Cannula size is often short for pediatric cases to make the instruments seem more age appropriate, yet this may be a drawback in some cases. If the instruments are of normal length, the shorter cannulae offer no advantage at all. For all situations in which the can-nulae are fairly close together, shorter lengths are detrimental as the heads will bump into each other more often. In smaller children with retroperitoneal exposures, the short cannulae are a particular problem, specifically if they have larger heads. If there is a problem with the port being too short to reach the area of surgery, the port should be fixed so as to permit further entry into the working space, but being limited on withdrawal to prevent accidental removal.

When using pediatric instruments, one should avoid using instruments of differing lengths, as this creates further asymmetry of the surgeon's arm position, one arm being close, the other distant from the patient.

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