eSystem Dynamic Care
  • Home
Home
eSystem Dynamic Care
  • Home

Variables In Construction For The Z- Plasty

Home Uncategorized Variables In Construction For The Z- Plasty
01
Jun
2016
No Comment

Variables In Construction For The Z- Plasty

Since the skin flaps must fit together in their transposed position, the limbs of the Z are con-structed equal in length. The angles of the Z are also usually made equal in size. The factors which do vary are angle size and limb length, and the ways in which variation in these factors affects the result provide an explanation of why specific constructions are used in particular sets of circumstances. 

Angle size.

Once the lengths of the limbs of the Z have been fixed the amount of lengthening to be expected is determined by the size of the angle, its amount increasing with increase in the size of the angle. With an angle of 30° there is theoretically a 25% increase in the original length, with 45° a 50% increase, and with an angle of 60° the increase rises to 75%.

These increases are theoretical and they cannot be applied with strict accuracy to the clinical situation, though when account is taken of variations in skin extensibility, pre-existing scar-ring, etc., it is surprising how well they do apply. The theoretical lengthening usually exceeds slightly what can be achieved in practice. In releasing a contracture the object of the Z- plasty is to maximise the amount of lengthening.

Narrowing the angle much below 60° would defeat this object, since the smaller angle would reduce the gain in length, and adversely influence the blood supply of the flaps. Increase in angle size much beyond 60° would increase the amount of lengthening, but it would also entail an equal increase in the amount of transverse shortening.

Tissue for transverse shortening is seldom available in unlimited quantity, and it is found in practice that when the angle increases beyond 60° the tension produced in the surrounding tissues tends to be so great that the flaps cannot read-ily be brought into their transposed position. For this reason 60° is the compromise figure used for angle size. Limb length.

With the use of 60° as the routine Z-plasty angle, it is length of limb which pro-vides the major variable in practice. The amount of tissue available on either side determines the practicable limb length -a large amount permits a large Z, a small amount correspondingly limits the size of the Z.

Relatived Posts
How To Distribut Wound Tension ( 17 May,2016 )
Single And Multiple Z-Plasty ( 3 Jun,2016 )
Use Of Undercutting ( 13 May,2016 )
Plastic Surgery ( 4 May,2016 )
The Basic Manoeuvre ( 28 May,2016 )

Leave Your Comment Cancel reply

Your Comment*

Your Name*
Your E-Mail*
Your Webpage

rss behance deviantart dribbble digg facebook forrst pinterest twitter