Comparison of Interface Stresses and Strains for Onlay and Inlay Unicompartmental Tibial Components

2011 ◽  
Author(s):  
Peter S. Walker ◽  
Dhiraj S. Parakh ◽  
Miriam E. Chaudhary ◽  
Chih-Shing Wei
Keyword(s):  
Cancellous Bone ◽  
Outer Edge ◽  
Plastic Component ◽  
Bone Removal ◽  
Metal Backing

There are two main designs used for unicompartmental tibial components. The first design, an all plastic component called an inlay, preserves bone on the outer edge of the tibia which is feasible using a robotically-controlled burring tool. Also, the depth of resection is small, preserving the strongest cancellous bone which is near the surface. The second design, called an onlay, resects the entire condyle and includes a metal backed plate which rests on the resected tibia. This component requires more bone removal but metal-backing has previously been shown to distribute the load more uniformly. The purpose of this study was to investigate the hypothesis that while inlay components require less bone removal, the peak stresses and strains at the surface of the bone will be greater when compared to onlay components.

Quasi-Periodic Oscillations in Dwarf Novae

1979 ◽  
Vol 46 ◽  
pp. 77-88
Author(s):  
Edward L. Robinson
Keyword(s):  
Binary Systems ◽  
Outer Edge ◽  
Light Curves ◽  
Close Binary ◽  
Bright Spot ◽  
Dwarf Novae ◽  
Periodic Oscillations ◽  
High Frequencies ◽  
Short Period ◽  
Typical Time

Three distinct kinds of rapid variations have been detected in the light curves of dwarf novae: rapid flickering, short period coherent oscillations, and quasi-periodic oscillations. The rapid flickering is seen in the light curves of most, if not all, dwarf novae, and is especially apparent during minimum light between eruptions. The flickering has a typical time scale of a few minutes or less and a typical amplitude of about .1 mag. The flickering is completely random and unpredictable; the power spectrum of flickering shows only a slow decrease from low to high frequencies. The observations of U Gem by Warner and Nather (1971) showed conclusively that most of the flickering is produced by variations in the luminosity of the bright spot near the outer edge of the accretion disk around the white dwarf in these close binary systems.

The Repair and Healing of Two Traumatic Ilial Body Fractures Adjacent to Cemented Total Hip Acetabular Components

1992 ◽  
Vol 05 (02) ◽  
pp. 85-89
Author(s):  
P. K. Shires ◽  
T. L. Dew
Keyword(s):  
Internal Fixation ◽  
Cancellous Bone ◽  
Surgical Techniques ◽  
Autogenous Bone ◽  
Cancellous Bone Graft ◽  
Standard Methods ◽  
Intravenous Antibiotics ◽  
Prophylactic Use ◽  
Acetabular Components ◽  
Autogenous Bone Grafts

SummaryThis report has documented the repair and healing of two ilial fractures in dogs which were compounded by the presence of a cemented acetabular prosthesis. While specific recommendations can not be made from such a small number of cases, the information presented herein suggests that such fractures will heal without complication if aseptic surgical techniques and standard methods of internal fixation are employed. The authors strongly recommend the prophylactic use of intravenous antibiotics and the placement of cancellous bone graft when the repair of such fractures is attempted.Two traumatic ilial fractures involving the cement/bone interface of acetabular prostheses were repaired using lag screws, cerclage wires, and autogenous bone grafts. The fractures healed and ambulatory function was regained.

Arthrodesis of the Distal Two Tarsal Joints in the Horse Using Perforated Stainless Steel Cylinders and Cancellous Bone Graft

1991 ◽  
Vol 4 (01) ◽  
pp. 21-27 ◽  
Author(s):  
R. M. Archer ◽  
R. K. Schneider
Keyword(s):  
Stainless Steel ◽  
Bone Graft ◽  
Cancellous Bone ◽  
Cancellous Bone Graft ◽  
The Third ◽  
Partial Fusion

SummaryTwo perforated stainless steel cylinders and autogenous cancellous bone were implanted into each of the distal intertarsal and tarsometatarsal joints of seven horses. In two control horses holes were drilled into each joint and autogenous cancellous bone was implanted without stainless steel cylinders. Horses which had cylinders implanted in the distal tarsal joints exhibited less lameness and were more comfortable following surgery than were the control horses. Fracture of the third tarsal, central tarsal, or third metatarsal occurred in five of the seven horses implanted with stainless steel cylinders within 45 days of surgery. Two implanted horses and two control horses were observed for five months after surgery. Partial fusion of the distal tarsal joints occurred in all four horses. Control horses were more lame than the implanted horses and developed a large bony exostosis over the medial distal tarsus.

Cortico-cancellous bone allografting in treatment of children with orthopedic diseases

2017 ◽  
Author(s):  
Mikhail Mikhovich ◽  
Leanid Hlazkin ◽  
Viktoryja Kazlova
Keyword(s):  
Cancellous Bone ◽  
Orthopedic Diseases

PEID (Percutaneous Endoscopic Interlaminar Discectomy): Cautionary Points Based on the Evidence

2018 ◽  
Vol 1 (2) ◽  
pp. 7
Author(s):  
Jun Ho Lee
Keyword(s):  
Lumbar Disc ◽  
Lumbar Discectomy ◽  
Radiographic Evaluation ◽  
Operative Indication ◽  
Endoscopic Techniques ◽  
Bone Removal ◽  
Iatrogenic Trauma ◽  
Minimal Damage ◽  
Surgical Modality ◽  
Endoscopic Lumbar Discectomy

Background: Percutaneous endoscopic lumbar discectomy (PELD) is one of the most sophisticated operative procedures for the treatment of lumbar disc herniation (LDH). Endoscopic techniques are now becoming standard in many areas due to expanded technical possibilities of full-endoscopic transforaminal or interlaminar resection of herniated lumbar discs as well as stenosis. However conventional percutaneous endoscopic interlaminar discectomy (PEID) disc operations may sometimes result in subsequent untoward complications due to unnoticed iatrogenic trauma to neural structures, which is mostly related to an anatomical limitation during endoscope insertion.Methods: An appropriate operative indication of the PEID without bone removal or laminectomy can be used to treat LDH cases with an enough interlaminar space (at least ≥ 20 mm by bi-facetal distance) from the reported evidences. Otherwise, there might be several indications for requirement of bone removal; a narrow interlaminar space, disappearance of the concave shape of the upper vertebral laminae, high-grade migration of LDH, recurrent LDH, obesity, or an immobile nerve root.Conclusion: The significance of PEID lies also in its minimal damage to surrounding structures such as muscle, bone, and ligaments. A discrete radiographic evaluation from the patient preoperatively is mandatory before choosing a proper endoscopic surgical modality for the sake of optimal clinical outcome after PEID. 

Aumento de coroa estética sem elevação de retalho – abordagem minimamente invasiva

2020 ◽  
Vol 12 (45) ◽  
pp. 34-39
Author(s):  
Flavia Sukekava ◽  
Julia Helena Luiz ◽  
Paloma Palma ◽  
Jaques Luiz
Keyword(s):  
Minimally Invasive ◽  
Correct Diagnosis ◽  
Case Series ◽  
Minimally Invasive Techniques ◽  
Bone Removal ◽  
Use Of Technology ◽  
Treatment Plans ◽  
Invasive Techniques ◽  
Crown Lengthening ◽  
Gummy Smile

Gummy smile is a characteristic in which the patient exposes more than 2 mm of keratinized gingiva in forced smile. With a multifactorial cause, its correct planning depends directly on the correct diagnosis. Usually, the procedures that involve manipulation and the enlargement of the aesthetical crown lengthening are surgical. The objective of this case series was to show the advantages of surgical crown augmentation surgery in aesthetic areas with minimally invasive techniques. Three cases of gummy smile were presented, with different treatment plans and techniques for execution. In the 3 cases, bone removal was performed with piezoelectric ultrasound, which made the postoperative more comfortable for patients. These cases illustrate the use of technology to reduce morbidity in patients who need to undergo bone removal to treat gingival smile.

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