1. Since Leslie and Bentley in 1978 showed unsatisfactory results using clinical criteria it is now widely agreed that accurate diagnosis of chondromalacia patellae is difficult. Additional methods are needed to establish the diagnosis. Arthroscopy is a valuable method for the diagnosis of chondromalacia patellae.16 37-40 Although it provides an easy method for examining the patellofemoral joint, there are some problems. Chondromalacia patellae is a common disease, but arthroscopy has not been used widely enough. Furthermore, many patients are reluctant to accept arthroscopic investigation. Thus it has been necessary to establish the diagnosis using the following criteria: (a) presence of long term 'typical symptoms; (b) presence ofobjective clinical signs as suggested by Leslie and Bentley'6; and (c) elimination of other diseases
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