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MicroHip
The dogma of "major surgery, major incisions" ended with major changes in the understanding of human biology and the growing awareness that every incision not only induces trauma, but also may lead to permanent destruction of tissues. This not only causes greater postoperative pain and increases hospitalisation and rehabilitation times, but also may sometimes result in a significant loss of fine motor control. Of crucial significance is not just the length of the cut, but also and, most importantly, the type of structures affected. Muscles and tendons are undoubtedly the most important structures in this respect. Some, like the abductor muscles—particularly the gluteus medius and medius—play a central role in various body functions, such as perception. Thus, damage to nerves supplying these structures should be minimised or completely avoided.
An ideal minimally invasive approach should not only spare muscles and tendons altogether, but should also lie in an internervous plane. In other words, there should be no nerve braches passing through the plane of access to the surgical site. This is the difference between the MicroHip technique developed by us and the OCM technique practiced by Röthinger in Munich. In the MicroHip procedure, we use a short segment of the Smith-Peterson approach to the hip joint, which is located in the internervous plane between the tensor fascia lata and rectus/sartorius muscles. The OCM technique, on the other hand, uses an approach passing between the gluteus medius and tensor facia lata muscles. This plane corresponds to a section of the Watson-Jones
approach, which is not located in an internervous plane. An important segment of the nerve branch supplying the tensor fascia lata muscle extends through the interval of the gluteus medius and tensor fasciae lata muscles. Thus, when the OCM approach is used, there is a relevant risk of damaging this nerve branch. Such an injury results in impaired function of the tensor fasciae lata muscle, which is particularly important for certain sports, such as running and cycling.

The arrow points to the branch of the gluteus superior nerve, which is often damaged when using the OCM approach. The MicroHip approach does not have this risk.
The MicroHip procedure (see below) completely avoids this problem because it uses a surgical approach located in an internervous plane (see above) and does not involve any cutting of muscles or tendons. Moreover, the joint capsule is left intact, which is an advantage, not only in terms of stability. It has also been shown that nerve fibres are present in the joint capsule. Their function in fine motor control of the joint should not be taken lightly. MicroHip has other significant advantages that should not be underestimated: Leaving the joint capsule intact results in a considerable reduction of the size of the wound and a corresponding reduction of postoperative pain. In addition, it decreases intraoperative blood loss and postoperative scarring.


