An adductor is a muscle that pulls a limb toward the midline of your body. The term most commonly refers to the five muscles running along your inner thigh that work together to bring your legs inward, stabilize your hips, and help control rotation. These muscles are the adductor longus, adductor brevis, adductor magnus, gracilis, and pectineus.
Where the Adductors Are
The adductor group sits in the medial (inner) compartment of your thigh, forming the fleshy area you can feel along your inner leg between the groin and the knee. They fan out from attachment points on the pelvis and connect at various places along the thighbone. The adductor magnus is the largest of the five and sits deepest, forming a broad sheet of muscle at the back of the inner thigh. The adductor longus and brevis layer in front of it, closer to the surface. The gracilis is the thinnest, running the full length of the inner thigh all the way down past the knee. The pectineus sits highest, near the crease of the groin.
What Adductors Actually Do
Their primary job is hip adduction: squeezing your legs together. You use them every time you cross your legs, side-shuffle, change direction while running, or grip a horse or bicycle with your thighs. But adduction is only part of the story.
The adductors also contribute to hip stability in the frontal plane, which is what keeps your pelvis level when you stand on one leg or walk. Research in the Journal of Functional Morphology and Kinesiology has confirmed that the adductor group shortens during internal rotation of the hip, meaning these muscles actively help rotate your thigh inward. Three of the five (pectineus, adductor longus, and adductor brevis) also assist with hip flexion when the leg starts in a neutral position, and can switch to assisting with hip extension when the hip is already bent. This dual capability makes them especially active during movements like sprinting, kicking, and skating, where the hip rapidly shifts between flexed and extended positions.
How They’re Controlled by the Nervous System
Most of the adductor group is controlled by the obturator nerve, which originates from the second, third, and fourth lumbar vertebrae in your lower spine. The nerve splits into two branches: the front branch powers the adductor longus, adductor brevis, and gracilis, while the back branch handles the adductor magnus. The pectineus is a bit of an outlier, sometimes receiving nerve supply from both the obturator nerve and the femoral nerve.
The adductor magnus itself is unique because it has dual innervation. Its front portion receives signals through the obturator nerve like the rest of the group, but its back portion (sometimes called the hamstring part) is supplied by the sciatic nerve. A case study published in PubMed demonstrated this clearly: after a patient had a sciatic nerve tumor removed, the hamstring portion of their adductor magnus wasted away while the front portion, served by the obturator nerve, remained completely normal. This dual nerve supply reflects the fact that the adductor magnus essentially functions as two muscles in one.
Adductor Strains and Groin Injuries
Adductor strains are one of the most common soft-tissue injuries in sports that involve sudden direction changes, kicking, or skating. They account for a large share of what people casually call “groin pulls.” These injuries are graded on a three-level scale:
- Grade 1: Swelling within the muscle but no structural tearing. You’ll feel pain, but strength and range of motion stay mostly intact.
- Grade 2: A partial tear with fluid collecting inside the muscle. Pain is more significant, and you’ll notice a real loss of strength.
- Grade 3: A complete rupture or avulsion, where the muscle or tendon fully separates.
Acute strains typically heal in 4 to 8 weeks. Grade 3 tears managed without surgery average about 9 weeks for a full return to activity, while surgical cases average around 14 weeks. Chronic strains that linger or recur can take considerably longer.
Testing Adductor Strength
The standard way clinicians and athletic trainers assess adductor function is the bilateral hip adduction squeeze test. You lie on your back with your legs straight, and a device is placed between your ankles. You then squeeze your legs together as hard as you can. This test is widely used in professional sports settings because it reliably measures peak adduction force and can flag weakness or asymmetry that might indicate a developing problem. A noticeable difference in squeeze strength between your two sides, or a significant drop compared to a baseline measurement, is a common early warning sign for groin injuries.
Keeping the Adductors Strong
Weak adductors are a well-established risk factor for groin injuries, particularly in athletes. One of the most studied prevention tools is the Copenhagen adductor exercise, a partner-based side plank where you use your top leg to support your body weight while your partner holds your ankle. A systematic review found that athletes who performed the Copenhagen exercise program had a 41% lower risk of groin injury compared to those who didn’t. The exercise works because it loads the adductors eccentrically, meaning the muscles lengthen under tension, which builds the kind of resilience that protects against the sudden, forceful movements that cause strains.
For non-athletes, the adductors still matter. They play a key role in balance, walking stability, and getting in and out of chairs or cars. Simple exercises like seated ball squeezes, side-lying leg lifts, and lateral lunges can keep them functional without any special equipment.