Force closure of the sacroiliac joint: cadaver study of the extent of gluteus maximus attachment on the sacrum and relative orientation of muscle fibers
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Medientyp:
E-Artikel
Titel:
Force closure of the sacroiliac joint: cadaver study of the extent of gluteus maximus attachment on the sacrum and relative orientation of muscle fibers
Beschreibung:
The lumbosacral region has many muscles that may stabilize the region during functional activities via force closure (FC). The sacroiliac joint (SIJ) is a key element of this region. The role of individual muscles in FC of the SIJ is poorly understood. We undertook an anatomical study to examine the contribution of the gluteus maximus (GM) to FC.The posterior superior iliac spine (PSIS), sacrum, coccyx, and muscle fiber attachments of the GM were exposed on 30 embalmed cadavers. Sacral dimensions and specific GM muscle fiber attachment sites and their length were recorded. The angles of GM fibers relative to the SIJ were measured by goniometric technique at three specific points on the sacrum. All measurements were taken relative to a reference line connecting the most prominent point of the PSIS to the coccyx (line A).The mean width of GM attachment onto the sacrum at line A was 11.1 cm. At the midpoint of line A, GM extends past the SIJ attaching to the sacrum with a mean length of 3.13 cm and a mean angle of fiber alignment of 90 degrees. The orientation of GM fibers measured at the PSIS was 85.4 degrees.The GM's considerable length of attachment onto the sacrum and its angles of fiber alignment suggest that it may play a significant role in stabilization and force closure of the SIJ. Inclusion of GM recruitment and strengthening exercises may be beneficial for patients diagnosed with sacroiliac dysfunction.Grant Funding Source: none