The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
John Y Kwon - One of the best experts on this subject based on the ideXlab platform.
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The Anteromedial Cortex of the Calcaneus: A Cadaveric Study
Foot & Ankle Orthopaedics, 2019Co-Authors: Jorge Briceno, Bruno Moura, Brian Velasco, Dayton Mcmillan, John Y KwonAbstract:Category: Hindfoot Introduction/Purpose: The irregular morphology of the calcaneus obstructs its clear visualization on radiographic imaging. Particularly challenging is identifying the medial cortex given its concavity and bony overlap of the calcaneal body. Iatrogenic screw penetration of the medial wall of the calcaneus comes with increased risk of injuring the neurovascular bundle and the flexor hallucis longus tendon. Despite all intraoperative precautions, it is not infrequent to see misplaced screws in postoperative imaging. The objective of the present study is to evaluate the normal proportion of the calcaneus width to radiographically define the extent of the medial cortex on axial fluoroscopic imaging. Methods: Eight left sided fresh-frozen below-the-knee amputated cadaveric specimens were utilized for this study. Each specimen was dissected on the medial side of the hindfoot to allow visualization of the medial cortex of the calcaneus. A partial cuboid ostectomy was performed to visualize the calcaneocuboid joint and to install radiopaque markers on the borders of the anterior calcaneal facet. Finally, Harris axial views were obtained. Two independent observers measured the widths of the calcaneus on digital fluoroscopic Harris views at two levels: the maximal width at the Sustentaculum tali and the maximal width at the anterior process. A ratio was calculated between these measurements. Results: The ratio between the maximal width at the anterior process and the Sustentaculum ranged between 0.42 and 0.52 with an average ratio of 0.47 +/- 0.04. Conclusion: Calcaneal screw misplacement, particularly from lateral to medial, can lead to damage of the neurovascular bundle and the flexor hallucis long tendon ultimately affecting clinical outcomes. The measurements in the present study suggest a lower risk of violating the medial cortex when the length of the screw placed in the anterior process of the calcaneus is less than half of the maximal width of the calcaneus at the Sustentaculum tali. As the medial cortex is difficult to visualize on intraoperative fluoroscopy, the clinical use of this normal ratio in axial views could help surgeons to avoid calcaneal screw misplacement.
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anatomic alignment and integrity of the Sustentaculum tali in intra articular calcaneal fractures is the Sustentaculum tali truly constant
Journal of Bone and Joint Surgery American Volume, 2014Co-Authors: Ida Leah Gitajn, Mostafa M Abousayed, Rull James Toussaint, Beverlie L Ting, John Y KwonAbstract:Background:In an intra-articular calcaneal fracture, the Sustentaculum tali is generally thought to remain tightly bound to the talus by the interosseous talocalcaneal ligaments, spring ligament, and deltoid ligament, providing a “constant” fragment that remains anatomically aligned. The extensile l
F Drayerverhagen - One of the best experts on this subject based on the ideXlab platform.
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arthritis of the subtalar joint associated with Sustentaculum tali facet configuration
Journal of Anatomy, 1993Co-Authors: F DrayerverhagenAbstract:Abstract The articular facets of the Sustentaculum tali have a variety of configurations that are generally viewed as nonmetric traits of little functional significance. Bruckner (1987), in contrast, has hypothesised that Sustentaculum tali facet variations are functionally important because they influence subtalar joint stability. To test this hypothesis, 191 calcanei were analysed for correlations between Sustentaculum tali facet morphology and osteoarthritis of the subtalar joint. Calcanei with 2 separate Sustentaculum tali facets had a lower frequency of arthritic changes associated with joint instability than calcanei with other facet configurations. This finding supports Bruckner's hypothesis that subtalar joint facet configuration is a factor in foot mobility.
N Y Kamdi - One of the best experts on this subject based on the ideXlab platform.
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arthritis of the subtalar joint associated with Sustentaculum tali facet configuration
International Journal of Approximate Reasoning, 2014Co-Authors: K S Nemade, A P Kasote, N Y KamdiAbstract:Variation in the articular facet of the sustenticulum tali have been described by many authors. Most researchers view these differences in facet configuration as anatomical variations of no functional significance. Bruckner (1987), for the first time argued that these facet configurations affect joint stability. The purpose of this study was to determine the talar facet configuration of calcanei in India, measure the angle between the anterior and middle facet planes of these calcanei, and assess the relation between the above parameters and the degenerative changes in the subtalar joints. Study was conducted in 220 calcanei of unknown age & sex. The facet patterns observed were fused anterior and middle facets (Type I), three separate facets (Type II), absence of the anterior facet (Type III) and three merged facets (Type IV). Osteoarthritic changes studied are lipping, eburnation on visual inspection and subchondral sclerosis on radiographs. Present study reveals that the talar facet configuration of calcanei and the angle between the anterior and middle facets influence the stability of the subtalar joints and development of osteoarthritis.
A M Alpaslan - One of the best experts on this subject based on the ideXlab platform.
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osteochondroma of the Sustentaculum tali producing tarsal tunnel syndrome
Foot and Ankle Surgery, 2002Co-Authors: Ali Oznur, A M AlpaslanAbstract:Summary A 37-year-old man presented with tarsal tunnel syndrome. Osteochondroma of the Sustentaculum tali and talocalcaneal coalition were detected on computed tomography (CT) and three dimensional CT. He was pain-free 4 weeks after excision of the osteochondroma. The patient has remained asymptomatic for 3 years postoperatively.
Ali Oznur - One of the best experts on this subject based on the ideXlab platform.
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osteochondroma of the Sustentaculum tali producing tarsal tunnel syndrome
Foot and Ankle Surgery, 2002Co-Authors: Ali Oznur, A M AlpaslanAbstract:Summary A 37-year-old man presented with tarsal tunnel syndrome. Osteochondroma of the Sustentaculum tali and talocalcaneal coalition were detected on computed tomography (CT) and three dimensional CT. He was pain-free 4 weeks after excision of the osteochondroma. The patient has remained asymptomatic for 3 years postoperatively.
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case report osteochondroma of the tarsal tunnel syndrome Sustentaculum tali producing
2002Co-Authors: Ali OznurAbstract:Summary A 37-year-old man presented with tarsal tunnel syndrome. Osteochondroma of the Sustentaculum tali and talocalcaneal coalition were detected on computed tomography (CT) and three dimensional CT. He was pain-free 4 weeks after excision of the osteochondroma. The patient has remained asymptomatic for 3 years postoperatively.
