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Orthopaedic Proceedings
Vol. 104-B, Issue SUPP_12 | Pages 73 - 73
1 Dec 2022
Woolfrey M Bolton C Woolfrey K Warchuk D
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Despite total knee arthroplasty demonstrating high levels of success, 20% of patients report dissatisfaction with their result.

Wellness Stasis Socks are embedded with a proprietary pattern of neuro-receptor activation points that have been proven to activate a precise neuro-response, as according to the pattern theory of haptic perception, which stimulates improvements in pain and function.

Technologies that manipulate this sensory environment, such as textured insoles, have proven to be effective in improving gait patterns in patients with knee osteoarthritis. In regard to patients undergoing TKA using this new technology may prove beneficial as an adjunct to recovery as many patients suffer from further deficits to their proprioceptive system caused by ligamentous damage and alterations to mechanoreceptors during procedure. We hypothesized that the Wellness Stasis Socks are a safe, cost-effective and easily scalable strategy to support TKA patients through their recovery.

Double-blinded, placebo-controlled randomized trial. Randomization using a computer-generated program . All study coordinators, healthcare personel and patients were blinded to patient groups. All surgical procedures were conducted by the same technique and orthopaedic surgeon. Intervention group: Wellness Stasis socks containing receptor point-activation technology. Control group: indentical appearing Wellness Stasis socks without receptor point-activation technology. Sock use during the waking hours . All additional post-operative protocols remained consistent between groups including same facility physiotherapy . Additional modalities (ice machines, soft-tissue massages, acupuncture) were prohibited. WOMAC questionnaire completed at baseline, 2 weeks, and 6 weeks to assess pain, stiffness and physical function. G*Power software to determine minimum sample of 50 in each group. No patients were lost to follow up and all followed study protocol. Data analysis using SPSS software. P-values, effect sizes, and confidence intervals are reported to assess clinical relevance of the finding. Physical status classifications were compared using t-test. Within-subject and between-subject differences in the mean WOMAC were analyzed by ANOVA.

Cramer's V statistical analysis noted that other variables of Sex, BMI, ASA classification and Age were not statistically different between the control and intervention groups.

No statistical difference between groups in Preop Womac scores.

The data showed a consistent improvement in Womac scores for pain and stiffness at 2 weeks post op in the interventional group over the control group.

The womac scores assessing physical function showed a consistent improvement at both 2 and 6 weeks post op in the intervention group compared to the control group.

There were no complications in either group associated the sock use.

The intervention proved to be a low cost and safe additional intervention post operatively from TKA to help patients improve with regard to pain, stiffness and physical function.

This study suggests this modality can be added to the list of other commonly used post op interventions such as cryocuffs, physiotherapy, and relaxation techniques as safe post op interventions to help patients improve post op TKA and can act as an adjunct in providing non narcotic pain control .


Orthopaedic Proceedings
Vol. 102-B, Issue SUPP_6 | Pages 121 - 121
1 Jul 2020
Bolton C Abuzaiter W Hallan A Cartledge S Warchuk D Woolfrey M
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Topically applied vancomycin powder has been used to decrease surgical site infection rates in spinal surgeries, however, randomized controlled trials in total joint arthroplasty are lacking. Application of vancomycin powder topically in the surgical site has theoretical benefit including high local concentration. In this study, we aimed to determine whether intra-operative topical antibiotics are safe and effective as IV antibiotics in preventing post-surgical site infections.

The trial was a randomized controlled, double blind, non-inferiority study. All patients received pre-operative IV antibiotics (cefazolin or vancomycin) within 60 minutes of skin incision. The controlled group received two doses of post-operative IV antibiotics (two grams cefazolin or one gram vancomycin if cefazolin allergy). In the treatment group, the orthopaedic surgeon applied one gram vancomycin powder (500mg applied directly on the prosthesis and 500mg applied above the closed joint capsule). The incidence of acute surgical site infection was defined as positive deep cultures within 42 days of procedure. All patients with evidence of infection underwent joint aspiration for culture.

After one year, 80 patients had received the topical vancomycin treatment and 85 patients had received the standard treatment. In the topical vancomycin group versus the controlled group, the average age was 64 vs 66, average BMI was 35.7 vs 33.4, number of males 33 vs 29, number of females 47 vs 56, and diabetic patients 16 vs 13. The number of infections in the topical vancomycin group was three vs zero in the post-operative IV antibiotic treatment group.

One Tailed Z-test P Value = 0.03. This study statistically demonstrated inferiority of topical vancomycin in comparison to the use of IV antibiotics post-operatively in preventing deep wound infections in TKA. The authors would caution against the sole use of intra-operative vancomycin in TKA to prevent post-operative infection.


Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_20 | Pages 60 - 60
1 Nov 2016
Woolfrey M Abuzaiter W Bolton C Weeratunga D Cartedge S
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Enhanced Recovery After Surgery (ERAS) is a multimodal perioperative care pathway designed to achieve early recovery for patients undergoing major surgery. ERAS allows for the incorporation of evidence based practices and incorporated a comprehensive assessment of the patient's journey through the surgical process from pre-operative screening through to post-operative care. The purpose of this study was to determine if optimisation of ERAS protocol with pre-operative screening and incorporating patient-specific factors into their post operative care would improve length of stay (LOS) and readmission rates following total joint arthroplasty (TJA) in a Canadian community hospital setting.

The study collected clinical, demographic data and the physical status perioperative using the American Society of Anaesthesiologists (ASA) classification on 508 patients who underwent TJA between January and August 2015 and compared similar data from the same time frame in the previous calendar year prior to implementation of the pathway. Cohorts were analysed for length of stay (LOS), readmission rates, Pre-operative assessments (completed by anaesthesia, nursing and pharmacy), relevant labs, patient history (surgery, medical, social), and patient values were all considered when developing a specific patient plan for care post-operatively. A post-operative management tool was used to optimise pain control, post-operative nausea and vomiting, bowel management, diabetes blood glucose control, venous thromboembolism prophylaxis, as well as monitoring parameters specific to patient medical history (e.g. respiratory, cardiac). While in hospital, physiotherapy and nursing were consulted by the pharmacist to assess whether patient's post op management needed to be altered to optimise mobilisation and recovery in hospital. The average patient's LOS and readmission rates in 30 days was analysed to assess the change after implementation of the post-operative management tool based on patient specific factors.

A total of 508 patients (mean age: 66 years), ASA classification was 3 or greater for 430 patients. The patients were assessed for LOS, readmission rates in 30 days. The mean LOS decreased from 3.6 to 3.3 days after optimisation of the ERAS protocol (student t test p=0.021). The 30-day readmission rate decreased from 2.9% to 1.4% post intervention (z test p=0.087) when compared to the same time period in the previous calendar year prior to protocol implementation. Overall, the cost savings to optimising the ERAS protocol for the hospital is substantial; with approximately $238 saved per patient.

Pre-operative screening and incorporating patient-specific factors into an individualised care plan to optimise the ERAS protocol for TJA reduced mean length of stay without a concomitant increase in readmission rates with significant cost saving.


Orthopaedic Proceedings
Vol. 84-B, Issue SUPP_III | Pages 277 - 277
1 Nov 2002
Valdivia G Dunbar M Parker D Woolfrey M McCalden R Rorabeck C Bourne R
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Introduction: The cement mantle is a critical factor in the longevity of cemented total hip arthroplasty (THA). Concern has been raised about the reliability of plain radiographs for its assessment. A new high-definition, three-dimensional (3-D), in vitro method of cement mantle evaluation has been developed.

Aim: To compare cement mantle quality in six contemporary stem designs.

Methods: Exact resin replicas of six contemporary stem designs were implanted into cadaver femora using third generation techniques. The specimens were imaged with a high-speed, helical, computerised, tomographic scanner. Computer-assisted, 3-D analysis of the cement mantle thickness was made. Comparisons were made between different stem designs and also with plain film assessments of the mantles.

Results: Standard radiographs overestimated mantle thickness (p< 0.05) and underestimated the deficiencies. The percentage area of cement mantle that was thinner than 2mm ranged from 9% to 28%. Slight malrotation or malalignment of the stem with respect to the broach envelope produced deficient mantles. Characteristic patterns of deficiencies were seen for different stem designs.

Conclusions: Plain x-rays overestimated the cement thickness, frequently missed areas of substandard cement, and should, therefore, be interpreted cautiously. The cement mantle varies widely depending on the stem design and surgical technique, and commonly used designs have significant deficiencies in their mantles by standard criteria despite proper surgical technique. Surgeons should be familiar with the stem that they use and its instrumentation to maximise outcomes. This is a valuable technique for the study of the cement mantle as it relates to implant design, surgical technique and patient anatomy.