The present paper represents Part II of the extensive study focused on the lubrication of hip joint replacements. The main goal is to assess the fundamentals of lubrication considering both hard-on-soft (Part I) and hard-on-hard (Part II) bearing pairs. In addition, the effect of individual constituents contained in the model fluid is clarified. For this purpose, multiple model fluids of various composition were employed. In this part of the study, metal-on-glass contact representing hard bearing pairs was observed in situ using pendulum hip joint simulator in combination with thin film colorimetric interferometry method. The designed test consists of initial static loading/unloading phase for the determination of adsorption of molecules on rubbing surfaces. This period is followed by swinging of the pendulum and latest static part under constant load. Three groups of measurements were carried out while fourteen different lubricants were tested. Initially, the experiments were performed with albumin-based model fluid. In that case a substantial positive effect of hyaluronic acid was identified. In contrast, the fluids with γ-globulin as a base constituent showed improved lubrication conditions when phospholipids were added to the solution. Finally, considering the complex fluid, a combined effect of hyaluronic acid and phospholipids caused a better endurance of the lubricant film. The latest part of the paper aims on the comparison of film formation considering hard and soft pairs, highlighting some clear differences. In general, hard pairs exhibit clear decreasing tendency of the film during swinging motion while opposite behaviour was observed for soft pairs.

本文代表了广泛研究的第二部分，该研究的重点是髋关节置换物的润滑。主要目标是同时考虑硬对软（第I部分）和硬对硬（第II部分）轴承对来评估润滑的基础知识。另外，澄清了模型流体中包含的各个成分的作用。为此，采用了各种组成的多种模型流体。在研究的这一部分中，原位观察到代表硬轴承对的玻璃上金属接触使用摆式髋关节模拟器结合薄膜比色干涉法。设计的测试包括初始静态加载/卸载阶段，用于确定摩擦表面上的分子吸附。在此期间，摆锤和恒定负载下的最新静态零件会摆动。进行了三组测量，同时测试了十四种不同的润滑剂。最初，实验是基于白蛋白的模型液进行的。在那种情况下，确认了透明质酸的实质性积极作用。相反，当将磷脂添加到溶液中时，以γ-球蛋白为基本成分的流体显示出改善的润滑条件。最后，考虑到复杂的流体，透明质酸和磷脂的共同作用使润滑膜具有更好的耐久性。本文的最新部分旨在比较硬对和软对的成膜情况，突出一些明显的差异。通常，硬对在摇摆运动过程中表现出明显的膜下降趋势，而软对则观察到相反的行为。