Over-50 Ceiling
Definition
The documented failure of most standard skeletal phase methods to distinguish ages above approximately 50 to 55 years with useful precision; a consequence of the wide individual variation in degenerative change rates in older adults.
Related terms
- ADBOU Transition Analysis
- A Bayesian software framework (Boldsen, Milner et al. 2002) that combines multiple skeletal age indicators with an adjustable prior age distribution to...
- 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...
- 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...
- Sternal Rib End
- The anterior (medial) end of the rib that articulates with the sternum via costal cartilage; its progressive pit formation, wall porosity, and...
- 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...
Explained in
- Older-Adult Age from Sternal Rib Ends and Cranial SuturesThe documented failure of most standard skeletal phase methods to distinguish ages above approximately 50 to 55 years with useful precision; a consequence of t...