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A knee cage brace (see figure) is helpful in a variety of knee disorders such as sprains, strains, arthritis, and synovitis. The construction of the brace requires that measurements be taken above, below, and over the patella. A long, elastic knee support is woven according to these measurements so that the fit is snug but not constrictive. Lining the popliteal area of the support with chamois reduces irritation. The support should include pocket slips on each side, which receive rivet-jointed metal bars, and loops for positioning the straps below the knee. The brace is held from slipping without pressing on the patella by these straps and the crossed straps above the knee, one of which is threaded through a slit in the other. The upper straps pass across the front of the leg and are secured at the sides with adjustable fasteners to the upper segments of the metal bars.
Lewin P. SIMPLE KNEE CAGE BRACE. JAMA. 1954;156(4):314. doi:10.1001/jama.1954.02950040020005b