What Are The Steps In The Cumulative Injury Cycle - T-Tees - Your Answers Await, Life's Questions Unraveled

Constant Pressure/Tension Injury

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These two factors decrease circulation and compromise cell recovery. Three major results are cellular retention of calcium, poor repair, and altered function. This injury type, by definition, does not require motion. An isometric contraction, or the muscle tension of poor posture, are good examples of the mechanism of injury.

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THE CUMULATIVE INJURY CYCLE

The cyclic nature of injury – one factor triggering the next in a circular series – has been described for many years. The components of the cycle are defined as follows:

Weak and Tight Tissues

Repetitive effort, for example, tends to make muscles tighten. A tight muscle tends to weaken; a weak muscle tends to tighten. And on it goes.

Friction – Pressure – Tension As a result of weak and tight tissues, internal forces rise. Friction, pressure, or tension can be present at the same time. If one or more of these factors is high, an acute injury and inflammation can result – even without external forces being applied.

Decreased Circulation – Edema

The affect of increased forces on the tissues is decreased circulation. If pressure is applied over one of the vulnerable, low-pressure lymphatic channels, the result is edema. External forces – in the form of a constant-pressure or tension injury – may also decrease circulation or cause edema.

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Adhesion – Fibrosis

Cellular hypoxia, from restricted circulation, causes fibrosis and adhesions to occur in an between tissues. When the friction-pressure-tension factor is severe, or when an acute injury occurs, two additional factors come into play.

Tear or Crush

The physical disruption of the tissues – microscopic or macroscopic – can occur with sufficient force. This can be an external force, acute injury, or it can result internally.

Inflammation

This results from the injury and starts the adhesion process. The cycle progresses then to the “weak-and-tense” phase. There are many extrinsic factors which affect the cycle, but, they do it in predictable ways. Smoking, for example, tends to decrease circulation, helping to perpetuate the cycle. Diabetes has a similar affect. Thyroid deficits tend to increase tension in the musculature and therefore influence the “weak-and-tense” factor of the cumulative-injury cycle. Hormonal changes – as with hysterectomy, excessive body weight, and pregnancy – lead to predictable alterations to the involved factors. The cumulative-injury cycle is defined with two possible routes: the inflammatory cycle and the chronic cycle. Each is independent of the other, however, they both may be present together.

Conditions

The cumulative-injury cycle is self perpetuating. It worsens the symptoms and syndromes of cumulative-trauma disorders with a downward-spiral effect. These include carpal-tunnel and cubital-tunnel syndrome, epicondylitis, tenosynovitis, myofascitis, bursitis, peripheral-nerve entrapment, thoracic-outlet syndrome. De Quervain’s disease. None of these conditions are a cumulative-trauma disorder without the affects of the cumulative-injury cycle.

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