• Abstract
  • Primary ExaminerRonald L. Frinks Attorney, Agent, or Firm-Owen, Wickersham & Erickson [5 ABSTRACT This prosthesis for replacement of a skeletal hinged joint comprises a unitary member of elastomer having a central hinge portion with a stem at each end, the stems being inclined with respect to each other. (google.ca)
  • bone
  • Each stem has a base adapted for insertion into a medullary canal of a bone of the joint. (google.ca)
  • In order to effect a repair of a hip joint which has been damaged it has been proposed to replace a damaged head of the femur with a metallic ball and also to insert in the hip bone a metal socket for receiving the ball. (google.com)
  • For these and other reasons, the use of a metallic ball and socket hip joint that just fills the acetabulum is mandatory to assure stability and fixation of the socket with respect to the hip bone. (google.com)
  • Joint prosthesis for implantation in a human or animal body comprises a joint member for mounting to a bone. (google.com)
  • Flexible tension transmitting wires are connected at their one ends to the joint member at a first location thereon, the ends of the wires being anchored in the bone at a location therein normally. (google.com)
  • A compression transmitting member has one end portion coupled to the joint member at a second location thereon different from the first location and its opposite end portion is anchored in said bone at a location therein normally subjected to compression forces. (google.com)
  • The components of the prosthesis are arranged to emulate as closely as possible the natural bone structure so that the forces exerted on the remaining bone approximate those applied to the normal bone. (google.com)
  • A joint prosthesis comprising two co-operating prosthesis members fastening each to a different joint bone. (google.com)
  • At least one of the prosthesis members is formed by at least two prosthesis elements one surrounding the other, the one prosthesis element adjacent the bone being provided with fastening means. (google.com)
  • At least one of the prosthesis members is formed by at least two prosthesis elements one surrounding the other, the one prosthesis element adjacent the bone being provided with fastening means distributed along the outer face and being located inside the outer face when the joint prosthesis is being applied, out of which outer face they can subsequently be moved in order to cause them to penetrate into the bone. (google.com)
  • Furthermore, the contact faces of the two prosthesis elements could be provided with coating mimicing the elastic and/or resilient features of bone. (google.com)
  • Bacteria can enter the joint by: The bloodstream from an infection elsewhere (most common) Direct penetration into the joint A surrounding infection in the bone or tissue (uncommon). (wikipedia.org)
  • Roentgen stereophotogrammetry (RSA) is a highly accurate technique for the assessment of three-dimensional migration and micromotion of a joint replacement prosthesis relative to the bone it is attached to. (wikipedia.org)
  • To achieve the high accuracy, the following steps are carried out: Small radio opaque markers are introduced in the bone and attached to the prosthesis to serve as well-defined artificial landmarks. (wikipedia.org)
  • Two synchronised x-ray foci are used to obtain a stereo image of the bone and the prosthesis. (wikipedia.org)
  • The coordinates of the bone and prosthesis markers are accurately measured and the three-dimensional position of the markers is reconstructed using software. (wikipedia.org)
  • The change in the position (translation and rotation) of the prosthesis markers relative to the bone markers is then determined. (wikipedia.org)
  • The Journal of Bone and Joint Surgery. (wikipedia.org)
  • Bone cements have been used very successfully to anchor artificial joints (hip joints, knee joints, shoulder and elbow joints) for more than half a century. (wikipedia.org)
  • Artificial joints (referred to as prostheses) are anchored with bone cement. (wikipedia.org)
  • The bone cement fills the free space between the prosthesis and the bone and plays the important role of an elastic zone. (wikipedia.org)
  • The excellent tissue compatibility of PMMA allowed bone cements to be used for anchorage of head prostheses in the 1950s. (wikipedia.org)
  • Bone cement is considered a reliable anchorage material with its ease of use in clinical practice and particularly because of its proven long survival rate with cemented-in prostheses. (wikipedia.org)
  • Embolisms can always occur during anchorage of artificial joints when material is inserted into the previously cleared thigh bone cavity. (wikipedia.org)
  • Complex treatment of osteosarcoma patients- In: 2nd International Workshop on the design and application of tumor prosthesis for bone and joint reconstruction. (wikipedia.org)
  • Interpositional arthroplasty, previously a popular form of arthroplasty, with interposition of some other tissue like skin, muscle or tendon to keep inflammatory surfaces apart Excisional or resection(al) arthroplasty in which joint surface and bone is removed. (wikipedia.org)
  • One variant of is the Stainsby procedure which consists of excision of part of a proximal phalanx in a metatarsophalangeal joint, reduction of the plantar plate and kirschner wire fixation of the metacarpal bone to the remaining phalanx. (wikipedia.org)
  • thereon
  • The ball joint member which preferably takes the form of a nail to be driven axially of the femur is provided with means which permits the adjustment of the neck and the ball thereon angularly around the nail after it has been inserted in the femur so that when the ball is properly adjusted, the patients foot will align properly and will not toe out or toe in when in use. (google.com)
  • tensile
  • The hinge has a web portion lying between thicker end portions adjoining the stems, to provide uniplanar hinging movement, the angle of inclination lying in this plane and providing a suitable normal rest position for the joint where the prosthesis has no restorative tensile or compressive forces. (google.ca)
  • thereof
  • 10. A joint prosthesis kit as defined in claim 1, further comprising a radiator means accommodated within said pressing means for irradiating said prepreg member to harden the hardenable material thereof. (google.co.uk)
  • femur
  • In theory, if such a ball and socket joint is properly designed, it may be inserted with little or no more surgery than is required for replacing the damaged neck and head of the femur with the present available male prosthesis. (google.com)
  • This arrangement of the ball member for adjustment relative to the femur after insertion of the anchoring male constitutes a great advance over the prior art male prosthesis which must be accurately aligned during the application to the femur and thus require great precision in the surgical repair of the hip joint. (google.com)
  • silicone
  • References Cited UNITED STATES PATENTS 2,679,245 5/1954 Timmermans 128/92 CA OTHER PUBLICATIONS Silicone Rubber Implants for Replacement of Arthritic or Destroyed Joints in the Hand, by A. Swanson, Surgical Clinics of North America, Vol. 48, No. 5, Oct. 1968, pp. 1113-1127. (google.ca)
  • Mold arthroplasty, Silicone replacement arthroplasty Osteotomy to restore or modify joint congruity Arthroplasty presents various and continuous challenges to the engineer and surgeon. (wikipedia.org)
  • prosthetic joint
  • Can be caused by skin infection, previously damaged joint, prosthetic joint, or intravenous drug use. (wikipedia.org)
  • coagulase-negative staphylococci - usually due to prosthetic joint Streptococci - the second most common causeStreptococcus pyogenes - a common cause in children under 5 Streptococcus pneumoniae Group B streptococci - a common cause in infants Haemophilus influenzae Neisseria gonorrhoeae - the most common cause of septic arthritis in young, sexually active adults. (wikipedia.org)
  • Rifampicin is sometimes used in the treatment of methicillin-resistant Staphylococcus aureus (MRSA) in combination with fusidic acid, including in difficult-to-treat infections such as osteomyelitis and prosthetic joint infections. (wikipedia.org)
  • Implants
  • It is important to understand material degradation processes for joint implants to achieve longer service life and better safety issues for such devices. (wikipedia.org)
  • infection
  • Septic arthritis, also known as joint infection or infectious arthritis, is the invasion of a joint by an infectious agent resulting in joint inflammation. (wikipedia.org)
  • Most commonly joints becomes infected via the blood but may also become infected via trauma or an infection around the joint. (wikipedia.org)
  • Age over 80 years Diabetes mellitus Osteoarthritis Rheumatoid arthritis Immunosuppressive medication Intravenous drug abuse Recent joint surgery Hip or knee prosthesis and skin infection HIV infection Other causes of sepsis Having more than one risk factor greatly increases risk of septic arthritis. (wikipedia.org)
  • P. acnes is an opportunistic pathogen, causing a range of postoperative and device-related infections e.g., surgery, post-neurosurgical infection, joint prostheses, shunts and prosthetic heart valves. (wikipedia.org)
  • osteoarthritis (OA) rheumatoid arthritis (RA) avascular necrosis (AVN) or osteonecrosis (ON) congenital dislocation of the hip joint (CDH) Hip dysplasia (human) acetabular dysplasia (shallow hip socket) frozen shoulder, loose shoulder traumatized and malaligned joint joint stiffness Infection Bleeding Periprosthetic fracture Loosening Mechanical wear Failure Rheumasurgery Hip Replacement Knee replacement Wrist osteoarthritis Khan, W.S. (wikipedia.org)
  • insertion
  • 8. A joint prosthesis kit as defined in claim 1, further comprising an insertion means situated in said pressing means for removably receiving a hardening means for hardening the hardenable material of said prepreg member. (google.co.uk)
  • 16 . A disc prosthesis according to claim 1 which is provided for anterior insertion. (google.com.au)
  • surface
  • said prepreg member, after introduction into said intramedullary cavity, is, by inflating said fluid-impervious pressing means inside said prepreg member by introduction of a fluid thereinto through said nipple, expandable against the surface of the intramedullary cavity such that the prepreg member conforms to the surface of the intramedullary cavity where, upon hardening, said prepreg member forms a hard shell constituting a sole anchoring member of the prosthesis. (google.co.uk)
  • The cause of the low polymerization temperature in the body is the relatively thin cement coating, which should not exceed 5 mm, and the temperature dissipation via the large prosthesis surface and the flow of blood. (wikipedia.org)
  • Arthroplasty (literally "[re-]forming of joint") is an orthopedic surgical procedure where the articular surface of a musculoskeletal joint is replaced, remodeled, or realigned by osteotomy or some other procedure. (wikipedia.org)
  • For the last 45 years the most successful and common form of arthroplasty is the surgical replacement of arthritic or destructive or necrotic joint or joint surface with prosthesis. (wikipedia.org)
  • septic arthritis
  • Septic arthritis most commonly causes pain, swelling, and warmth at the affected joint. (wikipedia.org)
  • Therefore, those affected by septic arthritis will often refuse to use the extremity and prefer to hold the joint rigidly. (wikipedia.org)
  • Septic arthritis is most commonly caused by bacteria reaching the synovial membrane of a joint. (wikipedia.org)
  • cause septic spinal arthritis Eikenella corrodens - human bites Pasteurella multocida, bartonella henselae - animal bites or scratches Fungal species - immunocompromised state Borrelia burgodorferi - ticks, causes lyme disease Septic arthritis should be considered whenever a person has rapid onset pain in a swollen joint, regardless of fever. (wikipedia.org)
  • The diagnosis of septic arthritis is based on physical exam and prompt arthrocentesis which yields synovial fluid from within the affected joint. (wikipedia.org)
  • Rarely, it infects heart valves leading to endocarditis, and infections of joints (septic arthritis) have been reported. (wikipedia.org)
  • means
  • 3. A joint prosthesis kit as defined in claim 1, further including means for introducing a fluid comprising a hose to be accommodated within said pressing means and having an end for connection to a fluid source. (google.co.uk)
  • A hip joint prosthesis includes connection means for securing the hip joint prosthesis to a securing device and to an artificial leg, and a control unit for controlling an extension movement in the hip joint and for controlling the step length of the artificial leg. (google.com)
  • The fastening means are formed by pins guided in passages of the prosthesis element. (google.com)
  • This means that over the stance phase, depending on the speed the subject is moving, there is a derivable torque angle relationship that can be used to control a lower limb prosthesis. (wikipedia.org)
  • socket
  • The use of a metal socket as well as a metallic male head prosthesis is intended to eliminate pain, wandering of a ball in the acetabulum and to diminish motion of the hip. (google.com)
  • However, as a practical manner, the metallic ball and socket joints designed heretofore have been difficult to use and apply and have not been completely satisfactory. (google.com)
  • replacement
  • Prostheses currently available for replacement of hinged joints, such as elbows, knees and joints of the hand, are either rigid metal or plastic hinged devices or are softer elastomeric devices such as those for knuckle joints of the hand disclosed in U.S. Pat. (google.ca)
  • more intense research into artificial facet replacement as an effective and marketable prosthesis has been ongoing since the mid-2000s. (wikipedia.org)
  • important
  • For lower limb robotic prosthesis it is important to be able to determine if the user wants to walk on level ground, up a slope, or up stairs. (wikipedia.org)
  • type
  • Each patient that uses a robotic prosthesis that is tuned for this type of control has to have there system trained for them specifically. (wikipedia.org)
  • It is an elective procedure that is done to relieve pain and restore function to the joint after damage by arthritis or some other type of trauma. (wikipedia.org)
  • available
  • However, about 300 of the standards produced by ISO and IEC's Joint Technical Committee 1 (JTC1) have been made freely and publicly available. (wikipedia.org)
  • different
  • The speed-adaption mechanism is a mechanism used to determine the required torque from the joints at different moving speeds. (wikipedia.org)
  • patient
  • Using X-rays and other scans of the patient as well as modern 3D printing, personally tailored prosthesis are a reality for more and more individuals. (wikipedia.org)
  • blood
  • White blood cells of greater than 50,000 mm3 or lactate greater than 10 mmol/l in the joint fluid also makes the diagnosis likely. (wikipedia.org)
  • Joints with preexisting arthritis, such as rheumatoid arthritis, are especially prone to bacterial arthritis seeded through the blood stream. (wikipedia.org)
  • pain
  • Symptoms typically include redness, heat, and pain in a single joint associated with a decreased ability to move the joint. (wikipedia.org)
  • The prosthesis is indicated for back and leg pain caused by central or lateral spinal stenosis, degenerative disease of the facets with instability, and grade 1 degenerative spondylolisthesis with objective evidence of neurological impairment. (wikipedia.org)