too many bones

Upper ankle joint The upper ankle joint often contains an accessory bone. This is the Os trigonum, which is the second most common accessory bone in the foot after the Os tibiale externum of the foot. The Os trigonum lies behind the talus. The Os trigonum occurs in 3-15% of the population. The Os trigonum … Upper ankle joint | Accessory bones

Overview Accessory bones, i.e. additional bones that occur in only a few people, are particularly common on the hand and foot. Most of these bones are bones that have been lost in the course of evolution and are considered obsolete, i.e. they are no longer needed by humans. One speaks of so-called atavisms. The accessory … Accessory bones