Bone Apposition of the Acetabular Rim in Deep Hips

2011 ◽  
Vol 93 (Suppl 2) ◽  
pp. 10-16 ◽  
Author(s):  
Kristoff Corten ◽  
Reinhold Ganz ◽  
Etsuo Chosa ◽  
Michael Leunig
Keyword(s):  
Bone Apposition ◽  
Acetabular Rim

Combined Bone Ingrowth and Remodeling Around Uncemented Acetabular Component: A Multiscale Mechanobiology-Based Finite Element Analysis

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Kaushik Mukherjee ◽  
Sanjay Gupta
Keyword(s):  
Finite Element ◽  
Bone Remodeling ◽  
Acetabular Component ◽  
Bone Ingrowth ◽  
Relative Displacement ◽  
Bone Adaptation ◽  
Fe Model ◽  
Bone Apposition ◽  
Element Analysis ◽  
Acetabular Rim

Bone ingrowth and remodeling are two different evolutionary processes which might occur simultaneously. Both these processes are influenced by local mechanical stimulus. However, a combined study on bone ingrowth and remodeling has rarely been performed. This study is aimed at understanding the relationship between bone ingrowth and adaptation and their combined influence on fixation of the acetabular component. Based on three-dimensional (3D) macroscale finite element (FE) model of implanted pelvis and microscale FE model of implant–bone interface, a multiscale framework has been developed. The numerical prediction of peri-acetabular bone adaptation was based on a strain-energy density-based formulation. Bone ingrowth in the microscale models was simulated using the mechanoregulatory algorithm. An increase in bone strains near the acetabular rim was observed in the implanted pelvis model, whereas the central part of the acetabulum was observed to be stress shielded. Consequently, progressive bone apposition near the acetabular rim and resorption near the central region were observed. Bone remodeling caused a gradual increase in the implant–bone relative displacements. Evolutionary bone ingrowth was observed around the entire acetabular component. Poor bone ingrowth of 3–5% was predicted around the centro-inferio and inferio-posterio-superio-peripheral regions owing to higher implant–bone relative displacements, whereas the anterio-inferior and centro-superior regions exhibited improved bone ingrowth of 35–55% due to moderate implant–bone relative displacement. For an uncemented acetabular CoCrMo component, bone ingrowth had hardly any effect on bone remodeling; however, bone remodeling had considerable influence on bone ingrowth.

Achilles Tenorrhaphy in Five Dogs: A Modified Surgical Technique and Evaluation of a Cranial Half Cast

1998 ◽  
Vol 11 (04) ◽  
pp. 205-210 ◽  
Author(s):  
H. Burbidge ◽  
E. Firth ◽  
S. Fox ◽  
S. Guerin
Keyword(s):  
Soft Tissue ◽  
Surgical Technique ◽  
Surgical Procedure ◽  
Normal Function ◽  
Surgical Reconstruction ◽  
Bone Apposition ◽  
Cast Material ◽  
Bilateral Lesions ◽  
Bone Tunnels

SummaryAchilles mechanism rupture in four of five dogs was treated with tenorrhaphy using a modified surgical technique designed to optimise accurate apposition of tendon to bone. Two bone tunnels were drilled in the calcaneal tuber from a plantomedial - dorsolateral, and plantolateral – dorsomedial direction respectively. The distal ends of the tendons were sutured to the calcaneal tuber using a Krachow suture pattern. The remaining dog had a mid-tendon Achilles mechanism rupture. A resinous half cast was placed on the cranial aspect of the tarsocrural joint of all five dogs, for a minimum of six weeks, in order to provide limited post operative support. Du e to insufficient cast material two of the support splints failed and one of these cases also required a second surgical procedure. A varying amount of soft tissue irritation was noted in each case. All of the five Achilles mechanisms healed, and all of the dogs returned to normal function.Five dogs with surgical reconstruction of the Achilles mechanism were stabilised postoperatively with a resinous half cast placed on the cranial aspect of the tarsocrural joint for a minimum of six weeks. Two of these casts failed at the tarsocrural joint when six folds of casting material were used; all subsequent cases had eight folds applied. Variable soft tissue irration was observed under the cast in each case. A modified surgical technique using a Krachow suture pattern allowed good tendon-bone apposition. All five Achilles mechanisms healed, and all dogs returned to normal function. Bilateral lesions were identified in 3 of the 4 dogs examined.

In vivo Evaluation of a Collagen Scaffold Preconditioned with Adipose-derived Mesenchymal Stem Cells Used for Bone Regeneration A histological study

2018 ◽  
Vol 55 (4) ◽  
pp. 691-695
Author(s):  
Tudor Sorin Pop ◽  
Anca Maria Pop ◽  
Alina Dia Trambitas Miron ◽  
Klara Brinzaniuc ◽  
Simona Gurzu ◽  
...  
Keyword(s):  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Bone Regeneration ◽  
Histological Study ◽  
Collagen Scaffold ◽  
Bone Defects ◽  
Collagen Scaffolds ◽  
In Vivo Evaluation ◽  
Calvarial Bone ◽  
Bone Apposition

The use of collagen scaffolds and stem cells for obtaining a tissue-engineering complex has been an important concept in promoting repair and regeneration of the bone tissue. Such units represent important steps in the development of an ideal scaffold-cell complex that would sustain new bone apposition. The aim of our study was to perform a histologic evaluation of the healing of critical-sized bone defects, using a biologic collagen scaffold with adipose-derived mesenchymal stem cells, in comparison to negative controls created in the adjacent bone. We used 16 Wistar rats and according to the study design 2 calvarial bone defects were created in each animal, one was filled with collagen seeded with adipose-derived stem cells and the other one was considered negative control. During the following month, at weekly intervals, the animals were euthanized and the specimens from bone defects were histologically evaluated. The results showed that these scaffolds were highly biocompatible as only moderate inflammation no rejection reactions were observed. Furthermore, the first signs of osseous healing appeared after two weeks accompanied by angiogenesis. Collagen scaffolds seeded with adipose-derived mesenchymal stem cells can be considered a promising treatment option in bone regeneration of large defects.

scholarly journals The Direct 3D Printing of Functional PEEK/Hydroxyapatite Composites via a Fused Filament Fabrication Approach

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 545
Author(s):  
Krzysztof Rodzeń ◽  
Preetam K. Sharma ◽  
Alistair McIlhagger ◽  
Mozaffar Mokhtari ◽  
Foram Dave ◽  
...  
Keyword(s):  
Tensile Strength ◽  
3D Printing ◽  
Selective Laser Sintering ◽  
Fused Filament Fabrication ◽  
Bone Apposition ◽  
Innovative Solutions ◽  
3D Printed ◽  
Work Samples ◽  
Viable Approach ◽  
Crystalline Domains

The manufacture of polyetheretherketone/hydroxyapatite (PEEK/HA) composites is seen as a viable approach to help enhance direct bone apposition in orthopaedic implants. A range of methods have been used to produce composites, including Selective Laser Sintering and injection moulding. Such techniques have drawbacks and lack flexibility to manufacture complex, custom-designed implants. 3D printing gets around many of the restraints and provides new opportunities for innovative solutions that are structurally suited to meet the needs of the patient. This work reports the direct 3D printing of extruded PEEK/HA composite filaments via a Fused Filament Fabrication (FFF) approach. In this work samples are 3D printed by a custom modified commercial printer Ultimaker 2+ (UM2+). SEM-EDX and µCT analyses show that HA particles are evenly distributed throughout the bulk and across the surface of the native 3D printed samples, with XRD highlighting up to 50% crystallinity and crystalline domains clearly observed in SEM and HR-TEM analyses. This highlights the favourable temperature conditions during 3D printing. The yield stress and ultimate tensile strength obtained for all the samples are comparable to human femoral cortical bone. The results show how FFF 3D printing of PEEK/HA composites up to 30 wt% HA can be achieved.

Morphometric assessment of hip dysplasia in a cat treated by juvenile pubic symphysiodesis

2016 ◽  
Vol 29 (05) ◽  
pp. 433-438
Author(s):  
John Culvenor ◽  
Craig Bailey ◽  
Alen Lai
Keyword(s):  
Computed Tomography ◽  
Case Report ◽  
Hip Dysplasia ◽  
Simple Procedure ◽  
Promising Treatment ◽  
Design Case ◽  
Sector Angle ◽  
Morphometric Assessment ◽  
Acetabular Rim

SummaryObjective: To quantitatively evaluate the change of the coxofemoral joints using computed tomography and distraction index in a cat with hip dysplasia treated by juvenile pubic symphysiodesis.Study Design: Case report.Animal: Eighteen-week-old female entire Maine Coon cat.Results: Juvenile pubic symphysiodesis resulted in changes in the distraction index, acetabular angle, dorsal acetabular rim angle, dorsal acetabular sector angle, and clinical improvement at the six month follow-up. No intra-operative or postoperative complications were recorded.Conclusions: Juvenile pubic symphysiodesis performed at 18 weeks of age resulted in improvement in hip joint conformation and hip laxity in a dysplastic cat.Clinical relevance: Juvenile pubic symphysiodesis may be a promising treatment for feline hip dysplasia and is a safe and technically simple procedure to perform. Further investigations are warranted.

The Influence of Functional Use of Endosseous Dental Implants on the Tissue-implant Interface. I. Histological Aspects

1979 ◽  
Vol 58 (10) ◽  
pp. 1953-1969 ◽  
Author(s):  
John B. Brunski ◽  
Aquilante F. Moccia ◽  
Solomon R. Pollack ◽  
Edward Korostoff ◽  
Don I. Trachtenberg
Keyword(s):  
Connective Tissue ◽  
Dental Implants ◽  
Fibrous Capsule ◽  
Bone Apposition ◽  
One Year

The tissue-implant interfaces of functional and non-functional endosseous dental implants were compared histologically for up to one year postoperatively. Nonmineralized connective tissue zones (a "fibrous capsule") existed in all functional interfaces. Direct, or nearly direct, bone apposition to implants occurred in non-functional interfaces. The origin of this result and its significance in dental implantology is discussed.

scholarly journals Longitudinal assessment of salivary vitamin D binding protein during orthodontic tooth movement

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Nada Tashkandi ◽  
Yihong Zhao ◽  
Gabrielle Mitchell-Lee ◽  
Danielle Stephens ◽  
Michele Patel ◽  
...  
Keyword(s):  
Vitamin D ◽  
Tooth Movement ◽  
Binding Protein ◽  
Orthodontic Tooth Movement ◽  
Biological Marker ◽  
Quantitative Measure ◽  
Longitudinal Assessment ◽  
Vitamin D Binding Protein ◽  
Bone Apposition ◽  
Strong Trend

Abstract Background Vitamin D is critical for bone physiology. In this study, we quantified Vitamin D Binding Protein (VitDBP) levels in saliva as a measure of Vitamin D during orthodontic tooth movement. Methods In this longitudinal study, saliva samples were collected from 73 orthodontic patients for 4 timepoints for the first six months of orthodontic treatment, along with dental casts at the beginning and the end of the study period. The saliva was measured for VitDBP as a biological marker for bone apposition and clinical tooth movement. We used the absolute change in Little's Irregularity Index as a quantitative measure for alignment. In addition, we measured the levels of alkaline phosphatase (ALP) in saliva as a marker of bone turnover. Results Both low (< 2.75 ng/ml) and high (> 6.48 ng/ml) VitDBP levels were associated with reduced tooth movement. Significant (p < 0.05) seasonal changes in VitDBP using a two-season year model were found with lower levels observed in the summer (Apr–Sept) than in the winter (Oct–Mar). Conclusions Clinically significant orthodontic tooth movement is associated with an optimal range of VitDBP in saliva. Normal levels of VitDBP correlated with more orthodontic tooth movement, suggesting a "normal" range of salivary content of VitDBP. Given the strong trend that is independent of the confounding factors (ex. age, race or gender), the predictive value or salivary VitDBP for tooth movement should be studied in larger cohorts in future studies.

scholarly journals Molar Uprighting: A Considerable and Safe Decision to Avoid Prosthetic Treatment

2017 ◽  
Vol 11 (1) ◽  
pp. 466-475 ◽  
Author(s):  
Taísa Boamorte Raveli ◽  
Dirceu Barnabé Raveli ◽  
Kelei Cristina de Mathias Almeida ◽  
Ary dos Santos Pinto
Keyword(s):  
Orthodontic Treatment ◽  
Tooth Movement ◽  
Orthodontic Tooth Movement ◽  
Female Adult ◽  
Bone Apposition ◽  
Force System ◽  
Second Molar ◽  
Space Closure ◽  
Practical Implications ◽  
Lower Molar

Background: Tipped lower molar over edentulous space is very common in orthodontics practice when adults seek treatment. The segmented arch technique features a predictable force system that provides a controlled release of force that can produce light and continuous tooth movement. Case Description: A female adult patient, who lost a permanent lower first molar, needed correction of the position of her permanent first molar place. Instead of making space for rehabilitation, it was closed after second molar uprighting and a balanced interdigitation was created without prosthetics. The patient was successfully treated with segmented arch technique using root correction spring activated with geometry VI to promote uprighting of a tipped molar and Niti spring coil to promote space closure. Practical Implications: Segmented arch technique is known to provide predictable light and continuous forces, which is very much indicated in adult treatment. There are several things to consider when orthodontically treating adult patients. Their periodontal conditions might not be ideal, less bone apposition may occur, and side effects of orthodontic tooth movement are expected. Thus, a predictable and controlled orthodontic treatment is needed.

A method for visualizing the dorsal acetabular rim and the coverage of the femoral head

2001 ◽  
Vol 14 (03) ◽  
pp. 151-155 ◽  
Author(s):  
J. Hoskinson ◽  
W. C. Renberg
Keyword(s):  
Femoral Head ◽  
Hip Joint ◽  
Prognostic Value ◽  
Degenerative Change ◽  
Femoral Shaft ◽  
Normal Activity ◽  
Degenerative Joint Disease ◽  
Joint Disease ◽  
Anatomical Landmarks ◽  
Acetabular Rim

SummaryThe authors describe a new technique to visualize the dorsal acetabular rim and the coverage of the femoral head in the nonsedated dog. The technique involves using an overhead beam, directed at an angle tangential to the dorsal rim of the acetabulum, with a film positioned caudal to the standing dog. Anatomical landmarks that can routinely be identified include: the ilial crest, ilial shaft, ischial tuberosity, acetabulum, acetabular rim (particularly the dorsocaudal component), femoral head, greater trochanter, femoral neck, femoral shaft, rectum and the tail. Because the animal is standing and is not sedated, the technique may have additional value as a means of evaluating subluxation of the hip joint. It maintains a posture as close as possible to that experienced by the animal in normal activity. If the technique has prognostic value in that regard, more investigation is needed, but it is useful in itself as a technique to visualize the area of the acetabulum.A new radiographic technique to evaluate the canine hip joint is described. The view involves tangential projection of the acetabulum in the standing, awake dog. Nineteen dogs have been radiographed to develop the technique and the method has been found to be technically simple and consistent. It allows examination of the dorsal acetabular rim and may help examine the amount of subluxation of the hip as well as the presence of any degenerative joint disease. The authors advocate additional study to determine the technique’s prognostic value in predicting degenerative change associated with hip dysplasia.

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