In a cave set into the limestone slopes of eastern Kalimantan on the island of Borneo, archaeologists have uncovered the remains of an individual whose fate overturns our understanding of prehistoric medicine. The person had lost their lower left leg in childhood -- not to an accident or predator attack, but to a deliberate surgical amputation performed with remarkable precision. And they survived. For at least six to nine years after the operation, they lived, moved (most likely with a perishable prosthesis or crutch) and participated in the life of their group. A 2022 study published in Nature1 by Tim Maloney and colleagues from Australian and Indonesian universities pushes the world's oldest documented complex surgery back by more than 20,000 years.
Liang Tebo: rock art and PleistocenePleistoceneThe geological epoch of the great ice ages (c. 2.6 Ma–11,700 BP), spanning most of human prehistory.→ burials
Liang Tebo cave is located in the Malinau district of northern East Kalimantan, Indonesia. This tropical limestone massif, systematically explored since the 2010s by an Australian-Indonesian team, is celebrated for its cave art, among the oldest in the world: negative hand stencils and animal representations dated to more than 40,000 years have been identified there. The cave has also yielded burials, including the one described here, radiocarbon-dated to approximately 31,000 years before present.
The burial was that of a young adult (age at death estimated between 19 and 25 years), associated with small amounts of ochreOchreA red or yellow mineral pigment (iron oxides), used from prehistory for adornment, funerary rites and art.→ and lithic material. It was during the anthropological analysis of the skeletal remains that the key discovery was made: the left lower limb was absent, and the distal ends of the left tibia and fibula displayed wholly exceptional morphological characteristics.
The bone ends were perfectly remodelled: the cut margins were smooth, regular, and covered with newly formed bone (callus) that had grown during the years following the intervention. No traumatic fracturing, no characteristic splintering from an accident, no sign of severe infection leading to necrosis -- everything points to a clean wound, made with a sharp instrument in a controlled manner, followed by long but complete healing.
A deliberate amputation performed with precision
Detailed morphological and histological analysis of the bone ends was conducted by X-ray tomography and scanning electron microscopy. The cross-section of the tibia and fibula reveals a clean transverse cut, made in one or more passes of a lithic instrument (obsidian flake or other sharp-edged stone). The absence of hesitation marks -- the multiple parallel striations characteristic of an uncertain hand -- suggests an intervention performed with confidence, perhaps by a "specialist" with experience of bone surgery.
Bone remodelling allows estimation of post-amputation survival time. Histological data indicate the individual survived at minimum six years after the operation, and probably more. Throughout this time, they maintained sufficient physical activity to stimulate bone remodelling at the stump -- implying they moved, most likely with the aid of a prosthesis or stick made of perishable material leaving no archaeological trace.
The question of anaesthesia and post-operative care is crucial. Amputation of a lower limb without pain management and wound care would very rapidly lead to death by shock, haemorrhage or infection. The Liang Tebo individual's survival implies that their contemporaries possessed effective means to control pain (anaesthetic or analgesic plants), stop bleeding (compression, ligature, cauterisation) and prevent infection (antiseptic plants, honey, medicinal leaves). The tropical rainforest of Borneo is exceptionally rich in medicinal plants, and the hunter-gatherer groups who inhabited it had probably accumulated over generations a highly sophisticated empirical pharmacopoeia.
Rethinking the origins of surgery
Before this discovery, the oldest known surgical amputation dated to approximately 7,000 years ago, documented at a NeolithicNeolithicThe "New Stone Age": a period marked by farming, herding, settlement and pottery, from around 10,000 BC.→ site in France (Buthiers-Boulancourt). Complex surgeries were generally assumed to have appeared with the first sedentary farming societies, whose division of labour allowed the existence of full-time medical specialists. The Liang Tebo amputation -- performed 24,000 years earlier, by nomadic tropical rainforest hunter-gatherersHunter-gatherersA way of life based on hunting, fishing and gathering wild resources, without farming or herding; it dominated almost the whole of human history.→ -- radically overturns this assumption.
It suggests that complex medical knowledge existed well before agricultureAgricultureThe cultivation of plants and production of food by working the soil, which emerged in the Neolithic in the Near East and independently elsewhere; it radically transformed human societies.→, probably transmitted orally across generations within hunter-gatherer groups. Such knowledge left almost no direct trace in the archaeological record, as it expressed itself in acts (surgical gestures, herbalism, wound care) and orally transmitted expertise rather than in durable objects. Liang Tebo may be one of the rare instances where a prehistoric medical act left its mark directly on the skeleton of its beneficiary.
The discovery also refocuses attention on Upper Pleistocene hunter-gatherer societies in Southeast Asia. Often perceived as driven solely by immediate survival and lacking elaborate "cultural" practices, these populations had in fact developed remarkable forms of social solidarity: caring for a severely disabled individual for years implies considerable communal investment, a sense of care and compassion usually associated with sedentary and hierarchised societies.
Prehistoric medicine in Southeast Asia
The island of Borneo occupies a special place in the record of complex cognitive behaviours during the Upper PalaeolithicUpper PalaeolithicThe final phase of the Palaeolithic (c. 45,000 to 10,000 years ago), marked by Homo sapiens in Europe, art, ornaments and a succession of cultures (Aurignacian, Gravettian, Solutrean, Magdalenian).→. The cave paintings of Lubang Jeriji Saleh cave (East Kalimantan province), dated to at least 40,000 years, are among the oldest known figurative representations in the world. The Liang Tebo amputation, dated to 31,000 years, fits within this context of an insular Southeast Asia that was already home to highly advanced symbolic and technical behaviours in the Upper Pleistocene.
Other discoveries of care for the sick and injured in this geographical and chronological context support this picture. Individuals bearing congenital disabilities or disabling injuries who survived for extended periods are documented at several Upper Pleistocene Asian sites, attesting to durable social solidarity. The Liang Tebo individual's survival for at least six years following amputation is one of the most striking examples of this phenomenon.
Future research in the limestone caves of Kalimantan could reveal additional similar cases. The region is rich in archaeological sites that remain poorly explored, and preservation conditions in tropical caves, while sometimes challenging, can be favourable for bone conservation. Liang Tebo may be only the first chapter of a prehistoric medical history far richer than we currently imagine.
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