CLS® Spotorno®
Product Information
The biomechanical concept of the cup aims at maintaining the physiological elasticity of the acetabulum. Three rows of self-cutting teeth cut into the acetabulum during the expansion process and provide mechanical primary and rotational stability.The elasticity of the CLS expansion cup prevents relative motion between the implant and bone. This promotes the ongrowth of new bone and thus facilitates biological stabilisation by osseointegration.
- First implantation 1986
- 17 years of excellent results
- More than 173.000 stems implanted
- Author: Prof. L. Spotorno
Indications
The indications for the CLS Spotorno Cup are rather varied. The CLS expansion cup is indicated in practically all forms of idiopathic coxarthrosis, ischaemic necrosis, rheumatoid arthritis and – with very good results – in protrusive forms. It is also suitable in replacement implantations following arthrodesis and after fractures of the acetabulum.
With an adequate surgical technique, the expansion cup can also be used for revisions in cases with major defects of the floor of the acetabulum; for primary implantations in cases with moderate osteoporosis; and for slightly dysplastic hips.
Insufficient peripheral anchorage constitutes a contraindication for the CLS cup.
In order to achieve an adequate press-fit in the region of the equator; adequate peripheral anchorage is essential. The absence of a rim segment of the acetabulum constitutes a contraindication. If the defect involves 1/4 of the rim of the acetabulum or more, then the contraindication is absolute, whereas a defect involving less than 1/6 of the circumference is well compensated and does not require any special precautions. The CLS cup can also be used in cases with a defect of the rim of the acetabulum of more than 1/6 and less than 1/4. In these cases, special attention has to be paid to the flanges. All six flanges must be supported by bone.
Due to the biomechanics of the pelvis, when changing from the sitting to the standing position, peak loading is exerted in the postero-superior quadrant. In the presence of inadequate bone structure, this zone has to be treated with special care. In the latter case, the lack of support at the rim of the acetabulum must not involve more than 1/6 of the circumference.