Wan Mohd Shaifulnizam, Che Wan Nik
(2009)
To determine the length of over penetration
during drilling procedure with K wire and Drill Bit
among orthopaedic's master student
Universiti Sains Malaysia.
Masters thesis, Pusat Pengajian Sains Perubatan.
Abstract
Drilling procedure is the most fundamental surgical skill required by
orthopaedic surgeon as many fractures nowadays are treated operatively. Neurovascular
injuries are known to be as one of the complications of over penetration drilling. The
purpose of this study is to determine the length of over penetration in drilling technique
among orthopaedic's master students Universiti Sains Malaysia. Fourteen juniors (Post Graduate Year 1 and 2) and fourteen seniors (Post
Graduate Year 3 and 4) were recruited in this study. They performed drilling procedure
on the bovine bone block using battery powered drill with 3.2mm drill bit and 2.0mm K
wire. Drilling was stopped immediately once they felt the penetration of far cortex. The
distance from the instrument's tip to the far cortex was measured. The procedure was
repeated three times and means values were calculated. The lengths of over penetration
results from the two instruments were compared using parametric paired t-test. The
lengths of over penetration results in "Experience Level" group and "Exposure to AO
course" group for each drilling instrument were compared by using non parametric
Mann-Whitney U test. The mean length of over penetration for drill bit and K-wire were 21.50 mm
(10.33-35.66 mm) and 10.18 mm (3.00-18.66 mm) respectively. Using drill bit, the
median length of over penetration for junior group and senior group were 25.55 mm and
16.66 nun respectively. With K wire, the median length of over penetration for junior
group and senior group were 16.50 mm and 5.50 mm respectively. For group exposed to
AO course, the median length of over penetration was 13.33 nun with drill bit and 5.00
mm with K wire. Those without exposure to AO course, the median length of over
penetration was 21.66 mm with drill bit and 10,66 mm with K wire. The differences were
statistically significant with regard to the instrument's type and "experience level" (all
p<O.OOl). The differences were also statistically significant with regard to "exposure to
AO course" group: p=0.02 with drill bit and p=0.05 for K wire There was a significant
correlation between training years in Post Graduate USM with personal experience in
Orthopaedic. Our study provides the overall result regarding the depth of over
penetration in drilling procedure among orthopaedic's master student Universiti Sains
Malaysia. It may benefit as the reference for related study in the future.
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