Ashok Biyani

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STUDY DESIGN A histologic, biologic, and immunohistochemical assessment using human samples of the lumbar ligamentum flavum. OBJECTIVE To prove our hypothesis that hypertrophy of the ligamentum flavum is caused by accumulation of inflammation-related scar tissue. SUMMARY OF BACKGROUND DATA Lumbar spinal canal stenosis is 1 of the most common spinal(More)
STUDY DESIGN Finite element model of L3-S1 segment and confirmatory cadaveric testing were used to investigate the biomechanical effects of a mobile core type artificial disc (Charité artificial disc; DePuy Spine, Raynham, MA) on the lumbar spine. OBJECTIVE To determine the effects of the Charité artificial disc across the implanted and adjacent segments.(More)
Associated fractures of the distal ulnar metaphysis were present in 19 of 320 distal radial fractures requiring either closed manipulation or surgical treatment over a 2-year period. Four morphological patterns of ulnar fracture were encountered, the commonest being the type 1 simple extra-articular fracture of the distal end of ulna with minimal(More)
STUDY DESIGN A multidisciplinary study involving clinical, histologic, biomechanical, biologic, and immunohistologic approaches. OBJECTIVE.: To clarify the pathomechanism of hypertrophy of the ligamentum flavum. SUMMARY OF BACKGROUND DATA The most common spinal disorder in elderly patients is lumbar spinal canal stenosis, causing low back and leg pain,(More)
The need for increased awareness and a high index of suspicion for post traumatic syringomyelia is emphasised. Early clinical diagnosis confirmed by MRI and early treatment can avert or minimise the potentially devastating effects of post traumatic syringomyelia. The regular and frequent follow up of the patient on a yearly or alternate year basis to(More)
STUDY DESIGN To determine the effect of cage/spacer stiffness on the stresses in the bone graft and cage subsidence. OBJECTIVE To investigate the effect of cage stiffness on the biomechanics of the fused segment in the lumbar region using finite element analysis. SUMMARY OF BACKGROUND DATA There are a wide variety of cage/spacer designs available for(More)
BACKGROUND CONTEXT Biomechanical studies of artificial discs that quantify parameters such as load sharing and stresses have been reported in literature for single-level disc placements. However, literature on the effects of using the Charité artificial disc (ChD) at two levels (2LChD) as compared with one-level fusion (using a cage [CG] and a pedicle screw(More)
The charts and radiographs of 48 surgically treated patients who underwent surgery for calcaneal fractures (right in 25 patients, left in 22, and bilateral in 1) between 1987 and 1994 were retrospectively reviewed. Coronal computed tomographic scans alone were obtained in 33 patients, and both coronal and axial computed tomographic scans were obtained in 9(More)
We retrospectively reviewed 32 elderly patients (mean age 71.7 years, range 66-83 years) with displaced tibial plateau fractures after a mean of 3.7 years (range 1-7 years) after operative treatment. Schatzker type 2 fracture was the commonest pattern of fracture (60.3 per cent). According to the modified Rasmussen clinical and radiographic criteria, there(More)
A non-linear 3-dimensional finite element pediatric lumbar spine model with vertebral growth plate and apophyseal bony ring was developed. Lumbar spondylolysis was simulated in the model. The Von Mises stresses in the structures surrounding the vertebral growth plate, including apophyseal bony ring and osseous endplate were calculated in various loading(More)