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The apophysis is a normal secondary ossification center that is located in the non-weight-bearing part of the bone and eventually fuses with it over time (most of the apophyses fuse during the 2nd decade of life, but this process can be delayed, especially in female athletes). The apophysis is a site of tendon or ligament attachment, as compared to the epiphysis which contributes to a joint, and for that reason, it is also called 'traction epiphysis'.
Articles: Epiphysis Apophysis of the proximal 5th metatarsal Metaphysis Aneurysmal bone cyst Terms used in radiology Bone macroscopic structure Metadiaphysis Apophyseal avulsion fractures of the pelvis and hip Apophyseal stress injury Endochondral ossification Avulsion fracture of the 5th metatarsal styloid Cartilaginous joints Calcaneal apophysis Multicentric ossification Synchondrosis Diaphysis Epiphyseal equivalent Physis Metaepiphysis Cases: Sever disease (calcaneal apophysitis) Bipartite 5th metatarsal apophysis 5th metatarsal bone bifid apophysis Fifth metatarsal apophysis Calcaneal apophysitis - Sever disease Traction apophysitis of left anterior superior iliac spine Multiple choice questions: Question 2238
In scoliosis, most of the deformity is in the disc and occurs during the period of rapid growth. The ring apophyses form the insertion of the disc into the vertebral body, they then ossify and fuse to the vertebrae during that same crucial period. Although this must have important implications for the mechanical properties of the spine, relatively little is known of how this process takes place. This study describes the maturation pattern of the ring apophyses in the thoracic and lumbar spine during normal growth. High-resolution CT scans of the spine for indications not related to this study were included. Ossification and fusion of each ring apophysis from T1 to the sacrum was classified on midsagittal and midcoronal images (4 points per ring) by two observers. The ring apophysis maturation (RAM) was compared between different ages, sexes, and spinal levels. The RAM strongly correlated with age (R = 0.892, p < 0.001). Maturation differed in different regions of the spine and between sexes. High thoracic and low lumbar levels fused earlier in both groups, but, around the peak of the growth spurt, in girls the mid-thoracic levels were less mature than in boys, which may have implications for the development of scoliosis.
A 9.5-month-old, female entire, 31.3 kg crossbred dog was presented with a 12 week history of moderate weight-bearing right pelvic limb lameness. Radiographic, computed tomographic, and ultrasonographic imaging revealed progressive avulsion fragmentation of the right tibial tuberosity apophysis and a patellar tendon insertional enthesopathy without physeal involvement. Conservative management was successful in achieving a good clinical outcome. A progressive avulsion of the contralateral proximal tibial physes that occurred concurrently resulted in development of an excessive tibial plateau slope angle. The additional development of a moderate left distal femoral varus deformity was surgically corrected. This is the first report of a progressive, traction injury to the tibial tuberosity apophysis in a dog that appears clinically and radiographically very similar to Osgood-Schlatter disease in humans.
The last ossification centers to appear and develop are the iliac crest apophysis and, finally, the apophysis of the ischial tuberosity. The latter is smaller, more difficult to visualize in roentgenogram and thus is of little significance, whereas the iliac apophysis is plainly visible and has a rather long time element in its development.
An apophysis is a growing center which, as its name indicates, grows (physis) upon (apo) the mother bone. It differs from the epiphysis in that with the development of the ossification center all growth is completed.
Coincident with the development of the excursion of ossification of the iliac apophysis across the iliac crest, the vertebral growth plates are completed, and spinal growth is finished. It is difficult to visualize the vertebral body growth plates and determine growth completion. Because of an almost simultaneous development of the iliac apophysis and the vertebral growth plates, vertebral growth completion can be determined by observation of the development of the iliac apophysis.
In the anteroposterior roentgenographic view of the pelvis, the iliac apophysis appears laterally and anteriorly on the crest of the ilium as an ossification center. This is termed capping (Fig. 1). With continued growth it develops posteriorly in its excursion of ossification across the iliac crest to dip down to contact the ilium medially at its junction near the sacrum. This is considered to be attached or completed (Fig. 2). When this completed ossification occurs, vertebral growth can be considered to be complete. Closure of the line between the apophysis and the ilium has no vertebral growth significance. Two or 3 years may be required for its closure.
Shows the posterior capping of the iliac apophysis. (See arrows over the pelvis.) This boy also had a congenital anomaly at 13. He was an untreated case, followed over a period of 10 years, during which period his curve Increased over 20 until completion of the iliac apophysis.
(Left) Shows a girl of 16 with an untreated curve of 30. Her apophysis has attached with a slight interruption of the excursion across the left pelvis. (See arrow.) (Right) Shows the girl over 15 years later. She is now a young adult. Although it has been 15 years since her last roentgenogram was taken, showing a curve of 30 and an attached iliac apophysis, her curve remained unchanged at 30. The iliac apophysis has solidified and is now a part of the ilium. (See arrows.)
The iliac apophysis may develop in fragments. After the usual capping or the appearance of ossification anteriorly and laterally on the iliac crest, further development may occur posteriorly, leaving a space, or gap, to be filled in later.
Variations in development of the iliac apophysis may occur. Earlier development usually takes place on the iliac crest of the high side of a pelvis seen with leg-length difference. Posterior ossification of the apophysis has been seen in the occasional congenital spinal deformity and in the infantile pelvis of some polios.
The excursion of ossification of the apophysis may be short and appear to attach to the ilium at a distance one half to three quarters across the iliac crest. In these cases the initial ossification center is thicker than usual. These are termed short excursions (Fig. 4). Vertebral growth usually is completed with the short excursion of the apophysis.
Shows an iliac apophysis which was attached at about 75 per cent of the customary excursion. (See arrow over the left pelvis.) The curve did not increase after this attachment. This is called a short excursion of ossification of the iliac apophysis.
The average chronologic age when the iliac apophysis is completed is 14 years in girls and 16 years in boys. It may occur as early as 10 or 11 years in girls and 13 or 14 in boys, and as late as 17 or 18 years in girls or 20 years in boys. Delayed development occurs in children in colder climates or in those whose metabolism is low. Early development of the apophysis occurs in warmer climates. These observations on the development of the iliac apophysis were begun in 1936 at the Los Angeles Orthopaedic Hospital and continued intensively for 10 years. The object of this study was to find some physiologic sign that would indicate the completion of vertebral growth.
(Top, left) Girl, 11 years of age, had polio at the age of 8, with mild appearance of the lateral curvature at the dorsolumbar junction. No iliac apophysis is seen at the age of 11. (Top, right) At the age of 14 it is noted that the iliac apophysis is complete, and there has been a noticeable increase in the deformity. (Bottom, left) At the age of 18 there has been no further increase in the deformity since the completion of the iliac apophysis. (Bottom, right) This is an untreated case. Also at the age of 21 there has been no appreciable increase in the deformity since the completion of her iliac apophysis. (Risser, J. C.: J.A.M.A. 164:135.)
The vertebral growth plates are not easily visible in a roentgenogram; therefore, they did not furnish reliable information of vertebral growth. The completion of the excursion of the ossification of the iliac apophysis generally was coincident with that of the vertebral growth plates. Therefore, the attachment of the iliac apophysis has proved to be an excellent physiologic sign (to indicate the completion of vertebral growth.
Two hundred untreated cases examined at the Los Angeles Orthopaedic Hospital were studied as to vertical heights standing, sitting and kneeling, measurement of the scoliotic deformity and development of the excursion of ossification of the iliac apophysis across the crest of the ilium. In general, the correlation was very favorable. The sitting height was not 100 per cent accurate. Variations were noted with fatigue of the patient and the addition to sitting height by the development of the ischial apophysis and increase in buttock size in fat girls.
Ten per cent of the cases showed no increase in scoliotic deformity, even though iliac apophysis was not complete and attached. This was especially difficult to determine in those cases with a short excursion of the iliac apophysis. During the past 20 years 3 cases have been reported which showed roentgenographs evidence of an increase in the scoliotic deformity following completion, and even posteromedial attachment of the iliac apophysis. This increase in deformity continued only 3 to 6 months after the development of the apophysis and averaged 10. The coincidental development of the vertebral growth plates and the excursion of ossification of the iliac apophysis is not 100 per cent as seen in these 3 cases. This correlation was found in all cases, irrespective of etiology.
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