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In early ACL rehab, closed-chain exercises (like partial squats, step-ups, and leg presses) are preferred because they minimize anterior shear forces on the tibia and reduce stress on the healing ligament. Open-chain extension from 0–30° (B) places high strain on the ACL and is avoided early. Deep squats with heavy resistance (A) and plyometric drills (D) are introduced later in functional phases, not in the initial stage.

This reflects NATA/ACSM therapeutic intervention guidelines emphasizing safe progression from protected strengthening to functional and sport-specific activity.

The priority is to stabilize the head and neck in the position found, preventing any movement that could worsen spinal cord damage.

Manual realignment (A) is only for trained professionals if airway is compromised. Helmet removal (C) is avoided unless necessary for airway management. Standing (D) is unsafe.

This reflects ACSM/NATA EAP protocols: immobilization and coordination with EMS are critical.

Dynamic valgus often results from weak hip abductors. Gluteus medius strengthening (clamshells, lateral walks) corrects mechanics, reducing ACL injury risk.

Hamstring curls (B) strengthen posterior thigh but don’t address hip control. Calf raises (C) focus on lower leg. Bench press (D) is unrelated.

ACSM/NATA therapeutic programs stress hip strengthening for ACL prevention.

This is likely commotio cordis, a sudden cardiac arrest from chest impact. The correct response is immediate CPR and AED application.

Oxygen (A) is supportive but not lifesaving without circulation. Sitting upright (C) and waiting (D) are ineffective.

ACSM/NATA protocols emphasize rapid defibrillation as the only proven survival measure.

The Neer’s test reproduces pain by forcing shoulder flexion with internal rotation, compressing the rotator cuff tendons under the acromion—suggestive of impingement.

Lachman’s (B) tests ACL. Valgus stress (C) tests MCL. Thompson (D) evaluates Achilles rupture.

Accurate test selection demonstrates clinical reasoning, a core competency for NATA/ACSM evaluation standards.