patellar tendon bearing prosthesis
TRANSCRIPT
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PATELLAR TENDON BEARING PROSTHESIS
Dr. Madhusudhan NC
Resident-Dept. of Orthopaedic Surgery
Bangalore Baptist Hospital
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History
• Invented in 1950’s (Even before we all were born)
• James Foort & Charles Radcliffe
• State of the art was the “plug fit” socket
Plug Fit
• Typically wood socket lined with leather
• Essentially a cylinder
• No provision for volume change
• Depth of limb engaged in socket was volume
dependent
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PRESCRIPTION CRITERIA
1. A wide variety of amputees can wear.
2. To know who are not the candidates for PTB prosthesis……. We need to know the contraindications for PTB prosthesis.
3. Successful application described under 3 criterias.
1. Control.
2. Weight bearing.
3. Acceptance.
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Co
ntr
ol…
….
1. Amount of stump available for leverage.
2. Condition of the stump musculature.
3.Neuromuscular function.
Wei
ght
bea
rin
g A
bili
ty…
.. 1. Strength of bone.
2. Joint function.
3. Presence or absence of pain.
4. Condition of skin in weight bearing areas.
5. Vascular state.
Acc
epta
nce
…. 1. Amputee’s
motivation.
2. His activity level.
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PTB-Loading Pressure Tolerant Areas
• It was theorized that certain places on the residual
limb would be better at pressure dissipation and thus
• Could tolerate load better than other areas
• These were areas that contained
– Soft tissue
– Neurovascular areas
– Muscular areas
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PTB-Loading Pressure Tolerant Areas
• Patella Tendon
• Anterior Muscular Compartment
• Medial Tibial Flare
• Lateral Stabilizing bar/ Shaft of Fibula
• Gastrocnemius muscle bellies
• Popliteal Fossa
• Distal end to some extent
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PTB-Relieving Pressure Sensitive Areas
• If soft tissue and vascular areas can tolerate load, then
remaining areas must be less tolerant of load.
• This includes areas of
– Less vasculature
– Less soft tissue
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PTB-Relieving Pressure Sensitive Areas
• Patella
• Lateral Tibial (Gerdy’s)Tubercle/Iliotibial Band
• Fibula Head/Common Peroneal Nerve
• Tibial Tubercle
• Tibial Crest
• Distal cut end of Fibula/Tibia
• Hamstring Tendons
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We’ll discuss in brief how exactly it has been done.
Concepts:
1. Parts.
2. Shank?
3. Foot Assembly
4. Alignments.
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So we have socket ready with us…,
Let us select the Foot assembly.
Options!
1. SACH foot.
2. SAFE (Stationary Attachment Flexible Endoskeleton) foot.
3. STEN (Stored Energy)
4. Carbon copy.
5. Quantum foot.
6. Seattle….,Flex foot….,Springlite…..,Jaipur foot.
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One End we have Socket….,the other end Foot…
Connected by. “Shank”
Shank
1. Exoskeleton.
2. Endoskeleton.
* Strength
* Cost
* Cosmesis
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Needs Suspension.
Options:
1. Mulleys strap/ Condylar cuff suspension.
2. PTBSCSP
3. Sleeve suspension.
4. Silicone suction socket.
5. Thigh corset.
6. Waist bell.
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To remember…
1. Parts.
2. Weight bearing and relieving.
3. Types of foot assembly, shank,suspension.
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THANK YOU