Category: Statistics

J Orthop Trauma. 2021 Apr 5. doi: 10.1097/BOT.0000000000002135. Online ahead of print.

ABSTRACT

OBJECTIVES: To identify the incidence of distal articular fractures in a series of distal third tibia shaft fractures and to report the utility of both computed tomography (CT) scans and RIDEFAST ratios5 for identification of articular involvement.

DESIGN: Retrospective cohort.

SETTING: Level 1 trauma center.

PATIENTS: 417 distal third tibia shaft fractures.

INTERVENTION: Intramedullary nail or plate fixation.

MAIN OUTCOME MEASURES: Type of articular fracture, time of diagnosis, and RIDEFAST ratios.

RESULTS: 101 of the 417 distal third fractures (24%) had a fracture of the distal tibia articular surface. Of these 101 fractures, 41 (41%) represented an extension of the primary fracture line and 60 (59%) were separate malleolar fractures. 95 of the 101 articular fractures (94%) were identified preoperatively, and 6 were identified intra-operatively (6%). Of the 95 fractures identified preoperatively, 87 (92%) were identified on plain radiographs and 8 (8%) by CT scan. 35 preoperative CT scans were performed on distal third tibia shaft fractures in search of an intra-articular fracture. In 27 patients (77%), no articular fracture was present, representing an overall yield of 23% among CT scans performed to rule out an articular fracture in distal third tibia shaft fractures. RIDEFAST ratios for all 101 distal tibia shaft fractures with articular involvement and 100 fractures with no articular involvement were not significantly different (p>0.05) using both coronal and sagittal plane measurements.

CONCLUSIONS: CT scans performed on distal third tibia shaft fractures in search of articular fractures had a low yield (23%). Widespread use of CT scan to diagnose fractures of the distal tibia articular surface in the setting of distal tibia shaft fractures does not appear warranted. We found no statistically significant differences in RIDEFAST ratios between fractures with and without articular involvement, indicating that more work is necessary before RIDEFAST can be used to reliably rule out articular involvement in this setting.

LEVEL OF EVIDENCE: Diagnostic Level III. See Instructions for Authors for a complete description of levels of evidence.

PMID:33840735 | DOI:10.1097/BOT.0000000000002135

Braz J Phys Ther. 2021 Mar 26:S1413-3555(21)00024-1. doi: 10.1016/j.bjpt.2021.03.001. Online ahead of print.

ABSTRACT

BACKGROUND: Neuromuscular electrical stimulation (NMES) is an important therapeutic tool for rehabilitation. However, best stimulation parameters remain to be determined.

OBJECTIVE: To determine the influence of different electrical stimulation currents and phase durations on torque, efficiency, and discomfort.

METHODS: Using a cross-over design, kHz frequency alternating currents (KFAC) and pulsed currents (PC) with narrow (200 µs) or wide (500 µs) phase durations were randomly applied on knee extensor muscles of healthy participants with a minimum of seven days between sessions. The NMES-evoked torque, NMES-efficiency, and discomfort (visual 0-10 cm analogue scale) were measured for each stimulation intensity increments (10 mA). Statistics were conducted using a three-way analysis of variances (phase duration x current x intensity), followed by Tukey post-hoc.

RESULTS: Twenty-four males (age 22.3 ± 3.5years) were included. No effect of NMES current was observed for torque, efficiency, and discomfort. For wide phase durations (500 µs), torque significantly increased for all stimulation intensities. For narrow phase durations (200 µs) evoked torque significantly increased only after 40% of maximal stimulation intensity. Phase durations of 500 µs produced greater torque than 200 µs. Discomfort was greater with 500 µs when compared to 200 µs. Submaximal relative torque, for example 40% of maximum voluntary contraction (MVC), was obtained with ∼ 60% and ∼ 80% of the maximal current intensity for 500 µs and 200 µs, respectively.

CONCLUSION: KFAC and PC current applied with the same phase duration induced similar relative submaximal and maximum evoked-torque, efficiency, and perceived discomfort. However, currents with 500 µs induced higher evoked-torque, current efficiency, and perceived discomfort.

PMID:33840592 | DOI:10.1016/j.bjpt.2021.03.001

Acad Radiol. 2021 Apr 8:S1076-6332(21)00103-3. doi: 10.1016/j.acra.2021.03.005. Online ahead of print.

ABSTRACT

RATIONALE AND OBJECTIVES: Celiac plexus and retrocrural splanchnic nerve (CP/RSN) blocks are widely used for cancer-related abdominal pain, but there is limited literature on their efficacy for non-cancer related pain. Our aim was to determine the indications and effectiveness of CT-guided CP/RSN blocks performed on patients with abdominal pain from non-cancer related sources.

MATERIALS AND METHODS: CT-guided CP/RSN blocks for non-cancer related abdominal pain from 2011-2020 were retrospectively reviewed for patient demographics, procedure details, duration of pain relief, and complications. Effective blocks were defined as patient-reported pain relief or decrease in opioid use lasting 2 or more days for temporary blocks and 14 or more days for permanent blocks.

RESULTS: Of 72 CT-guided CP/RSN blocks for non-cancer related abdominal pain, 48 (67%) were effective for a mean of 51 days (median 14, range 2-700). Of the 18 permanent blocks, 9 (50%) were effective for a mean of 111 days (median 90, range 14-390). Of the 54 temporary blocks, 39 (72%) were effective for a mean of 37 days (median 9, range 2-700). Indications included postural orthostatic tachycardia syndrome/dysautonomia (77% effective, 20/26), pancreatitis (86% effective, 12/14), postsurgical pain (62% effective, 8/13), median arcuate ligament syndrome (70% effective, 7/10), chronic pain syndrome (20% effective, 1/5), gastroparesis (80% effective, 4/5), and renal cystic disease (33% effective, 1/3). For postural orthostatic tachycardia syndrome /dysautonomia, pancreatitis, post-surgical pain, and MALS, there were no statistically significant differences in effectiveness between celiac vs. splanchnic blocks in groups matched by indication and intended duration (temporary/permanent).

CONCLUSIONS: CT-guided CP/RSN blocks can effectively manage non-cancer related abdominal pain, though there is discrepancy in efficacy between temporary and permanent blocks.

PMID:33840601 | DOI:10.1016/j.acra.2021.03.005

J Arthroplasty. 2021 Mar 18:S0883-5403(21)00285-0. doi: 10.1016/j.arth.2021.03.035. Online ahead of print.

ABSTRACT

BACKGROUND: Vancomycin is often used as antimicrobial prophylaxis in patients undergoing total hip or knee arthroplasty. Vancomycin requires longer infusion times to avoid associated side effects. We hypothesized that vancomycin infusion is often started too late and that delayed infusion may predispose patients to increased rates of surgical site infections and prosthetic joint infections.

METHODS: We reviewed clinical data for all primary total hip arthroplasty (THA) and total knee arthroplasty (TKA) patients at our institution between 2013 and 2020 who received intravenous vancomycin as primary perioperative gram-positive antibiotic prophylaxis. We calculated duration of infusion before incision or tourniquet inflation, with a cutoff of 30 minutes defining adequate administration. Patients were divided into two groups: 1) appropriate administration and 2) incomplete administration. Surgical factors and quality outcomes were compared between groups.

RESULTS: We reviewed 1047 primary THA and TKA patients (524 THAs and 523 TKAs). The indication for intravenous vancomycin usage was allergy (61%), methicillin-resistant staphylococcus aureus colonization (17%), both allergy and colonization (14%), and other (8%). 50.4% of patients began infusion >30 minutes preoperatively (group A), and 49.6% began infusion <30 minutes preoperatively (group B). Group B had significantly higher rates of readmissions for infectious causes (3.6 vs 1.3%, P = .017). This included a statistically significant increase in confirmed prosthetic joint infections (2.2% vs 0.6%, P = .023). Regression analysis confirmed <30 minutes of vancomycin infusion as an independent risk factor for PJI when controlling for comorbidities (OR 5.22, P = .012).

CONCLUSION: Late infusion of vancomycin is common and associated with increased rates of infectious causes for readmission and PJI. Preoperative protocols should be created to ensure appropriate vancomycin administration when indicated.

PMID:33840539 | DOI:10.1016/j.arth.2021.03.035

Foot Ankle Surg. 2021 Apr 1:S1268-7731(21)00077-1. doi: 10.1016/j.fas.2021.03.024. Online ahead of print.

ABSTRACT

BACKGROUND: The main goal of the surgical correction of the hallux valgus is the morphological correction associated with the functional rebalancing of the first ray. The aim of this triple-blinded, randomized controlled study was to show the efficacy of piezosurgery in performing distal linear osteotomy of the first metatarsal bone in HV correction, in terms of clinical and radiological outcomes at 1-year final follow up.

METHODS AND MATERIALS: This study was performed collecting prospectively pre-operative and post-operative data for all patients. 34 patients were included in the trial and were randomly allocated (1:1) in a Piezoelectric Group (PG) that involved the use of piezoelectric tools and in a Control Group (CG) that provided for the use of a traditional oscillating saw. In both groups, all patients were treated with a distal linear osteotomy of the first metatarsal bone. Clinical and radiographic assessments were performed.

RESULTS: The AOFAS score between the two groups was similar pre-operatively and during the follow-up period, with a slight superiority in the PG at each evaluation. The osteotomy surgical time was registered for both groups. Among the endpoints of the study, the radiological bone healing time was independently assessed by a radiologist that reported a lower mean value in the piezoelectric group compared with the control group.

CONCLUSIONS: This trial has shown that piezoelectric surgery is not inferior to traditional methods from the clinical-functional point of view, but can even lead to an evident reduction of bone healing time with a statistical significance.

LEVEL OF EVIDENCE: Level I.

PMID:33840570 | DOI:10.1016/j.fas.2021.03.024

Cont Lens Anterior Eye. 2021 Apr 8:101438. doi: 10.1016/j.clae.2021.03.005. Online ahead of print.

ABSTRACT

PURPOSE: To evaluate the ocular surface at the microstructural level of adults who habitually undertake indoor-suntanning utilising in vivo confocal microscopy.

METHODS: Participants were prospectively recruited and enrolled into either а study group (n = 75) with a history UV indoor tanning, or a control group (n = 75) with no prior history of artificial tanning. The study group participated in voluntary tanning sessions performed with standard equipment and maintained their usual routine for eye protection. Slit lamp biomicroscopy and in vivo confocal microscopy were performed at baseline before undertaking a series of suntanning sessions (10 sessions of 10 min duration over a 15 day period), within three days after the last session, and four weeks after the last session. Control group participants were examined at baseline and 8 weeks later and did not participate in tanning sessions.

RESULTS: All participants were female with a mean age of 25 ± 4 years and 24 ± 4 years in the study and control groups, respectively. No clinically significant changes were observed in either group over time using slit lamp biomicroscopy (all p ≥ 0.05), however, statistically significant differences were observed between the study and the control group for all corneal layers imaged using confocal microscopy (all p ≤ 0.03). Characteristic cystic conjunctival lesions with dark centres and bright borders were observed in 95% of the study group before and in 100% after the suntanning sessions.

CONCLUSION: Indoor suntanning resulted in statistically significant microstructural changes in the cornea and the bulbar conjunctiva that are undetectable with slit lamp biomicroscopy.

PMID:33840575 | DOI:10.1016/j.clae.2021.03.005

J Arthroplasty. 2021 Mar 11:S0883-5403(21)00263-1. doi: 10.1016/j.arth.2021.03.023. Online ahead of print.

ABSTRACT

BACKGROUND: The incidence of heterotopic ossification (HO) after total knee arthroplasty (TKA) varies and is of unclear clinical significance. This study aimed to identify the incidence of HO in patients undergoing revision TKA for either stiffness or aseptic loosening/instability and determine if the presence of HO is associated with inferior absolute range of motion (ROM) and ROM gains.

METHODS: Eighty-seven patients were prospectively enrolled and separated into 2 cohorts to evaluate ROM after revision TKA (2017-2019). Group 1 (N = 40) patients were revised for stiffness, while group 2 (N = 47) patients were revised for either aseptic loosening or instability. Goniometer-measured ROM values were obtained preoperatively and at 6 weeks, 6 months, and 1 year postoperatively. Statistical analysis included a Fisher’s exact test to assess for an association between preoperative HO and final ROM at 1 year after revision TKA.

RESULTS: HO was identified on preoperative radiographs in 17 patients (20%). There was a significantly higher rate of preoperative HO in patients revised for stiffness compared to patients revised for instability or loosening (30% vs 11%; P = .03). Five cases of HO qualitatively identified as most clinically severe were associated with lower ROM at each time point compared to the remainder of HO cases in this study cohort (P < .02).

CONCLUSION: The presence of HO is greater in patients undergoing revision TKA for stiffness. Additionally, HO severity appears to have a major effect on preoperative and postoperative ROM trajectory. This information should help guide patient expectations and highlight the need for a comprehensive, standardized classification system for HO.

PMID:33840538 | DOI:10.1016/j.arth.2021.03.023

Mayo Clin Proc. 2021 Apr 8:S0025-6196(21)00054-9. doi: 10.1016/j.mayocp.2020.12.035. Online ahead of print.

ABSTRACT

OBJECTIVE: To assess the risk of venous thromboembolism (VTE) in patients treated with Janus kinase (JAK) inhibitors in clinical trials.

PATIENTS AND METHODS: We performed a literature search of Ovid MEDLINE and ePub Ahead of Print, In-Process & Other Non-Indexed Citations, and Daily; Ovid EMBASE; Ovid Cochrane Central Register of Controlled Trials; Ovid Cochrane Database of Systematic Reviews; and Scopus, from inception to December 4, 2019, for randomized, placebo-controlled trials with JAK inhibitors as an intervention and reported adverse events. Odds ratio with 95% CI was calculated to estimate the VTE risk using a random effects model. Two independent reviewers screened and extracted data. The GRADE (Grading of Recommendations Assessment, Development and Evaluation) approach was used to assess certainty in estimated VTE risk.

RESULTS: We included 29 trials (13,910 patients). No statistically significant association was found between use of JAK inhibitors and risk of VTE (odds ratio, 0.91; 95% CI, 0.57 to 1.47; P=.70; I²=0; low certainty because of serious imprecision). Results using Bayesian analysis were consistent with those of the primary analysis. Results of stratified and meta-regression analyses suggested no interaction by dose of drug, indication for treatment, or length of follow-up.

CONCLUSION: We found insufficient evidence to support an increased risk of JAK inhibitor-associated VTE based on currently available data.

PMID:33840525 | DOI:10.1016/j.mayocp.2020.12.035

J Arthroplasty. 2021 Mar 19:S0883-5403(21)00287-4. doi: 10.1016/j.arth.2021.03.037. Online ahead of print.

ABSTRACT

BACKGROUND: The aim of the study was to investigate changes in patient-reported outcome measures (PROMs) after revision total knee arthroplasty (rTKA).

METHODS: A total of 10,727 patients undergoing elective rTKA were recruited from the UK National Health Service PROMs data set from 2013 to 2019. PROMs were collected at baseline and six months to assess joint function (Oxford Knee Score, OKS) and quality of life (EQ-5D). Associations with a change in the OKS (COKS) were investigated through multiple linear regression.

RESULTS: The mean COKS was 12.4 (standard deviation 10.7) points. A total of 6776 of 10,329 (65.6%) patients demonstrated increase in the OKS above the minimal important change of 7.5 points. The median change in the EQ-5D utility was 0.227 (interquartile range 0.000 to 0.554). A total of 4917 of 9279 (53.0%) patients achieved a composite endpoint of improvement greater than the minimal important change for joint function and ‘better’ QoL as per the Paretian analysis. A total of 7477 of 10,727 (69.7%) patients reported satisfaction with rTKA. A total of 7947 of 10,727 (74.1%) patients felt surgery was a success. A total of 4888 of 10,632 (46.0%) patients reported one or more adverse events. A higher preoperative OKS was associated with a lower COKS (coefficient -0.63 [95% confidence interval -0.67 to -0.60]). Other factors associated with a lower COKS were postoperative complication(s), age under 60 years, longer duration of knee problems, patients who identified as disabled, problems in EQ-5D dimensions of anxiety/depression and self-care, comorbid conditions (circulatory problems, diabetes, and depression), and earlier year of procedure in the data set.

CONCLUSION: Two-thirds of patients experienced a meaningful improvement in joint function after rTKA. However, there was a high frequency of patient-reported complications. These findings may enable better informed discussion of the risks and benefits of discretionary rTKA.

PMID:33840536 | DOI:10.1016/j.arth.2021.03.037

J Prosthet Dent. 2021 Apr 8:S0022-3913(21)00095-0. doi: 10.1016/j.prosdent.2021.02.013. Online ahead of print.

ABSTRACT

STATEMENT OF PROBLEM: Maxillary bone resorption after multiple extractions can jeopardize the success of an immediate denture, but whether bone volume preservation techniques are effective is unclear.

PURPOSE: The purpose of this randomized controlled trial was to evaluate the efficacy of socket grafting with a xenogenic bone substitute in participants receiving maxillary immediate removable complete dentures in terms of bone volume preservation (height and width of the bone ridge).

MATERIAL AND METHODS: The study was a single-blinded, randomized controlled clinical trial with 2 balanced parallel arms. Thirty-six participants who had Kennedy Class I edentulous posterior areas bilaterally for at least 3 months and required maxillary immediate removable complete dentures were enrolled. Duplicates of the removable complete denture were made and converted into radiographic and surgical guides. Participants allocated to the test group received deproteinized bovine bone mineral blended with 10% porcine collagen (DBBM-C) in the extraction sockets, and participants in the control group received no grafting material. With a radiographic guide in place, cone beam computed tomography scans were made 10 days after tooth extraction, when the immediate removable complete denture was delivered (D10, baseline), after 3 months (D90), and after 1 year (D365). The scans were superimposed, and measurements were made on the cross-sectional plane of each extraction site. The influence of various prognosis factors associated with bone volume preservation, including the location of tooth extraction, smoking habits, periodontal disease, and operator team, were analyzed.

RESULTS: Of 36 participants, 3 were lost to follow-up. The mean ±standard deviation loss of height of the buccal crest was 1.2 ±1.8 mm in the control group and 0.3 ±1.2 mm in the test group after 3 months of healing (P<.001) and 2.1 ±2.0 mm in the control group and 0.7 ±1.4 mm in the test group after 1 year of follow-up (P<.001). Mean ±standard deviation horizontal ridge width change was 1.3 ±1.4 mm in the control group and 0.5 ±0.8 mm in the test group after 3 months (P<.001) and 2.2 ±1.4 mm in the control group and 0.9 ±1.1 mm in the test group after 1 year of follow-up (P<.001). None of the other prognostic factors had a significant effect at either time period.

CONCLUSIONS: Grafting DBBM-C into the extraction socket after removing anterior teeth for immediate removable denture therapy resulted in significantly less vertical buccal crest and horizontal ridge resorption as compared with spontaneous socket healing after 1 year of follow-up. This procedure may be useful for preserving bone, especially when a fixed implant-supported prosthesis is planned.

PMID:33840514 | DOI:10.1016/j.prosdent.2021.02.013