only patients who had a single knee operated on have been followed up. The minimum period of observation was 22 years.Among the approximately 8500 patients who had a total meniscectomy between January 1953 and June 1973, 313 aged 18 years of age or less had the procedure in one knee (0.04%). Abdon et al 1 followed up 100 of these patients during 1982 and 1983; they were considered to be a representative group since the only difference between them and those failing to attend for review was the length of time since surgery. There were 89 patients who had a single meniscectomy and 11 who had both menisci removed from the same knee. 6 The complete data and radiographs of both knees from that review were available to us. It was not possible to trace five of the 100 patients, leaving 95 for our study. Ten women and 22 men could not attend for assessment (Fig. 1); all except the five patients who could not be traced, were investigated by analysis of the hospital notes and those of the general practitioner. Half of the 32 patients not available for clinical review were contacted by telephone to confirm the accuracy of these data. We examined 63 patients (48 men and 15 women) and documented their symptoms and levels of activity.