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Anatomy
Anatomy
Knee Joint Range of Motion
Evidence-grounded — sourced from Fysiqal's fitness knowledge graph· 1 min read
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In one line
The knee is a hinge joint: extension 90°, flexion 120° (hamstring knee-flexion ROM stated as 125°).
Detail
The knee joint is a hinge joint. The Joint ROM chart lists knee extension at 90 degrees and knee flexion at 120 degrees. In quadriceps training the knee-joint ROM is given as 90 degrees. In hamstrings training, knee flexion ROM is stated as 125 degrees. From a standing position to a knee-bending position at 90 degrees, the knee joint experiences 8 times more pressure.
Key facts
- Knee is a hinge joint.
- Knee extension: 90° (chart); quadriceps training ROM: 90°.
- Knee flexion: 120° (chart); hamstring knee-flexion ROM: 125°.
- At 90° of knee bend, the knee experiences 8× more pressure than standing.
Connections
- quadriceps — extend the knee.
- hamstrings — flex the knee.
- knee-toe-relationship — knee alignment safety in the squat.
- joint-range-of-motion-chart — master ROM table.
SourceReference manual
p.144p.400p.688
Cited authorities in source: Kennedy & Legel (1992).
Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.
Explore related topics
Atlas Connections
Hamstrings
Three 2-joint muscles — biceps femoris, semitendinosus, semimembranosus — that flex the knee (primary) and extend the hip (secondary); knee-flexion ROM 125°.Joint Range of Motion ChartClosely related
Reference table of degree-of-motion values for the hip, knee, spine, arm/shoulder, neck, and foot (Kennedy & Legel, 1992).Knee-Toe Relationship
A squat-alignment concept balancing keeping the knees from passing the toes against keeping the spine vertical — the "happy medium."Quadriceps
The four knee extensors — rectus femoris, vastus medialis, vastus lateralis, vastus intermedius (rectus femoris also flexes the hip); knee ROM 90°.