The Occurrence and Possible Aetiology of Spondylolysis in a Pre‐contact California Population

The occurrence of spondylolysis (neural arch separation at the pars interarticularis) is reported in a pre‐contact (720–550 Cal BP) Central California population, CA‐CCo‐647 (n = 46). Spondylolysis was examined within this population to assess differences in sex, age, and possible relationships with biological affinity. Furthermore, prevalence rates of spondylolysis were compared across various populations to discern the aetiology of the defect. Within CA‐CCo‐647, spondylolysis was found in 17.4% (8/46) of the population. All occurrences are complete, bilateral separations of the neural arch in the lower lumbar (L4 and L5). The defect is not seen in individuals below the age of 18, and there is no correlation between adult age and spondylolysis. Male individuals display the defect at a higher rate (30.8% ‐ 4/13) than female individuals (12.1% ‐ 4/33); however, this is not a statistically significant finding. There does seem to be a correlation between an individual's sex and the onset of the defect; male individuals display spondylolysis at a younger age than female individuals. This finding could represent differences in activity patterns among young male and female individuals. In a biological distance analysis using craniometric data, male and female individuals with spondylolysis clustered closely, suggesting a genetic component for the defect. Finally, significant differences were found in spondylolysis prevalence between various populations representing distinct geographic and temporal settings. Significant differences were found among Native pre‐contact samples and even between two comparable pre‐contact California skeletal samples. These populations all engaged in distinct activities and were likely composed of genetically distinct groups of individuals, which may account for the differences in spondylolysis prevalence. All of these findings, both within CA‐CCo‐647 and between the various samples, suggest that the aetiology of spondylolysis is likely an interaction of genes and activity. Copyright © 2012 John Wiley & Sons, Ltd.     

Some types of vertebral pathologies in the Argar Culture (Bronze Age,SE Spain)

A collection of 1825 vertebrae belonging to 105 individuals from several Argaric Culture sites (Bronze Age, SE of Spain) were studied. Several pathologies that could provide information about activity patterns were analysed, including spondylolysis, compression fractures and Schmorl's nodes. Spondylolysis appears exclusively in men. Compression fractures seem to be more related to age (osteoporosis) and are more frequent in women, but without statistical significance. Schmorl's nodes affect a large number of the individuals studied, with a slight predominance in men; there are no differences by age. The results obtained were compared with the available archaeological and anthropological information, which shows a clear division of activities by sex in the Argaric population. The validity of studying these pathologies as activity patterns is discussed. Copyright © 2008 John Wiley & Sons, Ltd.     

Frequency of Complete Cleft Sacra in a Native American Sample

The purpose of this paper is to contribute to the current understanding of the variability of complete sacral clefts in human populations by presenting new data on a large prehistoric and historic Native American skeletal sample (n = 1943). Results are examined by age, sex, time period, and regional distribution and compared with reported frequencies of complete sacral clefts in other modern, historic, and ancient populations. In all, 1.6% of the sample exhibited complete sacral clefts, including 2.1% of males and 1.1% of females. Although males exhibit a frequency twice as high as females, this difference is not statistically significant. However, within the Alaskan sample, the sex difference was significant (p = 0.002), with 3.4% of males and 0.5% of females exhibiting complete clefts; these differences may be related to mechanical influences during growth and development in males. Differences among age groups are not significant. Regional comparisons among Alaska, Eastern Woodlands, Great Basin/Northwest/California, Great Plains, and Southwest showed no significant differences overall, but Alaska (2.2%) and Great Plains (0.5%) do show a significant difference (p = 0.024). No significant differences were found between prehistoric, protohistoric, and historic/recent samples, suggesting a lack of a secular trend in frequency of complete sacral clefts in Native American populations. One individual exhibited an enlarged canal, which may be indicative of a more severe condition. Copyright © 2012 John Wiley & Sons, Ltd.     

Sex differences in musculoskeletal stress markers: Problems with activity pattern reconstructions

This study examined six musculoskeletal stress marker (MSM) scores that showed reverse sex differences in the previously published research. MSM scores often differ by sex within a population. Most often females have lower MSM scores than do males; however, reverse sex differences do occur. If reverse sex differences are culturally specific, then these MSM scores are more likely caused by activity patterns than biology. Yet, if the same MSM scores show reverse trends in multiple populations, then perhaps these reversals may be the result of biological sex differences, such as hormonal differences and body size, or methodological reasons, such as MSM location. In the current study, deltoideus, pronator quadratus and trapezius MSM scores were significantly more pronounced in males in the California Amerind population examined. Most MSM scores examined significantly correlated with body size and age. With articular size and age controls, only the pronator quadratus and trapezius continued to display significant sex differences. Males had greater MSM pronator quadratus and trapezius scores than did females. The lack of sex differences in four out of six MSM scores may relate to the confounding factor of body size. Thus, it is suggested that some reverse sex differences in the published literature may not relate to activity patterns whereas other MSM sites show more promise. Copyright © 2010 John Wiley & Sons, Ltd.     

Spondylolysis in the lower thoracic–upper lumbar spine in a British medieval population

Spondylolysis is generally a condition of the lower lumbar spine, but occasionally it is observed at cranial to L4. It is generally agreed that spondylolysis in the lower lumbar spine represents fatigue failure of the neural arch. However, whether a biomechanical explanation is adequate to explain lesions cranial to L4 is disputed. Morphological aspects of spondylolysis at T12–L3 (five cases) are compared with those of lesions at L4–L6 (24 cases) in a mediaeval English skeletal series with the aim of shedding light upon any differences in aetiology of lesions at the two sites. It was found that spondylolysis at T12–L3 was more often unilateral than in L4–L6. In T12–L3, clefts more often took an angulated, dog‐leg course across the pars interarticularis, whereas most in L4–L6 were fairly straight and had an oblique orientation. In T12–L3, clefts often had facetted opposing surfaces suggestive of a diarthrodial joint, but this was only seen once in L4–L6. It is suggested on morphological grounds that facetted defects are more likely congenital than acquired. The need for consideration of factors in addition to activity regimes when interpreting spondylolysis in earlier populations is emphasised. Copyright © 2007 John Wiley & Sons, Ltd.     

Trauma and amputations in 19th century miners from Kimberley,South Africa

Trauma is the result of violent accidental or therapeutic events that cause physical or psychological injury. The frequencies and types of trauma within a population can give important information regarding their lifestyle as well as the quantity and quality of medical care available to them. The purpose of this study was to assess the incidence of trauma in the Gladstone sample population with regards to the presence of interpersonal violence a hazardous working environment strenuous working requirements and the availability of medical care. The individuals studied here were diamond miners from Kimberley dating to the late 19th century. A total of 107 well‐preserved skeletons were excavated from unmarked graves after accidental discovery. This sample included 86 males 15 females and 6 individuals of unknown sex. The majority of individuals (71%) were between 19 and 45 years of age. The remains were most likely those of migrant mine workers of low socioeconomic status who had passed away at the local hospitals. All bones were visually assessed for macroscopic indications of traumatic bone alterations and compared to standard palaeopathological texts and photographs. A total of 27% (n = 28) of the individuals in the sample presented with well‐healed healing or perimortem fractures. Fractures to the skull encompassed 49% (n = 20) of all the fractures that were observed. A total of six (6%) amputations were noted. Spondylolysis was observed in 7% (n = 7) of the individuals within the sample and longstanding subluxation was noted in two individuals. The high incidences of cranial fractures within this population are suggestive of high levels of interpersonal violence while long bone fractures spondylolysis and evidence of longstanding subluxations are indicative of the strenuous work requirements and the high‐risk environment to which these individuals were exposed. When considering the presence of well‐reduced fractures and healed amputations it seems that adequate medical care was available to at least some members of this community. Copyright © 2009 John Wiley & Sons Ltd. This article was published online on 17 February 2009. An error was subsequently identified. This notice is included in the online and print versions to indicate that both have been corrected 3 November 2009.     

A resampling approach to gender relations: the Rebešovice cemetery

Early Bronze Age society in Central Europe is often depicted as a society dominated by males. It is suggested that archaeological evidence is not always in agreement with this view. This study reports the analysis of mortuary variability at the Early Bronze cemetery Rebešovice in Moravia (Czech Republic) that uses computer-intensive resampling techniques. The results indicate that there are only minor differences in the mortuary treatment of females and males. There is neither a qualitative restriction of body treatment and objects buried with males, nor a quantitative emphasis on burials of males. In fact, burials of females are equipped with a higher number of bronze artifacts. Funerals of females were at least as significant social events as the funerals of males. We argue that the model of a male dominated community that used this cemetery is unwarranted. These findings do not refute the existence of gender-specific activities and roles that may be valued differently, but instead suggest that both females and males had access to resources from which they could draw power.     

Spondylolysis in non‐adult skeletons excavated from a medieval rural archaeological site in England

Spondylolysis is studied in a large series of non‐adult skeletons, ranging in age at death from 28 weeks gestation to 18 years old, from the deserted medieval village of Wharram Percy. The aim is to shed light on the age of occurrence of the lesion. Among those with complete lumbar spines, the prevalence of spondylolysis is 0.7%. The prevalence in adults from this group is 12% with no age patterning. Age of occurrence of spondylolysis in this population is inferred generally to be during late adolescent or early adult life. This contrasts with a published study of a modern reference group, unselected for activity patterns or medical complaints, which reported that in most cases spondylolytic defects had already formed by 6 years of age. The Wharram Percy group appeared to resemble rather more the pattern seen today in those involved in strenuous activities, such as competitive sports, both in the relatively late age of occurrence of defects and in the eventual high prevalence. This may be consistent with the observation that, during adolescence, individuals in medieval rural communities were beginning to take on adult tasks which would have been physically strenuous. However, it is unclear why individuals from Wharram Percy did not also form defects in early childhood as modern children appear to. A late age of occurrence appears consistent with published data which suggest a paucity of cases in non‐adults in British archaeological populations. Copyright © 2006 John Wiley & Sons, Ltd.     

Analysis of ante mortem trauma in three modern skeletal populations

When archaeological skeletons are assessed, the prevalence (and patterns of bone involvement) of trauma is important. The number and pattern of fractures can be used to gain insight into the occurrence of interpersonal violence, workload and living conditions. However, the question remains as to how these results should be interpreted—such as what constitutes high or low levels of trauma? The aim of this study was to investigate the occurrence of trauma in a population of modern Greeks living in Crete, as well as South African (SA) whites and blacks in the Pretoria Bone and Raymond Dart collections. The sample comprised mostly of older individuals (n = 90–100 within a sex‐population group). Each skeleton was studied for healed trauma. For the vertebrae, only spondylolysis was assessed. In the Greek sample, it was found that 42% of the males and 46% of females had at least one fracture, with corresponding figures of 63 and 44% for SA whites and 83 and 69% for SA blacks. Radius, rib and femur fractures were most common in Greeks, with skull, radius and ribs most common in SA whites and skull, ulna and ribs in SA blacks. These prevalences of trauma are high, but the composition of the samples (mostly of lower socio‐economic origin) should be kept in mind. It may also be questioned whether these individuals reflect the society as a whole. It seems that the fractures in Greeks are mostly related to old age due to falls and accidents (radius and hip fractures), while the SA black sample reflects high prevalences of interpersonal violence (such as cranial vault and ulna fractures). The SA white sample follows a comparatively moderate pattern of trauma. These comparative figures may be useful when assessing trauma in other skeletal populations. Copyright © 2009 John Wiley & Sons, Ltd.     

Sex identification from the distal fibula

This study was designed to determine whether the fibula, which is one of the least studied long bones, can provide reliable information for sexing of human bones, provided that one condition is satisfied, namely, its distal end is available for measurement. The materials consisted of the dried fibulae of 71 Japanese males and 35 females whose names, ages and sex were known. The distal end of the fibula was measured with respect to five novel dimensions that are closely related to the soft tissues that had been attached to the bone surface. Highly significant sex differences were found when all parameters examined were considered together. The differences for separate items were not, however, sufficient for sex discrimination. Discriminant analysis was performed using the five parameters and yielded the correct sex with 90. 6 per cent accuracy for the entire group of specimens. This degree of accuracy suggests the utility of the present method for sexing human bones, in particular, in osteoarchaeological situations.     

The effect of parity status on δN: looking for the “pregnancy effect” in 18th and 19th century London

This study examined the effect of parity status on δ¹⁵N using the well-characterised 18th and 19th century skeletal collection from the crypt of Christ Church, Spitalfields, London. We tested whether the cumulative effect of multiple pregnancies and breastfeeding could significantly reduce female δ¹⁵N values compared to males. The results from stable isotope analysis of 92 adult ribs show that the population of Spitalfields had relatively little variation in diet, compared to contemporary urban populations, and had abundant animal and marine protein. We were able to rule out any effect attributable to socio-economic status, date or age at death on the stable isotope ratios. There were no significant differences in δ¹⁵N due to parity status, nor were there any differences between males and females. Models of collagen turnover rates in ribs suggest that the effect of δ¹⁵N depletion due to pregnancy would be undetectable except in ideal circumstances, where bone of the optimal turnover period was sampled, and in cases where multi-parous individuals died shortly after parturition.     

Αge‐associated Variation and Sexual Dimorphism in Adult Cranial Morphology: Implications in Anthropological Studies

The current paper explores the impact of age and sex on adult cranial shape and size variation in the documented collections from St Bride's and Spitalfields. The scope is to assess the extent to which it is valid to pool age and sex groups in inter‐population comparisons that use cranial data. For this purpose, age and sex differences in cranial shape and size were explored using multivariate analysis of variance, Discriminant analysis and Mann–Whitney tests. The results suggest a clear change in cranial shape with increasing age; however, this change is not statistically significant. Therefore, it is justifiable to pool different age groups in bioarchaeological analyses. Increasing age also has a minimal impact on cranial size among females, whereas among males, its impact is small but statistically significant. Finally, cranial shape and size are significantly different between males and females, irrespective of their age. This dimorphism can be used for the assessment of sex, although attention should be given to over‐classification problems when using discriminant analysis. Copyright © 2012 John Wiley & Sons, Ltd.     

Provisioning of the Inka army in wartime: obsidian procurement in Pambamarca,Ecuador

Ninety-nine obsidian artifacts from fortified and non-fortified sites in the Pambamarca region of northern Ecuador were analyzed with XRF to examine patterns of procurement of obsidian by soldiers in the Inka army and by the local Cayambes who were resisting Inka conquest. The results show that the Inkas acquired material from several different sources, a pattern consistent with provisioning by subject peoples in partial fulfillment of labor obligations. The Cayambes also acquired material from multiple sources, although they may not have directly procured material from all of the sources because the external boundary of Inka territory bisected the region of obsidian sources. That frontier may have prevented the Inkas from accessing one source, Callejones, from which the Cayambes acquired some of their obsidian. In addition, the Inkas were acquiring some obsidian from the Yanaurco-Quiscatola source, which had been previously abandoned around AD 1000.     

舞阳贾湖墓葬的统计学初步分析

本工作旨在了解贾湖单人墓随葬品数量与墓主人性别、年龄以及墓葬分期之间的关系。根据墓葬样本的实际情况,本工作使用t-检验、单因素和双因素方差分析的方法进行了初步的统计学分析。结果显示,贾湖墓葬随葬品总量与性别无关,但与墓主人的死亡年龄有关,壮年随葬品较丰富。同时,随葬品数量受到性别和死亡年龄的交互影响比较显著,女性少年儿童的随葬品数量最多,男性壮年的随葬品次之。从随葬品的种类上看,除少年儿童组最多外,女性壮年墓葬占有石制品最多;男性壮年墓葬占有骨、牙制品最多。本工作还发现陶器和骨、牙制品的数量在不同时期存在着较显著变化,第二期时骨、牙制品和陶制品的数量较多。本工作认为,女孩随葬品数量较多的情况可能与母系氏族社会重女习俗有关,不同性别的壮年侧重随葬不同质地的物品则可能暗示着贾湖先民们已经出现了一定程度的社会分工,陶和骨、牙制品在第二期时比较丰富的现象可能与这一时期渔猎采集活动较活跃有关。     

Patterns of Cranial Trauma in a Prehistoric Population from Central California

Evidence of cranial trauma was investigated in a skeletal sample from the site CA-Ala-329 located on the eastern side of San Francisco Bay, Central California. The sample included 365 crania, including 134 adult males, 104 adult females, 22 adults of indeterminate sex and 105 subadults. Evidence of cranio-facial fracture was found in eight individuals, one of whom is an adolescent. Thus, the frequency in adult crania of traumatic injury is 7/260 (2.7 per cent). Of the seven individuals of known sex displaying such cranial trauma, all are male. The injuries are generally suggestive of some form of interpersonal aggression, with five healed vault fractures, one lesion with an embedded obsidian fragment (a probable projectile point) and two healed facial fractures. Further clear evidence of interpersonal aggression has been previously determined in this sample and has been reported at even higher levels elsewhere in California. © 1997 by John Wiley & Sons, Ltd.     

Enthesopathies and activity patterns in the Early Medieval Great Moravian population: Evidence of division of labour

Bone remodelling in the areas of entheses is frequently supposed to be associated with physical stress and the activity patterns of ancient populations. The main aim of this study was to analyse the prevalence of enthesopathies among individuals living in different life conditions. A total of 197 individuals from the Early Medieval (9th century) Mikulčice site were analysed for enthesopathies ‐ 117 adult individuals from Mikulčice castle and 80 individuals from its hinterland. While the inhabitants of the castle were probably ranked among the higher echelons of society, the hinterland was predominantly inhabited by a farming population. It is hypothesized that individuals from the castle were exposed to lower physical stress than individuals from the hinterland. 9 fibrocartilaginous entheses of the upper and lower limbs were evaluated. Enthesopathies occurred in at least one enthesis in 76% of individuals younger than 50 years of age. Significant differences were observed in the occurrence of enthesopathies between castle and hinterland. Males from the agricultural hinterland show the highest prevalence of enthesopathies of all the population groups, while the lowest prevalence of the marker was recorded in males from the castle. Females in the castle were more affected by entheseal changes than females from the hinterland. Sexual dimorphism was more evident in the hinterland. The present study confirmed presumptions based on the archaeological finds, especially for males. This hypothesis cannot be accepted for females. We may suppose that in the 9th century, women living in Mikulčice castle did not represent a privileged social class. Copyright © 2010 John Wiley & Sons, Ltd.     

Differences in cancer incidence between men and women in the province of Québec, Canada, 1984–1993

This research concerns variation in incidence rates of cancer for males and females aged 35 to 69 in Québec for the period 1984 to 1993. In analysing the data, the Island of Montréal (health region 06) was distinguished from the rest of the province of Québec (excluding Nunavik and the James Bay regions). Relative rate index and the ratio of standardised incidence rates of cancer for males and females showed similar tendencies in all regions studied, with the risk of non–sex‐specific cancer higher in men than in women (excess ranged from 5 or 20 to 240 percent according to the study region). However, this higher risk was not consistent across lifespan and cancer site in the Montréal area. We suggest some general points that could explain the differences in cancer incidence between males and females.     

Characterisation of obsidian subsource variability at El Paredón,Mexico

Portable X-ray fluorescence (pXRF) geochemical analysis on obsidian from five Formative period (1200 BCE to AC 100) sites from Tlaxcala, Mexico, has revealed that most of the material had similar values to those found in the closest obsidian source, named El Paredón, Puebla. Nevertheless, initial analyses did not resolve whether these materials came from the same caldera or from a specific obsidian deposit. Here we present a methodology that allows the identification of obsidian subsources. The results reveal that Tlaxcalan populations took advantage of a specific obsidian deposit called Tres Cabezas, Puebla, providing valuable new data to identify associated regional exchange networks.     

Age and exploitation of obsidian from the Medicine Lake Highland,California

The relationship between major and minor elements, trace element composition, and age of obsidian sources within a volcanic field, is of considerable interest for obsidian source and artifact research in the New and Old World. The present study investigates this relationship in the Medicine Lake Highland of western North America. Geological evidence had indicated a very young age for all obsidian sources in the Highland, yet archaeological evidence suggested that obsidian was utilized for several thousand years. X-ray fluorescence analysis distinguished the latest flow (Glass Mountain) from the Cougar Butte, Grasshopper Flat, and Lost Iron Wells sources. Data obtained from two nearby archaeological sites showed that obsidian from the latter two sources was used by c. 7500 bc, while Glass Mountain material was not used (or available) until after 1360± 240 bp. These findings indicate that inferences of an extremely recent age for all obsidian sources in the volcanic field were unwarranted. Further analysis of major and minor elements indicated different hydration rates for these sources. The results argue that significant geochemical variability, as well as age differences, can exist between obsidian sources within the same volcanic field.