McGregor, Ian A
(1971)
Theoretical and practical considerations in Zplasty practice.
Ch.M thesis, University of Glasgow.
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Abstract
The Zplasty is used in 2 main sets of circumstances: in contractures and in facial scars. In these situations it functions for practical purposes in a single plane, or, more accurately. its theoretical basis can be discussed in terms of 2 dimensions. There is, however, a group of miscellaneous uses for the zplasty which involve a third dimension, creating a curving Zplasty. In all of these circumstances certain modifications of method are necessary to make full use of its virtues. Many of these modifications arose Initially in the context of hand surgery, because of the strict limitations Imposed by the anatomical factors operating in the hand. The theoretical background of the Zplasty and the practical considerations arising therefrom are discussed In relation to these 4 aspects of its use. When the Zplasty Is used in contractures the lengthening which relieves the contracture is achieved at the expense of shortening In the axis perpendicular to the contracture. The amount of lengthening and the corresponding amount of shortening is shown to result from variation in the size of the Zplasty angles and the length of the Zplasty limbs. Formulae are developed to prove this fact and derive quantitative results. The formulae also permit elucidation of the factors which limit angle size and limb length of the Zplasty as used in practice. A rationale is also provided for the use of the multiple Zplasty, a modification of standard Zplasty technique used when tissue available for shortening is strictly limited. Used In scars, the Zplasty, by virtue of the fact that the central limb of the completed Zplasty lies at an angle to its preoperative line, is able to break the continuous line of the scar. Assuming that it is possible to design the Zplasty so that its central limb lies postoperatlvely on or parallel to a wrinkle the Zplasty will have the effect of converting a long and relatively conspicuous scar Into a series of short and less conspicuous scars connected by lines (represented by each zplasty central limb) lying In or parallel to the wrinkles. The method developed to enable the central limb to be placed with precision In terms of length, position and direction. Initially for the 60
Item Type: 
Thesis
(Ch.M)

Qualification Level: 
Masters 
Additional Information: 
Adviser: Ian McKie 
Keywords: 
Medicine, Surgery 
Date of Award: 
1971 
Depositing User: 
Enlighten Team

Unique ID: 
glathesis:197172116 
Copyright: 
Copyright of this thesis is held by the author. 
Date Deposited: 
17 May 2019 12:56 
Last Modified: 
17 May 2019 12:56 
URI: 
http://theses.gla.ac.uk/id/eprint/72116 
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