Question 1: Following a femoral shaft fracture, your consultant asks you to provide tibia traction. Which of the following will you request from the nurse?
1. Thomas splint
2. K-wire
3. Steinmann pin
4. Denham's pin
5. Bohler's stirrup
6. Bohler Braun splint
- A. $1,2,3,4,5,6$
- B. $3,5,6$ (Correct Answer)
- C. $3,4,5$
- D. $1,2,4$
Explanation: ***3,5,6***
- For **tibia traction** in a femoral shaft fracture, you would need a **Steinmann pin** for skeletal traction, a **Bohler's stirrup** to apply the traction force, and a **Bohler-Braun splint** to support the limb.
- The **Steinmann pin** is inserted into the proximal tibia, the **Bohler's stirrup** attaches to the pin, and the **Bohler-Braun splint** provides a fixed structure for the traction system.
*1,2,3,4,5,6*
- This option incorrectly includes items not specifically used for applying **tibia traction** (e.g., K-wire is for internal fixation, Thomas splint is for early femur fracture management but not specifically for tibia traction application).
- While some components might be used in general fracture management, not all are directly involved in setting up tibia traction as requested.
*3,4,5*
- This option correctly includes the **Steinmann pin** and **Bohler's stirrup** but incorrectly replaces the **Bohler-Braun splint** with a **Denham's pin**.
- A **Denham's pin** is an alternative to a Steinmann pin for skeletal traction, but a **Bohler-Braun splint** is crucial for supporting the limb in this setup, which is missing here.
*1,2,4*
- This option includes a **Thomas splint** (used for femur fracture support, not tibia traction application), a **K-wire** (used for internal fixation, not traction), and a **Denham's pin** (an alternative to Steinmann pin, but lacks the necessary support and traction application equipment).
- These items are not suitable for setting up comprehensive **tibia traction** for a femoral shaft fracture.
Question 2: Following a road traffic accident, a patient develops type IIIa compound tibial fracture. Arrange the following external fixators in decreasing order of their stability (highest to lowest)
1. Ilizarov fixator
2. Uniplanar with a single rod
3. Uniplanar with double rod
4. Biplanar frame/Ring with a cylindrical rod
- A. 1>4>3>2 (Correct Answer)
- B. 2>4>3>1
- C. 1>2>3>4
- D. 2>3>1>4
Explanation: ***1>4>3>2***
- **Ilizarov fixator** utilizes multiple wires **under tension** and rings, providing the most **biologically stable** and rigid fixation due to its distributed force across the bone.
- **Biplanar frames/Rings with a cylindrical rod** offer high stability by providing pin fixation in **two different planes**, significantly resisting bending and torsional forces.
- **Uniplanar with double rod** provides better stability than a single rod by increasing the **moment of inertia** and reducing deflection under axial and bending loads.
- **Uniplanar with a single rod** is the least stable due to its limited resistance to **torsional** and **bending forces** as pin placement is restricted to a single plane.
Question 3: If the outer sheath and nerve fibres are intact and the inner axon is damaged, it is known as
- A. Axonapraxia
- B. Neurotmesis
- C. Neurapraxia
- D. Axonotmesis (Correct Answer)
Explanation: ***Axonotmesis***
- This type of nerve injury involves damage to the **axon** itself, while the connective tissue layers (**endoneurium, perineurium, epineurium**) remain intact.
- While the axon is disrupted, the preservation of the nerve's outer sheath allows for potential, albeit slow, **regeneration** of the axon.
*Axonapraxia*
- This term is not a standard classification of nerve injury. The correct term for a transient block in nerve conduction is **neurapraxia**.
*Neurotmesis*
- **Neurotmesis** is the most severe type of nerve injury, involving complete severance of the **axon** and all supporting **connective tissue sheaths**.
- This type of injury requires **surgical repair** for any chance of functional recovery.
*Neurapraxia*
- **Neurapraxia** is the mildest form of nerve injury, characterized by a temporary **conduction block** without axonal damage.
- Recovery is typically complete within days to weeks, as the **myelin sheath** may be temporarily dysfunctional but the axon remains intact.