Prosthetics and Orthotics Practice Questions

Q: What is the recommended distance from the olecranon for amputation?

15-20 cm. **Explanation:** In upper limb amputations, the primary goal is to preserve as much functional length as possible while ensuring adequate soft tissue coverage for a prosthetic interface. For a **Below-Elbow (Trans-radial) Amputation**, the ideal level is at the junction of the middle and distal thirds of the forearm. **Why 15-20 cm is correct:** The standard recommendation for an ideal stump length is **15 to 20 cm (approximately 7-8 inches)** measured from the tip of the olecranon. This length is considered "ideal" because: 1. It provides a long enough lever arm for efficient prosthetic control. 2. It preserves the pronation and supination movements of the forearm. 3. It allows sufficient space for the installation of modern prosthetic wrist units and components. **Analysis of Incorrect Options:** * **A (5-10 cm):** This is considered a "short" below-elbow stump. While a minimum of 5 cm of intact ulna is required to maintain elbow flexion, such a short stump offers poor leverage and often requires specialized "split-socket" prostheses. * **B (10-25 cm) & D (20-30 cm):** These ranges are either too broad or too long. Amputations in the distal-most part of the forearm (near the wrist) are generally avoided because the skin is thin, poorly vascularized, and lacks the muscle bulk needed to cushion a prosthesis comfortably. **High-Yield Clinical Pearls for NEET-PG:** * **Minimum Length:** At least **5 cm** of the ulna is necessary to preserve elbow function. * **Krukenberg Procedure:** A surgical technique where the radius and ulna are separated to create a "pincer" (sensate) grip; it is specifically indicated for **bilateral blind amputees**. * **Above-Elbow (Trans-humeral) Amputation:** The ideal length is **20 cm** from the acromion process. * **Rule of Thumb:** In all amputations, "Save every possible centimeter of length," but avoid the distal 1/3rd of the forearm due to poor circulation and padding.

Q: The shown apparatus is used for

Patella tendon bearing brace. ***Patella tendon bearing brace*** - This orthotic device is designed to **transfer weight-bearing load through the patella tendon**, reducing stress on the lower extremity during ambulation. - It features a **molded cuff** that fits snugly below the patella and distributes weight through the **patellar tendon bearing area**, commonly used in **prosthetic applications** and **below-knee amputees**. *Ankle knee stabilizer* - This device provides **combined support to both ankle and knee joints** simultaneously, typically used for **multi-joint injuries** or instability. - It features **dual bracing systems** with straps and supports extending from ankle to knee, unlike the focused patellar tendon bearing design. *Thomas splint* - A **rigid metal-framed splint** used primarily for **femur fracture stabilization** and maintaining **skeletal traction** in emergency situations. - It consists of a **ring that fits around the upper thigh** with extending metal bars, designed for **fracture immobilization** rather than weight distribution. *Knee brace* - A general **knee joint support device** used for **ligament injuries**, **post-surgical recovery**, or **osteoarthritis management**. - Available in various forms (**sleeve, hinged, or wraparound designs**) but lacks the specific **weight-bearing transfer mechanism** of a patella tendon bearing brace.

Q: All the following are advantages of the Jaipur foot over the conventional prosthetic foot except

Jaipur foot is electrically operated. Jaipur foot is electrically operated - The Jaipur foot is a **passive prosthetic device** that relies on mechanical design and material properties for function, not electrical power. - Its advantages stem from its **biomechanical design** and **material composition**, allowing for natural movement and cultural suitability. *Appearance of the Jaipur foot is that of normal foot* - This is an **advantage** of the Jaipur foot, as its cosmetic design closely mimics a natural foot, enhancing body image and social acceptance. - Its **cosmetic cover** and lifelike appearance help amputees integrate into daily life without obvious visual differences. *It is suitable for bare foot walking* - This is a significant **advantage** in regions where barefoot walking is common, as its design is robust enough to withstand uneven terrain and provides good traction. - The materials used make it **durable** and adaptable to diverse walking conditions, including unpaved surfaces. *Allows movement at fore foot and midfoot* - This feature is an **advantage** as it provides great flexibility and natural gait pattern, allowing for activities like squatting, sitting cross-legged, and walking on uneven surfaces. - The multi-axial movement at the **ankle and subtalar joint** mimics the natural foot's adaptability, improving stability and comfort.

Q: In below-elbow amputation the length of stump should be

15 - 20 cm. ***15 - 20 cm*** - For a **below-elbow amputation** to be functional, the **stump length** should be approximately **15 to 20 cm** from the olecranon to allow for optimal prosthetic fitting and control. - This length provides sufficient leverage and preserves enough forearm musculature for effective **prosthetic operation**. *5 - 10 cm* - A stump length of **5-10 cm** from the olecranon would be considered too short for a below-elbow amputation, making it difficult to achieve **adequate prosthetic suspension** and control of the artificial limb. - Such a short stump might be classified as a **very short below-elbow amputation**, which often requires specialized prosthetic designs and can limit functionality. *20 - 25 cm* - A stump length of **20-25 cm** from the olecranon would be considered too long for a below-elbow amputation, encroaching on the wrist and hand area. - An excessively long stump can make it challenging to fit a standard **transradial prosthesis** comfortably and effectively, and might even be classified as a **wrist disarticulation** if extending too far distally. *10 -15 cm* - While **10-15 cm** from the olecranon can sometimes be functional, it is often considered on the shorter end of the ideal range for a below-elbow amputation, potentially limiting the effectiveness of certain **prosthetic designs** and control mechanisms. - A stump in this range might work, but the **15-20 cm range** generally offers superior functional outcomes and easier prosthetic fitting.

Q: Shortest functional level of trans tibial amputation is:

Just distal to tibial tuberosity. **Just distal to tibial tuberosity** - This level allows for a **short residual limb** but still provides sufficient leverage for effective prosthetic control and weight-bearing. - Amputations at this level generally preserve the **knee joint**, which is crucial for maximizing function and ambulation. *Just proximal to tibial tuberosity* - An amputation **proximal to the tibial tuberosity** would result in a **knee disarticulation** or above-knee amputation, leading to a much greater functional deficit. - This level means losing the **knee joint**, which is not considered a trans-tibial amputation. *15 cm distal to joint line* - This level of amputation would result in a **longer residual limb** than necessary, which can be beneficial, but it's not the *shortest functional* level. - While functional, a longer limb might sometimes present challenges with prosthetic fit or bulk in certain situations. *10 cm distal to joint line* - Similar to 15 cm distal, this length is considered a **standard or optimal length** for trans-tibial amputations, resulting in good function. - However, it is not the **shortest possible functional level** while still retaining an effective limb for prosthetic use.

Q: All of the following statements about SACH feet are true, except:

Wooden keel absorbs the impact of heel strike. ***Wooden keel absorbs the impact of heel strike*** - This statement is incorrect because SACH feet do not have a **wooden keel** for shock absorption. - Instead, the **cushioned heel** itself absorbs the impact of heel strike. *May wear out with time* - **SACH feet**, like all prosthetic components, are subject to **wear and tear** from repeated use and environmental factors. - The materials used, such as rubber and foam, can degrade over time, necessitating replacement. *'SACH' stands for 'Solid Ankle Cushioned Heel'* - The acronym **SACH** accurately describes the design of this prosthetic foot. - It features a **solid ankle** component and a **cushioned heel** to provide shock absorption during gait. *Forms the base of a lower limb prosthesis* - The **SACH foot** is a fundamental component of many lower limb prostheses, regardless of the amputation level. - It provides the essential interface with the ground, enabling basic ambulation and stability for the user.

Q: What is the primary advantage of the Jaipur Foot prosthesis over conventional prosthetics?

Dr. Pramod Karan Sethi. ***Dr. Pramod Karan Sethi*** - The **Jaipur Foot** was developed in collaboration between **Dr. Pramod Karan Sethi**, an orthopedic surgeon, and Ram Chandra Sharma, a craftsman. - Their innovative design focused on creating a **low-cost, durable, and functional prosthetic limb** that could easily adapt to traditional Indian footwear and lifestyles. *Dr. A. P. J. Abdul Kalam* - **Dr. A. P. J. Abdul Kalam** was a renowned aerospace scientist and former President of India, known for his contributions to missile technology. - His work was primarily in **defense and space research**, not in prosthetic limb development. *Dr. Vikram Sarabhai* - **Dr. Vikram Sarabhai** is widely regarded as the father of the Indian space program. - He was instrumental in establishing the **Indian Space Research Organization (ISRO)** and other scientific institutions. *Dr. B. R. Ambedkar* - **Dr. B. R. Ambedkar** was a prominent social reformer, economist, and the chief architect of the Indian Constitution. - His contributions were primarily in **social justice, law, and politics**, not in medical prosthetics.

Question 1

What is the recommended distance from the olecranon for amputation?

Accepted Answer

15-20 cm

Answer

5-10 cm

Answer

10-25 cm

Answer

20-30 cm

Question 2

The shown apparatus is used for

Accepted Answer

Patella tendon bearing brace

Answer

Ankle knee stabilizer

Answer

Thomas splint

Answer

Knee brace

Question 3

All the following are advantages of the Jaipur foot over the conventional prosthetic foot except

Accepted Answer

Jaipur foot is electrically operated

Answer

Appearance of the Jaipur foot is that of normal foot

Answer

It is suitable for bare foot walking

Answer

Allows movement at fore foot and midfoot

Question 4

In below-elbow amputation the length of stump should be

Accepted Answer

15 - 20 cm

Answer

5 - 10 cm

Answer

20 - 25 cm

Answer

10-15 cm

Question 5

Shortest functional level of trans tibial amputation is:

Accepted Answer

Just distal to tibial tuberosity

Answer

Just proximal to tibial tuberosity

Answer

15 cm distal to joint line

Answer

10 cm distal to joint line

Question 6

All of the following statements about SACH feet are true, except:

Accepted Answer

Wooden keel absorbs the impact of heel strike

Answer

May wear out with time

Answer

'SACH' stands for 'Solid Ankle Cushioned Heel'

Answer

Forms the base of a lower limb prosthesis

Question 7

What is the primary advantage of the Jaipur Foot prosthesis over conventional prosthetics?

Accepted Answer

Dr. Pramod Karan Sethi

Answer

Dr. A. P. J. Abdul Kalam

Answer

Dr. Vikram Sarabhai

Answer

Dr. B. R. Ambedkar

Prosthetics and Orthotics — MCQs

Prosthetics and Orthotics — MCQs

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