Case report 280: intraosseous lipoma of the tibia.
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Biomedical subjects
Publications and source records attributed to A B Goldman.
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By using patient radiographs and pathologic specimens, the bicipital groove of the humerus was studied to determine the normal configuration and common abnormalities of this region. Factors analyzed in evaluating the bicipital groove included the medial wall angle, depth and width of the intertubercular sulcus, and presence or absence of bony spurs arising from the floor or medial wall of the groove. The supratubercular ridge was observed as an osseous protuberance in about one-half of the population; it does not seem to be of pathologic significance. A specific radiographic projection is described, which allows evaluation of the bicipital groove.
The changes in gross morphology of the femoral head, specimen radiograms, cut sections of the femoral heads, and histopathology of the synovium were examined in 11 surgical specimens from six acromegalic patients who were treated by total hip arthroplasty. The pathologic changes in six age- and sex-matched patients also undergoing 11 total hip arthroplasties for idiopathic degenerative joint disease were examined for comparison. The hip joint changes in acromegaly represent a peculiar arthropathy, which is characterized by prominent, proboscis-like medial osteophytes, moderate chronic lymphoplasmacytic synovitis, an irregular pitting of the subchondral bone observed roentgenographically, and osteopenia. When compared with idiopathic degenerative joint disease, these changes are distinctive in extent, if not in quality. The pathophysiologic relationship between these entities remains obscure.
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Haglund syndrome is a common cause of posterior heel pain, characterized clinically by a painful soft-tissue swelling at the level of the achilles tendon insertion. On the lateral heel radiograph the syndrome is characterized by a prominent calcaneal bursal projection, retrocalcaneal bursitis, thickening of the Achilles tendon, and a convexity of the superficial soft tissues at the level of the Achilles tendon insertion, a "pump-bump." An objective method for evaluating prominence of the bursal projection is measurement using the parallel pitch lines. This measurement helps to identify patients with Haglund syndrome and patients predisposed to develop this condition, and also to differentiate local causes of posterior heel pain from systemic causes. The parallel pitch line measurement was determined in 10 symptomatic feet and 78 control feet and the results were analyzed statistically.
The radionuclide bone scan is a noninvasive screening procedure which can help in identifying or confirming subtalar coalitions in patients with foot and/or ankle pain of unknown origin in whom routine plain film studies are inconclusive. Five patients (seven symptomatic feet) with clinical and plain film findings suggesting a subtalar coalition are presented. The radionuclide bone scans in four patients (six feet) with documented subtalar coalitions demonstrated augmented uptake in the subtalar joint in all six feet and a secondary area of augmented concentration in the superior aspect of the talus or talonavicular joint in five feet. The radionuclide bone scan was normal in the one patient who was later proved not to have a coalition. The scans of 100 patients with foot pain of other etiologies were reviewed, and in no instance did the scan demonstrate the combination of subtalar and talus or talonavicular uptake observed in the patients with coalitions.
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A lucent femoral lesion was identified on the articular surface of the lateral femoral condyle in four young athletic males. The lesion occurred on the anterior aspect of the lateral femoral condyle just distal to the epiphyseal plate corresponding to the level of the patella. These patients had patellar femoral pain and symptoms consistent with "chondromalacia patellae" or one of the patellar pain syndromes. This femoral lesion has clinical and radiographic manifestations and probably a traumatic etiology similar to osteochondritis dissecans. Radiographically, the femoral lesion is not demonstrated on the routine anteroposterior, tunnel, or skyline views, and it is easily overlooked on the lateral view. The lesion can be identified radiographically on a Merchant view or on fluoroscopic spot films, and it is "hot" on a radionuclide bone scan. Once identified, arthrography and arthrotomography are useful to determine the integrity of the overlying articular cartilage.
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Hip arthrography is performed in order to visualize the structures which cannot be appreciated on plain films: the capsule, the synovium, and the articular cartilages. In infants and children, this contrast study also permits visualization of the cartilaginous portion of the femoral head and acetabulum. The prepubertal presence of these unossified structures makes the arthrogram relatively more informative in children than in adults.
Infantile coxa vara is an unusual localized dysplasia, not evident at birth, which is first noticed when the child begins walking. Twelve cases are presented with emphasis on the characteristic roentgen findings which include abnormal ossification of the femoral neck, a vertical physis, a characteristic triangular osseous fragment at the medial inferior corner of the metaphysis, and a straight femoral shaft. Prompt diagnosis and early management can reduce severe deformity and degenerative changes of the hip. For this reason, infantile coxa vara must be differentiated from other generalized and localized causes of coxa vara, including congenital dysplasias and acquired abnormalities.
"Popcorn" calcifications appear roentgenographically as a collection of scalloped radiolucencies, each with a sclerotic margin and in some instances, with central densities. The radiographs of 46 children with osteogenesis imperfecta were reviewed retrospectively; 52% had "popcorn" calcifications at one or more sites. A study of these children indicated that these lesions are observed only during active skeletal growth, are not present at birth, occur predominantly around the knees and ankles, and are associated with irregularity or absence of the normal horizontal growth plate. Based on multiple roentgen observations, "popcorn" calcifications appear to result from fragmentation and disordered maturation of the physis, and their presence indicates a disturbance in enchondral ossification which may contribute to the severe growth retardation associated with osteogenesis imperfecta.
The abnormal contour of the popliteus bursa, as examined on double-contrast arthrography, is an indicator of numerous disorders of the knee. Narrowing, compression, or complete absence of the popliteus bursa is associated with tears of the lateral menisci and with discoid menisci. Absence of the popliteus bursa can also be indicative of adhesive capsulitis, prior surgery, or a rare congenital anomaly. In addition, the popliteus bursa is a reservoir for intraarticular loose bodies. Normal variations of the popliteus tendon can also be observed arthrographically. Anatomic variants and abnormalities of the popliteus bursa are presented with emphasis on the spectrum of possible arthrographic findings. The detection of popliteus bursa abnormalities during arthrography should prompt further detailed examination. The embryology and anatomy of the popliteus bursa are reviewed.
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Radiographs of the hands and feet of 72 haemophilic patients were reviewed for peripheral joint involvement. Fifty patients or 69% had changes in the small joints of their hands and/or feet with a total of 160 abnormal joints. In the hands the metacarpo-phalangeal joints were predominantly involved (42 of 50 joints), and in the feet, the metatarso-phalangeal joints (68 of 110 abnormal joints), as well as the posterior subtalar joint (36 of 110 joints). Röntgen abnormalities were characterized by irregularity and/or flattening of the articular cortices. The involvement of the small peripheral joint in haemophilic patients has not been a primary consideration in previous clinical and radiographic studies because of the more common and more debilitating changes in the large joints. The recognition of involvement of the small joints is described to avoid misinterpretation of the röntgen findings and to appreciate the incidence of involvement, especially with the increased availability of replacement therapy.