Per Elsais et al. 2020 Hip Right

M. Adductor Magnus

Adductor Magnus (Add Mag R)

The M. Adductor Magnus (Adductor Magnus) is a muscle of the hip region. It is responsible for hip adduction, anterior fibers: flexion, posterior fibers: extension and internal rotation. This muscle is not covered by the official SENIAM catalogue — placement is based on established clinical literature. This page documents the exact electrode position, anatomical attachments and a standardized test movement based on Hermens et al. (2000).

Function

Hip adduction, anterior fibers: flexion, posterior fibers: extension and internal rotation

Opposite side: Add Mag L

Rotate the body, see the electrode position in place — and check the neighbouring muscles right away. View in 3D Viewer

Electrode Placement (SENIAM)

Orientation: Along the muscle fibres, 2 cm inter-electrode distance. Borders were located by ultrasound in the source - without ultrasound this is an approximation and crosstalk from adjacent adductors is possible

Source: Elsais et al. 2020 ↗

Elsais WM, Preece SJ, Jones RK, Herrington L. Could relative movement between the adductor muscles and the skin invalidate surface electromyography measurement? Monten J Sports Sci Med. 2020;9(2):21-26.

Methodological background of the source

Elsais et al. (2020) examined whether relative movement between the adductor muscles and the skin invalidates surface EMG measurements. For the adductors this is a real issue, because the skin of the medial thigh shifts noticeably during hip movement. The position shown here follows the placement used in that study.

Based on SENIAM recommendations (Hermens et al. 2000). Not an official SENIAM product. See all references → · How electrodes are placed (guide) · Glossary

Go deeper Which Muscles Cannot Be Measured With Surface EMG — and Why → MVC Normalisation — Why Microvolts Alone Say Nothing →

All 47 muscle protocols as a PDF — free

Print-ready for the lab or clinic: 75 pages of protocols (SENIAM + peer-reviewed), plus the SENIAM table, a placement checklist and a sensor comparison sheet as A4 sheets.

Anatomy

Origin Inferior ramus of the pubis, ramus of the ischium, ischial tuberosity Insertion Linea aspera (medial lip), medial epicondyle of the femur (adductor tubercle)

Test Movement

Thigh adduction against resistance

This muscle has no SENIAM-standardized electrode position. Placement should be based on anatomical knowledge.

MVC reference test (Konrad 2005)

Position: Supine or seated with flexed legs; a big, stiff roll cushion is pressed between the knees.
Fixation: The cushion itself provides the rigid resistance; pelvis stable.
Resistance: Isometric adduction against the cushion.

Konrad tests the adductors as one group ("Mm. adductores"); surface EMG does not separate longus, magnus and gracilis.

Konrad P. The ABC of EMG. Noraxon; 2005, p. 32. Konrad describes this test at group level; it applies to all muscles of the group. · Why and how to normalise to MVC

Measure M. Adductor Magnus activity live

The electrode is placed — what next? easyEMG visualises muscle activity in real time, with SENIAM-compliant placement guidance, up to 4 channels at once and biofeedback training right afterwards.

In rehabilitation, the Adductor Magnus is typically recorded to track progress and retrain activation.

EMG biofeedback in physiotherapy → What is EMG biofeedback?

Frequently Asked Questions

Where do I place the EMG electrode on the M. Adductor Magnus?

At 60% of the distance from the greater trochanter to the lateral knee joint line, in the middle of the muscle belly between the posterior border of gracilis and the anterior border of the medial hamstrings. Orientation: Along the muscle fibres, 2 cm inter-electrode distance. Borders were located by ultrasound in the source - without ultrasound this is an approximation and crosstalk from adjacent adductors is possible. Not covered by SENIAM — placement per Elsais et al. 2020.

Which test movement activates the M. Adductor Magnus?

Thigh adduction against resistance. It serves as a signal check before recording: with correct electrode placement the EMG amplitude rises clearly during this movement.

Is the M. Adductor Magnus a SENIAM-recommended muscle?

No. The M. Adductor Magnus is not included in the official SENIAM catalogue. The electrode position documented here follows the established protocol per Elsais et al. 2020.