Which condition may cause the hind limb to be held in extension?

Which condition may cause the hind limb to be held in extension?

• A. Hip Dysplasia
• B. Poliomyelitis
• C. Sciatica Neuralgia
• D. Peroneal Nerve Palsy

Answer: (C)

Pain and guarding from irritation of the sciatic nerve can cause the hind limb to be held straight in extension. When the sciatic nerve is inflamed or compressed, bending the hip or knee can increase nerve tension and pain, so the animal adopts a fixed, extended limb posture to minimize stretch and discomfort. This pattern fits with sciatic neuralgia more than the other conditions. Hip dysplasia tends to produce hip pain with guarding that often includes external rotation and altered stance rather than a persistently extended limb. Poliomyelitis causes weakness and atrophy with reduced muscle tone, often leading to dragging or flexed positions rather than a maintained extension. Peroneal nerve palsy affects distal muscles, typically causing foot drop or knuckling, not a global hind limb extension.

Pain and guarding from irritation of the sciatic nerve can cause the hind limb to be held straight in extension. When the sciatic nerve is inflamed or compressed, bending the hip or knee can increase nerve tension and pain, so the animal adopts a fixed, extended limb posture to minimize stretch and discomfort. This pattern fits with sciatic neuralgia more than the other conditions. Hip dysplasia tends to produce hip pain with guarding that often includes external rotation and altered stance rather than a persistently extended limb. Poliomyelitis causes weakness and atrophy with reduced muscle tone, often leading to dragging or flexed positions rather than a maintained extension. Peroneal nerve palsy affects distal muscles, typically causing foot drop or knuckling, not a global hind limb extension.