(1) Thirteen patients had had a posterior dislocation with an associated fracture of the femoral head located either caudad or cephalad to the fovea centralis (Pipkin Type-I or Type-II injury), one had had a posterior dislocation with associated fractures of the femoral head and neck (Pipkin Type III), two had had a posterior dislocation with associated fractures of the femoral head and the acetabular rim (Pipkin Type IV), and three had had a fracture-dislocation that we could not categorize according to the Pipkin classification.
(2) The dimensions of the acetabular wall were thinner in the hips that had the thirty-two-millimeter component than in those that had the twenty-two-millimeter component (p less than 0.05).
(3) Forty metal femoral cups were matched with a cemented acetabulum, while with 46 the acetabular implant was cementless.
(4) Fifty-eight displaced central acetabular fractures treated surgically were followed from one to 12 years.
(5) The wear noted in the majority of components was much greater than that noted in wear studies of acetabular components in total hip prostheses.
(6) Endogenous factors such as acetabular dysplasia, increased anteversion of the femoral neck, capsular laxity support the genetic theory but they are neither constant nor necessary and are only facilitating factors.
(7) We concluded that the acetabular component of the Wagner prosthesis is prone to early loosening and that the early loosening is potentiated by a foreign-body response to debris resulting from arthroplastic wear.
(8) The reduction in the rate of aseptic loosening of the socket in our series, compared with the higher rates reported in similar long-term studies in which other acetabular components were used, supports the conclusion that there is enhanced longevity of acetabular fixation when a metal-backed acetabular component is used in cemented total hip arthroplasty.
(9) In cases with an acetabular index higher than 35 degrees acetabuloplasty is more effective.
(10) In this article, the improvements in cementing technique and cemented acetabular component design, as well as the evolution of noncemented acetabular cups, are reviewed.
(11) From these data, three-dimensional resultant forces on the hip and muscular forces around the hip were calculated through the computer in the normal and the postoperative states of Salter pelvic osteotomy, Chiari pelvic osteotomy and rotational acetabular osteotomy.
(12) The correction of the limb's position allows the subsequent correct development of the acetabular roof.
(13) In all cases high viscosity cement was used, but not under pressure; acetabular cartilage was removed, but the femoral canal was not plugged.
(14) In the hips with acetabular protrusion, preoperative values of the force were less than in that the trochanter united and postoperative increase in the abductor force was noted.
(15) In particular, pain was reduced in cases of mobilisation of the acetabular component, and persisted when mobilisation was in the femoral component.
(16) The initial injury had been a posterior dislocation without associated fracture of the acetabular wall, and the hip had not been immobilised or protected from weight-bearing during treatment.
(17) If the criteria for success of major superior acetabular allografts include incorporation of the graft and long-term stability of the implant, then the success rate in this series is very low.
(18) This preoperative acetabular index of 46 degrees improved to 28 degrees postoperatively, and proved to be the most reliable indicator for need of an added pelvic osteotomy.
(19) Major clinical findings include: asymmetric bilateral cryptophthalmos, unilateral orbital cyst of the nasofrontal area, bilateral anophthalmos, right choanal atresia, right microtia, right auditory canal atresia, hypodontia, ankyloglossia, cartilaginous synchondroses of the cervical vertebrae, and bilateral acetabular dysplasia.
(20) Quantification of acetabular coverage is important and can be expressed by superimposition of cartilage tracings on the maximum cross-sectional area of the femoral head.
Acetabuliform
Definition:
(a.) Shaped like a shallow cup; saucer-shaped; as, an acetabuliform calyx.