Detailed explanation of the whole process of making the calf prosthesis receiving cavity
You may also have this question
"Why did it take so long to get my prosthesis? "
"How is the socket made?"
The socket is the only part of the prosthesis that is in direct contact with the human body. Its quality directly determines whether you are comfortable wearing it and whether your gait is natural. A qualified socket requires hours of meticulous production by prosthetists and orthotists. This article takes you through the entire process of calf prosthetic sockets from scratch to finished product.
Step One: Residual LimbAssessment and Measurement
< span>Before hands-on production, the prosthetist-orthotist will conduct a comprehensive assessment of the residual limb:
·The shape of the residual limb: cylindrical, conical or bulbous? Different shapes determine the way the socket is accommodated
· Residual limb length: the longer, the better the lever arm and the more precise the control of the prosthesis
·Skin condition: whether there are scars, skin allergies, breaks or chronic ulcers
·Residual limb circumference: Use a soft tape to measure the circumference at different sections and record the data
At the same time, assess the overall condition: length of the healthy leg, pelvic height, walking habits, etc., to ensure left and right symmetry after the prosthesis is assembled.
The second step: plaster taking
This is the most critical step in making the socket, the purpose is to obtain the accurate three-dimensional shape of the residual limb.
Traditional method: wet plaster bandage method
< span>1.Put protective socks on the residual limb and mark the bony prominence line
2.Wrap the soaked plaster bandage around the residual limb and apply appropriate shaping pressure
4. Injection Gypsum slurry to obtain a positive cast of the residual limb
Modern method: 3DScanning method
Use a handheld three-dimensional scanner to scan the residual limb< /span>360°Scan to obtain an accurate digital model, eliminating the need for plastering steps. The accuracy is higher, and the data can be saved permanently. There is no need to re-take the shape when replacing the socket.
Step Three: Positive Model Trimming
After obtaining the residual limb positive model, the prosthetist and orthotist need to perform fine trimming on the plaster model:
·Apophyseal decompression: Add plaster to the tibial crest, fibula capitellum and other locations to create a decompression space to prevent pressure pain on the apophysis after wearing it< /p>
·Soft tissue area compression: Appropriate reduction in thick muscle areas to create contact pressure and help suspension fixation
·Contour optimization: Make the socket shape more in line with biomechanical requirements and evenly distribute body weight
This step requires extremely high experience. For the same plaster male model, the trimming results of different orthopedists may lead to completely different wearing experiences.
Step 4: Thermoplastic Forming
Test socket (transparent MingPPMaterial):
1.Put polypropylene (PP ) The plate is heated to the softening temperature (approximately 160-180°C)
2.Wrap the softened plastic plate tightly against the male mold while it is hot, and vacuum to form it span>
3.Trim the edges after cooling to obtain a transparent test cavity
The role of the transparent socket: after wearing it, you can directly observe the stress on the skin, find problems and modify them, and then make the final carbon fiber or reinforced socket after trying it on to confirm the fit.
Formal socket (carbon fiber or reinforced plastic):
The process is similar to the test cavity, but carbon fiber cloth is used+Resin vacuum lamination, or stronger and more durable materials such as high-density polyethylene (HDPE), the thickness and strength are greatly increased.
Step 5: Alignment and assembly
After the socket is made, it needs to be connected with the prosthetic foot and connecting tube Assemble the components and perform precise force line alignment:
·Sagittal alignment: Viewed from the side, whether the force line of the prosthesis passes through a reasonable position
·Coronal plane line: Viewed from the front, whether the left and right sides are balanced and symmetrical
· Rotational alignment: Whether the direction of the prosthetic foot is consistent with that of the healthy side
Alignment is a dynamic adjustment process that requires amputees to walk with the prosthesis, and the orthotist makes repeated adjustments by observing the gait.
Step 6: Try on and adjust
< span>The socket is not done once and for all. It requires multiple follow-up visits and adjustments in the early stage:
· The 1 follow-up visit (about 1
·The 2-3 second follow-up visit (2-4weeks): Continue to adjust to comfortable wearing and stable gait
·Long-term Follow-up: The shape of the residual limb will change with weight, activity level, and seasonal changes. It is recommended to review every 6-12 months
FAQ
Q: How often does the socket need to be replaced?
A: Generally used 2-3 years, the residual limb will obviously shrink and become thinner, and the socket will become loose or damaged and needs to be replaced.
Q: Can the socket be waterproof?
A: Depending on the material, carbon fiber and HDPEThe socket can be exposed to water, but the connecting components need to be individually confirmed for waterproof performance.
Q: Can I buy a universal socket online?
A: Definitely not recommended. The socket must be customized, and universal products cannot accurately match the residual limb, which can cause skin damage and gait abnormalities, posing great safety risks.
Summary
1. Socket making is a highly personalized precision process, which takes 2-4weeks< /p>
2.Precise processing of condyle decompression and soft tissue compression is the key to comfortable wearing
3.Multiple follow-up visits and adjustments in the early stage are normal and necessary. Don’t give up because of the trouble
Further reading: What is phantom limb pain? /How long does prosthetic gait training take? /K-level assessment?
The content of this article is for popular science reference only. Please consult a certified prosthetist and orthotist for specific adaptation plans.
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