progressive valgus deformity of lower extremities (with dislocated patellae) resistant or recurrent clubfeet; ... What is the genetic cause of the dwarfism characterized by a hitchhikers thumb, cauliflower swelling of the ears, and severe clubfeet? This is similar to the classic “hitchhiker’s thumb” in that the thumb is flexed and hyperextends at the joint below your thumb nail. The focus of this chapter will be on the thumbs. The thumb hyperextends at the middle joint, causing it to flatten out when it is bent. Diastrophic dysplasia. Boutonniere deformity. The bones are characterized by crescent-shaped flattened epiphyses, a short and broad femoral neck, and shortening and metaphyseal widening of … It is also called Z-shaped deformity of the thumb. Micromelic dwarfism with clubfeet, hand deformities (abducted or hitchhiker’s thumb), multiple flexion contractures, and scoliosis are present. Hitchhiker’s thumb (also known as Z-shaped deformity of the thumb). Cauliflower ear, a deformity of the cartilage of the ear Cleft palate, an opening or gap in the roof of the mouth Hitchhiker’s thumb, where the thumb sticks out at a right angle to the hand, looking like the child is trying to hitch a ride Disorder Definition . This is also called a duckbill thumb or Z-thumb because of its shape. thumbs (aplasia, hypoplasia, hitchhiker’s deformity, broad thumb, and triphalangeal thumb) Further, with hand abnormalities, other bones of the upper limb are frequently involved. Swan-neck deformity. Arthrogryposis: no dwarfism, no epi-metaphseal involvement, no ear deformity and hitchhiker thumb ; SED: short-trunk dwarfism with stiff hips and often cleft palate and clubfoot, but no thumb and ear involvement. Hitchhiker's thumb is due to the breakdown of bone and cartilage. The thumb consists of a distal joint which keep the thumb in a straight line Hitchhiker thumb deformity, also known as Z-thumb or duckbill thumb, is used to both describe the appearance of the thumb on physical examination and also the corresponding radiographic appearance. Ulnar drift. The middle joint in the finger straightens out while others bend, causing the finger to crane out like a swan’s neck. Hitchhiker's Thumb . Your thumb’s large knuckle abnormally flexes while the top knuckle hyperextends, resembling a Z-shape. Rheumatoid nodules Sometimes called a buttonhole deformity, the middle finger joint is bent in (toward the palm) and the top finger joint is bent out (away from the palm). Thumb deformity (disease) Abnormality of thumb phalanx. In this deformity, your fingers will lean away from your thumb and … Hitchhiker’s thumb. MedGen UID: 113103 Similar to Boutonniere's, hitchhiker's thumb occurs when the knuckle of the thumb bends inward toward the palm. 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