Inventory, Preservation and Completeness
In forensic and archaeological contexts, human bone specialists create an ‘osteological profile’ from skeletal remains and radiographs. This profile consists of a description of the key identifying features of an individual. These typically include:
- Evidence of pathology or trauma
Ancestry is also sometimes included in an osteoprofile. However, techniques for estimating ancestry, and the interpretation of ancestry as a category of human identification and identity are theoretically and politically contentious. For more information on this please see the recent publication by Bethard and DiGangi, 2020. Given the importance and nuances of these debates, there is not enough space here to do them justice at this introductory level.
Tegucigalpa, Honduras. A radiologist studies x-rays of victims of the Comayagua prison fire, looking for injuries, fractures, medical devices and other identifying marks. (Photographer Alejandra Jimenez, Copyright ICRC)
The accuracy of the osteoprofile is dependent on preservation and completeness of the skeleton, as well as the context of burial. For example, commingled remains, in which two or more individuals are placed within the same grave, can complicate analysis, particularly if those individuals are of a similar age and sex (we will discuss this further in Week 6).
To begin an osteoprofile, we need to identify the bones that are present. We also need to determine how many of each bone we have and establish whether there are one or more individual(s) represented in the skeletal assemblage. To do this accurately, we also need to determine the preservation and completeness of the bones that we have.
There are a variety of different techniques for producing an ‘osteoprofile’ and over the past decade, there has been an increasing emphasis on the standardisation of methods to ensure comparability between studies. An example of these standards is provided by the British Association of Biological Anthropology and Osteoarchaeology.
It is important that methods are appropriate for the skeletons being analysed and there are some minor differences in the timing of skeletal development and body proportions between groups of people living in different environments. Population-specific methods have been developed to calculate aspects of the osteoprofile such as stature.
Creating an Inventory
First, the skeletal remains should be laid out in anatomical position in the laboratory. A full inventory of the bones present should be produced. Usually, this consists of a written inventory and a diagrammatic representation. To see examples of skeletal inventory forms please look at those provided by INTERPOL Disaster Victim Identification and for archaeological contexts those recommended by the British Association of Biological Anthropology and Osteoarchaeology.
Assessing Preservation and Completeness
The completeness of the skeleton should be estimated using standardised criteria. Usually, this consists of an estimate of the proportion of the skeleton that is present. A skeleton may be very complete in terms of skeletal element representation, but still poorly preserved, depending on the degree of fragmentation of the bones and the appearance of the cortical (outer) surface. These features are therefore scored separately. If the surface texture of the bones is badly eroded then this can affect the anthropologist’s ability to estimate age-at-death and may also impact on the identification of pathological lesions.
To assess preservation and completeness you should record:
- Completeness of the skeleton (What percentage of the skeleton is present? How complete is each bone?)
- Fragmentation of the bones (Are the bone elements in one piece, broken into several pieces, or broken into many small fragments?)
- Degree of surface erosion (Is the surface of the bone in good condition or has it been damaged?)
In the next steps we will be discussing more detailed aspects of constructing an osteoprofile.
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