Joint Mechanics

We have discovered that almost all tango movements can be specified by describing the position and action of the joints.

Each joint in the body has different movement possibilities.

Hip

The base leg’s hip is always in external rotation. This causes the stabilizing muscles to contract to support and protect the joints of the leg from the weight of the body. It also enables the muscles of the leg to work more smoothly. For tango purposes, contraction of the hip rotator/stabilizer muscles also ensures integration of the leg with the torso so that information and power is directly transmitted to the partner.

The free leg is almost always in external rotation. The exception is that as the free leg passes the base leg between steps, while approaching the base leg, the hip relaxes very slightly into internal rotation to create a “natural” walking aesthetic.

The base leg’s hip is always flexed. This base flexion is accomplished by moving the tailbone backwards 2-5cm (not by arching the back or hinging the torso forward). The result of correct flexion of the base leg’s hip is a slight cant of the upper bodies toward the partner, which forms the skeletal structure of the arch of connection.

Notice that athletes are using hip flexion all the time, because it means they are contracting the quadriceps, the strongest muscle in the body!

 

During transfer of weight hip flexion changes in different ways for each step.

  • In front step, the back/sending leg’s hip extends, along with the knee and ankle to lever the body forward. However, the front/moving leg’s hip never loses flexion.
  • In back step, both legs’ hips increase flexion.
  • In side step, the change in hip flexion is slight.

In voleo, the hip joint moves before the knee joint.

  • In back voleo, the free leg’s hip joint extends completely.
  • In front voleo, the free leg’s hip joint adducts completely.
  • In side voleo (linear), the free leg’s hip abducts and then flexes.
Knee

In tango, flexion of the base leg’s knee joint controls the size of the step. (More flexion = longer step.)

There are no universal rules about the position of the base leg’s knee at the start and end of the step. This depends on the amount of power of the step, and on personal aesthetics.

The free leg’s knee should be fully extended during both first and second projection.

When marking crosses and ganchos, the mark’s back leg’s knee should be extended.

In voleos, the free leg’s knee flexes, but it is the last joint to move during this action.

Ankle

When bearing weight, the ankle joint’s flexion automatically co-varies with the knee joint.

  • In front and side steps, during the transfer of weight, the sending leg’s ankle joint should be fully extended as part of the control system of the step.
  • In back steps, during the transfer of weight, with the receiving leg’s knee fully extended in projection, ankle flexion of the receiving leg (which will place the heel onto the floor) will pull the receiving leg’s hip into correct position and flexion. (In addition, some dancers like to flex the sending leg’s ankle so as to push off with the heel at the last moment. Other dancers prefer to lift the sending leg’s heel so that the aesthetic of the deweighting leg is a pointed toe.)

During projection and in the air, the free leg’s ankle should always be fully extended, to create the aesthetic of a pointed toe. Occasionally we flex the free leg’s ankle as an adorno.

When pointed the ankle should not be rotated. Internal rotation of the ankle is called “sickle” and external rotation is called “winged”.

As the free leg approaches and passes the base leg during a step, with the hip relaxing into slight internal rotation, the ankle relaxes into flexion.

Shoulder

The shoulder joint is the most complex joint in the body, with the most possibilities for motion.

You can spend a lot of money with teachers telling you to “relax” your shoulders. This instruction is ineffective, because as soon as we start to concentrate, we tend to tense and lift the shoulders. Rather than trying not to perform an autonomic reaction, a more functional instruction is to make an action: externally rotate your shoulders by gently contracting the shoulder stabilizing muscles of the rotator cuff.

We will use the term ‘shoulder-flexion’ to refer to changes in the angle between the arm and the body. The shoulders can flex vertically, moving the elbow upward in front or behind the body (vertical shoulder-flexion), and they can flex laterally, moving the elbows from left to right (lateral shoulder-flexion)

When we are moving in the same direction as our partner, neither shoulder-flexion should change.

The shoulder-flexions are used for two types of change of embrace:

Elbow

If the shoulders are externally rotated, the elbows should be pointed toward the floor.

Elbow flexion and extension are used for a third type of change of embrace which is to give permission for the leaning movements, volcada and colgada.

The elbows accompany shoulder-flexion slightly to accommodate many different positions of the embrace. We prevent excess elbow flexion and extension by gently contracting the triceps muscle at all times. This keeps the embrace and the arch taut so that we have perfect connection for communication.

Wrist

The wrist joints also flex to accompany changes of embrace.

The base position of the Mark’s embrace should be with wrists extended. Some dancers flex the wrist (either palmar flexion, tilting towards the palm or dorsiflexion, tilting towards the back of the hand) as an aesthetic affectation, but it’s most comfortable and functional to keep the wrist extended so that the palms of the hands face toward and hold the Revel’s heart. This way the power created by the lower body is directed through the embrace toward her arc.

 

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