A prospective study of the effectiveness of local anaesthesia in arthr
oscopy of the knee was performed in 212 consecutive patients. Arthrosc
opic surgery was undertaken successfully in 121 cases (57%), including
meniscectomy and drilling of osteochondral defects. Dynamic evaluatio
n of the patellofemoral joint articulation was possible and demonstrat
ion of pathological abnormalities was felt to be beneficial by some pa
tients. The method described is safe, reliable, confers good postopera
tive analgesia and enables physiotherapy to begin immediately. Convers
ion to general anaesthesia was necessary in one case due to pain local
ised to a stiff and osteoarthritic hip. Intra-articular haemorrhage wa
s found to be a problem in one case with synovitis. Only ten patients
complained of moderate pain, none had severe pain. Local anaesthesia i
s contraindicated in cases with ipsilateral osteoarthritis of the hip
or with significant synovitis of the knee. This technique is particula
rly suited to day case surgery.