A good tableless technique for a less mobile patient is to get them to sit on a relatively high chair (the one pictured in the article would work if it was set to a higher position) with their knees flexed and their feet on the floor. The patient has to be sitting close to the edge of the chair to allow adiquate fexion of the knee joint. Then place an object such as a block, stool or step with the digital cassette on directly against their shins. The patients knees should be flexed back so the patella is directly over the cassette You can then use a straight, vertical tube pointing straight down and centered on the femoropatellar joint.

This has the added advantage of reducing the effective dose as the beam is pointed at the floor, not the patient.

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