Prosthetics and Orthotics International, 1BX 17, 95-I&‘ The CAT-CAM socket and quaddateralsociief: a comparison of energy cost during ambulation

Twenty unilateral trans-femoral amputees fitted with either the Contoured Adducted Trochanteric-Controlled Alignment Method (CAT-CAM) socket (n=lO) or the quadrilateral (QUAD) socket (n=10), and a “non-amputee ” control group (n = 10) participated in the study. Subjects meeting the following criteria were studied: healthy males between the ages of 18 and 55 years, amputation due to non-vascular pathology, an unaffected sound limb, at least six months use of the test prosthesis, and a minimal stump length of 15 cm. Subjects ambulated in two randomized trials separated by 20 minutes of rest at 2 assigned speeds: a pace reflecting normal walking speed (97 m/min=2.5 mph) or a slower speed (48.5 m/min=1.25 mph). Heart rate (HR) and Oxygen uptake (VO2) measured during steady state walking were analyzed via two-way ANOVA. Differences among means were further analyzed using Tukey post hoc and simple effects tests. Significant differences were observed between the control group and CAT-CAM subjects with respect to VOz (pc0.05) and HR (p<O.Ol) at the slower speed. The control group and subjects using the QUAD socket also differed with respect to VOz (p<O.Ol) and HR (p<O.Ol) at the slower pace. Faster pace required more energy expenditure (p<O.Ol) and produced higher HR (p<O.Ol) than slower speeds. At faster pace, a significantly higher energy expenditure in the QUAD than the CAT-CAM group was All correspondence to be addressed t