Sternal Rib End
Definition
The anterior (medial) end of the rib that articulates with the sternum via costal cartilage; its progressive pit formation, wall porosity, and structural breakdown are the basis of the Iscan-Loth nine-phase age estimation method.
- Location
- Anterior end of the rib, at the costal cartilage junction
- Method
- Iscan-Loth nine-phase age estimation
- Features scored
- Pit formation, wall porosity, structural breakdown
Common questions
Why is the sternal rib end used for age estimation instead of a long bone?+
The rib end undergoes a progressive, age-correlated sequence of pitting and porosity changes at its cartilage junction that continues into old age, giving useful signal in older adults after long bone growth plates have long since fused and lost their age-diagnostic value.
Does the Iscan-Loth method work equally well on isolated, damaged rib fragments?+
No, the nine-phase scoring depends on assessing the full morphology of the articular end surface, so a fragmented or eroded sternal end reduces confidence in the phase assignment and widens the resulting age estimate.
Related terms
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- Cranial Suture Closure
- The progressive replacement of fibrous suture tissue by bone along the joints between skull bones; the Meindl-Lovejoy 1985 system scores ten ectocranial...
- Dental Cementum Annulations
- Annual bands in the dental cementum (analogous to tree rings) that can be counted microscopically from a thin tooth section to estimate...
- Ectocranial Scoring
- Assessment of cranial suture closure from the outer surface of the skull; slightly later than endocranial closure and more easily assessable on...
- Iscan-Loth Method
- A nine-phase scoring system for the sternal end of the right fourth rib (1984-1985), providing separate male and female reference data for...
- Meindl-Lovejoy Vault System
- A five-site composite scoring system for ectocranial suture closure at midlambdoid, lambda, obelion, anterior sagittal, and bregma sites, derived from the Hamann-Todd...
- Over-50 Ceiling
- The documented failure of most standard skeletal phase methods to distinguish ages above approximately 50 to 55 years with useful precision; a...
- Skeletal Histomorphometry
- Microscopic counting of secondary osteons and fragmentary osteons per unit area of cortical bone cross-section as a supplementary age indicator; requires destructive...
- Wormian Bones
- Accessory ossicles (Inca bones) within cranial sutures, particularly the lambdoid; their presence interrupts suture scoring and must be noted before applying Meindl-Lovejoy...