Pulley reconstruction with different materials: experimental study
Melike Oruç1, M Gürhan Ulusoy, Yüksel Kankaya
11st Plastic and Reconstructive Surgery Clinic, Ankara Training and Research Hospital, Ankara, Turkey. droruc@yahoo.com
Annals of Plastic Surgery
|July 25, 2008
Summary
Researchers compared four materials for digital fibroosseous pulley reconstruction in rabbits. Acellular dermal matrix and bovine pericardium showed potential as effective pulley substitutes for flexor tendon function.
Area of Science:
- Orthopedic surgery
- Biomaterials science
- Hand surgery
Background:
- The digital fibroosseous pulley system is crucial for flexor tendon function and hand mobility.
- Reconstruction of the A2 pulley is vital for maintaining hand function.
- The ideal material for pulley reconstruction remains a subject of debate.
Purpose of the Study:
- To evaluate and compare the efficacy of different materials for digital pulley reconstruction.
- To assess the biomechanical performance of reconstructed pulleys in a rabbit model.
Main Methods:
- Excision of the A2 pulley in rabbits.
- Reconstruction using acellular dermal matrix, solvent dehydrated bovine pericardium, fascia lata, and free tendon graft.
- Biomechanical testing at 8 and 12 weeks, measuring tendon excursion and work of flexion.
Main Results:
- All reconstructed pulleys demonstrated successful function.
- No statistically significant differences were observed between the experimental groups.
- Acellular dermal matrix and solvent-dehydrated bovine pericardium showed promise as effective substitutes.
Conclusions:
- Acellular dermal matrix and solvent-dehydrated bovine pericardium are viable options for digital pulley reconstruction.
- Further research may validate these materials for clinical application in hand surgery.
Related Concept Videos
01:24Frames: Problem Solving I
Consider a jib crane with an external load suspended from the pulley. The dimensions of the crane members are shown in the figure. A systematic analysis of the frame structure is required to determine the reaction forces at the pin joints, assuming that the pulleys are frictionless.
01:20Plastic Deformation in Circular Shafts
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
01:11Bending of Members Made of Several Materials
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
01:24Circular Shafts - Elastoplastic Materials
The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
As torque on the...
As torque on the...
01:20Normal Strain under Axial Loading
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
01:10Residual Stresses in Circular Shafts
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the shaft's...