Assessing hip flexor tightness, specifically iliopsoas, with a simple supine test. In this test the patient lies on their back and one knee is brought to the chest to flatten the lumbar spine. The other leg is allowed to rest on the table. If that leg cannot lie flat on the table and the hip remains flexed (the thigh may rise off the table or the knee cannot fully extend), this indicates a tight iliopsoas on the tested side. A normal result is when the leg on the table lies flat with the knee extended, meaning there is no hip flexion contracture. Other tests target different structures: Obers tests the iliotibial band, Patrick’s (FABER) tests hip joint or sacroiliac pathology and hip flexor tightness, and Trendelenburg assesses abductor weakness.

Avascular necrosis of the femoral head occurs when the blood supply to the femoral head is disrupted, causing bone tissue to die and the head to collapse over time. This is classically linked to corticosteroid use and sickle cell disease, which both increase the risk of compromised blood flow to the bone. The scenario fits because those risk factors point to ischemia and subsequent necrosis rather than simple wear-and-tear or inflammatory bursitis. In contrast, osteoarthritis of the hip is a degenerative process of cartilage that leads to joint space narrowing and osteophyte formation, typically in older adults. Osteoporosis of the femoral neck is a density disorder that raises fracture risk but does not describe bone death from loss of blood supply. Trochanteric bursitis involves inflammation of a bursa over the greater trochanter, causing lateral hip pain, not avascular necrosis of the femoral head.

Lateralization of pain is a key way we describe different headache disorders. The best choice highlights that this kind of headache typically presents on one side. Migraine and cluster headaches are well known for unilateral pain, often localized around the eye or temple in the case of cluster and generally one-sided throbbing in migraine (though the side can vary between attacks). The other options don’t define a headache type: being female-predominant describes who is affected more often, not the presentation; intense pain describes severity rather than the syndrome’s pattern; radiating pain from back to front isn’t the characteristic pattern used to name a headache type. So describing it as unilateral captures the common presentation feature for these primary headaches.

Compression of the median nerve at the elbow, specifically under the pronator teres muscle, is the scenario here. When the median nerve is irritated in this location, you get insidious forearm pain and sensory changes in its distribution to the thumb, index, and middle fingers, which can extend to the palm. Repetitive forearm pronation and elbow flexion—like playing tennis—can worsen the pressure under the pronator teres and bring on the symptoms. Why the others don’t fit as well: anterior interosseous nerve entrapment affects only motor fibers to deep forearm muscles, so there would be weakness (like a pinch sign) without the sensory symptoms in the digits. posterior interosseous nerve entrapment and radial tunnel syndrome involve the radial nerve and typically produce motor weakness of finger extension or dorsal forearm pain, not the median nerve sensory pattern in the palm and the thumb–middle finger distribution.