Article Figures & Data
Figures
- Fig. 1
Sagittal (a) and axial (b) MRI of a 45 year old woman with severe right leg pain caused by an L5-S1 synovial cyst.
Tables
Without spondylolisthesis n = 35 With spondylolisthesis n =18 P Gender 1.000 Male 17 (49%) 9 (50%) Female 18 (51%) 9 (50%) Age (years)* 62 ± 12 63 ± 12 0.376 Side 0.780 Left 16 (46%) 9 (50%) Right 19 (54%) 9 (50%) Level 0.867 L3-4 4 (11%) 3 (17%) L4-5 27 (77%) 13 (72%) L5-S1 4 (11%) 2 (11%) Cyst size* (mm) 8 ± 4 10 ± 5 0.239 Low back pain 0.565 Present 20 (57%) 12 (67%) Absent 15 (43%) 6 (33%) Weakness 0.104 Present 3 (9%) 5 (28%) Absent 32 (91%) 13 (72%) Values are numbers of patients with (%) except when marked with *;
↵* Values contain mean ± SD.
Without spondylolisthesisn = 35 With spondylolisthesisn =18 P Operative time (min) 184 ± 34 178 ± 31 0.599 Blood loss (mm) 40 ± 11 45 ± 9 0.096 Length of stay (days) 0.17 ± 0.4 0.5 ± 1.0 0.101 Values contain mean ± SD.
Without spondylolisthesis With spondylolisthesis P 1-8 weeks post-op n = 35 n = 18 1.000 Excellent 25 (71%) 13 (72%) Good 10 (29%) 5 (28%) Fair 0 0 Poor 0 0 >8 weeks post-op* n = 28 n = 12 0.425 Excellent 20 (71%) 7 (58%) Good 5 (18%) 2 (17%) Fair 3 (11%) 2 (17%) Poor 0 1(8%) Values are numbers of patients with (%).
↵* Mean (SD) follow-up: 200 weeks (175) weeks.
- Table 4
Review of published case series on minimally invasive resection of synovial cysts through tubular retractor.
Present study Sandhu et al, 2004 Sehati et al, 2006 James et al, 2012 Sukkarieh et al, 2015 Patients characteristics n of patients 53 17 19 16 13 Mean age 63 64 64 67 66 % of synovial cyst at L4-5 75% 82% 84% 56% 69% % of Grade 1 spondylolisthesis 34% 47% 11% 56% 31% Operative Data Approach Ipsilateral Ipsilateral Ipsilateral Contralateral Contralateral Operative time (min) 182 97 158 105 123 Average blood loss (ml) 41 35 31 <40 44 % patients discharged within 24 hours from surgery 80% 82% 68% 50% >50% Mean length of follow-up (months) 14.8 ± 33.7 13 ± 11.0 16 (range 4-29 mo) 14 ± 9.4 20.8 ± 16.9 Outcome (Macnab modified criteria) Excellent 70% 82% 53% 69% 69% Good 19% 12% 42% 31% 8% Fair 9% 0% 5% 0% ? * Poor 2% 6% 0% 0% ? * Complications Intraoperative CSF leak 4% 6% 11% 12.5% 0% Postoperative symptomatic csf leak 2% 0% 0% 0% 0% Postoperative instability requiring lumbar fusion 6% 6% 0% 0% 0% Recurrence or new synovial cyst at the same level 4% 0% 0% 0% 0% ↵* Authors reported patients as having persistent pain without specifying if the pain improved or stayed the same.
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