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Knee Exam

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1061. Wear Distribution Detection of Knee Joint Prostheses by Means of 3D Optical Scanners Full Text available with Trip Pro

Wear Distribution Detection of Knee Joint Prostheses by Means of 3D Optical Scanners The objective of this study was to examine total knee polyethylene inserts from in vitro simulation to evaluate and display-using a 3D optical scanner-wear patterns and wear rates of inserts exposed to wear by means of simulators. Various sets of tibial inserts have been reconstructed by using optical scanners. With this in mind, the wear behavior of fixed and mobile bearing polyethylene knee configurations (...) was investigated using a knee wear joint simulator. After the completion of the wear test, the polyethylene menisci were analyzed by an innovative 3D optical scanners in order to evaluate the 3D wear distribution on the prosthesis surface. This study implemented a new procedure for evaluating polyethylene bearings of joint prostheses obtained after in vitro wear tests and the proposed new approach allowed quantification of the contact zone on the geometry of total knee prostheses. The results of the present

2017 Materials

1062. Cut-Off Value of Medial Meniscal Extrusion for Knee Pain Full Text available with Trip Pro

, 64% of knees without pain cases at the time of examination whose MME exceeded this cut-off value had past knee pain. Conclusions. The sensitivity and specificity of MME for knee pain were very high with a cut-off value of 4.3 mm. (...) Cut-Off Value of Medial Meniscal Extrusion for Knee Pain Purpose. Medial meniscal extrusion (MME) has attracted attention as an index of knee pain in conjunction with clinical symptoms that could be more useful than the diagnosis of knee osteoarthritis on X-ray. However, the size of MME that would cause knee pain has not been clarified. The aim of the present study was to investigate the cut-off value of MME for knee pain. Methods. A total of 318 knees were evaluated. The presence of current

2017 Advances in orthopedics

1063. T1ρ/T2 mapping and histopathology of degenerative cartilage in advanced knee osteoarthritis Full Text available with Trip Pro

T1ρ/T2 mapping and histopathology of degenerative cartilage in advanced knee osteoarthritis To investigate whether normal thickness cartilage in osteoarthritic knees demonstrate depletion of proteoglycan or collagen content compared to healthy knees.Magnetic resonance (MR) images were acquired from 5 subjects scheduled for total knee arthroplasty (TKA) (mean age 70 years) and 20 young healthy control subjects without knee pain (mean age 28.9 years). MR images of T1ρ mapping, T2 mapping (...) , and fat suppressed proton-density weighted sequences were obtained. Following TKA each condyle was divided into 4 parts (distal medial, posterior medial, distal lateral, posterior lateral) for cartilage analysis. Twenty specimens (bone and cartilage blocks) were examined. For each joint, the degree and extent of cartilage destruction was determined using the Osteoarthritis Research Society International cartilage histopathology assessment system. In magnetic resonance imaging (MRI) analysis, 2 readers

2017 World journal of orthopedics

1064. It’s not what it looks like: challenges in diagnosis of synovial lesions of the knee joint Full Text available with Trip Pro

described here - in some synovial lesions of knee joint, even after MRI and arthroscopic examination, histopathological confirmation may still be prudent. In spite of availability of advanced imaging technologies and high definition arthroscopy equipment, an arthroscopy surgeon still must not forget the value of histopathological examination in establishing the true nature of synovial lesions of the knee joint. (...) It’s not what it looks like: challenges in diagnosis of synovial lesions of the knee joint With the advent of MRI (Magnetic Resonance Imaging), Synovial lesions around knee are being more and more easily detected. Synovial lesions of knee present with boggy swelling, effusion, pain, and restriction of motion. Differential diagnoses of such lesions include pigmented villonodular synovitis, synovial lipoma, synovial chondromatosis, rheumatoid arthritis, synovial hemangioma, amyloid arthropathy

2016 Journal of experimental orthopaedics

1065. Association between TLR-9 gene rs187084 polymorphism and knee osteoarthritis in a Chinese population Full Text available with Trip Pro

Association between TLR-9 gene rs187084 polymorphism and knee osteoarthritis in a Chinese population Osteoarthritis (OA) is a complex disease that is induced by many genetic risk variants and other factors. To examine the role of toll-like receptor 9 (TLR-9) in OA patients, we conducted a case-control study involving 215 knee OA (KOA) patients and 215 controls in a Chinese population. Genotyping with a custom-by-design 48-Plex single nucleotide polymorphism Scan™ Kit showed the TLR-9 gene

2017 Bioscience reports

1066. Varus Thrust and Incident and Progressive Knee Osteoarthritis Full Text available with Trip Pro

examiners per study site at 4 sites. In eligible knees, incident OA was defined as subsequent incident Kellgren/Lawrence grade ≥2, whole- and partial-grade medial joint space narrowing (JSN), and annualized loss of joint space width (JSW); progression was defined as medial JSN and JSW loss. Outcome measures were assessed for up to 7 years of follow-up. Analyses were knee-level, using multivariable logistic and linear regression with generalized estimating equations to account for between-limb (...) Varus Thrust and Incident and Progressive Knee Osteoarthritis To determine if varus thrust, a bowing out of the knee during gait (i.e., the first appearance or worsening of varus alignment during stance), is associated with incident and progressive knee osteoarthritis (OA), we undertook an Osteoarthritis Initiative ancillary study. We further considered hypothesized associations adjusted for static alignment, anticipating some attenuation.Gait was observed for the presence of thrust by 1 of 2-3

2017 Arthritis & rheumatology (Hoboken, N.J.)

1067. Total knee replacement—cementless tibial fixation with screws: 10-year results Full Text available with Trip Pro

examined preoperatively and at the final follow-up. Radiological assessment was performed with Knee Society evaluating and scoring system. Kaplan-Meier survival analysis was performed to rule out the survival of the tibial component.The mean HSS scores were 45.8 (range 38-60) and 88.1 (range 61-93), preoperatively and at the final follow-up respectively. Complete radiological assessment was performed for 48 knees. Lucent lines at the tibial component were observed in 4 patients; one of these patients (...) Total knee replacement—cementless tibial fixation with screws: 10-year results The aim of this study was to evaluate the long term clinical and radiological results of cementless total knee replacement.A total of 51 knees of 49 patients (33 female and 16 male; mean age: 61.6 years (range, 29-66 years)) who underwent TKR surgery with a posterior stabilized hydroxyapatite coated knee implant were included in this study. All of the tibial components were fixed with screws. The HSS scores were

2017 Acta orthopaedica et traumatologica turcica

1068. A Case of Infrapatellar Fat Pad Ganglion of the Knee Full Text available with Trip Pro

of parameniscal cysts around the knee. We recommended an open resection with arthroscopic examination. (...) A Case of Infrapatellar Fat Pad Ganglion of the Knee A ganglion cyst can induce symptoms around the knee and should be considered as an intra-articular mass in differential diagnosis.A 22-year-old female presented with a persistent medial knee joint pain in her left knee for 2 years. There was soft tissue swelling on the anteromedial aspect of the infrapatellar region on her left knee. Lachman and McMurray tests were negative. MRI showed a multilobular cyst in the infrapatellar fat pad with T1

2017 The open orthopaedics journal

1069. Maximum lifetime body mass index is the appropriate predictor of knee and hip osteoarthritis Full Text available with Trip Pro

Maximum lifetime body mass index is the appropriate predictor of knee and hip osteoarthritis In light of inconsistencies in the literature, this study aimed to investigate the relationship between obesity (current and historic) and osteoarthritis (OA) of the knee or hip.We examined 99 people (knee OA, hip OA and controls), age > 50 years, in a case-control study. The current weight, height and waist circumference were measured on site, and detailed weight changes over their lifetime were based (...) on questionnaires and standardized interviews. We used binomial logistic regression to determine the predictive value for an osteoarthritis group membership of each derived indicator.An increase in 'maximum-BMI' increased the odds ratio for both knee OA (OR 1.2; CI 1.1-1.4; p = 0.005; R 2 = 0.36) and hip OA (OR 1.2; CI 1.0-1.3; p = 0.027; R 2 = 0.16). Current BMI was significantly associated with knee OA but not with hip OA. A high "minimum-BMI" (over the age of 18 years) had the highest odds ratio of all

2017 Archives of orthopaedic and trauma surgery

1070. Dose-response relationship between lower serum magnesium level and higher prevalence of knee chondrocalcinosis Full Text available with Trip Pro

from each subject. Radiographic knee chondrocalcinosis was present if there was definite linear cartilage calcification. Serum magnesium concentration was measured using the chemiluminescence method. We examined the relation of serum magnesium levels to prevalence of knee chondrocalcinosis using generalized estimating equations.The prevalence of knee chondrocalcinosis was 1.4% in the Xiangya Hospital Health Management Center Study (n = 12,631). Compared with the lowest tertile, the age, sex (...) Dose-response relationship between lower serum magnesium level and higher prevalence of knee chondrocalcinosis The aim was to assess serum magnesium levels in relation to prevalence of knee chondrocalcinosis in two population-based Chinese studies.Data included in this analysis consisted of two population-based cross-sectional studies, i.e., the Xiangya Hospital Health Management Center Study and the Xiangya Osteoarthritis (XO) Study I. A bilateral knee anteroposterior radiograph was obtained

2017 Arthritis research & therapy

1071. Revision Total Knee Arthroplasty with Metaphyseal Sleeves without Stem: Short-Term Results Full Text available with Trip Pro

available for the study. Mean follow-up was 37 months. Knee Society score (KSS) (objective knee score), Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score, and range of motion (ROM) were used as outcome scores and compared with baseline values. X-rays were also examined and compared with postoperative exams to evaluate the presence of loosening, radiolucent lines, and bone ingrowth. Satisfaction of the patients was also investigated using a linear scale from 1 to 10. Results (...) Revision Total Knee Arthroplasty with Metaphyseal Sleeves without Stem: Short-Term Results Purpose  The aim of this study was to evaluate the efficacy of revision total knee arthroplasty (TKA) with cementless metaphyseal sleeves without stems either in the femoral or tibial side or in both. Methods  In this retrospective study, 51 patients (51 knees) operated in the period 2010 to 2015 met the above-mentioned criteria and were invited to a medical examination including X-rays. Forty-six were

2017 Joints

1072. Knee position sense: does the time interval at the target angle affect position accuracy? Full Text available with Trip Pro

Knee position sense: does the time interval at the target angle affect position accuracy? [Purpose] This study examined whether the interval at the target angle during knee joint position sense (JPS) affected reposition accuracy, and evaluated the consequence of this factor on test-retest reliability. [Subjects and Methods] Twenty healthy subjects participated in this study. Reposition ability was measured after the knee was placed at a target angle (ranging from 40° to 60°) for intervals of 3 (...) seconds. Poor reliability was found with time interval of 9 seconds. [Conclusion] The length of time needed to memorize the target angle during knee JPS test might affect test reliability. Practitioners can use this information when collecting JPS data.

2017 Journal of physical therapy science

1073. The effect of knee flexion angles and ground conditions on the muscle activation of the lower extremity in the squat position Full Text available with Trip Pro

was conducted to examine changes of muscle activation of low-extremity muscles at different knee flexion angles of 70°, 90°, and 100°. Balance Pad (Aero Step, TOGU, Germany) was used as unstable ground. Surface electromyogram (4D-MT & EMD-11, Relive, Korea) was used for measuring muscle activation. Measured muscles were vastus medialis, biceps femoris, tibialis anterior, and gastrocnemius. Muscle activation was determined by the root mean square (RMS). [Results] There was a difference in muscle activation (...) The effect of knee flexion angles and ground conditions on the muscle activation of the lower extremity in the squat position [Purpose] The purpose of this study is to research the most effective knee flexion angle and ground condition in the squat position. [Subjects and Methods] The subjects of this study were 15 female college students who were able to perform squat movements and who had never previously experienced surgery, orthopedic disease, or musculoskeletal impairment. This study

2017 Journal of physical therapy science

1074. Initial experience with synthetic MRI of the knee at 3T: comparison with conventional T1 weighted imaging and T2 mapping Full Text available with Trip Pro

Initial experience with synthetic MRI of the knee at 3T: comparison with conventional T1 weighted imaging and T2 mapping To assess the feasibility and accuracy of synthetic MRI compared to conventional T1 weighted and multi-echo spin-echo (MESE) sequences for obtaining T2 values in the knee joint at 3 Tesla.This retrospective study included 19 patients with normal findings in the knee joint who underwent both synthetic MRI and MESE pulse sequences for T2 quantification. T2 values of the two (...) sequences at the articular cartilage, bone marrow and muscle were measured. Relative signal intensity (SI) of each structure and relative contrast among structures of the knee were measured quantitatively by T1 weighted sequences.The mean T2 values for cartilage and muscle were not significantly different between MESE pulse sequences and synthetic MRI. For the bone marrow, the mean T2 value obtained by MESE sequences (124.3 ± 3.6 ms) was significantly higher than that obtained by synthetic acquisition

2017 The British journal of radiology

1075. Landing Kinematics and Kinetics at the Knee During Different Landing Tasks Full Text available with Trip Pro

Landing Kinematics and Kinetics at the Knee During Different Landing Tasks   Several tasks have been used to examine landing biomechanics for evaluation and rehabilitation, especially as related to anterior cruciate ligament injuries. However, comparing results among studies in which different tasks were used can be difficult, and it is unclear which task may be most appropriate.  To compare lower extremity biomechanics across 5 commonly used landing tasks.  Descriptive laboratory study (...) .  University-operated US Air Force Special Operations Forces human performance research laboratory.  A total of 65 US Air Force Special Tactics Operators (age = 27.7 ± 5.0 years, height = 176.5 ± 5.7 cm, mass = 83.1 ± 9.1 kg).  Kinematic and kinetic analysis of double- and single-legged drop landing, double- and single-legged stop jump, and forward jump to single-legged landing.  Hip-, knee-, and ankle-joint kinematics; knee-joint forces and moments; and ground reaction forces (GRFs) were the dependent

2017 Journal of athletic training

1076. Concordance between clinical and radiographic evaluations of knee osteoarthritis Full Text available with Trip Pro

Concordance between clinical and radiographic evaluations of knee osteoarthritis Significant correlation has been previously demonstrated between radiographic and clinical diagnoses of knee osteoarthritis (OA); however, the specific findings on clinical examination that relate best to a radiographic diagnosis have not been fully elicited.We aimed to explore the relationship between clinical symptoms and physical findings with radiographic diagnoses of tibiofemoral and patellofemoral OA.This (...) study was based on 409 individuals from the Hertfordshire Cohort Study, born between 1931 and 1939. Antero-posterior and lateral radiographs were taken of both knees. The presence of tibiofemoral and patellofemoral OA was defined according to the Kellgren and Lawrence score. Clinical symptoms, assessed using WOMAC, and physical findings were ascertained by examination. Relationships were assessed using multilevel univariate logistic regression.In the 775 knees studied, the prevalence of physical

2017 Aging clinical and experimental research

1077. Acute Septic Arthritis of the Knee Caused by Kingella kingae in a 5-Year-Old Cameroonian Boy Full Text available with Trip Pro

Acute Septic Arthritis of the Knee Caused by Kingella kingae in a 5-Year-Old Cameroonian Boy Kingella kingae is an important cause of invasive infections in young children from Western countries. Although increasing reports indicate that this organism is the leading agent of bone and joint infections in early childhood, data on K. kingae infections from resource-limited settings are scarce, and none has yet been reported in Africa. We herein report the diagnostic and epidemiological (...) investigations of the first case of K. kingae arthritis identified in a child from sub-Saharan Africa. A 5-year-old Cameroonian boy presented with a sudden painful limp which appeared in the course of a mild rhinopharyngitis. He lived in Cameroon where he had been vaccinated with BCG at birth and moved to France for holidays 4 days before consultation. There was no history of trauma and he did not have any underlying medical condition. Upon admission, he had a temperature of 36.7°C, and clinical examination

2017 Frontiers in pediatrics

1078. Medial collateral ligament calcification: a rare knee pain entity with literature review Full Text available with Trip Pro

Medial collateral ligament calcification: a rare knee pain entity with literature review Medial knee pain can originate from both osseous and non-osseous soft tissue structures including medial collateral ligament (MCL), creating a raft for patients' sufferings. Previously published works demonstrated MCL calcification as a rare medial knee pain entity. Alongside physical examination, radio-imaging techniques, namely conventional X-ray, CT/MRI scanning, etc. have been reported to be useful

2017 Acta Radiologica Open

1079. Neuromuscular Training Improves Lower Extremity Biomechanics Associated with Knee Injury during Landing in 11–13 Year Old Female Netball Athletes: A Randomized Control Study Full Text available with Trip Pro

Neuromuscular Training Improves Lower Extremity Biomechanics Associated with Knee Injury during Landing in 11–13 Year Old Female Netball Athletes: A Randomized Control Study The purpose of this study was to examine the effects of a neuromuscular training (NMT) program on lower-extremity biomechanics in youth female netball athletes. The hypothesis was that significant improvements would be found in landing biomechanics of the lower-extremities, commonly associated with anterior cruciate (...) tasks, a drop vertical jump and a double leg broad jump with a single leg landing. The experimental group significantly increased bilateral knee marker distance during the bilateral landing task at maximum knee-flexion range of motion. Knee internal rotation angle during the unilateral landing task at maximum knee flexion-extension range of motion was significantly reduced (p ≤ 0.05, g > 1.00). The experimental group showed large, significant decreases in peak vertical ground reaction force in both

2017 Frontiers in physiology Controlled trial quality: uncertain

1080. Clinical Outcomes of Donor Sites After Osteochondral Graft Harvest From Healthy Knees Full Text available with Trip Pro

Clinical Outcomes of Donor Sites After Osteochondral Graft Harvest From Healthy Knees The use of autologous osteochondral grafts has become popular in the treatment of small, isolated, well-contained articular cartilage defects. However, donor site morbidity is a problem, and few reports are available of donor site morbidity after mosaicplasty.To examine the clinical outcomes of donor sites after osteochondral grafts from healthy knees.Case series; Level of evidence, 4.Between September 1997 (...) and September 2011, there were 40 patients (40 knees; 32 men, 8 women; 31 right knees, 9 left knees) with asymptomatic osteochondral graft donor sites used for autologous transfer; all had a follow-up period of >2 years. The mean patient age at surgery was 21.0 years (range, 12-58 years). The recipient sites included the elbow (n = 28), contralateral knee (n = 5), and ankle (n = 7). The mean diameter of the grafted plugs was 7.5 mm (range, 4.5-9 mm), and the mean number of grafted plugs was 2.2 (range, 1-3

2017 Orthopaedic journal of sports medicine

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