Tag: lengthening

A multiplanar deformity analysis can be both simple and complex: a correct determination of angular and metric deformity apex and plane is a fundamental task. This is true in both the preoperative surgery planning and the postoperative management phases, in order to obtain the most accurate correction and promote the quickest recovery for the patient’s well-being.

The initial assessment of any lower extremity deformity is fundamental to plan a successful surgical program of correction, as well as an effective post-operative management of the healing process. The assessment should include the X-rays of full length weight bearing of both legs, with a complete axis evaluation to fix the position of the deformities, which is “the true plane of the deformity”.

Although several studies have reported good results of the treatment of the lower extremity deformity combined with shortening – a condition that often means disabling impairment in the daily life activities – to date there are still very few studies that review the evidence by comparing the outcomes of acute versus gradual correction.

The term CORA (Center of Rotation of Angulation) means a method of mechanical and anatomical axis planning based on joint orientation, which has gained international recognition and acceptance. Many surgeons from all over the world apply this method to limb lengthening and deformity correction, and the CORA principles and concepts have clearly shaped both design and functionality of the last generation of external devices.

Bone deformity is a three-dimensional issue, considering the three-dimensional shape of bones and joints. All basic considerations of deformity correction by using an external device should include the fundamental concepts of Anatomical and Mechanical Axis. These concepts allow a better understanding of the effects of adjustments or modifications in one plane when managing a three-dimensional problem such as bone deformity.