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Device for Strengthening Ankle and Knee Joints

John H. Arnett, MD
JAMA. 1970;213(7):1194. doi:10.1001/jama.1970.03170330074020.
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To the Editor:—  No joint in the body is as frequently "strained" or "sprained" as the ankle. Once sprained, the joint is always more vulnerable. None of the weights or traction devices with which I am familiar is as effective an ankle strengthener as the simple brick-and-can assembly pictured here (Figure).To make the assembly, an ordinary 46-oz can is opened at both ends with a modern can opener. This produces a cylinder with beautifully bevelled ends. The opening of the cylinder may be distorted into an oval by firm pressure and a standard brick forced in for a distance of 1 1/2 to 2 inches. When the pressure is released the resiliency of the metal holds the brick firmly in place. A man's shoe can be slipped into the other end of the can, aided, if necessary, by a little pressure on the side of the can from the


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