The Association of Preoperative Bone Mineral Density and Outcomes after Anterior Cervical Discectomy and Fusion: A Systematic Review.

STUDY DESIGN: This is a systematic review. OBJECTIVE: To evaluate anterior cervical discectomy and fusion (ACDF) outcomes and complications as a function of preoperative bone mineral density (BMD). SUMMARY OF BACKGROUND DATA: Preoperative BMD optimization is commonly initiated before lumbar spinal fusion, but the effects of BMD on ACDF are less known. Consequently, it remains unclear whether preoperative BMD optimization is recommended before ACDF. METHODS: This systematic review included relevant clinical articles using Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. We searched PubMed, Web of Science, SCOPUS, and MEDLINE from database inception until October 1, 2023. Eligible studies included those evaluating low BMD and outcomes after ACDF. All articles were graded using the Methodological Index for Non-Randomized Studies (MINORS) scale and Critical Appraisal Skills Programme (CASP) assessment tools. RESULTS: The initial retrieval yielded 4271 articles for which 4 articles with 671 patients were included in the final analysis. The mean patient age was 56.4 ± 3.9 years, and 331 patients (49.3%) were female. A total of 265 (39.5%) patients had low BMD (T score<-1.0) before ACDF. Preoperative low BMD was associated with cage subsidence in single-level ACDF (odds ratio (OR) 2.57; P=0.063; 95% Confidence Interval (CI): 0.95-6.95), but this result did not reach statistical significance. Osteoporosis (T score<-2.5) was associated with the development of adjacent segment disease following ACDF (OR 4.41; P<0.01; 95% CI: 1.98-9.83). Low pre-operative BMD was associated with reoperation within 2 years (P<.05) and strongly associated with pseudarthrosis (OR: 11.01; P=0.002; 95% CI 2.4-49.9). CONCLUSIONS: Patients with low BMD who undergo ACDF have higher rates of subsidence, adjacent segment disease, and pseudarthrosis than those with normal BMD. Given the individual and system-wide burdens associated with these complications, some patients may benefit from preoperative BMD screening and optimization before undergoing ACDF.

Multilevel Cervical Disk Arthroplasty: Moving Beyond Two Levels.

Cervical disk arthroplasty (CDA) is well-studied for 1-level and 2-level cervical pathology. There is an increasing trend towards its utilization for greater than 2-level disease as an alternative to the gold standard, anterior cervical discectomy and fusion (ACDF). The number of high-level, prospective studies or randomized trials regarding multilevel CDA is limited but continues to grow as the procedure gains popularity. In appropriately indicated patients with multilevel disease caused by disk herniations or spondylosis without extensive facet arthropathy, CDA shows promising results. Multilevel CDA should be avoided in patients with prior spinal trauma, significant degenerative spondylolisthesis with translation, arthrodesis without mobility, severely incompetent facet joints, ossification of the posterior longitudinal ligament, or kyphotic deformity. With overall similar risk profiles to ACDF but lower theoretical rates of pseudarthrosis and adjacent segment disease, multilevel CDA has been shown to preserve, or perhaps even increase, preoperative cervical range of motion. There are negligible differences in postoperative neck and arm pain, VAS scores, modified Japanese Orthopaedic Association scores, and Neck Disability Index scores when comparing multilevel CDA and ACDF. Despite current indications for multilevel CDA largely being based on single and 2-level data, careful patient selection is critical. Expansion of indications can be expected as literature continues to emerge regarding outcomes and complications in multilevel CDA, as well as with improvements in prosthesis design.

Learning curve associated with minimally invasive surgery for hallux valgus: A systematic review.

BACKGROUND: The purpose of this systematic review is to examine the learning curve associated with minimally invasive surgery (MIS) for the treatment of hallux valgus (HV). METHODS: A systematic review was performed using PubMed, ScienceDirect, Web of Science, CINAHL and MEDLINE databases from database inception to February 16th, 2023. Inclusion criteria was articles with level of evidence I-III, any outcomes associated with learning curve, minimally invasive surgery, and diagnosis of hallux valgus' in adult patients. RESULTS: Six articles out of 165 articles meet inclusion criteria. For all six articles, 368 total patients (422 total feet) were included in the study with an average age of 55.69 years. Three studies reported the number of surgeries needed to reach the plateau phase of the learning curve of MIS for HV, with a frequency weighted mean of 35.5 surgeries (range 27 - 40). In the selected articles, significant results were found for increased operating room (OR) time and fluoroscopy shots in the learning phase. There was no significant increase in complications in the learning phase. There was no significant decrease in patient outcomes, or the quality of correction performed during the learning phase. CONCLUSION: An average of 35.5 surgeries (range 27 - 40) are needed to reach the plateau phase for MIS for HV. The learning phase of the learning curve of MIS for HV has a significant increase in OR time and fluoroscopy usage. However, the learning phase of the learning curve of MIS for HV is not associated with decreased outcomes or higher complication rates based on the small sample size in this study. LEVEL OF EVIDENCE: Level III, Systematic Review.

Culturing explants for Cutibacterium at revision shoulder arthroplasty: an analysis of explant and tissue samples at corresponding anatomic sites.

BACKGROUND: Culturing of deep tissues obtained at revision arthroplasty for Cutibacterium is a key component of diagnosing a periprosthetic infection. The value of culturing explanted components has not been well described. This study sought to answer the following questions: (1) How does the culture positivity of explant cultures compare with that of deep tissue cultures? (2) How often are explant cultures positive when tissue cultures are not, and vice versa? (3) How does the bacterial density in explant cultures compare with that in tissue cultures? METHODS: A total of 106 anatomic arthroplasties revised over a 7-year period were included. Explant (humeral head, humeral stem, and glenoid) and tissue (collar membrane, humeral canal tissue, and periglenoid tissue) specimens were sent for semiquantitative Cutibacterium culture. We compared culture positivity and bacterial density when cultures of an explant and tissue adjacent to the implant were both available. RESULTS: Explants had positive cultures at a higher rate than adjacent tissue specimens for most anatomic sites. Of the shoulders that had Cutibacterium growth, a higher proportion of explants were culture positive when tissue samples were negative (23%-43%) than vice versa (0%-21%). The Cutibacterium density was higher in explants than in tissues. Considering only the results of tissue samples, 16% of the shoulders met our threshold for infection treatment (≥2 positive cultures); however, with the inclusion of the results for explant cultures, additional 14% of cases-a total of 30%-met the criteria for infection treatment. CONCLUSIONS: In this group of patients, culturing explants in addition to tissue cultures increased the sensitivity for detecting Cutibacterium in revision shoulder arthroplasty.

Randomized controlled trial of chlorhexidine wash versus benzoyl peroxide soap for home surgical preparation: neither is effective in removing Cutibacterium from the skin of shoulder arthroplasty patients.

INTRODUCTION: Home chlorhexidine washes prior to shoulder surgery are commonly used in an attempt to reduce the skin bacterial load. However, recent studies have suggested that this agent is relatively ineffective against Cutibacterium acne. Benzoyl peroxide soap is a treatment for acne, but evidence regarding its effectiveness as prophylaxis in shoulder surgery is lacking. Therefore, the objective of this study was to compare the effectiveness of home chlorhexidine washes with benzoyl peroxide soap (BPO) in patients undergoing shoulder arthroplasty surgery in reducing Cutibacterium levels on the skin surface and in the dermis. METHODS: Fifty male patients planning to undergo shoulder arthroplasty were consented to be randomized into treatment with 4% chlorhexidine solution (CHG) and 10% benzoyl peroxide soap (BPO) used to wash the operative shoulder the night prior and morning of surgery. Skin swabs prior to incision and dermal wound swabs after incision were obtained, and the bacterial load was reported in a semiquantitative manner as the Specimen Cutibacterium Value (SpCuV). The two groups were compared with regards to the percent positivity of the skin surface and incised dermal edge as well as the bacterial load at each site. RESULTS: Skin surface swabs were positive in 100% of patients using CHG and 100% of patients using BPO soap. The Cutibacterium load (SpCuV) on the skin surface was similar between the two groups (CHG 1.6 ± 1.1 vs. BPO 1.5 ± 1.4, p = 0.681). The percentages of dermal cultures that were positive were not significantly different between the two groups (CHG 61% vs BPO 46%, p = 0.369). The Cutibacterium load (SpCuV) on the incised dermal edge was similar between the two groups (CHG 0.8 ± 1.0 vs. BPO 0.8 ± 1.4, p = 0.991). DISCUSSION: Neither BPO soap nor chlorhexidine washes prior to shoulder surgery were effective in eliminating Cutibacterium from the skin surface or the incised dermal edge. Further study of means of reducing the Cutibacterium load of the skin at the time of shoulder arthroplasty is warranted.