Adductor Magnus

Clinical Notes

• Relevant to conditions/groin-strain — adductor magnus strains are less common than adductor longus strains but can occur with forceful abduction. When they do occur, they are often more severe because of the muscle's size and the forces involved.
• Relevant to conditions/hip-osteoarthritis — adductor magnus shortening contributes to the adduction contracture component of hip OA. The hamstring portion also contributes to the extension limitation.
• The adductor hiatus (gap between the two portions) is the passage for the femoral vessels becoming the popliteal vessels. Relevant to vascular anatomy and compression syndromes.
• Hamstring portion involvement in proximal hamstring tendinopathy — because the hamstring portion originates from the ischial tuberosity, it contributes to ischial pain alongside the true hamstrings. It is often missed in the assessment.

• Adductor magnus is often involved in chronic medial thigh tightness that does not resolve with treatment of the superficial adductors (adductor longus, gracilis). It is the deep layer — you must work through the superficial adductors to reach it.
• The hamstring portion frequently harbors TrPs in clients with ischial tuberosity pain, adding to the load on the "sit bone" region alongside the hamstrings and the deep six rotators (gemellus inferior, quadratus femoris).
• The proximal pelvic referral pattern from the adductor portion is frequently misdiagnosed. Clients (and clinicians) attribute the pain to the pelvic floor, the hip joint, or visceral sources. A careful assessment of the proximal adductor magnus often reveals the muscular source.

• The adductor portion responds to sustained compression and longitudinal stripping along the medial thigh, working deeper than the superficial adductor layer. Client in sidelying with the affected leg on top and the hip abducted provides good access.
• The hamstring portion is accessible from the prone position, working medial to the hamstring tendons at the ischial tuberosity and along the posteromedial thigh.
• Because of its size, adductor magnus requires patience — multiple passes along the medial thigh and posteromedial thigh are needed to address the full muscle.

• The femoral vessels pass through the adductor hiatus at the distal third of the medial thigh, transitioning from the femoral artery to the popliteal artery. Avoid deep sustained pressure in the distal medial thigh where the vessels dive posteriorly.
• The obturator nerve runs in the adductor compartment. Numbness in the medial thigh during treatment indicates nerve compression.
• Proximal medial thigh work is in a sensitive area. Clear communication and consent are essential.

• As a powerful adductor and hip extensor (hamstring portion), adductor magnus stabilizes the pelvis during gait. Weakness or inhibition contributes to lateral pelvic instability (alongside gluteus medius weakness) and reduced hip extension power.

• The dual innervation of adductor magnus is clinically useful. The adductor portion (obturator nerve, L2–L4) and the hamstring portion (tibial division of sciatic, L4) respond to different nerve root lesions. In an L4 radiculopathy, both portions can be affected (L4 is shared). In an L2–L3 lesion, only the adductor portion weakens. In an S1 lesion, the hamstring portion is more vulnerable. Testing adduction and hip extension separately can help localize the level of neural involvement.