Full Ball & Socket Joint Description. [Continued from above] . . . In the shoulder joint, the spherical head of the humerus (upper arm bone) fits into the glenoid cavity of the scapula (shoulder blade). The glenoid cavity is a small and shallow cavity that permits the shoulder joint the greatest range of motion in the human body.
Lumbar lordosis refers to the inward curvature of the spine just above the buttocks. The National Institutes of Health reports that lordosis is caused by spondylolisthesis. Spondylolisthesis is a condition in which a spinal bone slips out of its normal space and onto the bone below it.
Hyperlordosis Causes and Treatment Options Our spine is normally curved, in order to reduce shock and distribute weight evenly along the length of the back. However, in hyperlordosis (sometimes simply called lordosis and commonly known as âswaybackâ) the natural lordotic curves in the spine become overly pronounced, causing pain and sometimes spasms in the lumbar muscles. Though hyperlordosis most often occurs in the lumbar region of the back, it can also appear in the cervical spine. There are a few different causes of lordosis. It can be congenital, occurring during fetal development when a significant difference develops between the thickness of the front and back parts of the cervical discs.