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Knee

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https://www.readbyqxmd.com/read/28189409/registration-accuracy-enhancement-of-a-surgical-navigation-system-for-anterior-cruciate-ligament-reconstruction-a-phantom-and-cadaveric-study
#1
Youngjun Kim, Byung Hoon Lee, Kinde Mekuria, Hyunchul Cho, Sehyung Park, Joon Ho Wang, Deukhee Lee
BACKGROUND: Recently, surgical navigation systems have been widely used to improve the results of various orthopaedic surgeries. However, surgical navigation has not been successful in anterior cruciate ligament reconstruction, owing to its inaccuracy and inconvenience. This study investigated the registration of preoperative and intraoperative data, which are the key components in improving accuracy of the navigation system. METHODS: An accurate registration method was proposed using new optical tracking markers and landmark retake...
February 9, 2017: Knee
https://www.readbyqxmd.com/read/28189407/total-knee-arthroplasty-after-patellectomy-a-meta-analysis-of-case-control-studies
#2
Saeed Asadollahi, Rami Sorial, Simon Coffey, Manish Gupta, Guy D Eslick
BACKGROUND: Post-patellectomy patients represent a specific subset of patients who can develop painful and disabling knee osteoarthritis that requires Total Knee Arthroplasty (TKA). The aim of this study was to conduct a meta-analysis comparing the outcome of TKA in patients with previous patellectomy to those with an intact patella. METHODS: A systematic search of electronic databases (PubMed, Medline, Embase, and Cochrane Library) was performed. Data on study setting, type of implant, outcome and associated complications were extracted...
February 9, 2017: Knee
https://www.readbyqxmd.com/read/28189408/clinical-results-of-alumina-medial-pivot-total-knee-arthroplasty-at-a-minimum-follow-up-of-10years
#3
Suguru Nakamura, Yukihide Minoda, Shigeru Nakagawa, Yoshinori Kadoya, Susumu Takemura, Akio Kobayashi, Shigekazu Mizokawa, Yoichi Ohta, Sinji Takahashi, Kazumasa Yamamura, Hiroaki Nakamura
BACKGROUND: The medial pivot total knee prosthesis with alumina ceramic femoral components was introduced to reproduce physiological knee kinematics and reduce polyethylene wear. The five-year clinical outcomes of alumina medial pivot total knee arthroplasties (TKA) have previously been reported. The purpose of this study was to provide the longer-term clinical results at a minimum follow-up of 10years. METHODS: The clinical results of 70 alumina medial pivot TKA in 51 consecutive patients, with a minimum follow-up period of 10years, were evaluated...
February 8, 2017: Knee
https://www.readbyqxmd.com/read/28189406/surgical-treatments-of-cartilage-defects-of-the-knee-systematic-review-of-randomised-controlled-trials
#4
REVIEW
Brian M Devitt, Stuart W Bell, Kate E Webster, Julian A Feller, Tim S Whitehead
BACKGROUND: The aim of this systematic review was to identify high quality randomised controlled trials (RCTs) and to provide an update on the most appropriate surgical treatments for knee cartilage defects. METHODS: Two reviewers independently searched three databases for RCTs comparing at least two different treatment techniques for knee cartilage defects. The search strategy used terms mapped to relevant subject headings of MeSH terms. Strict inclusion and exclusion criteria were used to identify studies with patients aged between 18 and 55 years with articular cartilage defects sized between one and 15cm(2)...
February 8, 2017: Knee
https://www.readbyqxmd.com/read/28189405/comparison-of-articular-and-backside-polyethylene-wear-in-mobile-bearing-unicompartmental-knee-replacement
#5
Matthew G Teeter, James L Howard, Richard W McCalden, Douglas D Naudie
BACKGROUND: Unicompartmental knee replacement (UKR) is an alternative to total knee replacement for selected patients with isolated medial or lateral compartment osteoarthritis. One of the most popular UKR implants was introduced as a mobile-bearing design in part to reduce polyethylene wear. However, backside wear of the mobile-bearing implant has not been examined independently from the articular surface. METHODS: Sixteen retrieved polyethylene inserts from a medial mobile-bearing UKR from 16 patients were examined after an average of 4...
February 8, 2017: Knee
https://www.readbyqxmd.com/read/28189404/minimally-invasive-surgery-mis-for-total-knee-replacement-medium-term-results-with-minimum-five-year-follow-up
#6
Olivia Unwin, Mohammed Hassaballa, James Murray, William Harries, Andrew Porteous
BACKGROUND: MIS TKA has been shown to offer a reduced in-patient stay, but no clinical difference at two years. Whilst there may be a benefit from earlier discharge, we need to ensure that there are no detrimental effects in the medium and long-term following MIS-TKA. To report the mid-term result from a prospective randomised controlled trial (RCT) comparing MIS-TKA with standard approach for TKA. METHODS: Using knee score questionnaires, we collected patient reported outcome measures (PROMs) regarding pain and function...
February 8, 2017: Knee
https://www.readbyqxmd.com/read/28188084/biomechanical-evaluation-of-knee-endpoint-during-anterior-tibial-loading-implication-for-physical-exams
#7
Ata A Rahnemai-Azar, Fabio V Arilla, Kevin M Bell, Freddie H Fu, Volker Musahl, Richard E Debski
BACKGROUND: Physical exams that apply anterior tibial loads are typically used to evaluate knees with anterior cruciate ligament (ACL) injuries. The amount of anterior tibial translation that occurs during these exams can be difficult to assess due to a "soft" endpoint. Therefore, the objective of this study is to determine the biomechanical characteristics of the endpoint for the intact and ACL deficient knee using quantitative criteria. METHODS: Eight porcine knees were tested using a robotic testing system...
February 7, 2017: Knee
https://www.readbyqxmd.com/read/28188083/ct-based-morphological-analysis-of-the-posterior-femoral-condyle-in-patients-with-trochlear-dysplasia
#8
Xiaohui Liu, Gang Ji, Xinmin Wang, Huijun Kang, Fei Wang
BACKGROUND: The anterior part of the distal femur in trochlear dysplasia has been well investigated; however, to date, posterior morphological characteristics have not been well studied. This study aimed to evaluate whether the posterior femoral condyle in patients with trochlear dysplasia differs from those without trochlear dysplasia. METHODS: Computed tomography scans of 75 knees with trochlear dysplasia and 55 knees with normal anatomy of the patellofemoral joint were analyzed retrospectively...
February 7, 2017: Knee
https://www.readbyqxmd.com/read/28185777/survivorship-and-patient-satisfaction-of-robotic-assisted-medial-unicompartmental-knee-arthroplasty-at-a-minimum-two-year-follow-up
#9
Andrew D Pearle, Jelle P van der List, Lily Lee, Thomas M Coon, Todd A Borus, Martin W Roche
BACKGROUND: Successful clinical outcomes following unicompartmental knee arthroplasty (UKA) depend on lower limb alignment, soft tissue balance and component positioning, which can be difficult to control using manual instrumentation. Although robotic-assisted surgery more reliably controls these surgical factors, studies assessing outcomes of robotic-assisted UKA are lacking. Therefore, a prospective multicenter study was performed to assess outcomes of robotic-assisted UKA. METHODS: A total of 1007 consecutive patients (1135 knees) underwent robotic-assisted medial UKA surgery from six surgeons at separate institutions between March 2009 and December 2011...
February 6, 2017: Knee
https://www.readbyqxmd.com/read/28185776/tibial-tubercle-osteotomy-a-biomechanical-comparison-of-two-techniques
#10
Christopher J Maugans, Matthew G Scuderi, Frederick W Werner, Stefanos F Haddad, John P Cannizzaro
PURPOSE: The purpose of this study was to determine whether a modified step-cut tibial tubercle osteotomy (Maquet-Fulkerson hybrid) might produce comparable or better results than a standard oblique anteromedialization tibial tubercle osteotomy (Fulkerson type) and thus warrant the surgical need for additional cuts. METHODS: Six pairs of cadaveric knees were evaluated prior to and after tibial tubercle osteotomies. Simulation was done via a shallow knee bend simulator through 20 to 70° of knee flexion for the intact specimens and following the surgical procedures...
February 6, 2017: Knee
https://www.readbyqxmd.com/read/28185775/femoral-component-rotations-in-different-gap-tensions-in-total-knee-arthroplasty-a-prospective-randomized-controlled-trial
#11
Joong Il Kim, Sae Hyung Chun, Hyuk Soo Han, Sahnghoon Lee, Myung Chul Lee
BACKGROUND: In total knee arthroplasty (TKA), femoral component rotation is an important factor in the flexion stability and biomechanics of the patellofemoral joint. However, it remains unclear how much tension is appropriate when performing TKA using the gap technique. METHODS: One hundred fifty TKAs that used the gap technique were randomized into one of the three groups. Gravity group (n=50) included patients who underwent TKA using only the weight of the patient's lower leg...
February 6, 2017: Knee
https://www.readbyqxmd.com/read/28179062/smartphone-assessment-of-knee-flexion-compared-to-radiographic-standards
#12
Matthew J Dietz, Daniel Sprando, Andrew E Hanselman, Michael D Regier, Benjamin M Frye
BACKGROUND: Measuring knee range of motion (ROM) is an important assessment for the outcomes of total knee arthroplasty. Recent technological advances have led to the development and use of accelerometer-based smartphone applications to measure knee ROM. The purpose of this study was to develop, standardize, and validate methods of utilizing smartphone accelerometer technology compared to radiographic standards, visual estimation, and goniometric evaluation. METHODS: Participants used visual estimation, a long-arm goniometer, and a smartphone accelerometer to determine range of motion of a cadaveric lower extremity; these results were compared to radiographs taken at the same angles...
February 5, 2017: Knee
https://www.readbyqxmd.com/read/28179061/plateau-patella-angle-an-option-for-the-evaluation-of-patellar-height-in-patients-with-patellar-instability
#13
Marcelo Batista Bonadio, Camilo Partezani Helito, Julio Augusto do Prado Torres, Riccardo Gomes Gobbi, José Ricardo Pécora, Gilberto Luis Camanho, Marco Kawamura Demange
BACKGROUND: Patellar instability is a debilitating disease. An important factor related to recurrent dislocation is patellar height. A new method of patellar height measurement, the plateau-patella angle (PPA), was proposed in 2011. However, to date, there is no study evaluating the use of this method in patients with patellar instability. The aim of this study was to evaluate the PPA in patients with recurrent patellar dislocation. METHODS: This was a retrospective evaluation of the radiographs of 78 knees with patellar instability...
February 5, 2017: Knee
https://www.readbyqxmd.com/read/28173989/analysis-of-the-factors-that-correlate-with-increased-knee-adduction-moment-during-gait-in-the-early-postoperative-period-following-total-knee-arthroplasty
#14
Takeo Nagura, Yasuo Niki, Kengo Harato, Takeshi Mochizuki, Yoshimori Kiriyama
BACKGROUND: Analysis of dynamic knee loading during gait is essential to prevent mechanical failures following total knee arthroplasty. External knee adduction moment during gait is the primary factor producing medial joint reaction force, and an increase in the moment is directly related to an increase in the medial compartment load on the knee. METHODS: Knee adduction moment during gait in 39 knees of 32 female patients following a posterior stabilized knee replacement with a single surgeon was evaluated at 1...
February 4, 2017: Knee
https://www.readbyqxmd.com/read/28173988/gender-differences-in-the-restoration-of-knee-joint-biomechanics-during-gait-after-anterior-cruciate-ligament-reconstruction
#15
Makoto Asaeda, Masataka Deie, Naoto Fujita, Yoshifumi Kono, Chiaki Terai, Wataru Kuwahara, Hodaka Watanabe, Hiroaki Kimura, Nobuo Adachi, Toru Sunagawa, Mitsuo Ochi
BACKGROUND: The aim of our study was to evaluate the effects of gender on recovery of knee joint biomechanics over the stance phase of gait after reconstruction of the anterior cruciate ligament (ACL). METHODS: Gait parameters and knee joint kinematics and kinetics were compared in 32 patients (16 male and 16 female) who underwent ACL reconstruction for a unilateral ACL deficiency, with comparison to an age-, height-, and weight-matched Control group. Knee flexion, adduction and tibial rotation angles were measured and knee extension and abduction moment was calculated by inverse dynamics methods...
February 4, 2017: Knee
https://www.readbyqxmd.com/read/28169100/three-dimensional-relationships-between-secondary-changes-and-selective-osteotomy-parameters-for-biplane-medial-open-wedge-high-tibial-osteotomy
#16
Byung Hoon Lee, Chul Won Ha, Sang Won Moon, Minho Chang, Hun Yeong Kim, Sin Hyung Park, Joon Ho Wang
BACKGROUND: To assess the axial rotational change of distal tibia and posterior tibial slope (PTS) change after OWHTO in 3-D planes and to identify the causal relationship on the effect of variation in the posterior slope angle and rotational errors. METHODS: A total of 21 patients (23 knees) underwent OWHTO and were evaluated with 3D-CT before and after surgery. Medial proximal tibial angle in the coronal plane, PTS in the sagittal plane, and rotational axis in axial plane were evaluated and compared between pre- and post-operative 3D models constructed by applying reverse-engineering software...
February 4, 2017: Knee
https://www.readbyqxmd.com/read/28169098/knee-joint-moments-during-high-flexion-movements-timing-of-peak-moments-and-the-effect-of-safety-footwear
#17
Helen C Chong, Liana M Tennant, David C Kingston, Stacey M Acker
AIM: (1) Characterize knee joint moments and peak knee flexion moment timing during kneeling transitions, with the intent of identifying high-risk postures. (2) Determine whether safety footwear worn by kneeling workers (construction workers, tile setters, masons, roofers) alters high flexion kneeling mechanics. METHODS: Fifteen males performed high flexion kneeling transitions. Kinetics and kinematics were analyzed for differences in ascent and descent in the lead and trail legs...
February 4, 2017: Knee
https://www.readbyqxmd.com/read/28169099/the-role-of-medial-meniscus-posterior-root-tear-and-proximal-tibial-morphology-in-the-development-of-spontaneous-osteonecrosis-and-osteoarthritis-of-the-knee
#18
Ryota Yamagami, Shuji Taketomi, Hiroshi Inui, Keitaro Tahara, Sakae Tanaka
BACKGROUND: Medial meniscus posterior root tear (MMPRT) has been reported to play a key role in the development of spontaneous osteonecrosis of the knee (SONK) and osteoarthritis (OA) of the knee. However, little is known about the differences in the development of SONK and OA after MMPRT. The purpose of this study was to investigate the factors contributing to the development of these conditions. METHODS: We evaluated the existence of MMPRT and the extent of medial meniscal extrusion in preoperative magnetic resonance images and proximal tibial morphology in radiographs of 45 patients with SONK and 104 patients with OA who underwent knee surgery...
February 3, 2017: Knee
https://www.readbyqxmd.com/read/28153419/kinematic-alterations-of-the-lower-limbs-and-pelvis-during-an-ascending-stairs-task-are-associated-with-the-degree-of-knee-osteoarthritis-severity
#19
Glaucia Helena Gonçalves, Luiz Fernando Approbato Selistre, Marina Petrella, Stela Márcia Mattiello
BACKGROUND: Individuals with knee osteoarthritis (OA) generally demonstrate great difficulty in ascending stairs. The strategies and compensations used by these individuals in stair activities have not been fully established. The purpose of this study was to investigate the joint kinematics of the pelvis, hip, knee and ankle throughout the gait cycle, in the sagittal and frontal planes, in individuals with mild and moderate knee OA, during an ascending stairs task. METHODS: Thirty-one individuals with knee OA and 19 controls were subjected to clinical and radiographic analysis, divided into three groups: control, mild knee OA, and moderate knee OA...
January 30, 2017: Knee
https://www.readbyqxmd.com/read/28143683/a-long-term-clinical-outcome-of-the-medial-pivot-knee-arthroplasty-system
#20
George A Macheras, Spyridon P Galanakos, Panagiotis Lepetsos, Panagiotis P Anastasopoulos, Stamatios A Papadakis
BACKGROUND: The ideal total knee arthroplasty (TKA) should provide maximum range of motion and functional stability for all desired daily activities and, if possible, to replicate normal knee kinematics and function. The ADVANCE® Medial Pivot (AMP) Knee System was designed with a highly congruent medial compartment and a less conforming lateral compartment to more closely mimic the kinematics of the normal knee and to offer more stability through out of range of motion (ROM). The purpose of this study was to evaluate the long-term clinical and radiographic outcomes of this TKA system...
January 29, 2017: Knee
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