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The name Crurotarsi is derived from the Latin word crus (lower leg) and the Greek word tarsos (ankle). It refers to the specialized articulation (a crurotarsal joint) between the lower leg (specifically the fibula) and the ankle (specifically the calcaneum) which is present in the skeletons of reptiles such as suchians and phytosaurs.
This removes the legs, the genitalia (internal and external), urinary system, pelvic bones, anus, and rectum. [ 1 ] [ 2 ] It is a major procedure recommended only as a last resort for people with severe and potentially fatal illnesses such as osteomyelitis , tumors , severe traumas and intractable decubiti in, or around, the pelvis . [ 3 ]
The name Pseudosuchia was originally given to a group of superficially crocodile-like prehistoric reptiles from the Triassic period, but fell out of use in the late 20th century, especially after the name Crurotarsi was established in 1990 to label the clade (evolutionary grouping) of archosaurs encompassing most reptiles previously identified as pseudosuchians.
Some complications are common for all types of leg associated surgery, while some are specific to popliteal bypass surgery. Complications include but not limited to the following: In the study of 6,007 people carried out popliteal bypass surgery, the overall rate of morbidity and mortality was 36.8% and 2.3% respectively within 30 days post ...
The thin tibia and fibula (lower leg bones) of aphanosaurs do not possess unique traits to the same extent as the femur. However, they are also shorter than the femur. These proportions are rare among early avemetatarsalians, but more common among pseudosuchians and non-archosaur archosauriformes.
The hypothesized leg musculature of P. gracilis, with leg bones (top), superficial muscles (middle), and deep muscles (bottom). When M. G. Mehl first named Poposaurus in 1915, he described it as "a well-muscled creature light in weight, possibly bipedal in gait occasionally, and most assuredly swift in movement."
Poposauroidea was a diverse group of pseudosuchians, containing genera with many different ecological adaptations. Some (Poposaurus and shuvosaurids) were short-armed bipeds, while others (ctenosauriscids and Lotosaurus) were robust quadrupeds with elongated neural spines, creating a 'sail' like that of certain "pelycosaurs" (like Dimetrodon) and spinosaurids.
Ornithosuchidae is an extinct family of pseudosuchian archosaurs (distant relatives of modern crocodilians) from the Triassic period. Ornithosuchids were quadrupedal and facultatively bipedal (e.g. like chimpanzees), meaning that they had the ability to walk on two legs for short periods of time.