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Anatomy of the Pelvis
Published in Gowri Dorairajan, Management of Normal and High Risk Labour During Childbirth, 2022
Anterior sacroiliac ligament – flat band connecting the bones above and below the pelvic brim. It is well developed close to the arcuate line and posterior inferior iliac spine. This ligament is stronger in females producing a characteristic pre-auricular groove in the female ilium.
A to Z Entries
Published in Clare E. Milner, Functional Anatomy for Sport and Exercise, 2019
The lumbar spine and pelvis support and transmit the weight of the upper body to the lower extremities. The pelvis has a limited amount of movement between its bones and is supported by strong ligaments. The sacroiliac joint has a very limited amount of movement and is supported by the strong posterior and interosseous sacroiliac ligaments, plus the thinner anterior sacroiliac ligament. The interosseous ligaments are the primary structures involved in the transfer of upper body weight to the pelvis and then to the lower extremities. Movement at the sacroiliac joint is further held in check by the strong sacrotuberous ligaments. These ligaments run from the sacrum to the ischial tuberosity of the pelvis and prevent superior rotation of the inferior end of the sacrum. The lumbosacral joint is supported by the iliolumbar ligaments which run from the transverse processes of the L5 vertebra to the iliac bones of the pelvis. There is also a joint between the sacrum and coccyx, although it does not contribute to weight transfer to the lower extremities. The sacrococcygeal joint is supported by anterior and posterior sacrococcygeal ligaments, which run longitudinally from the sacrum to the coccyx.
Lower Limb
Published in Rui Diogo, Drew M. Noden, Christopher M. Smith, Julia Molnar, Julia C. Boughner, Claudia Barrocas, Joana Bruno, Understanding Human Anatomy and Pathology, 2018
Rui Diogo, Drew M. Noden, Christopher M. Smith, Julia Molnar, Julia C. Boughner, Claudia Barrocas, Joana Bruno
The pelvis is formed by two hip bones (os coxae) connected posteriorly (dorsally) by the sacrum (which is part of the axial skeleton: See Section 6.1). Each hip bone is made up of three fused bones—the ilium, ischium, and pubis—that meet in the acetabulum. The ilium is the most superior bone, and the anterior superior iliac spine (at the anteriormost point of the iliac crest) is the bony protuberance you feel under the skin when you palpate the “hip bone.” The gluteal lines, iliac fossa, and arcuate line of ilium are muscle attachments. In the anterior midline, the pubic crestsof the left and right pubes are connected via the cartilaginous pubic symphysis. The superior pubic ramus meets the ischiopubic ramus inferiorly, surrounding the oval obturator foramen, which is covered by the obturator membrane. Other bony features of the pelvis include: iliopubic eminence, pecten pubis, pubic arch, posterior superior iliac spine, and pubic tubercle. The anterior sacroiliac ligament and posterior sacroiliac ligament reinforce the sacroiliac joint. As their names indicate, the sacrotuberous ligament and the sacrospinous ligament connect the sacrum to the ischial tuberosity and the ischial spine, respectively, and thus enclose the lesser sciatic notch and the greater sciatic notch to form the lesser sciatic foramen and the greater sciatic foramen, respectively. The latter two foramina are critical landmarks for the muscular and neurovascular structures of the pelvic region.
Influence of energy absorbers on Malgaigne fracture mechanism in lumbar-pelvic system under vertical impact load
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2019
K. Arkusz, T. Klekiel, G. Sławiński, R. Będziński
The maximum elongation of pelvic ligaments indicating elongation greater than 1% under vertical impact load were shown in Table 5. The analysis of the mechanism of Malgaigne fracture indicated that the first injury was anterior sacroiliac ligament tears in 4.3–5 ms (elongation: 14.78–17.93%). Next, microtrauma to the sacrospinous and sacrotuberous ligaments (elongation: 1.19–3.93%) was observed. The posterior sacroiliac ligament tears were observed after that stress recorded in left pelvic bone exceed the ultimate stress and indicated its fracture (8–8.5 ms).
Development of a flexible instrumented lumbar spine finite element model and comparison with in-vitro experiments
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2022
Aleksander Leszczynski, Frank Meyer, Yann-Philippe Charles, Caroline Deck, Rémy Willinger
The five major ligaments around the pelvis were also modeled: Anterior Sacroiliac Ligament (ASL), Posterior Sacroiliac Ligament (PSL), Interosseous Ligament (IOL), Sacrospinous Ligament (SS) and Sacrotuberous Ligament (ST). Pelvic ligaments were meshed as spring elements (Figure 3b).