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Biomedical subjects

H K Tu

Publications and source records attributed to H K Tu.

16 recordsLinked to original sources
PubMed1988

Radiography after orthognathic surgery. Part I. Normal appearance.

Osteotomies of the mandible and/or maxilla (orthognathic surgery) are common procedures for correcting facial defects. Radiographs of these patients are routinely obtained, and the radiologist must be aware of the normal postoperative appearance as well as surgical complications that may occur. This article presents the common surgical procedures done (sagittal split, vertical subcondylar, genioplasty mandibular osteotomies; and Le Fort I and mid-palatal split maxillary osteotomies) and the routine appearance of uncomplicated procedures on posteroanterior skull and panoramic radiographs. The metallic immobilization devices and orthodontic appliances are also described.

Humans↗
PubMed1988

Radiography after orthognathic surgery. Part II. Surgical complications.

In a retrospective review of the radiographs from 100 patients who had undergone orthognathic surgery, the authors found that 10% of radiographs had evidence of surgical complications. These complications were fractures, temporomandibular joint dislocations, transected tooth roots, retained surgical devices, avascular necrosis, malunion or nonunion of osteotomy fragments, and osteomyelitis. Some of these complications are of little significance, while others require immediate intervention. Opacified maxillary sinuses and lucencies around tooth roots are frequent findings that may be confused with abnormalities; however, they represent postoperative blood in the sinuses and resorption of bone due to stress from orthodontic appliances, respectively.

Adult↗
PubMed1988

Pseudoankylosis of the mandible after temporal bone attached craniotomy.

Mandibular hypomobility after intracranial surgical procedures is seldom encountered. A case of limited oral opening after temporal bone attached craniotomy is described. The condition is due to fibrosis of the temporalis muscle resulting in a pseudoankylosis of the temporomandibular joint. The appropriate operative intervention is transoral coronoidectomy, which restores normal joint function.

Adult↗
PubMed1988

Erosive arthritis of the temporomandibular joint caused by Teflon-Proplast implants: plain film features.

Six patients had osseous destructive changes of the temporomandibular joint after placement of Teflon-Proplast implants for treatment of internal derangements. The implants were surgically removed from all six joints, and foreign-body reactions were found to account for the radiographic appearance. The plain film radiographic features included single or multiple osseous erosions of the mandibular condyle in all cases and the temporal bone of the glenoid fossa in two cases. Some erosions were poorly defined, whereas others were well defined, either with or without sclerotic margins. Radiologists must be aware of this possible complication of alloplastic temporomandibular joint implants in order to suggest the diagnosis in the appropriate clinical setting.

Adult↗
PubMed1987

Normal and abnormal temporomandibular joints: quantitative evaluation of inferior joint space arthrography.

Arthrography has been shown to provide important diagnostic information in patients with temporomandibular joint (TMJ) dysfunction. In this study, 60 arthrograms on totally asymptomatic patients and 64 arthrograms on symptomatic patients were evaluated. Quantitative evaluation of inferior joint space arthrography was performed with the help of a computer digitizing morphometry program. Results indicate a significant difference in the areas of the anterior and posterior recesses between normal and abnormal joints in the closed-mouth position. Differences between the 2 groups also exist in linear measurements of the anterior recess. This data further defines important diagnostic criteria in the arthrographic evaluation of both the normal and abnormal TMJ.

Adolescent↗
PubMed1987

Temporomandibular joint arthrography following surgical treatment of internal derangements.

Arthrograms of the temporomandibular joint were obtained in 20 symptomatic joints that had previous reconstructive arthroplasty with disk repositioning because of internal derangements. Preoperative arthrograms were available for comparison in 18 joints. Symptoms resulting in a postoperative arthrogram included pain, limited ability to open the mouth, and clicking of the joints. Postoperative arthrographic findings included limited anterior translation of the condyle (90%), irregularity in outline of the intraarticular contrast agent (60%), a conical configuration of the posterior recess (25%), decreased size of the joint (28%), anterior displacement of the meniscus (25%), and perforated meniscus (15%). Many of these findings may have resulted from fibrosis and scarring, which may be a response to intraarticular bleeding. The mechanism by which the fibrosis causes the postsurgical arthrographic features is discussed.

Adult↗
PubMed1987

The normal temporomandibular joint: MR and arthrographic correlation.

Magnetic resonance (MR) images of 28 normal temporomandibular joints were obtained and correlated with respective arthrograms. There was a spectrum in the configuration and thickness of normal articular menisci. The anterior band varied from thin with a flat inferior margin to thick with a bulbous, convex inferior margin. The anatomic configuration of the meniscus as seen with MR correlated directly with normal variations of the anterior recess seen with arthrography. Concavity of the superior aspect of the anterior recess as seen on arthrography was caused by a thick, bulbous anterior band of the meniscus, whereas a flat anterior recess resulted from a thin anterior band without a convex inferior margin. This study emphasizes that the appearance of a concave anterior recess on static arthrograms is not necessarily due to a displaced meniscus.

Adult↗
PubMed1986

Inferior joint space arthrography of normal temporomandibular joints: reassessment of diagnostic criteria.

Inferior joint space arthrograms of the temporomandibular joints of 31 healthy volunteers (62 joints) were obtained to determine normal arthrographic findings. The superior margin of the anterior recess was smooth and flat in 68% of the joints and concave in 32% with the subjects' mouths closed. The concavity was the result of the anterior ridge of the meniscus impinging on the contrast material. The concave impression could be distinguished easily from an anteriorly displaced meniscus on videotaped studies, which demonstrated a smooth transition of contrast material from the anterior to the posterior recess during opening of a subject's mouth. With the mouth open, the anterior recess decreased in size, appearing as a small, crescent-shaped collection of contrast material anterior to the head of the condyle in 52 joints (84%); it remained large in ten joints (16%) at maximal mouth opening. The configuration of the posterior recess was identical to that described previously; however, with the subjects' mouths closed, it was larger than the anterior recess, contrary to most previously reported results.

Adult↗
PubMed1984

Pneumomediastinum, pneumothorax, and cervical emphysema following mandibular fractures.

Subcutaneous emphysema of the neck and pneumomediastinum following facial trauma in the absence of neck, chest, or abdominal injuries is a rare entity. A case report of bilateral cervical subcutaneous emphysema, pneumothorax, and pneumomediastinum secondary to mandibular fractures is presented. The anatomic mechanism of injury, diagnosis, and treatment modalities are discussed.

Adult↗
PubMedDate not supplied

Left ventricular boundary detection from spatio-temporal volumetric computed tomography images.

This paper presents a new automatic technique for left ventricle boundary detection from a set of three-dimensional (3D) computed tomography (CT) volumetric cardiac images. The goals of this paper are to incorporate the temporal information into LV boundary detection, to link the shape modeling and LV boundary detection together, and to provide a compact representation of recovered LV boundaries to cardiac imaging. The proposed technique introduces spatio-temporal boundary detection and iterative model-based boundary refinement to left ventricular boundary extraction. The proposed technique has been applied to two sets of four-dimensional (4D) computed tomography images. Experimental results are compared with the manually edited images.

Algorithms↗