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Pseudoachondroplasia is a type of short-limb dwarfism. It is a genetic autosomal dominant disorder. It is generally not discovered until 2-3 years of age, since growth is normal at first. Pseudoachondroplasia is usually first detected by a delay in walking or a curious, waddling gait. As the growth rate slows, lumbar lordosis and rhizomelic shortening of the limbs becomes apparent. Most pseudoachondroplasiacs are 80-130 centimeters (31-51 inches) long. Knee deformities (bow-leggedness, knock-knees) are also common. Joint hypermobility at the wrist and fingers can be seen, although mobility at the elbow is slightly impaired. Osteoarthritis is a common complaint of pseudoachondroplasiacs. The gene for pseudoachondroplasia was located, and is called cartilage oligomeric protein.
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