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Results for “Acromion”

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At least 19 recordsLinked to original sources
PubMedDate not supplied

[Widening of the sub-acromial space using a wedge osteotomy of the scapular spine. Anatomical bases, measurements on the preparation, studies of the kinematics of the acromion movements on a computer model].

We describe the theoretical principles of a new kind of decompression of subacromial impingement syndrome by means of a wedge osteotomy at the transition between acromion and spine of the scapula. The operation on cadaver bone and the simulation of acromion movement in a computer model demonstrate an increase of subacromial space more than 1 cm after wedge excision with cranial base of 5 mm and ventral base of 3 mm. After the excision of an anterior based wedge the resection of the coracoacromial ligament is not necessary. An angle between 50 and 60 degrees from mediocranial to laterocaudal referred to the transverse plane has been calculated as optimal. We regard the sparing of the abducting parts of deltoid muscle, the better approach to the cuff with the possibility to mobilize the supraspinate muscle in cases of greater cuff-tears and the possibility to obtain a smooth undersurface of the acromion as further advantages of this procedure. Further biomechanic experiments will be necessary to optimize osteosynthesis.

Acromion↗
PubMed1991

The profile view of the acromion.

A previously undescribed roentgenographic view shows the acromion in "profile." A sagittal view of the acromion outlines its bony architecture, specifically, the subacromial portion. This view is clinically useful in the perioperative evaluation of patients with impingement syndrome and can be especially revealing in some cases of persistent symptomatic impingement following previous acromioplasty. The view also provides an excellent perspective for roentgenographic examination of os acromiale. It is reproducible and relatively easy to obtain. The acromion is but one component of the subacromial arch, but this view is a valuable additional diagnostic tool to be used in evaluating the sometimes perplexing problem of impingement syndrome.

Acromion↗
PubMed1988

Tears of the rotator cuff of the shoulder associated with pathological changes in the acromion. A study in cadavera.

In 200 shoulders from cadavera, we studied the pathological changes on the undersurface of the acromion as associated with tears of the rotator cuff. After radiographic and histological analysis, we found that in the specimens that had a partial tear of the cuff the undersurface of the acromion was almost intact. Although a lesion in the anterior one-third of the undersurface of the acromion was always associated with a tear of the cuff, the reverse was not true. We concluded that the pathogenesis of most of the tears probably is a degenerative process.

Acromion↗
PubMed1977

Resection of the acromion in the treatment of persistent rotator cuff syndrome of the shoulder.

Partial or complete excision of the acromion was performed in 25 patients (29 shoulders) with long-standing pain in the shoulder typical of rotator cuff syndrome. There was no verified history of trauma in nine cases (13 shoulders), while injury was the cause of pain in 16 patients (16 shoulders). In nine shoulders there was a small and in two a large rupture of the rotator cuff. Twelve of the 13 non-traumatic shoulders became painless postoperatively and the pain was relieved in one. In the 16 traumatic shoulders the relief of pain was complete in six, partial in nine, and one remained unchanged. The condition was not aggravated in any of the cases. Mobility increased postoperatively in four cases and was in no case decreased by the operation. In this series the results were as favourable after partial as after complete excision of the acromion alone or excision in combination with other procedures appears to be a promising method of treatment of patients with long-standing rotator cuff syndrome.

Acromion↗
PubMed1992

Anatomy of the coraco-acromial arch. Relation to degeneration of the acromion.

We examined 200 scapular bones for signs of degenerative changes in the coraco-acromial arch. The slope and length of the acromion and the height of the arch were found to be most closely associated with degenerative change. These anatomical features are not significantly altered by current techniques of subacromial decompression.

Acromion↗
PubMed1989

[The reflex response in the abductor pollicis brevis muscle after tapping the distal segments of the fingers, the ulnar olecranon and scapular acromion. Electromyographic study].

The author made an electromyographic investigation of reflex responses in the abductor pollicis brevis muscle abductor pollicis brevis muscle after percussion with a hammer on the dorsal, lateral, palmar, medial and distal surface of the distal digit of the thumb, on the dorsal and palmar area of the distal digits of the other fingers and also on the olecranon ulnae and acromion scapulae. The investigation was made to detect the influence of the site of percussion on the character of the reflex response. The reflex responses were examined during slight isometric contraction of the muscle. After averaging rectification and of the recorded potentials the reflex responses were identified as excitatory and inhibitory modulation of the basal muscular activity depending on the inducing stimulus. Excitatory parts of the reflex response with a short latency were recorded after percussion on the lateral, dorsal and palmar area of the distal digit of the thumb and after percussion of the dorsal area of distal digits of the other fingers and after percussion of the palmar area of the little finger. As to other sites where reflexes were evoked first the inhibitory part of the reflex response was recorded. Excitation parts of reflex responses with a medium latency were obtained from all sites where reflexes were evoked. Late-latency parts of the reflex response had an inconstant occurrence. The results of the investigation provided evidence of a short-latency proprioceptory; influence of the abductor pollicis brevis muscle from synergic muscles.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1978

Ultrastructure of malignant histiocytoma arising in the acromion.

The ultrastructural features of a malignant histiocytoma of the acromial process of the scapula were studied. Material was obtained from two surgical biopsy specimens and an amputation specimen from the tumor. Cells possessing characteristics of histiocytes, fibroblasts, xanthoma cells, and multinucleated giant cells were present throughout the tumor. Smaller numbers of undifferentiated cells and lymphocytes were also observed. Intimate cytoplasmic interdigitations between adjacent tumor cells were found, and instances of degenerating intracytoplasmic cells, possibly representing phagocytosis, were observed. Specimens stained with periodic acid-Schiff reagent with and without exposure to diastase, examined by light microscopy, showed that numerous cells contained phagocytized material consisting of degenerating cells rather than cytoplasmic glycogen. Intraumor lymphocytes apparently represented an inflammatory reaction to the tumor. The tumor giant cells and xanthoma cells were probably modified histiocytes. Results of the study were compared with previous reports of ultrastructural studies of malignant histiocytoma of soft tissues. Fundamental similarities between such studies and this one suggested that the progenitor cell is a histiocyte, whether arising in bone or in soft tissues, and that the progenitor cell is capable of differentiation in both histiocytic and fibroblastic directions.

Acromion↗
PubMed1990

[Impingement syndrome of the shoulder in patients younger than 40 years, treated with partial acromion resection].

A retrospective analysis is reported of the results of partial acromioplasty of 22 shoulders in 19 patients with impingement problems. The population is younger than 40 years (mean 31). Four patients did not improve (18%). One (5%) showed a poor result and 14 patients (17 shoulders) (77%) had good or excellent results. The mean follow-up period was almost 3 years.

Acromion↗