Isometric muscle strength testing device for flexor and extensor muscles of knee joint

The utility model discloses an isometric muscle strength testing device for flexor and extensor muscles of a knee joint, comprising a testing control unit and a testing chair with a sensor, wherein a testing unit is electrically connected with the sensor; the testing chair comprises two front support legs, two rear support legs, a lower cross beam and an upper cross beam, wherein the upper cross beam is provided with a backrest, the position of which can be adjusted forwards and backwards, and the sensor is a tension/pressure sensor, two sides of the upper cross beam are respectively provided with an adjustable-length support rod, the top end of the support rod is provided with a short shaft, the inner side of the short shaft is provided with a long arm, and the lower part of the long arm is provided with a cross short arm, the position of which can be adjusted upwards and downwards; each front support leg is provided with a sliding sleeve, the position of which can be adjusted upwards and downwards; the tension/pressure sensor is fixed with the sliding sleeve; and a connecting piece consisting of the sliding sleeves and a sliding rod is arranged between the cross short arm and the tension/pressure sensor. Only by demarcation or calibration, the isometric muscle strength testing device can directly obtain the strength valve, the using purpose is very clear and the testing result is very visual.