During isometric testing of the right quadriceps, a strong contraction with pain is produced. This finding MOST likely indicates which condition?

• A. Complete rupture of the quadriceps tendon
• B. Minor lesion of the quadriceps tendon
• C. Compression of the femoral nerve
• D. Disuse atrophy of the lower extremity

Answer: (B)

The main idea is that if you can generate a strong quadriceps contraction during a resisted, isometric test but it is painful, the problem is localized to the tendon rather than due to nerve damage or a complete rupture. A minor lesion of the quadriceps tendon means the muscle and nerve are intact enough to contract forcefully, but the tendon is irritated or partially torn, so loading it causes pain.

If the quadriceps tendon were completely ruptured, you wouldn’t be able to produce a strong contraction at all because the force would not be transmitted through the tendon, leading to little or no resistance. Nerve compression or injury (femoral nerve) would typically reduce the ability to contract forcefully (weakness) rather than produce a strong contraction that is simply painful. Disuse atrophy lowers strength over time and isn’t characterized by a painful, strong isometric contraction.

So, a strong contraction with pain during the isometric test best points to a minor lesion of the quadriceps tendon.