Displaying publications 1 - 20 of 89 in total

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  1. Is nonoperative treatment still indicated for Jones fracture?
    Chiu CK, Vivek AS
    Eur J Trauma Emerg Surg, 2009 Aug;35(4):407.
    PMID: 26815058 DOI: 10.1007/s00068-008-8148-z
    INTRODUCTION: The issue of whether to treat Jones fracture surgically or nonsurgically is still controversial. In our institution, most acute Jones fractures are treated conservatively.

    OBJECTIVES: This study assessed the functional outcomes of patients with acute Jones fractures that were treated conservatively by means of radiographic assessment, a physician-based scoring system and patient-based questionnaires.

    METHODOLOGY: In this study, 25 patients with Jones fracture treated in our institution between January 2002 to December 2006, were retrospectively reviewed. Injuries were classified according to Jones' original description and the Torg classification. A simple patient satisfaction questionnaire was completed. Radiographic assessment of fracture union was recorded. Outcome instruments used were (a) the American Orthopaedic Foot and Ankle Society (AOFAS) clinical rating systemand (b) the American Academy of Orthopaedic Surgeons (AAOS) foot and ankle outcome questionnaire.

    RESULTS: Of the 25 patients reviewed, 60% were very satisfied with the outcome, 28% were satisfied, 8% were fairly satisfied, and 4% were very dissatisfied. Based on radiographic and clinical assessments, one patient had delayed union and was treated surgically. The functional outcome scores were: mean AOFAS clinical rating score of 95.6 ± 7.7% (P < 0.005), mean AAOS foot and ankle score of 97.0 ± 4.4% (P < 0.005) and mean AAOS shoe comfort score of 90.2 ± 19.6% (P < 0.005).

    CONCLUSIONS: Acute Jones fracture can be treated conservatively with good functional outcome.
  2. Chronic recurrent multifocal osteomyelitis of the first metatarsal bone: a case report
    Chiu CK, Singh VA
    J Orthop Surg (Hong Kong), 2009 Apr;17(1):119-22.
    PMID: 19398809
    We report a case of chronic recurrent multifocal osteomyelitis in a 9-year-old girl. She presented with a 9-month history of gradually worsening pain and swelling in her left foot. Non-steroidal anti-inflammatory drugs were prescribed but the symptoms persisted. She underwent curettage through a small oval corticotomy window on the first metatarsal bone. The pain and swelling improved promptly and she was able to walk without pain 2 weeks later. Curettage enabled rapid symptomatic relief and induced remission, with little risk of complications.
  3. Fulltext Chronic osteomyelitis secondary to human bite: a case report
    Tan W, Wazir N, Chiu C, Ko M
    Malays Orthop J, 2012 Nov;6(3):40-1.
    PMID: 25279055 MyJurnal DOI: 10.5704/MOJ.1207.003
    We report a case of a human bite that was initially inadequately treated and progressed to chronic osteomyelitis, finally resulting in digital amputation. Human bites are seemingly innocuous, but if neglected, may lead to subsequent infection and morbidity. Persistence of symptoms should alert the practitioner to the possibility of infection extending to the soft tissue or bone. Bacteriological studies commonly yield mixed aerobic and anaerobic flora. Early debridement and antibiotic treatment may prevent development of severe soft tissue or bone infection.
  4. Fulltext Management of osteonecrosis of the hip complicated with fracture: a case report
    Chua Y, Wazir N, Chiu C, Kareem B
    Malays Orthop J, 2012 Jun;6(SupplA):43-5.
    PMID: 25279075 MyJurnal DOI: 10.5704/MOJ.1211.011
    A 47-year-old gentleman, with underlying seborrhoeic dermatitis that was treated with steroid therapy, and hepatitis B, presented with pain in his right hip. He was diagnosed with stage 2 osteonecrosis of the right hip (Ficat and Arlet classification). Core decompression and bone grafting was performed but recovery was complicated by a surgical site infection. Wound debridement, removal of bone graft and clearance of the bone tunnel were carried out. The patient was allowed to bear weight after surgery. Twelve days later, he developed right hip pain and radiographs showed fractured femur neck; the patient then underwent a two-stage total hip replacement (THR).
  5. Fulltext Improved Accuracy and Safety of Intracorporeal Transpedicular Bone Grafting - using Contrast Impregnated Bone: A Case Report
    Chiu CK, Chan C, Kwan MK
    Malays Orthop J, 2014 Nov;8(3):27-9.
    PMID: 26401232 MyJurnal DOI: 10.5704/MOJ.1411.006
    A method of transpedicular bone grafting using contrast impregnated bone to improve the visualization of bone graft on the image intensifier is reported. A - 36-year old man who had sustained traumatic burst fracture of T12 vertebra, with Load-Sharing Classification (LSC) score of 8, was treated with posterior short segment fusion from T11 to L1 with transpedicular bone graft of T12 vertebra. We were able to correct the kyphotic end plate angle (EPA) from 19º to 1.4º. Anterior bone graft augmentation was achieved with contrast enhaced transpedicular bone grafts. At six months follow up, CT scan showed good bony integration of the anterior column with EPA of 4.5º and two years later, radiographs showed EPA of 7.6 º.
  6. Minimally invasive retrieval of incarcerated flexible intramedullary reamer
    Low TH, Loke YH, Chiu CK
    Eur J Orthop Surg Traumatol, 2012 Nov;22 Suppl 1:113-5.
    PMID: 26662760 DOI: 10.1007/s00590-012-0995-y
    Reaming is an integral step of long bone nailing and is associated with low complication rate. We report a case of a flexible reamer that was broken and incarcerated in the femoral canal during a femoral canal reaming. The reamer was used without a ball-tipped guide wire, and thus, the routine extraction using the guide wire was not possible. The incarcerated reamer was successfully extracted after medullary decompression with small drilling corticotomies adjacent to the reamer head. This case report serves as a reminder of the importance of using the ball-tipped guide wire with a flexible reamer. It also describes a simple and minimally invasive technique of removing an incarcerated flexible reamer.
  7. Scarf-Related Hangman's Fracture: A Case Report
    Chiu CK, Yin-Wei Chan C, Saw LB, Kwan MK
    Eur J Trauma Emerg Surg, 2010 Apr;36(2):180-2.
    PMID: 26815695 DOI: 10.1007/s00068-009-8212-3
    BACKGROUND: Injury to the cervical spine due to a scarfassociated accident has not been reported in the literature. We present a case of a hangman's fracture in a 43-year-old woman that resulted from a scarfrelated injury as a consequence of a motor vehicle accident.

    PURPOSE: To identify the mechanism of a scarf-related injury causing Hangman's fracture.

    CASE REPORT: A 43-year-old woman was involved in a motor vehicle accident. She was wearing a scarf, which is a common clothing accessory for women in Malaysia. The scarf was violently torn off her head during the injury, causing a type I hangman's fracture. A halo vest for a total period of 3 months was applied.

    CONCLUSION: A scarf-related injury can cause an injury that resembles judicial hanging, leading to a traumatic spondylolisthesis of the axis. Careful evaluation of the cervical spine radiographs is crucial as occult fracture of the axis can be missed.

  8. Fulltext Is the femoral neck geometry adequate for placement of the proximal femoral nail in the Malaysian population? A review of 100 cases
    Chiu CK, Chan CY, Singh VA
    Med J Malaysia, 2009 Mar;64(1):22-6.
    PMID: 19852315
    Issues that had been encountered during proximal femoral fracture fixation using proximal femoral nail include (i) the adequacy of the femoral neck width in the local population and (ii) the potential difficulty encountered during fixation in certain prefixed angles as determined by the implant. This was a retrospective, descriptive study evaluating the anterior-posterior pelvic radiographs of 100 consecutive patients, from January to August 2007, managed at University Malaya Medical Centre, Kuala Lumpur. The femoral neck width in the population studied was adequate for placement of femoral neck screw and anti-rotation pin or hip pin using the proximal femoral nail implant. (mean = 34.0 +/- 3.7 mm, min = 24.6 mm). There was no significant difference between the working area using an implant angled at 130 degrees or 135 degrees (P = 0.91). Both femoral neck width and neck shaft angle of the Malaysian population studied were not a factor influencing the placement of femoral neck lag screws and anti-rotation pin.
  9. Can Intraoperative Text Messages Reduce Parental Anxiety of Children Undergoing Posterior Spinal Fusion Surgery for Adolescent Idiopathic Scoliosis?
    Kwan MK, Chiu CK, Gan CC, Chan CY
    Spine (Phila Pa 1976), 2016 Feb;41(4):E225-30.
    PMID: 26579957 DOI: 10.1097/BRS.0000000000001199
    A prospective, nonrandomized study.
  10. Comparison between percutaneous fluoroscopic-guided and conventional open pedicle screw placement techniques for the thoracic spine: a safety evaluation in human cadavers
    Kwan MK, Chiu CK, Lee CK, Chan CY
    Bone Joint J, 2015 Nov;97-B(11):1555-61.
    PMID: 26530660 DOI: 10.1302/0301-620X.97B11.35789
    Percutaneous placement of pedicle screws is a well-established technique, however, no studies have compared percutaneous and open placement of screws in the thoracic spine. The aim of this cadaveric study was to compare the accuracy and safety of these techniques at the thoracic spinal level. A total of 288 screws were inserted in 16 (eight cadavers, 144 screws in percutaneous and eight cadavers, 144 screws in open). Pedicle perforations and fractures were documented subsequent to wide laminectomy followed by skeletalisation of the vertebrae. The perforations were classified as grade 0: no perforation, grade 1: < 2 mm perforation, grade 2: 2 mm to 4 mm perforation and grade 3: > 4 mm perforation. In the percutaneous group, the perforation rate was 11.1% with 15 (10.4%) grade 1 and one (0.7%) grade 2 perforations. In the open group, the perforation rate was 8.3% (12 screws) and all were grade 1. This difference was not significant (p = 0.45). There were 19 (13.2%) pedicle fractures in the percutaneous group and 21 (14.6%) in the open group (p = 0.73). In summary, the safety of percutaneous fluoroscopy-guided pedicle screw placement in the thoracic spine between T4 and T12 is similar to that of the conventional open technique.
  11. The accuracy and safety of fluoroscopically guided percutaneous pedicle screws in the lumbosacral junction and the lumbar spine: a review of 880 screws
    Chiu CK, Kwan MK, Chan CY, Schaefer C, Hansen-Algenstaedt N
    Bone Joint J, 2015 Aug;97-B(8):1111-7.
    PMID: 26224830 DOI: 10.1302/0301-620X.97B8.35330
    We undertook a retrospective study investigating the accuracy and safety of percutaneous pedicle screws placed under fluoroscopic guidance in the lumbosacral junction and lumbar spine. The CT scans of patients were chosen from two centres: European patients from University Medical Center Hamburg-Eppendorf, Germany, and Asian patients from the University of Malaya, Malaysia. Screw perforations were classified into grades 0, 1, 2 and 3. A total of 880 percutaneous pedicle screws from 203 patients were analysed: 614 screws from 144 European patients and 266 screws from 59 Asian patients. The mean age of the patients was 58.8 years (16 to 91) and there were 103 men and 100 women. The total rate of perforation was 9.9% (87 screws) with 7.4% grade 1, 2.0% grade 2 and 0.5% grade 3 perforations. The rate of perforation in Europeans was 10.4% and in Asians was 8.6%, with no significant difference between the two (p = 0.42). The rate of perforation was the highest in S1 (19.4%) followed by L5 (14.9%). The accuracy and safety of percutaneous pedicle screw placement are comparable to those cited in the literature for the open method of pedicle screw placement. Greater caution must be taken during the insertion of L5 and S1 percutaneous pedicle screws owing to their more angulated pedicles, the anatomical variations in their vertebral bodies and the morphology of the spinal canal at this location.
  12. Fulltext Closed reduction of traumatic bilateral anterior hip dislocations with sedation: a case report and review of the literature
    Chiu CK, Ng TS, Wazir NN, Bhurhanudeen KA
    Ulus Travma Acil Cerrahi Derg, 2015 Jan;21(1):63-7.
    PMID: 25779715 DOI: 10.5505/tjtes.2015.27475
    A rare case of bilateral anterior hip dislocation reduced under sedation was reported in this study. A 47-year-old man was knocked down by a car and sustained bilateral anterior hip dislocation which was reduced successfully with sedation using titrated dose of intravenous Midazolam in combination with Pethidine. A modified Lefkowitz maneuver using the manipulator's thigh as a fulcrum was used. Patient started weight bearing in the second month after injury and was walking without any hip pain at the twenty-fourth month follow-up. Thirteen case reports describing bilateral anterior hip dislocations were found while reviewing the literature and it was noticed that only one author had reported the usage of intravenous sedation (Propofol) for the reduction procedure. However, no author reported the use of Lefkowitz maneuver for this purpose. Consequently, reduction of a bilateral anterior hip dislocation is possible with sedation using a modified Lefkowitz maneuver.
  13. Assessing the Flexibility of the Proximal Thoracic Segments Above the "Potential Upper Instrumented Vertebra" Using the Cervical Supine Side Bending Radiographs in Lenke 1 and 2 Curves for Adolescent Idiopathic Scoliosis Patients
    Chan CYW, Chiu CK, Kwan MK
    Spine (Phila Pa 1976), 2016 Aug 15;41(16):E973-E980.
    PMID: 26909833 DOI: 10.1097/BRS.0000000000001516
    STUDY DESIGN: A prospective study.

    OBJECTIVE: The aim of this study was to analyze the proximal thoracic (PT) flexibility and its compensatory ability above the "potential UIV."

    SUMMARY OF BACKGROUND DATA: Shoulder and neck imbalance can be caused by overcorrection of the main thoracic (MT) curve due to inability of PT segment to compensate.

    METHODS: Cervical supine side bending (CSB) radiographs of 100 Lenke 1 and 2 patients were studied. We further stratified Lenke 1 curves into Lenke 1-ve: PT side bending (PTSB) 80.0% of cases of the PT segment were unable to compensate at T3-T6. In Lenke 1+ve curves, 78.4% were unable to compensate at T6, followed by T5 (75.7%), T4 (73.0%), T3 (59.5%), T2 (27.0%), and T1 (21.6%). In Lenke 1-ve curves, 36.4% of cases were unable to compensate at T6, followed by T5 (45.5%), T4 (45.5%), T3 (30.3%), T2 (21.2%), and T1 (15.2%). A significant difference between Lenke 1-ve and Lenke 1+ve was observed from T3 to T6. The difference between Lenke 1+ve and Lenke 2 curves was significant only at T2.

    CONCLUSION: The compensation ability and the flexibility of the PT segments of Lenke 1-ve and Lenke 1+ve curves were different. Lenke 1+ve curves demonstrated similar characteristics to Lenke 2 curves.

    LEVEL OF EVIDENCE: 3.

  14. Fulltext Rapid progression of scoliosis curve in a mature patient with undiagnosed pituitary macroadenoma: A rare case report
    Chung WH, Chiu CK, Wei Chan CY, Kwan MK
    Acta Orthop Traumatol Turc, 2020 Sep;54(5):561-564.
    PMID: 33155569 DOI: 10.5152/j.aott.2020.19144
    Growth hormone secreting pituitary tumor or gigantism has not been previously reported to be associated with rapid progression of scoliosis in the literature. However, there are some reports indicating scoliosis can be worsened by growth hormone therapy in children and adolescents. A 19-year-old boy was referred to our institution for the treatment of a right thoracolumbar scoliosis. The Cobb angle had worsened from 29° to 83° over two years' duration. He attained puberty at the age of 13. He had a previous history of slipped upper femoral epiphysis (SUFE), which was operated in 2015, with no clinical features of gigantism. Preoperative assessment was performed. He was diagnosed with growth hormone secreting pituitary macroadenoma by magnetic resonance imaging with a high serum level of insulin-like growth factor-I (IGF-I). Computed tomography (CT) of the pancreas showed a pancreatic endocrine tumor. The patient was later diagnosed with multiple endocrine neoplasia type 1 (MEN 1). He underwent endoscopic endonasal excision of the pituitary mass and distal pancreatectomy. This case indicates that growth hormone secreting pituitary macroadenoma could result in rapid progression of scoliosis.
  15. Accuracy and Safety of Pedicle Screw Placement in Adolescent Idiopathic Scoliosis Patients: A Review of 2020 Screws Using Computed Tomography Assessment
    Kwan MK, Chiu CK, Gani SMA, Wei CCY
    Spine (Phila Pa 1976), 2017 Mar;42(5):326-335.
    PMID: 27310021 DOI: 10.1097/BRS.0000000000001738
    STUDY DESIGN: Retrospective review of CT scan.

    OBJECTIVE: To investigate the accuracy and safety of pedicle screws placed in adolescent idiopathic scoliosis (AIS) patients.

    SUMMARY OF BACKGROUND DATA: The reported pedicle screws perforation rates for corrective AIS surgery vary widely from 1.2% to 65.0%. Knowledge regarding the safety of pedicle screws in scoliosis surgery is very important in preventing complications.

    METHODS: This study investigates the accuracy and safety of pedicle screws placed in 140 AIS patients. CT scans were used to assess the perforations that were classified according to Rao et al (2002): grade 0, grade 1 (<2 mm), grade 2 (2-4 mm), and grade 3 (>4 mm). Anterior perforations were classified into grade 0, grade 1 (<4 mm), grade 2 (4-6 mm), and grade 3 (>6 mm). Grade 2 and 3 (excluding lateral grade 2 and 3 perforation over thoracic vertebrae) were considered as critical perforations.

    RESULTS: A total of 2020 pedicle screws from 140 patients were analyzed. The overall total perforation rate was 20.3% (410 screws) with 8.2% (166 screws) grade 1, 2.9% (58 screws) grade 2 and 9.2% (186 screws) grade 3 perforations. Majority of the perforations was because of lateral perforation occurring over the thoracic region, as a result of application of extrapedicular screws at this region. When the lateral perforations of the thoracic region were excluded, the perforation rate was 6.4% (129 screws), grade 2, 1.4% (28 screws) and grade 3, 0.8% (16 screws). There were only two symptomatic left medial grade 2 perforations: one screw at T12 presented with postoperative iliac crest numbness and another screw at L2 presented with radicular pain that subsided with conservative treatment. There were six anterior perforations abutting the right lung, four anterior perforations abutting the aorta, two anterior perforations abutting the esophagus, and one abutting the trachea was noted.

    CONCLUSION: Pedicle screws insertion in AIS has a total perforation rate of 20.3%. After exclusion of lateral thoracic perforations, the overall perforation rate was 8.6% with a critical perforation rate of 2.2% (44/2020). The rate of symptomatic screw perforation leading to radicular symptoms was 0.1%. There was no spinal cord, aortic, esophageal, or lung injuries caused by malpositioned screws in this study.

    LEVEL OF EVIDENCE: 4.

  16. The accuracy and safety of fluoroscopic-guided percutaneous pedicle screws in the thoracic and lumbosacral spine in the Asian population: A CT scan analysis of 1002 screws
    Chiu CK, Chan CYW, Kwan MK
    J Orthop Surg (Hong Kong), 2017 May-Aug;25(2):2309499017713938.
    PMID: 28705124 DOI: 10.1177/2309499017713938
    PURPOSE: This study investigates the safety and accuracy of percutaneous pedicle screws placed using fluoroscopic guidance in the thoracolumbosacral spine among Asian patients.

    METHODS: Computerized tomography scans of 128 patients who had surgery using fluoroscopic-guided percutaneous pedicle screws were selected. Medial, lateral, superior, and inferior screw perforations were classified into grade 0 (no violation), grade 1 (<2 mm perforation), grade 2 (2-4 mm perforation), and grade 3(>4 mm perforation). Anterior perforations were classified into grade 0 (no violation), grade 1 (<4 mm perforation), grade 2 (4-6 mm perforation), and grade 3(>6 mm perforation). Grade 2 and grade 3 perforation were considered as "critical" perforation.

    RESULTS: In total, 1002 percutaneous pedicle screws from 128 patients were analyzed. The mean age was 52.7 ± 16.6. There were 70 male patients and 58 female patients. The total perforation rate was 11.3% (113) with 8.4% (84) grade 1, 2.6% (26) grade 2, and 0.3% (3) grade 3 perforations. The overall "critical" perforation rate was 2.9% (29 screws) and no complications were noted. The highest perforation rates were at T4 (21.6%), T2 (19.4%), and T6 (19.2%).

    CONCLUSION: The total perforation rate of 11.3% with the total "critical" perforation rate of 2.9% (2.6% grade 2 and 0.3% grade 3 perforations). The highest perforation rates were found over the upper to mid-thoracic region. Fluoroscopic-guided percutaneous pedicle screws insertion among Asians has the safety and accuracy comparable to the current reported percutaneous pedicle screws and open pedicle screws techniques.
  17. Fulltext Cervical Supine Side-Bending versus Cervical Supine Traction Radiographs: Which Is Better in Predicting Proximal Thoracic Flexibility for Lenke 1 and 2 Adolescent Idiopathic Scoliosis?
    Chiu CK, Bashir ES, Chan CYW, Kwan MK
    Asian Spine J, 2018 Aug;12(4):669-677.
    PMID: 30060375 DOI: 10.31616/asj.2018.12.4.669
    STUDY DESIGN: Prospective cohort study.

    PURPOSE: This study compared cervical supine side-bending (CSSB) and cervical supine traction (CST) radiographs to assess the flexibility and predict the correctability of the proximal thoracic (PT) curve for patients with adolescent idiopathic scoliosis (AIS) classified as Lenke 1 and 2.

    OVERVIEW OF LITERATURE: Knowledge of the flexibility of the PT curve is crucial in the management of patients with AIS. There are no reports comparing CSSB and CST radiographs to assess this parameter.

    METHODS: Thirty patients with Lenke 1 and 2 AIS scheduled for posterior spinal fusion surgery were recruited. A standing whole spine radiography and physician-supervised CSSB and CST radiographies were performed. Patient demographic and radiological parameters were recorded, including age, gender, weight, height, body mass index, PT angle, main thoracic angle, CSSB PT angle, CST PT angle, and postoperative PT angle. From the data collected, the curve flexibility and curve correction index were calculated and compared.

    RESULTS: CSSB had a significantly (p <0.05) smaller PT angle (16.6°±10.4°) in comparison to CST (23.7°±10.7°). CSSB had significantly (p <0.05) greater flexibility (44.2%±19.7%) in comparison to CST (19.5%±18.1%). The CSSB correction index (1.2±0.9) was significantly closer to 1 in comparison to the CST correction index (4.4±5.3). There was no difference (p =0.72) between the CSSB PT angle (16.6°±10.4°) and the postoperative PT angle (16.1°±7.5°). However, the CST PT angle (23.7°±10.7°) was significantly (p <0.05) larger than the postoperative PT angle (16.1°±7.5°).

    CONCLUSIONS: CSSB radiographs were better for demonstrating PT flexibility and more accurately predicted correctability in comparison to the CST radiographs.

  18. Single vs two attending senior surgeons: assessment of intra-operative blood loss at different surgical stages of posterior spinal fusion surgery in Lenke 1 and 2 adolescent idiopathic scoliosis
    Kwan MK, Chiu CK, Chan CY
    Eur Spine J, 2017 Jan;26(1):155-161.
    PMID: 27734195 DOI: 10.1007/s00586-016-4803-y
    PURPOSE: To assess the pattern of intra-operative blood loss at various surgical stages comparing between single and two surgeons.

    METHODS: Lenke 1 and 2 adolescent idiopathic scoliosis (AIS) patients who underwent instrumented posterior spinal fusion (PSF) surgery from two centres between June 2014 and December 2015 were prospectively recruited into this study. The patients were grouped into Group 1 (single surgeon) and Group 2 (two surgeons). One to one matching using 'prospective propensity score-matched cohort patient sampling method' was done. The surgery was divided into six stages: stage 1-exposure, stage 2-screw insertion, stage 3-release, stage 4-correction, stage 5-corticotomies and bone grafting and stage 6-closure.

    RESULTS: A total of 116 patients were recruited. Of 86 patients who were operated by the two surgeons, 30 patients were matched with 30 patients that were operated by a single surgeon. Operation duration was significantly longer in Group 1 (257.3 ± 51.4 min) compared to Group 2 (164.0 ± 25.7 min). The total blood loss was significantly higher in Group 1 (1254.7 ± 521.5 mL) compared to Group 2 (893.7 ± 518.4 mL). Total blood loss/level fused was significantly higher in Group 1 (117.5 ± 42.8 mL/level) compared to Group 2 (82.6 ± 39.4 mL/level). Group 1 had significantly higher blood loss and blood loss/level fused for stages 1, 2 and 3. Group 2 had lower incidence of allogenic blood transfusion.

    CONCLUSIONS: In PSF surgery for AIS patients, two-surgeon strategy was associated with shorter operation duration, lesser blood loss and lower incidence of allogenic blood transfusion.

  19. Assessment of Intraoperative Blood Loss at Different Surgical Stages During Posterior Spinal Fusion Surgery in the Treatment of Adolescent Idiopathic Scoliosis
    Chiu CK, Chan CY, Aziz I, Hasan MS, Kwan MK
    Spine (Phila Pa 1976), 2016 May;41(9):E566-73.
    PMID: 26630421 DOI: 10.1097/BRS.0000000000001304
    STUDY DESIGN: Prospective clinical study.

    OBJECTIVE: To analyze the amount of blood loss at different stages of Posterior Instrumented Spinal Fusion (PSF) surgery in adolescent idiopathic scoliosis (AIS) patients.

    SUMMARY OF BACKGROUND DATA: Knowing the pattern of blood loss at different surgical stages may enable the surgical team to formulate a management strategy to reduce intraoperative blood loss.

    METHODS: One hundred AIS patients who underwent PSF from January 2013 to December 2014 were recruited. The operation was divided into six stages; stage 1-exposure, stage 2-screw insertion, stage 3-release, stage 4-correction, stage 5-corticotomies and bone grafting, and stage 6-closure. The duration and blood loss at each stage was documented. The following values were calculated: total blood loss, blood loss per estimated blood volume, blood loss per minute, blood loss per vertebral level fused, and blood loss per minute per vertebral level fused.

    RESULTS: There were 89 females and 11 males. The mean age was 17.0 ± 5.8 years old. Majority (50.0%) were Lenke 1 curve type. The mean preoperative major Cobb angle was 64.9 ± 15.0°. The mean number of levels fused was 9.5 ± 2.3 levels. The mean operating time was 188.5 ± 53.4 minutes with a mean total blood loss 951.0 ± 454.0 mLs. The highest mean blood loss occurred at stage 2 (301.0 ± 196.7 mL), followed by stage 4 (226.8 ± 171.2 mL) and stage 5 (161.5 ± 146.6 mL). The highest mean blood loss per minute was at stage 5 (17.1 ± 18.3 mL/min), followed by stage 3 (12.0 ± 10.8 mL/min). The highest mean blood loss per vertebral levels fused was at stage 2 (31.0 ± 17.7 mL/level), followed by stage 4 (23.9 ± 18.1 mL/level) and stage 5 (16.6 ± 13.3 mL/level).

    CONCLUSION: All stages were significant contributors to the total blood loss except exposure (stage 1) and closure (stage 6). Blood loss per minute and blood loss per minute per level was highest during corticotomies (stage 5), followed by release (stage 3). However, the largest amount of total blood loss occurred during screw insertion (stage 2).

    LEVEL OF EVIDENCE: 2.

  20. Fulltext Prophylactic antibiotics in orthopaedic surgery: guidelines and practice
    Yeap JS, Lim JW, Vergis M, Au Yeung PS, Chiu CK, Singh H
    Med J Malaysia, 2006 Jun;61(2):181-8.
    PMID: 16898309
    The national clinical practice guideline has recommended that prophylactic antibiotic be given in orthopaedic surgery involving joint replacements and internal fixation of fractures. The aim of this study is to assess the current antibiotics prophylaxis practice in a state level hospital. One hundred and three patients (68 males, 35 females; mean age 41.6 +/- 22.2 years) undergoing internal fixation for closed fractures and joint replacement surgery were included in this prospective study. The choice of pre and post-operative antibiotics, their dosages and duration of administration were recorded. The pre-operative antibiotics were only deemed to have been given if it was documented in the case notes and in the case of post-operative antibiotics if it was signed on the drug chart. Eighty eight percent were given pre-operative prophylactic antibiotics and 92% were given post-operative antibiotics. For patients undergoing internal fixation of fractures, the most commonly used antibiotic for both pre and post-op is intravenous cefuroxime. For joint replacement surgery, the most commonly used antibiotic is intravenous cefoperazone. The duration or number of doses of post-operative antibiotics was highly variable. It was not stated in 56% of the post-operative instructions. Post-operative antibiotic was ordered for 48 hours or longer in 10%. In conclusion, prophylactic antibiotics appear to be widely practised. The first line antibiotics as recommended by the present guideline were not given in any of the patients. Second generation followed by third generation cephalosporins are the most popular antibiotics, with a trend towards using third generation cephalosporins in arthroplasty patients. Single dose prophylaxis was rarely practised.
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