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Example of assessing the contribution of an extra-articular deformity to the limb deformity: the angulation at the extra-articular deformity is 10°. The proportional distance from the ankle to the knee is calculated as follows: ²⁸⁄(₂₈+₉) = ²⁸⁄₃₇ = 75.7%; therefore, 75.7% of 10° equals 7.6°. So, the contribution of extra-articular angulation to the overall knee alignment is about 7.6°
