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The Anatomy of Joints Related to Function
Published in Verna Wright, Eric L. Radin, Mechanics of Human Joints, 2020
Stability is a dynamic concept and depends crucially upon maintaining adequate joint compression to overcome actual or potential distraction forces. Traditionally, factors maintaining joint stability are regarded as the shape of the articular surfaces, ligaments, and muscles. Only the hip joint has articular surfaces that are inherently stable in the absence of any other factors, the acetabular labrum gripping the femoral head just beyond its equator. Most ligamentous fibers are tight in only one position of a joint, often at the limit of motion, and most joints do not normally operate at these extremes in locomotor activities. Muscles are critically important stabilizing factors in the great majority of joints, particularly in the plane(s) of motion(s) (86,87).
Musculoskeletal system
Published in A Stewart Whitley, Jan Dodgeon, Angela Meadows, Jane Cullingworth, Ken Holmes, Marcus Jackson, Graham Hoadley, Randeep Kumar Kulshrestha, Clark’s Procedures in Diagnostic Imaging: A System-Based Approach, 2020
A Stewart Whitley, Jan Dodgeon, Angela Meadows, Jane Cullingworth, Ken Holmes, Marcus Jackson, Graham Hoadley, Randeep Kumar Kulshrestha
The hip joint is a synovial ball-and-socket joint formed between the head of the femur and the acetabulum of the innominate bone. The head of the femur comprises two-thirds of a sphere and the articular surface of the acetabulum is formed by a horseshoe-shaped ring of fibrocartilage. The femoral neck forms an angle of approximately 125° to the shaft and is directed anteriorly and superiorly to it. This requires the limb to be internally rotated if the neck is to be imaged without foreshortening. The joint capsule is a strong tense cylindrical sleeve that encloses the joint and the majority of the neck. It attaches to the trochanteric line on the femur anteriorly and 1 cm above the trochanteric crest posteriorly. It attaches to the rim of the acetabulum beyond the acetabular labrum where it merges with the tranverse ligament (Fig. 3.40).
Advances in Hip Arthroscopy
Published in K. Mohan Iyer, Hip Joint in Adults: Advances and Developments, 2018
A biomechanical analysis of the labrum suggests that it gets predominately stressed when faced with a compressive load. Therefore, excision or removal of the labrum may alter physiological functions such as enhancing joint stability and load distribution. Sensory fibres, mechanoreceptors and free nerve fibres densely populate the acetabular labrum, capsule and transverse acetabular ligament, suggesting their potential roles as the source of hip pain. It is found that the anterior zone of the labrum contains the highest relative concentration of sensory fibres [6,7].
Evolution of different designs and wear studies in total hip prosthesis using finite element analysis: A review
Published in Cogent Engineering, 2022
Chethan K N, Shyamasunder Bhat N, Mohammad Zuber, Satish Shenoy B
When the articular lunate surface is damaged over the years due to age or trauma the joint experiences wear. These wear debris biologically react with the blood cells and the patient may experience severe pain which results in constrained joint movement. The hip joint is surrounded by muscles as well as ligaments and its stability depends on the deep insertion of the femoral head into the acetabulum. A ring of cartilage surrounds the acetabulum of the joint referred to as the acetabular labrum which tightly holds around the head of the femur. Attachment of the capsule is the acetabulum with labrum and transverse ligament that bridges the acetabular notch inferiorly. The capsule is connected anteriorly to the intertrochanteric line and posteriorly about 15 mm proximal to the intertrochanteric crest on the femoral side. Thus, most of the femoral neck is intracapsular.