Mauch S.N.S. hydraulic knee units in above-knee amputees. A long-term follow-up study

From 1963 to 1980, 70 Mauch S.N.S. hydraulic knees were prescribed for 60 service-connected, above-knee amputees. The average length of the follow-up period was 7.5 years and the average age of the patient at the time of follow-up evaluation was 47 years. Four of the 60 patients who were given the Mauch S.N.S. units rejected them, for a success rate of 93%. Three of the four patients who opted for devices other than this unit had been given inappropriate prescriptions. Thus, the overall success rate for appropriately prescribed hydraulic knee units was 98.2%. Chart records were available on all patients in the series and 47 patients were available for direct survey, most of whom had used other prosthetic devices prior to receiving the Mauch unit. Survey results and clinical evidence have shown that the hydraulic knee unit is superior to the single-axis hinged device when appropriately prescribed. The hydraulic knee units are recommended for use in the active above-knee amputee who has a strong, relatively long stump and desires a variable cadence gait and more stability in stance, along with the consequent ability to increase activity level. These units are not recommended for use in the weakened, debilitated patient or in patients not willing to care for and maintain the devices.