Skip to main content

Table 2 Comparison between the cases with poor clinical outcomes and those with good outcomes

From: Surgical outcomes of the thoracic ossification of ligamentum flavum: a retrospective analysis of 61 cases

 

Poor n = 31

Good n = 30

Age, average, average (range), years

65.9 ± 15.2 (22–90)

57.8 ± 16.3 (20–81)*

Sex, female/male, No.

13/18

8/22

Duration of disease, average (range), months

20.4 ± 29.2 (1-144)

14.7 ± 17.6 (1–72)

Concurrent spinal canal stenosis, No.

Cervical [Non-C-OPLL/C-OPLL]

8 (25.8%)[4/4]

15 (50.0%)[7/8]

LCS [Spondylosis/Spondylolisthesis/L-OPLL]

27 (87.1%)[14/12/1]

19 (63.3%)[12/6/1]*

Height, average (range), cm

157.1 ± 11.0 (134–176)

163.4 ± 8.2 (148–179)*

Body weight, average (range), Kg

65.8 ± 14.7 (44.2-103.4)

74.4 ± 22.4 (46.7-100.7)

Dual Energy X-ray Absorptiometry

Lumbar YAM, average (range), %

101.9 ± 14.7 (75–116)

104.3 ± 19.9 (77–147)

Femoral YAM, average (range), %

90.0 ± 24.8 (62–137)

77.3 ± 9.6 (66–95)

MMT, average (range),

Preoperative

3.1 ± 1.4 (0–5)

3.5 ± 1.4 (0–5)

Operation

Surgical procedure

LAM/PDF, No

23/8

21/9

Decompressed OLF levels, average (range), No.

1.5 ± 0.9 (1–4)

1.5 ± 0.9 (1–4)

Operative time, average (range), min

150.6 ± 90.3 (48–436)

163.0 ± 105.8 (56–460)

Blood loss, average (range), mL

259.2 ± 726.4 (1-4090)

311.5 ± 463.2 (1-1725)

Outcomes

Recovery rate of T-JOA score, average (range), %

15.8 ± 13.4 (-10-36.4)

63.4 ± 19.9 (40–100)*

VAS, average (range), mm

Preoperative

77.2 ± 21.4 (30–100)

66.1 ± 28.4 (0-100)

Postoperative

56.6 ± 27.0 (10–100)♰

47.9 ± 30.9 (10–100)

Complication, No

4 (12.9%) [Dural tear, Hematoma, Vertebral fracture, SSI = 1]

4 (13.3%) [Dural tear = 2, Hematoma, Enlargement of T-OPLL = 1]

Radiological findings

Local kyphosis, average (range), degrees

Preoperative

8.9 ± 10.2 (0–45)

9.4 ± 6.2 (1–32)

Postoperative

10.6 ± 11.0 (0–50)

11.8 ± 7.7 (2–37)

CT

DISH, No.

9 (29.0%)

10 (33.3%)

OLF, Unilateral/Bilateral/Bridged, No.

7/20/4

5/19/6

Thickness of OLF, average (range), mm

3.2 ± 1.6 (1-6.7)

4.0 ± 2.3 (1–10)

MRI

OLF, Round/Beak, No.

18/13

19/11

Modic change, No.

13 (41.9%)

11 (36.7%)

HIA, No.

24 (77.4%)

27 (90.0%)

  1. Abbreviation: MMT manual muscle test, T-JOA the Japanese Orthopaedic Association for thoracic myelopathy, VAS visual analog scale, CT computed tomography, MRI magnetic resonance imaging, OPLL ossification of the longitudinal ligament, LCS lumbar spinal canal stenosis, YAM young adult mean, LAM laminectomy, PDF posterior decompression with fusion, OLF ossification of the ligamentum flavum, SSI surgical site infection, DISH, diffuse idiopathic skeletal hyperostosis, HIA high-intensity areas
  2. *p < 0.05 when compared to the poor outcome group
  3. ♰p < 0.05 when compared to the preoperative status
Back to article page

BMC Musculoskeletal Disorders

ISSN: 1471-2474

Contact us