Biomedical subjects

S Haman

Publications and source records attributed to S Haman.

At least 19 recordsLinked to original sources

PubMed2000

Congruity of the subtalar joint in tongue fracture of the calcaneus: an anatomical study.

STUDY DESIGN: An anatomic study. OBJECTIVES: To evaluate the effect of displacement of the fractured posterior facet in tongue fracture of the calcaneus on the congruity of the subtalar joint. METHODS: Eleven feet were used in this study. Seven females and four males with age range from 59 to 78. The specimens were dissected from both the lateral and the medial aspects of the calcaneus to expose these surfaces. A primary fracture line was created first, then a secondary line was engineered to simulate tongue fracture. Displacement of the superio-lateral fragment was done with 5-mm increment. Radiography was performed and the graphs were scanned and studied on specific computer software to explore the effects of displacement on joint congruity. RESULTS: The anterior end of the fragment of the tongue fracture, when displaced, not only is depressed but also rotated in the sagittal plane in a downward or planterward direction. The articular surface of the posterior facet of the calcaneus and the inferior facet of the talus are maintained in congruence with each other despite the varying degree of displacement and rotation. CONCLUSION: Congruity of the subtalar joint in tongue fractures is maintained despite different degrees of displacement. This study explains why the non-surgical treatment outcome is comparable to that of the operative treatment in tongue fractures of calcaneus. It also explains why tongue fractures have a good outcome with closed reduction.

Aged↗

PubMed1999

Radiographic evaluation of talonavicular joint after talar screw placement: a cadaver study.

Twelve cadaver feet were used for a radiographic assessment of the talonavicular joint. A 4.0- or a 6.5-mm screw was inserted through the posterior tubercle of the talus, directed anteriorly into four quadrants of the talar head. Lateral, dorsoplantar, lateral oblique, and medial oblique radiographic views were obtained for each specimen, to assess the position of the screw tip in relation to the talonavicular joint. The lateral view consistently demonstrated the screw tip violation when the screw was directed through the center of the talar head, but it failed when screws were passed into the medial or lateral quadrants of the talar head. The dorsoplantar view consistently demonstrated a screw tip violation of the superior two quadrants of the talar head when other views failed. Each screw tip violation of the inferior quadrants (medial and lateral) required a different view. A screw tip violation of the inferior medial quadrant required the lateral oblique view, whereas the inferior lateral quadrant required the medial oblique view for full appreciation. Here again, other views failed to demonstrate minor screw tip violations consistently. Using these views to assess screw placement could decrease the risk of developing posttraumatic arthritis caused by screw tip violation of the talonavicular joint.

Bone Screws↗

PubMed1998

Quantitative anatomy of the transverse foramen and pedicle of the axis.

Forty dry C2 cervical vertebrae were obtained to evaluate quantitatively the anatomy of the C2 transverse foramen and pedicle. Computed tomography (CT) scans and plain radiographs were also obtained of 20 specimens to evaluate the internal structure of the transverse foramen and pedicle. The results of the measurements showed that differences between male and female specimens were found to be significant for four of seven linear parameters and for one of the two angular parameters. With regard to the sides, differences were found to be significant for two of the seven linear parameters and both of the angular parameters between right and left measurements. The variation of the foramen size between sexes was more significant than that between sides, and a remarkable variation between sides and between sexes was found in the transverse foramen horizontal angle and the pedicle width. The inferior pedicle width was approximately 3 mm less than the superior pedicle width. CT scans revealed that the lateral wall of the pedicle is very thin compared with the medial wall. Considering the greater variation of the C2 foramen orientation, smaller inferior pedicle dimension, and thinner lateral pedicle wall, a screw placement as close as possible to the mediosuperior cortex is recommended to avoid violation of the transverse foramen if transpedicular screw fixation in C2 is intended.

Adult↗

PubMed1981