) who were candidates for HTO from an initial screening of 3579 patients (7158 knees). There were 183 female and 33 male knees with a mean age of 58 years...
November 8, 2018: Knee
Casey A Slattery, Christopher Y Kweon, Mia S Hagen, Albert O Gee, Richard V Williamson
BACKGROUND: While degenerative changes to the articular cartilage of the anterior and distal portions of the femoral condyles have been well studied in the literature, the changes that occur on the posterior femoral condyle are not as clear. The purpose of this study was to assess the difference in articular cartilage thickness between the medial and lateral posterior femoral condyles in knees undergoing unicompartmental knee arthroplasty. METHODS: A retrospective review of prospectively gathered data on 107 consecutive patients undergoing unicompartmental knee arthroplasty performed by a single surgeon was performed...
November 8, 2018: Knee
Madeline Simon, Chloe Parizek, Jennifer E Earl-Boehm, David M Bazett-Jones
BACKGROUND: The aim was to determine reliability and validity of frontal plane projection angle (FPPA) and visual assessments (VA) in both males and females. METHODS: Fifty-four participants (30 females) performed lateral step-downs while kinematics were recorded by two-dimensional and three-dimensional analyses. Two raters viewed the videos, extracted images, and measured the FPPA (quantitative). Using the videos, the raters also categorized (qualitative VA) each participant's motion as demonstrating dynamic valgus (>10° valgus), dynamic varus (>10° varus), or no change...
November 8, 2018: Knee
Joshua S Everhart, John D Higgins, Sarah G Poland, Moneer M Abouljoud, David C Flanigan
PURPOSE: The purpose of this review is to evaluate published outcomes for reported failure rates following meniscus repair in patients age 40 years or older. METHODS: A systematic search was performed, and 225 meniscus repair outcome studies on adults were identified in the English literature. Included studies reported either individual patient data with at least one patient age ≥40 years or summary data with all patients' age ≥40 years. Failure rates were determined based on previously reported risk factors (regardless of age) including concomitant anterior cruciate ligament (ACL) reconstruction (ACLR), tear location, and tear pattern...
November 7, 2018: Knee
Takashi Kitagawa, Junsuke Nakase, Yasushi Takata, Kengo Shimozaki, Kazuki Asai, Hiroyuki Tsuchiya
No abstract text is available yet for this article.
November 7, 2018: Knee
Hiroshi Inui, Shuji Taketomi, Ryota Yamagami, Kohei Kawaguchi, Keiu Nakazato, Sakae Tanaka
BACKGROUND: Acquisition of appropriate anteroposterior (AP) stability depends on the prosthetic design and intraoperative soft tissue handling. A bi-cruciate stabilized (BCS) total knee arthroplasty (TKA) has a two cam-post mechanism, which substitutes for the anterior cruciate ligament and posterior cruciate ligament (PCL). Therefore, appropriate AP stability is expected. Because the PCL is sacrificed during BCS TKA, medial stability and lateral stability are thought to be important factors to determine AP stability...
November 7, 2018: Knee
Andres Schmidt-Hebbel, Carlos Gomez, Carolina Aviles, Elmar Herbst, Maximiliano Scheu, Gonzalo Ferrer, Gonzalo Espinoza
BACKGROUND: Several reports of severe infections associated with allograft tissue in knee reconstructive surgery have led many surgeons to consider routine intraoperative culture of allograft tissue before implantation. Thus, the purpose of this study was to determine the prevalence of positive soft tissue allograft cultures in reconstructive knee surgery, and evaluate its association with surgical site infection. METHODS: Retrospective study of 202 patients who underwent knee reconstructive ligament surgeries, including revisions, between January 2013 and July 2017...
November 7, 2018: Knee
Steven F DeFroda, Naga Padmini Karamchedu, Brett D Owens, Steven L Bokshan, Kayleigh Sullivan, Paul D Fadale, Michael J Hulstyn, Robert M Shalvoy, Gary J Badger, Braden C Fleming
PURPOSE: To investigate tibial tunnel widening in ACL reconstruction patients over seven years to establish the effects of initial graft tension on tibial widening and clinical outcomes when using both patellar tendon (BTB) and hamstring tendon (HS) grafts. METHODS: Ninety patients, who were reconstructed with BTB or HS autografts, were randomized using one of two initial graft tension protocols; 1) tensioned to restore normal anteroposterior laxity ("low-tension"; n = 46) and 2) tensioned to over-constrain anteroposterior (AP) laxity by two millimeters ("high-tension"; n = 44)...
November 7, 2018: Knee
Monther A Gharaibeh, Elizabeth Monk, Darren B Chen, Samuel J MacDessi
BACKGROUND: Standard radiographic views for patellofemoral joint assessment do not reflect loading at which TKA patients may describe post-operative anterior symptoms. A novel weight bearing (WB) Merchant view has been described and demonstrated a number of tracking changes that correlated with clinical outcomes. In this study, we aim to validate the WB Merchant view and assess relationships with patient outcome scores. METHODS: Patients were randomly allocated to receive one of the three commonly used patellar implants with a single TKA prosthesis...
November 5, 2018: Knee
Ravi Gupta, Anil Kapoor, Naveen Mittal, Ashwani Soni, Sourabh Khatri, Gladson David Masih
BACKGROUND: The role of an intact meniscus in providing mechanical stability to the knee of anterior cruciate ligament (ACL) deficient and ACL reconstructed patients has not been well studied. METHODS: This was a prospective cohort study. A total of 205 patients undergoing ACL reconstruction were enrolled, of which 61 had normal menisci, 49 had a tear in the posterior horn of the medial meniscus (PHMM) (tear <40% of width = 19; >40% of width = 30), 35 had a tear in the lateral meniscus (<40% of width = 15; >40% = 20), 13 had a tear in the body and/or anterior horn of the medial meniscus (<40% of width = 6; >40% = 7) and 47 patients had a tear in both menisci...
November 5, 2018: Knee
Hasan Raza Mohammad, Stefano Campi, David Murray, Stephen Mellon
BACKGROUND: Tibial plateau fracture is an important complication of cementless Oxford unicompartmental knee replacement. The press fit between the keel and the bone's keel slot is responsible for primary fixation and also contributes to fracture risk. This study investigates whether the fracture risk could be reduced without compromising primary fixation, by using different instruments to widen the keel slot. METHODS: Keel slots were made in polyurethane blocks (n = 60) using the standard keel cut saw blade or a new blade that was 0...
October 27, 2018: Knee
Brent A Lanting, Harley A Williams, Nicholas F Matlovich, Pieter-Jan Vandekerckhove, Matthew G Teeter, Edward M Vasarhelyi, James L Howard, Lyndsay E Somerville
BACKGROUND: Following a total knee arthroplasty (TKA), restoration of the mechanical axis of the lower limb to a neutral position of 0° ± 3° is generally considered the standard of care. Little is known, however, regarding the impact of realignment defined according to the patient's physiologic anatomy on clinical outcome scores. METHODS: The study included 67 knees with a mean age of 65.9 ± 8.3 years with unilateral osteoarthritis (OA) who underwent a primary unilateral TKA for medial end-stage OA...
October 9, 2018: Knee
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