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    An innovative design of bipolar prosthesis
    An innovative design of bipolar prosthesis
    An innovative design of bipolar prosthesis
    Ebook206 pages1 hour

    An innovative design of bipolar prosthesis

    By Prof. Anil Kumar Rai

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    About this ebook

     Professor Anil Kumar Rai, a renowned teacher, innovator and outstanding orthopaedic surgeon of national repute has 25 years of rich experience in teaching, research guidance and administration. Prof. Rai served as Head, Department of Orthopaedics (2017-2020), Institute of Medical Sciences (IMS), Banaras Hindu University (BHU), Varanasi-221005. As Head of Orthopardics department of IMS, BHU Prof. Rai established PMR division in orthopaedics in 2018 under the central government funding and by now about 400 patients have been treated. Under this scheme various educational programs, distribution of tricycle, free camp, workshop, and lectures from eminent faculties for the benefit of PG students and the students of B.P.T and B.O.T in the field was organized. During his headship, the department has been enriched with many world class modern equipments and the much awaited course B.P.T and B.O.T was started successfully.
    Swami Paramgyananand Ji Maharaj Paramhans MEMORIAL Gold Medal was started by the University for the best MS ORTHOPARDIC student in the memory and inspirational source for the INNOVATION OF BHU HIP DEVICE innovated by Prof AK RAI .
    A project under HEFA (higher education financing agency) on “ADVANCE CENTER FOR SPINAL INJURY AND REHABILITATION”was sent by the department to meet the heavy load of spinal trauma victims in this area by the department during the tenure as HOD orthopedics. Andproject is under consideration for establishment of a separate center for these victims suffering from quadriplegia and paraplegia these are the patients mostly not looked after properly and or not treated either in the private hospital or government setup, because of unpredictable resultsand they need special care and attention.
    His innovative design and development of bipolar Hip prosthesis in collaboration with the Department of Mechanical Engineering, IIT (BHU) for its
    potential use in fracture neck femur and multiple hip joint disorder is a path breaking work in the field of orthopaedics; especially in the poor. Thecost effective device developed by Prof. Raipermits patients to sit cross-legged and squat which is not possible after total hip arthoplasty; this invention has been granted National patent No.216800‘bicentric Hip Device’. The Banaras Hindu University has named it ‘BHU-Hip Device’. He is member of Confederation of Indian industries(CII) and registered with the intellectual property of India for this piece of work. The work was appreciated in Indian orthopedic association meeting(IOA) in Kini memorial lecture by the president at indoor(2017) as Varanasi Bipolar. He developed the department in revision arthroplasty and complicated spinal surgery.Spondylolisthesis and spinal deformity abook onhis innovation"DESIGN CHANGES IN BIPOLAR PROSTHESIS THE BHU HIP DEVICE"is for publication for postgraduate student and medical colleges. Prof Rai has gained wide professional experience in the country and abroad. Prof. Rai was Common Wealth Fellow at Queen’s Medical Center Spinal Unit, University of Nottingham, Johnsons & Johnsons Fellow at Leicester university hospital U.K, Registrar, Orthopaedic Surgery at Limerick Regional &Croom Hospital, Ireland and St. Jame’s University Hospital, Dublin, Ireland. He was also Registrar in Orthopaedic Surgery at Mersey regional Hospitals, Liverpool, U.K. His foreign exposure includes Orthopaedic Surgeon at Central Hospital, Misurata, Libya, Registrar, Dept. of Ortho, Queen Elizabeth Hospital, Woolwich, London, Registrar, Ortho-Wythenshawe University Hospital, Manchester South Moor Road, M23 9LT.

    LanguageEnglish
    PublisherBlue Rose Publishers
    Release dateNov 3, 2023
    ISBN9798890089045
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      Book preview

      An innovative design of bipolar prosthesis - Prof. Anil Kumar Rai

      THE HIP JOINT

      The hip is a true ball-and-socket joint surrounded by powerful and well-balanced muscles, enabling a wide range of motion in several physical planes while also exhibiting remarkable stability. As the structural link between the lower extremities and the axial skeleton, the hips not only transmit forces from the ground up but also carry forces from the trunk, head and neck, and upper extremities. It meets the four characteristics of a synovial or diarthrodial joint: it has a joint cavity; joint surfaces are covered with articular cartilage; it has a synovial membrane producing synovial fluid, and; it is surrounded by a ligamentous capsule.

      The cup-shaped acetabulum is formed by the innominate bone with contributions from the ilium (approximately 40% of the acetabulum), ischium (40%) and the pubis (20%). In the skeletally immature these three bones are separated by the triradiate cartilage – fusion of this starts to occur around the age of 14 – 16 years and is complete usually by the age of 23.

      Ossification of the femur begins in the 7th fetal week. In early childhood, only a single proximal femoral physis exists. During the first year of life, the medial portion of this physis grows faster than the lateral, creating an elongated femoral neck by 1 year of age. The capital femoral epiphysis begins to ossify at approximately 4 months in girls and 5 to 6 months in boys. The ossification center of the trochanteric apophysis appears at 4 years in boys and girls. The proximal femoral physis is responsible for the metaphyseal growth in the femoral neck, whereas the trochanteric apophysis contributes to the appositional growth of the greater trochanter and less to the metaphyseal growth of the femur. Fusion of the proximal femoral and trochanteric physes occurs at about the age of 14 in girls and 16 in boys.

      The socket of the hip is completed by the inferior transverse ligament. Attached to the rim of the acetabulum is the fibrocartilaginous labrum. Although it makes less of a contribution to joint stability than the glenoid labrum in the shoulder it does serve its purpose. It plays a role in normal joint development and in distribution of forces around the joint. It has also been suggested it plays a role in restricting movement of synovial fluid to the peripheral compartment of the hip, thus helping exert a negative pressure effect within the hip joint.

      The labrum runs around the circumference of the acetabulum terminating inferiorly where the transverse acetabular ligament crosses the inferior aspect of the acetabular fossa. It attaches to the bony rim of the acetabulum and is quite separate from the insertion of the capsule.

      The labrum receives a vascular supply from the obturator and the superior and inferior gluteal arteries. These ascend in the reflected synovial layer on the capsule and enter the peripheral aspect of the labrum. It has been observed that labral tears are most likely to occur at the junction of labrum and articular cartilage - this area has been termed the ‘watershed region’.

      The femoral head is covered with a corresponding articular cartilage beyond the reaches of the acetabular brim to accommodate the full range of motion. The covered region forms approximately 60 to 70% of a sphere. There is an uncovered area on the central area of the femoral head – the fovea capitis – for the femoral insertion of the ligamentum teres. The ligamentum teres, while containing a blood supply does not contribute to the stability of the joint. It is covered in synovium, so while it is intra-articular it is actually extra-synovial.

      Angulation of femur

      There are two angulations made by the head and neck of the femur in relation to the shaft 1.Angle of torsion occurs in the transverse plane between an axis through the femoral head and neck and an axis through the distal femoral condyles (version of neck) 2.Angle of inclination occurs in the frontal plane between an axis through the femoral head and neck and the longitudinal axis of the femoral shaft (neck shaft angle).

      The head of the femur is attached to the femoral shaft by the femoral neck, which varies in length depending on body size. The neck-shaft angle is usually 125±5° in the normal adult. Coxa valga being the condition when this value exceeds 130° and Coxa vara when the inclination is less than 120°. The importance of this feature is that the femoral shaft is laterally displaced from the pelvis, thus facilitating freedom for joint motion. If there is significant deviation in angle outside this typical range, the lever arms used to produce motion by the abductor muscles will either be too small or too large.

      The neck-shaft angle steadily decreases from 150° after birth to 125° in the adult due to remodelling of bone in response to changing stress patterns.

      The femoral neck in the average person is also rotated slightly anterior to the coronal plane, this anterior inclination of head and neck with respect to shaft of femur is called antiversion and varies between 15-20 degree.

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