The effect of smoking on union rates following corrective osteotomies around the knee: A systematic review and meta-analysis

BACKGROUND

Distal femur osteotomies (DFO) and high tibial osteotomies (HTO), are well-established treatment options for joint preservation in active patients with uni-compartmental osteoarthritis. Optimal outcomes are contingent on adequate preoperative evaluation of patient-specific factors. This systematic review and meta-analysis aims to explore the difference in union rates between smokers and non-smokers following corrective osteotomies around the knee.

METHODS

A systematic search of the MEDLINE and EMBASE databases was performed in accordance with the PRISMA guidelines to identify studies reporting smoking status in adults who developed delayed and/or non-union following HTO or DFO. Studies were pooled using a random effect model [Review Manager (RevMan) software, V.5.4] and heterogeneity was estimated using I2.

RESULTS

Data for meta-analysis was available for 1,406 osteotomies from 10 studies, performed in patients with mean age ranging from 38-54 years, and 65% were male. The union rate among non-smokers was 97.3% (1100/1131) compared with 89.5% (246/275) among smokers; OR 4.59 [95% CI 1.99 to 10.62], p-value < 0.001. Subgroup analysis revealed that the risk of non-union in smokers after opening wedge osteotomy was almost double (OR 4.8) that of closing wedge osteotomies (OR 2.9).

CONCLUSION

Smoking increases the risk of non-union during elective knee osteotomy surgery. Our findings also suggest that smokers have a better chance of achieving union with closing wedge osteotomy compared to open wedge osteotomy.

Single vs. double drain in modified radical mastectomy: A randomized controlled trial

Objectives

It was aimed to test the hypothesis that the use of a double drain results in less seroma formation, duration of the hospital stay, surgical site infection (SSI), postoperative pain, hematoma, flap necrosis compared to a single drain in patients undergoing modified radical mastectomy.

Material and Methods

This parallel-group, single-institution randomized controlled trial was conducted at the department of surgery of our institute between April 2015 and July 2018. Women undergoing modified radical mastectomy were randomly allocated to either a single drain (n= 98) or double drain (n= 98).

Results

Both groups were comparable for baseline variables such as age, co-morbidity, BMI, and tumor characteristics. The variables of single drain yielded no better outcomes compared to double drain with estimated blood loss (101.67 ± 25.14 vs.101.67 ± 24.40, p> 0.001), drain volume (898.81 ± 116.42 vs 803.97 ± 103.22 mL, p> 0.001), duration of surgery in minutes (103.19 ± 15.96, 103.19 ± 15.93) and seroma formation (13.4% vs 6.1%, p= 0.082). However, single drain yielded less postoperative pain (mean 2.5 ± 0.70 vs 5.22 ± 5.10, p <0.000). On multivariable Cox regression analysis, single drain was associated with a lower risk of significant postoperative pain [adjusted relative risk 0.14 (95% confidence interval (CI) 0.070-0.25)] and overall complications [adjusted relative risk 0.47, (95% CI 0.26-0.86)]. On multiple linear regression, the duration of drains in the single drain group was 0.01 days less than double drain (r2= 0.00, b= 0.388, p> 0.001).

Conclusion

The use of a single drain significantly reduces postoperative discomfort and pain while demonstrating similar morbidity to the patient with two drains. We thus recommend preferential use of a single drain in modified radical mastectomy (NCT02411617).

Comparison of retrobulbar anesthesia and intracameral anesthesia using preservative free bupivacaine hydrochloride 0.5% in phacoemulsification with posterior chamber intraocular lens implantation

OBJECTIVE

To compare the retrobulbar anesthesia and intracameral anesthesia using preservative-free bupivacaine hydrochloride 0.5% in terms of effectiveness, complications and comfort to the patient during phacoemulsification with posterior chamber intraocular lens implantation.

METHODS

This was a hospital based comparative study of two methods of anesthesia, conducted at LRBT Free Eye and Cancer Hospital, Lahore from January to July 2000. Study included 200 patients with uncomplicated age-related cataract, equally divided in two groups on simple random basis. Group A (100 patients) received the retrobulbar anesthesia and Group B (100 patients) received the intracameral anesthesia with bupivacaine hydrochloride 0.5% for phacoemulsification with posterior chamber intraocular lens implantation. Outcome measures like pain, visual acuity, intraocular pressure and anterior chamber reaction were compared.

RESULTS

On day 1, 79% of the patients in group A and 82% patients in group B had unaided visual acuity ranging between 6/6-6/18. On day 7, this was 88% in group A and 89% group B. On day 1, 99% in group A and 98% in group B had <1+ cells in the anterior chamber while on day 7 this increased up to 100%. On day 1, 97% in group A and 98% group B had intraocular pressure less than 20 mmHg. On day 7, it increased up to 100% in both groups. 97% patients in group A and 96% patients in group B had painless surgery. Results were analysed using computer software SPSS version 10.0. Results showed no significant statistical difference between two groups in terms of pain, visual acuity, intraocular pressure, anterior chamber reaction and patient comfort.

CONCLUSION

In the hands of expert surgeons and in selected patients, intracameral anesthesia with preservative-free bupivacaine hydrochloride 0.5% is a safe and effective technique of ocular anesthesia for phacoemulsification with posterior chamber intraocular lens implantation.