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Original ArticleOpen Access
Surgical Repair of Pars Defects in Spondylolysis
Prasartritha T 
Direct repair of the pars interarticularis defect was carried out in 16 spondylolysis
patients. There were 8 male and 8 female patients. The site of pars defects involved
L
5
in 10 cases
and L
4
in 6 cases. Chronic low back pain was the main symptom, only one patient presented with
acute severe back pain. Pars defects were confirmed by oblique views of the lumbosacral spine. The
height of the spinous process of the involved vertebra was measured and compared to the above
adjacent vertebra. Radiographic fusion of the defects was confirmed by bridging of bone across
the pars on oblique views. All the patients except one were treated conservatively prior to surgery.
Clinical outcomes were assessed by pre-and post-operative pain, union of the pars defects, func-
tional status and patient verbal rating scales.
The mean follow-up was 36 months, the longest was 7 years. At 2 years follow-up, the
overall satisfaction and improvement were reported in most of the patients. There was no func-
tional failure. Hypoplasia of the neural arch was found in 3 patients. There were two non unions,
both of them had maldevelopment of neural arches. One symptomatic non union needed resurgcry
for stabilization.
Key word
: Surgical Repair, Spondylolysis
patients. There were 8 male and 8 female patients. The site of pars defects involved
L
5
in 10 cases
and L
4
in 6 cases. Chronic low back pain was the main symptom, only one patient presented with
acute severe back pain. Pars defects were confirmed by oblique views of the lumbosacral spine. The
height of the spinous process of the involved vertebra was measured and compared to the above
adjacent vertebra. Radiographic fusion of the defects was confirmed by bridging of bone across
the pars on oblique views. All the patients except one were treated conservatively prior to surgery.
Clinical outcomes were assessed by pre-and post-operative pain, union of the pars defects, func-
tional status and patient verbal rating scales.
The mean follow-up was 36 months, the longest was 7 years. At 2 years follow-up, the
overall satisfaction and improvement were reported in most of the patients. There was no func-
tional failure. Hypoplasia of the neural arch was found in 3 patients. There were two non unions,
both of them had maldevelopment of neural arches. One symptomatic non union needed resurgcry
for stabilization.
Key word
: Surgical Repair, Spondylolysis
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