{
    "@context": "https://schema.org",
    "@type": "Dataset",
    "name": "M. Vastus Medialis — surface EMG electrode placement",
    "id": "vastus_medialis_r",
    "slug": "vastus-medialis-r",
    "url": {
        "en": "https://emgguide.de/muscle/vastus-medialis-r",
        "de": "https://emgguide.de/de/muscle/vastus-medialis-r",
        "viewer3d": "https://emgguide.de/?muscle=vastus_medialis_r",
        "json": "https://emgguide.de/muscle/vastus-medialis-r.json"
    },
    "names": {
        "latin": "M. Vastus Medialis",
        "en": "Vastus Medialis",
        "de": "Innerer Schenkelmuskel"
    },
    "side": "right",
    "region": {
        "key": "THIGH_ANTERIOR",
        "en": "Thigh Anterior",
        "de": "Oberschenkel Vorne"
    },
    "placementStandard": "SENIAM (Hermens et al. 2000)",
    "source": {
        "url": "http://seniam.org/quadricepsfemorisvastusmedialis.html",
        "short": "SENIAM (Hermens 2000)",
        "citation": "Hermens HJ, Freriks B, Disselhorst-Klug C, Rau G. Development of recommendations for SEMG sensors and sensor placement procedures. J Electromyogr Kinesiol. 2000;10(5):361-74."
    },
    "electrode": {
        "position": {
            "en": "80% on line from ASIS to the joint space in front of the anterior border of the medial ligament",
            "de": "80% auf Linie von SIAS zum Gelenkspalt vor der Vorderkante des medialen Seitenbands"
        },
        "orientation": {
            "en": "Almost perpendicular to that line",
            "de": "Nahezu senkrecht zu dieser Linie"
        },
        "sensorRules": "bipolar Ag/AgCl, ≤ 10 mm conductive diameter, 20 mm inter-electrode distance, parallel to fibres, reference electrode on bone (SENIAM)"
    },
    "landmarks": {
        "rule": "electrode at fraction t of the line from a to b",
        "a": {
            "id": "asis",
            "en": "ASIS (anterior superior iliac spine)",
            "de": "SIAS (Spina iliaca anterior superior)",
            "model_xyz_m": null
        },
        "b": {
            "id": "medial_ligament",
            "en": "Anterior edge of the medial ligament",
            "de": "Vorderrand des medialen Seitenbandes",
            "model_xyz_m": null
        },
        "t": 0.8000000000000000444089209850062616169452667236328125,
        "extra": null,
        "note": null,
        "coordinates": "model space of the 3D viewer (metres, y up); for orientation only, not body measurements"
    },
    "anatomy": {
        "function": {
            "en": "Knee extension, medial patellar stabilization (VMO - important for patellar tracking)",
            "de": "Extension im Kniegelenk, Stabilisation der Patella nach medial (VMO — wichtig für Patella-Tracking)"
        },
        "origin": {
            "en": "Medial lip of the linea aspera, intertrochanteric line (distal)",
            "de": "Labium mediale der Linea aspera, Linea intertrochanterica (distal)"
        },
        "insertion": {
            "en": "Medial border of the patella -> via patellar ligament to the tibial tuberosity",
            "de": "Medialer Rand der Patella → über Lig. patellae an Tuberositas tibiae"
        },
        "innervation": {
            "en": "Femoral nerve, L2–L4",
            "de": "N. femoralis, L2–L4"
        }
    },
    "testMovement": {
        "en": "Terminal knee extension (last 15 degrees) against resistance",
        "de": "Endgradige Knieextension (letzte 15°) gegen Widerstand"
    },
    "placementNotes": {
        "source": "Criswell E. Cram's Introduction to Surface Electromyography. 2nd ed. Jones & Bartlett; 2011, p. 366",
        "site": "Vastus Medialis (Oblique)",
        "placementType": "specific",
        "signalCheck": {
            "de": "Im Sitzen das Knie strecken; im Stand teilweise in die Hocke gehen.",
            "en": "Seated: extend the knee; standing: partial squat."
        },
        "crosstalk": {
            "de": [
                "Rectus femoris",
                "Adductor longus",
                "Adductor magnus"
            ],
            "en": [
                "rectus femoris",
                "adductor longus",
                "adductor magnus"
            ]
        },
        "artifacts": null
    },
    "mvcTest": {
        "source": "Konrad P. The ABC of EMG. Noraxon; 2005, p. 32",
        "group": "quadriceps",
        "en": {
            "position": "Seated, single-leg knee extension held between 90° and 70° knee flexion.",
            "fixation": "Thigh and pelvis fixed on the seat; a strap at the ankle holds the knee angle.",
            "resistance": "Fixed strap at the ankle, extension against it.",
            "control": "—",
            "note": "Konrad: an easy and beneficial exercise for all quadriceps muscles (rectus femoris, vastus lateralis, vastus medialis)."
        },
        "de": {
            "position": "Sitzend, einbeinige Kniestreckung, gehalten zwischen 90° und 70° Kniebeugung.",
            "fixation": "Oberschenkel und Becken auf dem Sitz fixiert; ein Gurt am Sprunggelenk hält den Kniewinkel.",
            "resistance": "Fixierter Gurt am Sprunggelenk, Extension dagegen.",
            "control": "—",
            "note": "Konrad: eine einfache und ergiebige Übung für alle Quadriceps-Anteile (Rectus femoris, Vastus lateralis, Vastus medialis)."
        }
    },
    "measurability": "surface EMG",
    "license": "Free to cite with attribution to emgguide.de. Electrode placements based on SENIAM (Hermens et al. 2000) and the cited literature; not an official SENIAM product; not a substitute for medical advice.",
    "publisher": {
        "name": "EMG Guide (menios GmbH)",
        "url": "https://emgguide.de/"
    },
    "dateModified": "2026-10-21"
}