john hawks weblog

paleoanthropology, genetics and evolution

paleopathology

  • Paleopathology of care

    Wed, 2012-12-19 12:18 -- John Hawks

    A story in the New York Times today by James Gorman covers some cases of ancient skeletons that provide evidence of long-term palliative care in prehistoric societies: "Ancient Bones That Tell a Story of Compassion". The article focuses on the work of Lorna Tilley, who has been working to build a more systematic understanding of the paleopathology of care.

    Ms. Tilley gained her undergraduate degree in psychology in 1982 and worked in the health care industry studying treatment outcomes before coming to the study of archaeology. She said her experience influenced her interest in ancient health care.

    What she proposes, in papers with Dr. Oxenham and in a dissertation in progress, is a standard four-stage method for studying ancient remains of disabled or ill individuals with an eye to understanding their societies. She sets up several stages of investigation: first, establishing what was wrong with a person; second, describing the impact of the illness or disability given the way of life followed in that culture; and third, concluding what level of care would have needed.

    A paralyzed person, for example, would need “direct support” similar to nursing care while someone like Romito 2 would need “accommodation,” that is to say tolerance of his limitations and some assistance.

    It's a good article, with a broad representation of biological anthropologists including Debra Martin and Jane Buikstra.

  • Paleopathology

    Sun, 2011-10-23 23:32 -- John Hawks
    Synopsis: 
    Laboratory exercise discussing different categories of pathology detectable on skeletal remains.

    Often the skeleton bears signs of disease or injury that occurred during an individual's lifetime. Not every disease affects bone, but some have highly recognizable effects. These help us to uncover the lifestyles of ancient people, and sometimes to solve mysteries about the identity of recent remains. This study is called paleopathology.

    Osteoarthritis This is an inflammation of the joints, accompanied by an erosion of the bone surface of the joint. Often the bone reacts by growing additional bone, or sometimes fusing the joint entirely so that it becomes immobile. Look at the examples of osteoarthritis at this station. What would the effect of the disease have been on the mobility of these individuals?

    Healed fractures When bones break, new bone will grow to heal the fracture as long as the bone fragments are in contact with each other. These healed fractures can often be seen as thickened scars, sometimes externally and even more often in X-ray images. If the bone was not set correctly after the fracture, it may heal in a misaligned position.

    Cranial deformation Some peoples systematically deform the heads of infants and young children. This can be accomplished by binding the head with cords, strapping the head to a cradleboard, or simply applying pressure on the forehead at regular intervals. The signs of deformation can be highly visible on the skull, and may be strongly valued by cultures that engage in the practice.

    Dislocations Related to fractures, sometimes a joint does not set properly after a dislocation. In extreme cases, the joint may form a new articular surface in an abnormal location. Hip dislocations, for example, can cause greatly enlarged or secondary acetabula, or hip sockets.

    Osteoporosis Progressive loss of bone density affects many older people in today's societies. This can be identified on the skeleton. Osteoporotic bones are very light, and their trabecular structures may be very fragile.

    What to do: This station has several bones with signs of pathology. See what you can identify on these remains.

    Study questions: 
    1. Does your skeleton have traces of injuries or conditions that might be detected by a future paleopathologist?
    2. Think about the ways that the health of the skeleton can inform scientists about other conditions within ancient populations. What kinds of problems would be invisible on the skeleton?
  • Mailbag: Thick skulls and diet

    Tue, 2011-04-12 23:15 -- John Hawks

    Re: "Hard headed science":

    Although genetics undoubtedly play a part in the thickness of the skull bone, there is another parameter that more often than not is overlooked by anthropologists. That parameter is nutrition. Modern man is overfed on calories but malnourished on micronutrients. Soft tissues always evolve to their fullest, but the hard tissues, i.e. bone, are much more dependent on nutrition and physical work-load. Compared to the skulls of its ancestors, the skull of modern man is thinner, smaller, narrower, the eye sockets tend to be rounder and there tends to be insufficient space for the teeth in the mouth. It seems reasonable to me that in so far as the shape of the skull, it is the phenotype that’s changed, not the genotype.

    Nutrition can make a difference, but the variation in skull thickness during the last 2 centuries is very minor compared to the amount of difference between Homo erectus, Neandertals and us. The thinning also preceded any significant shift from hunting and gathering to agriculture. There has been further thinning after agriculture, so that we can't attribute the shift to a straightforward diet change.

Subscribe to paleopathology

Neandertals

For years, I've worked on their bones. Now I'm working on their genes. Read more about the science studying these ancient people.

Denisova

From a finger bone of an ancient human came the record of a completely unexpected population. My lab is working on the science of the Denisova genome.

Acceleration

The advent of agriculture caused natural selection to speed up greatly in humans. We're uncovering some of the ways that populations have rapidly changed during the last 10,000 years.

Malapa

Just outside Johannesburg, the Malapa site is producing some of the most exciting finds in human evolution. This site is the headquarters of the Malapa Soft Tissue Project.