Figure 3.22 Posterior view of a right thoracic and left lumbar curves in the coronal plane. Pressure zones 41, 2, 30 and expansion zone 16 are represented in the figure as 41, 2, 30 and 16 respectively. The upward moment is represented as M. The thoracic convexity is to the right, therefore the pelvis tilt is to the left side. Pressure zone 41 pushes the pelvis between the two counterforces 2 and 30, therefore M is produced. This moves the left hemipelvis upward into expansion zone 16, as a result the pelvis is levelled, (Master by thesis, Wood, G 2003).
2.5.3 CLASSIFICATION OF KING
The classification of King, reported by King et al., (1983) distinguishes five different curve patterns or types (King type I through King type V) in a series of 405 patients, miscellaneous types were presented in four of 405 patients (Table 2.3). The King type is based on the clinical appearance and radiographic evaluation (Winter and Denis, 1994). The King type pattern is mainly classified by the characteristics of the coronal plane curve in reference to the midline. When using the classification of King, the midline refers a vertical line taken from the midline of the vertebral column, in which S1 or L5 is utilised at the centre of the pelvis.
2.5.4 CLASSIFICATION OF CURVE RELATIONSHIP
The classification of Cobb uses the term major and minor to classify the main and secondary scoliotic curves respectively by their location and flexibility (structural) in the vertebral column. However, the classification of Chêneau simplifies the scoliosis patterns into two groups by identifying the scoliosis as having one or two primary curves. The primary curve or curves always have two compensatory curves or half curves, one is located above and the other below the primary curve or curves. Therefore a pattern with one primary curve is a 3-curve scoliosis and a pattern with two primary curves is a 4-curve scoliosis. Whereas the classification of King has classified scoliosis into five patterns or King types by the characteristics of the curve in reference to the midline of S1 or L5. In addition to the reference of the midline of S1 or L5, King type I and King type II use the size of the lumbar and thoracic Cobb angles for classification.
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