Little is known about fusion times of the primary and secondary centers of ossification in the sacrum, particularly from dry bone observations. In this study, the timing of union of these centers was studied in a sample of modern Portuguese skeletons (90 females and 101 males) between the ages of 0 and 30 years, taken from the Lisbon documented skeletal collection. A three-stage scheme was used...

The primary focus of this article is to review intramembranous bone development, that is, ossification that takes place directly. Comparisons with endochondral ossification (ossification with a cartilage precursor) will be made in order to illustrate the differences between these two modes of ossification and to highlight the comparatively sparse information that is available about intramembran...

Heterotopic ossification is the calcification of the soft tissues with increased calcium accumulation in that tissue. The imaging characteristics are well defined because it is a well-known documented entity. However the metabolic characteristics are less well known due to the relatively recent development of the PET/CT modality. Previous reports in tissues elsewhere the body confirms that the ...

Although absolute variability in postnatal ossification timing is generaIly larger in boys than in girls, reIative, conception-corrected variability is signscantly larger in girls, suggestive of a “dosage” effect and consistent with the hypothesis of partial X-linkage. These findings, together with the excess of sister-sister over brother-brother timing similarities are inconsistent with the hy...

Introduction The term heterotopic ossification refers to the aberrant formation of mature, lamellar bone in nonosseous tissue. Translated from its Greek (heteros and topos) and Latin (ossificatio) etymologic origins, heterotopic ossification can be literally defined as "bone formation in other location." The first written account of heterotopic ossification describes the treatment of symptomati...

BackgroundOssification of the posterior atlantoaxial membrane (PAAM) is a rare cause spinal cord compression.Case presentationA 46-year-old woman with rheumatoid arthritis (RA) and 2-year history slowly progressive gait disturbance underwent surgery for right knee stiffness lower limb mild weakness. A neurologic examination revealed brisk deep tendon reflexes (DTR) spasticity in her four limbs....

Myositis Ossificans [MO], a florid ossification, may occur in muscles and soft tissue. It is also called by many different names. The lesion contains actively proliferating fibroblasts osteoblasts early its development be confused with malignant tumor. commonly affects vigorous young men more so among athletes. Most often involved are the flexor of arm quadriceps femoris. By time presentation, ...

Heterotopic ossification is the formation of new bone in an abnormal location. It is usually seen following central nervous system disorders, including spinal cord injury, traumatic brain injury, encephalitis, and burn and trauma. Heterotopic ossification in post-stroke hemiplegia is rare; the reported incidence is 0.5-1.2%. It usually occurs on the paretic side of hemiplegic patients. We prese...