BackgroundMinimal available information concerning hip morphology is the motivation for several researchers to study the difference between Asian and Western populations. Current use of a universal hip stem of variable size is not the best option for all femur types. This present study proposed a new design process of the cementless femoral stem using a three dimensional model which provided more information and accurate analysis compared to conventional methods.MethodsThis complete design cycle began with morphological analysis, followed by femoral stem design, fit and fill analysis, and nonlinear finite element analysis (FEA). Various femur parameters for periosteal and endosteal canal diameters are measured from the osteotomy level to 150 mm below to determine the isthmus position.ResultsThe results showed better total fit (53.7%) and fill (76.7%) canal, with more load distributed proximally to prevent stress shielding at calcar region. The stem demonstrated lower displacement and micromotion (less than 40 μm) promoting osseointegration between the stem–bone and providing primary fixation stability.ConclusionThis new design process could be used as a preclinical assessment tool and will shorten the design cycle by identifying the major steps which must be taken while designing the femoral stem.

Stress shielding and micromotion are two major issues which determine the success of newly designed cementless femoral stems. The correlation of experimental validation with finite element analysis (FEA) is commonly used to evaluate the stress distribution and fixation stability of the stem within the femoral canal. This paper focused on the applications of feature extraction and pattern recognition using support vector machine (SVM) to determine the primary stability of the implant. We measured strain with triaxial rosette at the metaphyseal region and micromotion with linear variable direct transducer proximally and distally using composite femora. The root mean squares technique is used to feed the classifier which provides maximum likelihood estimation of amplitude, and radial basis function is used as the kernel parameter which mapped the datasets into separable hyperplanes. The results showed 100% pattern recognition accuracy using SVM for both strain and micromotion. This indicates that DSP could be applied in determining the femoral stem primary stability with high pattern recognition accuracy in biomechanical testing.

Total hip arthroplasty is a flourishing orthopedic surgery, generating billions of dollars of revenue. The cost associated with the fabrication of implants has been increasing year by year, and this phenomenon has burdened the patient with extra charges. Consequently, this study will focus on designing an accurate implant via implementing the reverse engineering of three-dimensional morphological study based on a particular population. By using finite element analysis, this study will assist to predict the outcome and could become a useful tool for preclinical testing of newly designed implants. A prototype is then fabricated using 316L stainless steel by applying investment casting techniques that reduce manufacturing cost without jeopardizing implant quality. The finite element analysis showed that the maximum von Mises stress was 66.88MPa proximally with a safety factor of 2.39 against endosteal fracture, and micromotion was 4.73μm, which promotes osseointegration. This method offers a fabrication process of cementless femoral stems with lower cost, subsequently helping patients, particularly those from nondeveloped countries.

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This study addressed the potential methodological issues effect of attentional condition on subsequent vocabulary development from a different perspective, which addressed several potential methodological issues of previous research that have been based on psycholinguistic notion of second language learner as a limited capacity processor. The issue of whether learners paying attention to the processing of input for meaning can simultaneously pay attention to process form remains methodologically unclear issue in the area of reactivity. A qualitative study was conducted on six intermediate English as a foreign language learners. Participants were assigned to one of the three types of reading comprehension tasks. Concurrent data of think aloud was employed to establish learners' attention. Results showed that attending learners' attention to processing of lexical forms while reading for meaning has an effect to induce the issue of reactivity effect on subsequent vocabulary development.

According to the Longman Grammar of Spoken and Written English 1999 by Biber et al. (p. 266) generic article uses are more than twice as common in academic English than in conversation or fiction. This is an area that English for Academic Purpose (EPA) textbooks and teachers would need to target more than general English teaching. This paper is therefore a contribution towards better understanding of what linguistic facts about generics teachers and textbooks of EAP might need to cover in order to deal with them satisfactorily, particularly for learners with Arabic or Malay as L1. This paper is also significant as it is the first to compare the expression of generic meanings by noun phrases in three typologically quite different languages: the Germanic language English, the Semitic language Arabic and the Austronesian language Malay. The contrast between the three languages is substantial in that they have different settings according to the nominal mapping parameter (NMP), which captures some widespread generalizations about the occurrence of mass and countable nouns and articles in the languages of the world. As a part of a bigger project that investigates the acquisition and interpretation of generic reference by speakers of these languages, this article is descriptive and comparative in nature. The main finding is that the rules for mapping forms to generic meanings are more complex in English than in Malay or Arabic, in that English marks the difference between NP level and S level genericity and between established and non-established categories.