ABSTRACT
The first mould arthroplasty was made from glass in 1923 and was inserted in an ankylosed hip by Smith-Petersen at the Massachusetts General Hospital. Over the next decades, various other materials were used such as Vitallium (cobalt-chromium alloy), introduced in 1938 and polymethylmethacrylate (PMMA) by the Judet brothers in 1950. These prostheses are no longer in use. We report the case of a patient with a Judet acrylic prosthesis which has remained in place since 1951.
Subject(s)
Arthroplasty, Replacement, Hip , Hip Prosthesis , Polymethacrylic Acids , Prosthesis Design , Aged , Humans , Male , Time FactorsABSTRACT
The energy equivalent of plasma lactate production (ELAp) represents the amount of energy that can be derived from the anaerobic glycolysis per kg body weight when the peak plasma lactate concentration (LAp) after exercise increases by 1 mM. ELAp has been calculated from the relationship between the oxygen deficit (Do2) and LAp in 32 subjects. LAp and oxygen uptake measurements were made during constant speed supramaximal running until exhaustion or during the course of constant-speed supramaximal runs of different duration interrupted by 8- to 10- min resting periods. The relationship between Do2 and LAp is described by a linear equation where the slope is equal to ELAp. This equation is: Do2 = 12.3 + 2.4 LAp (r = 0.958; P less than 0.001), where Do2 is expressed in ml O2/kg and LAp in mmol/litre (mM). These findings validate LAp measurements as an index of the anaerobic metabolism during supramaximal running.
