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Lateral deviation of the radius is primarily observed when there is premature closure of the distal ulnar physis. This condition disrupts the normal growth pattern of the radius and leads to an imbalance in the growth of the forelimb, causing the radius to deviate laterally. In healthy limb development, the radius and ulna grow in tandem, maintaining proper alignment. When the ulnar physis closes prematurely, the radius continues to grow, resulting in a misalignment where the radius appears to bow outward—this is termed lateral deviation.

Understanding this condition is essential since it often requires intervention to correct the deformity and restore proper limb function. As the other conditions listed do not directly cause a lateral deviation of the radius, they do not fit the symptoms associated with this particular form of deviation.