Journal List > J Korean Soc Spine Surg > v.17(4) > 1075913

Kim, Won, and Lee: Management of Deep Wound Infection After Posterior Lumbar Interbody Fusion With Cages

Abstract

Study Design

Retrospective study

Objective

The purpose of this study was to analyze patients who developed deep wound infections after receiving PLIF for degenerative lumbar disease, and report the treatment outcomes.

Summary of Literature Review

Few studies have examined deep wound infections after PLIF, and there is some controversy regarding whether screws or cages need to be removed to treat infections.

Materials and Methods

Nine cases(spinal stenosis 6, spondylolisthesis 3) developed a deep wound infection after PLIF from 2001 to 2007. The mean follow up was 48 months (24-72). The clinical results were evaluated using MacNab's criteria.

Results

The diagnosis of infection was made based on the clinical symptoms and signs, and inflammatory markers, such as ESR and CRP. The time to diagnosis was less than one week (2), three weeks (2), six weeks (1) and three months or more (4). Bacterial identification was performed on seven cases. MRSA was detected in one of them, and no bacteria were identified in the other six. In two of them, the infection subsided with antibiotic therapy only. In 7 cases, removal of the cage and anterior iliac strut graft was needed for infection control. In four cases, loosened screws were removed during debridement. In 2 cases, additional surgery for pseudarthrosis was required after curing the infection.

Conclusions

In deep infections after PLIF, early diagnosis and bacterial identification are important for reducing the need for a later radical operation. It is recommended that blood markers of infection be measured with a short follow-up period. In a case of persistent infection against prolonged antibiotics, removal of the cage or screw is needed to treat the infection earlier.

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Fig. 1.(A)
Preoperative lateral x-ray shows wide destruction of L4 and L5 around cage. (B) Extension lateral view shows widened gap between cage and vertebral bodies.
jkss-17-184f1.tif
Fig. 2.
Contrast enhanced MRI shows that widened gap between cage and vertebral bodies was filled with enhanced granulation tissue.
jkss-17-184f2.tif
Fig. 3.
Patient underwent anterior curettage, anterior fusion with iliac strut graft and posterior pedicle screw fixation.
jkss-17-184f3.tif
Fig. 4. (A)
Postoperative 1 year x-ray revealed bony union across the L4,5 bodies. (B) sagittal CT showed bony bridges across the vertebral bodies.
jkss-17-184f4.tif
Table 1.
Summary of Patient's Data
Case No. Age/ Sex Fusion Level Time Interval (week) From Surgery to Onset of Infection Antibiotic (Treatment) Isolated Bacteria Abnormal Motion on Dynamic X-rays Fusion Status Patient Satisfaction Compared With Their Status Before the Index Procedure (2y) Signs of Infection ODI at F/U
1 56/F L4-L5 36 Vancomycin Targocid No No Fused S LBP증가 Increased ESR, CRP Bony erosion -
2 70/M L4-L5-S1 20 Vancomycin No Yes Uncertain S LBP증가 Increased ESR, CRP Bony erosion -
3 66/M L4-L5 3 Vancomycin Targocid No No Fused S LBP증가 Increased ESR, CRP Bony erosion -
4 67/F L3-L4-L5-S1 44 Vancomycin No No Fused Adj. problem US LBP증가 Increased ESR, CRP Bony erosion -
5 61/F L4-L5-S1 1 Cefmenoxime Nesomicin Vancomycin Cefroxadine No No Uncertain S Increased ESR, CRP Bony erosion -
6 72/M L4-L5 52 Oxacephem Vancomycin Teicoplanin MRSA Yes Fused S LBP증가 Increased ESR, CRP Bony erosion -
7 65/M L3-L4-L5 3 Oxacephem Cefroxadine No No Fused S Fever, Discharge Increased ESR, CRP Bony erosion 10
8 58/F L3-L4-L5 1 Oxacephem Cephalexin No No Fused S LBP Increased ESR, CRP Bony erosion 7
9 66/M L4-L5 6 Cefazedine Brosporin No Yes Fused S LBP증가 Increased ESR, CRP Bony erosion 15

F, female; M, male; MRSA, methicillin-resistant Staphylococcus aureus; ODI, Oswestry Disability Index; LBP, lower back pain; F/U, follow-up; S, satisfactory; US, unsatisfactory

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