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This diploma thesis concerns itself with the experimental study of friction and lubrication in the artificial hip joint depending on the head size. Measurements were made in a hip joint simulator based on the principle of pendulum. For the friction measurements artificial joints, made from three material combinations and two diameters, from two companies were used. The measurements show that the material combination has a more significant effect to friction coefficient than the head size. Using a bigger head size shows a decrease in friction coefficient for all material combinations when compared to a smaller head size. For the measurement of lubrication film the colorimetric interferometry was applied. A metal-on-glass contact pair was used, where the glass cups were made according to the real measurements of the joint cups. Four types of hip replacements with diameters of 28 and 36 mm with two different diametral clearance were measured during a constant motion of 210 seconds. Measurements show, that the lubrication film in the hip joint with a small diametral clearance increases very fast over the 800 nm value. Contact surfaces in the hip joint with a large diametral clearance aren’t separated by the lubrication film, resulting in a damage of the chromium coating in cup. A thick lubrication film results in a higher friction coefficient, when compared with hip joints with a very thin or no lubrication film.

Diploma thesis deals with analysis of coefficient of friction in total hip prosthesis for several materials bearing with presence of bovine serum as substitute of synovial fluid occurred in natural joint. Behavior of coefficient of friction is observed on Mini Traction Machine. Results are plotted at graphs representing dependence of coefficient of friction on time. There are described effects of several kinematic conditions, the influence of used material and the effect of the method of contact lubrication. The experiments analyze how the formation of lubricant film with a layer of adsorbed protein affects coefficient of friction.

This diploma thesis deals with an experimental analysis of lubricant film formation in hip joint replacements. The main objective is to clarify the effect of mean speed, slide-to-roll ratio, and material of femoral head on the development of film thickness, focusing on the role of particular constituents contained in model synovial fluid, such as albumin and -globulin. For this purpose, a model ball-on-disc configuration was applied, while the development of lubricant film was evaluated using the combination of fluorescent microscopy and optical interferometry. To better understand the process, coefficient of friction between implant surfaces was later investigated as well. The effect of material, slide-to-roll ratio, mean speed and model fluid composition was analysed. Results indicate that the main parameter, influencing the character of film formation, is slide-to-roll ratio. Under most conditions, the dominant constituent responsible for the film thickness development was albumin. Coefficient of friction is affected mainly by the material of implant. The thesis contains original scientific results extending the knowledge in the area of hip joint biotribology.

This master’s thesis describes mechanism of lubricating film forming and its thickness in contact of a metal hip joint ball and a glass disc with chromium layer with presence of bovine serum as substitute of synovial fluid occured in a natural joint. Lubricating film thickness is evaluated by a thin film colorimetric interferometry, results are ploted at graphs representing dependence of lubricating film thickness on experiment duration or on mutual speed of articulating surfaces. There is described the influence of concentration of bovine serum and different kinematic conditions on lubricating film forming. From observed interferograms is apparent the adsorption of proteins to glass disc and femoral head surfaces, denaturation and formation of protein aggregations affecting the residual lubricating film thickness.

The master's thesis is concerned with design and execution of an experimental acetabulofemoral joint simulator. Its primary use is the study of lubrication film thickness in hip implants. The work first describes available hip joint simulators, which simulate particular joint positions. Next, the thesis proposes author’s own designs and solutions. The result is a produced device allowing for dynamic change of load in simulation of hip joint flexion and extension as set by ISO standard. Contact is recorded by an optical apparatus composed of a high-speed camera and a microscope. The work also includes the initial testing experiment and the complete design documentation of the device including electrical wiring diagrams.

隨著全球人口結構高齡化和醫療技術的日新月異，使得全球醫療器材市場，正以前所未有的速度，快速地蓬勃發展，預估2006年全球醫療器材市場的總值約為1,643.57億美元，相對於2006年我國醫療器材產業的營業額新台幣690億元，我國目前大概只佔全球醫療器材市場總值的1.4%，相較於半導體、以及電子業稱霸國際，全球醫療器材市場，不啻是我國廠商的一片藍海! 2004年全球骨科市場的價值達190億美元，預期未來十年的年平均成長率將高達10~13%，聯合骨科在人工關節的設計與製造，具有亞洲第一的水準，非常具有競爭優勢，然而，由於歐美知名品牌的公司規模及在中國人工關節市場先驅者的地位，聯合骨科如何在激烈的競爭環境中脫穎而出，考驗著聯合骨科經理人的智慧；目前，聯合骨科在台灣及大陸，分別擁有約20% 以及10% 的市場佔有率，並在西安與新竹建立生產基地。 透過實際參與中國人工關節市場操作的台灣及大陸的聯合骨科經理人、競爭廠商經理人、以及學術界的專家的角度，利用策略行銷4C成本理論，分析聯合骨科在中國人工關節市場的發展現況的優缺點與可能的成因之後，本研究建議聯合骨科在運用有限資源的有效性及時效性的考量之下，可以考慮優先解決買者的外顯單位效益成本以及買者的專屬陷入成本，進而取得市場上的優勢，除此之外，如果他們能夠持續地提升技術層面的優勢之外，更進一步的創造行銷與服務方面的效能，必能在中國的人工關節市場上，取得優勢，創造出更亮麗的成績；深耕中國、佈局世界，以期與世界級的品牌大廠，能夠在全球的人工關節市場競爭上，有更卓越的表現！ / Along with global aging population and rapid advancement of medical technology, global medical devices market is increasing at the fastest speed ever and is reaching US$ 164B in 2006. 2006 Taiwan medical devices market is US$ 2.3B which is only 1.4% of overall global medical devices market. Comparing with dominant positions of Taiwan semiconducting and electronic industries, global medical devices market is a great “Blue Ocean” opportunity! Global orthopedic market will reach US$ 19B in 2004 and is expected to grow at 10-13% annually for the coming 10 years. United Orthopedic Corporation （UOC） is very competitive and is in a leading position in orthopedic joint design and manufacturing in Asia. Due to relative large company size and market pioneer position of well-known US & European brands in China, management team of UOC is facing a tremendous challenge to win this game；So far, UOC is holding 20% and 10% of market share in Taiwan and China, respectively. UOC has set-up manufacturing bases in both Xian and Hsin-Chu. After consolidating individual assessment of UOC management team, competitors’ management team as well as experts from academic society who are personally involving in orthopedic joint market in China and applying the strategic marketing analysis of 4C theory, we have concluded the strength/weakness and their possible causes of UOC current market status in China. Based on our findings, we suggest UOC could consider utilize its limited resources effectively and efficiently, as priorities, to build up its competitiveness on Cost/Utility ratio and Asset Specificity. If UOC can create effectiveness on both marketing and service furthermore, it can achieve competitive advantage and better performance in China orthopedic joint market；Establishing a strong foundation in China and structuring its market position in the world. UOC will be able to tackle face-to-face competition with world-class orthopedic companies in global market!