The intra-articular injection model of the knee joint is a training tool commonly used in orthopedic and rehabilitation medicine teaching, mainly for simulating the operation of knee joint cavity puncture and drug injection. To test the training effect, it is necessary to clarify the success criteria to ensure that trainees master standardized clinical skills.

The criteria for success include the following aspects

First of all, the positioning is accurate. The operator can correctly select common puncture points based on the anatomical landmarks of the knee joint, such as the inner lower edge or outer lower edge of the patella, to avoid mistakenly entering the extra-articular tissues.

Secondly, the needle insertion technique is standardized. The puncture needle enters at a reasonable Angle and with uniform force. There is no obvious sensation of obstruction or deviation during the process, avoiding damage to the articular cartilage and surrounding tissues.

Secondly, the judgment of entering the cavity was correct. Trainees can identify whether the needle tip has entered the joint cavity by the feel of the needle body and the change in resistance, and confirm the position inside the cavity by suction or injection of simulated fluid.

In addition, the injection process should be smooth and fluid, with the simulated liquid being able to enter the cavity smoothly without obvious leakage or reflux. The entire operation must comply with aseptic principles and maintain the stability of the technique.

Finally, after the operation is completed, the equipment should be properly disposed of and the model kept clean to ensure its reusability.

By meeting the above standards, intra-articular injection training of the knee joint can not only enhance the practical operation ability of the trainees, but also lay a solid foundation for the safe and effective implementation of injection treatment in clinical practice in the future.