Ischium jumping hurdles, basketball, and martial arts. These fractures occur at tubercles (bony projections that lack secondary ossification centers). Avulsion fractures occur where muscles are attached: anterior superior and inferior iliac spines, ischial tuberosities, and ischiopubic rami. A small part of bone with a piece of a tendon or ligament attached is avulsed (torn away). Ischial bursitis (also known as "weaver's bottom") is inflammation of the synovial bursa located between the gluteus maximus muscle and the ischial tuberosity, and is usually caused by prolonged sitting on a hard surface. Adoption of "ischium" into English-language medical literature dates back to c. 1640;
Silent to the Bone Silent to the Bone Silent to the Bone (2000) is a novel by E. L. Konigsburg for the "middle ages" or for young adults. It is a companion to "The Outcasts of 19 Schuyler Place", a fifteen-years prequel published four years later. Acting as a best friend, therapist and detective, young Connor Kane and his adult half-sister "uncover a complex, multilayered tale of human desires, adolescent confusion, and a touch of menace". Part detective story, some reviews portray it as mystery fiction primarily. It has been recommended for ages 10 to 14. The story is "loosely based on a real