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categories: ["bodies"]categories: ["bodies"]tags: ["prosthetics", "implants", "titanium", "amputation", "bone", "biomaterials"]tags: ["prosthetics", "implants", "titanium", "amputation", "bone", "biomaterials"]summary: "The direct structural fusion of living bone to a titanium implant, the biological principle underlying dental implants and skeletally anchored limb prostheses."summary: "The direct structural fusion of living bone to a titanium implant, the biological principle underlying dental implants and skeletally anchored limb prostheses."updated: "2026-07-27"updated: "2026-10-29"humanEvidence: "Dental implants have decades of routine clinical use in millions of patients; bone-anchored limbs rest on uncontrolled patient series reporting longer prosthesis wear time and better mobility, not on randomized trials."humanEvidence: "Dental implants have decades of routine clinical use in millions of patients; bone-anchored limbs rest on uncontrolled patient series reporting longer prosthesis wear time and better mobility, not on randomized trials."access: "Dental implants are a routine commercial procedure worldwide; bone-anchored limbs are performed at a small number of specialist centres, and the US screw-fixated system entered under a humanitarian exemption that caps volume."access: "Dental implants are a routine commercial procedure worldwide; bone-anchored limbs are performed at a small number of specialist centres, and the US screw-fixated system entered under a humanitarian exemption that caps volume."reversibility: "difficult"reversibility: "difficult"lines 70–78 → 70–7855 unchanged lines not shown
[[ { "year": "1952", "title": "Accidental discovery", "text": "Per-Ingvar Brånemark implants titanium optical chambers in rabbit bone to study microcirculation and finds at the end of the study that the chambers cannot be removed; bone has fused to the metal." }, { "year": "1952", "title": "Accidental discovery", "text": "Per-Ingvar Brånemark implants titanium optical chambers in rabbit bone to study microcirculation and finds at the end of the study that the chambers cannot be removed; bone has fused to the metal." }, { "year": "1965", "title": "First dental application", "text": "Brånemark places titanium fixtures in the jaw of Gösta Larsson, who had a cleft palate and no lower teeth; the implants remain functional for the rest of his life." }, { "year": "1965", "title": "First dental application", "text": "Brånemark places titanium fixtures in the jaw of Gösta Larsson, who had a cleft palate and no lower teeth; the implants remain functional for the rest of his life." }, { "year": "1977–1980s", "title": "Acceptance and extension", "text": "The dental establishment, initially sceptical, adopts the technique after long-term series are published; bone-anchored hearing aids and craniofacial prostheses follow." }, { "year": "1977-1980s", "title": "Acceptance and extension", "text": "The dental establishment, initially sceptical, adopts the technique after long-term series are published; bone-anchored hearing aids and craniofacial prostheses follow." }, { "year": "1990", "title": "First bone-anchored limb", "text": "Rickard Brånemark performs the first transfemoral osseointegrated prosthesis procedure in Gothenburg, using a screw-fixated design later commercialized as OPRA." }, { "year": "1990", "title": "First bone-anchored limb", "text": "Rickard Brånemark performs the first transfemoral osseointegrated prosthesis procedure in Gothenburg, using a screw-fixated design later commercialized as OPRA." }, { "year": "1999–2010s", "title": "Press-fit designs", "text": "German and Australian groups develop press-fit implants that shorten the two-stage protocol and broaden the eligible population." }, { "year": "1999-2010s", "title": "Press-fit designs", "text": "German and Australian groups develop press-fit implants that shorten the two-stage protocol and broaden the eligible population." }, { "year": "2015", "title": "US regulatory entry", "text": "The screw-fixated limb system receives a humanitarian device exemption in the United States, limiting the number of procedures but establishing a legal route." }, { "year": "2015", "title": "US regulatory entry", "text": "The screw-fixated limb system receives a humanitarian device exemption in the United States, limiting the number of procedures but establishing a legal route." }, { "year": "2020", "title": "Integration with neural interfaces", "text": "Self-contained arm prostheses combine skeletal attachment with implanted electrodes for muscle recording and nerve stimulation, used at home over years." } { "year": "2020", "title": "Integration with neural interfaces", "text": "Self-contained arm prostheses combine skeletal attachment with implanted electrodes for muscle recording and nerve stimulation, used at home over years." }]]lines 115–124 → 115–12436 unchanged lines not shown
antibiotics is common enough that most recipients experience at least one episode. Deep infectionantibiotics is common enough that most recipients experience at least one episode. Deep infectionand osteomyelitis are much less common but can require implant removal and further bone loss.and osteomyelitis are much less common but can require implant removal and further bone loss. Other complications include periprosthetic fracture — a fall transmits force directly into theOther complications include periprosthetic fracture, abutment breakage, aseptic loosening, andfemur rather than being absorbed by a socket, so a designed mechanical fuse in the connector issoft-tissue redundancy around the stoma requiring revision. A fall transmits force directly into thestandard — abutment breakage, aseptic loosening, and soft-tissue redundancy around the stomafemur rather than being absorbed by a socket, which is why a designed mechanical fuse in therequiring revision.connector is standard. Candidacy is restricted. Adequate residual bone length and quality are required, and poorlyCandidacy is restricted. Adequate residual bone length and quality are required, and poorlycontrolled diabetes, active infection, peripheral vascular disease, and heavy smoking are commoncontrolled diabetes, active infection, peripheral vascular disease, and heavy smoking are commonlines 132–158 → 132–1577 unchanged lines not shown
risk, a disagreement of the kind catalogued under [[disability-rights-and-enhancement]].risk, a disagreement of the kind catalogued under [[disability-rights-and-enhancement]]. > [!caution] Not a solved interface> [!caution] Not a solved interface> Bone-to-metal integration is reliable. Skin-to-metal is not. Every proposal for permanently> Bone-to-metal integration is reliable; skin-to-metal integration is not. Every proposal for> percutaneous hardware — limb anchors, transcutaneous power leads, the skull pedestals used in> permanently percutaneous hardware, whether limb anchors, transcutaneous power leads or the skull> academic [[brain-computer-interface]] research — inherits the same unsolved problem, and it is a> pedestals used in academic [[brain-computer-interface]] research, inherits the same unsolved> principal reason implanted systems are pushed toward fully wireless designs.> problem, and it is a principal reason implanted systems are pushed toward fully wireless designs. ## Beyond limbs## Beyond limbs Dental implants remain by far the largest application, performed in the millions annually. Bone-anchoredDental implants remain by far the largest application, performed in the millions annually.hearing devices route sound through the skull to the cochlea, bypassing a damaged outer or middleBone-anchored hearing devices route sound through the skull to the cochlea, bypassing a damagedear, and sit alongside the [[cochlear-implant]] in the hearing-restoration toolkit for a distinctouter or middle ear, and sit alongside the [[cochlear-implant]] in the hearing-restoration toolkitpatient group. Craniofacial prostheses — ears, orbits, noses — are retained on osseointegratedfor a distinct patient group. Craniofacial prostheses for ears, orbits and noses are retained onabutments where adhesive retention fails. Orthopaedic joint replacements rely on the sameosseointegrated abutments where adhesive retention fails. Orthopaedic joint replacements rely on thebone-implant biology, using porous coatings for cementless fixation. Skeletal anchorage has alsosame bone-implant biology, using porous coatings for cementless fixation. Skeletal anchorage hasbeen proposed as a load path for a wearable [[exoskeleton]], transferring force into bone ratheralso been proposed as a load path for a wearable [[exoskeleton]], transferring force into bonethan compressing soft tissue; no such system has been built for a person.rather than compressing soft tissue; no such system has been built for a person. The principle also constrains alternatives. Engineered bone grafts underEngineered bone grafts under [[tissue-engineering]] and acellular matrices of the kind described in[[tissue-engineering]] and acellular matrices of the kind described in[[decellularized-scaffolds]] aim at biological rather than metallic integration. Regrowing a limb[[decellularized-scaffolds]] aim at biological rather than metallic integration, and would removewould remove the percutaneous problem entirely, but nothing in [[limb-regeneration]] researchthe percutaneous problem entirely if a limb could be regrown; nothing insuggests that is available for mammals.[[limb-regeneration]] research suggests that is available for mammals. ## Outlook## Outlook lines 161–172 → 160–1712 unchanged lines not shown
implant geometries that reduce motion at the stoma. None has yet converted infection from a managedimplant geometries that reduce motion at the stoma. None has yet converted infection from a managedrecurring problem into a solved one.recurring problem into a solved one. The broader trajectory is convergence. Skeletal attachment, implanted neural electrodes, and poweredMore broadly, skeletal attachment, implanted neural electrodes, and powered actuators are beingactuators are being combined into single systems, so that the prosthesis is loaded through bone,combined into single systems, so that the prosthesis is loaded through bone, controlled by nerve,controlled by nerve, and provides feedback through both. That combination is what makes a prostheticand provides feedback through both. The combination makes a prosthetic limb behave less like a toollimb behave less like a tool and more like a limb, and it also sharpens the question raised underand more like a limb. It also sharpens the question raised under [[morphological-freedom]] and[[morphological-freedom]] and [[human-enhancement]]: whether people without amputations should ever[[human-enhancement]]: whether people without amputations should ever be offered a permanentbe offered a permanent skeletal port, and on what evidence a surgeon could justify one.skeletal port, and on what evidence a surgeon could justify one. ## See also## See also removed, struck through added, underlinedLine numbers count the serialised markdown of each revision, frontmatter included.
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