Instant messaging application usage for clinical consultation among orthopedic surgery residents in Turkey: A survey study.

OBJECTIVE: This study aimed to determine the characteristics of instant messaging application (IMA) usage for clinical consultation among orthopedic residents in Turkey and to explore their experiences and opinions concerning potential legal problems. METHODS: A questionnaire titled "Instant messaging for consultation among orthopedic surgeons" consisting of 21 questions was applied to orthopedic surgery residents, and the results were analyzed. The questions were designed to obtain information on 4 categories: 1) demographics and professional experience, 2) attitudes on the use of cellular phones, 3) IMA usage for clinical consultation purposes, and 4) problems and comments on smartphone application usage for clinical consultation purposes. The participants who had no experience with a smartphone or IMA usage were excluded at the final analysis. RESULTS: A total of 860 orthopedic residents (849 males [98.7%]; mean age=28.6 years; age range=22-44 years) participated in the survey (participation rate: 97.3%). The distribution of residency years was as follows: 1st year, 27%; 2nd year, 21.4%; 3rd year, 18.4%; 4th year, 17.4%; and 5th year, 49.9%. The most frequently used IMAs were WhatsApp (99.3%), Facebook Messenger (14.8%), Viber (8%), and Tango (1.3%). The rate of IMA usage for consultation was 95.3%. The most common reasons to prefer IMAs for consultation were being "fast" and "easy," but only 26.3% of the residents reported that they prefer the use of IMAs because they find them "reliable." Moreover, 41.7% of the respondents reported that they had an experience of misdiagnosis owing to the use of IMAs; 81.2% of the participants used the personal information of the patients during the consultation; 57.6% of the respondents considered that legal problems may arise because of the use of IMAs during the consultation; and 51.4% believed that an electronic platform, solely for consultation purposes, is required. CONCLUSION: This survey has shown that it is necessary to make some legal regulations regarding the use of IMAs for consultation purposes and to develop applications only for medical consultation purposes. Most of the trainees make decisions using IMAs without a proper examination, putting the patients at the risk of misdiagnosis. Moreover, the confidentiality of the patient's personal information appears to be in danger when IMAs are used. LEVEL OF EVIDENCE: Level IV, Diagnostic Study.

A novel method to assess intraarticular screw penetration into the joint space.

OBJECTIVES: This study aims to propose a novel method to detect articular penetration of screws by relying on their electrical conductivity properties and control the validity of this method. MATERIALS AND METHODS: In this ex vivo study, conducted between June 2017 and August 2017, we used five fresh sheep shoulder joints. First, the shoulder joint space was filled with saline solution. An insulated cannula was placed in the joint capsule, and a conductive wire was introduced into the joint via this cannula. A single titanium screw was inserted from the tuberculum majus into the posteroinferior quadrant of the humeral head under fluoroscopic observation. Conductivity was continuously measured using a digital multimeter. When a sudden decrease in conduction resistance was detected, fluoroscopic images were obtained in the anteroposterior (AP) and lateral directions. These images were assessed for penetration by a blinded surgeon. Penetration was confirmed by dissection of the joint. RESULTS: There was a significant decrease in electrical resistance when screw penetration occurred (p<0.001). All penetration events were confirmed using our novel method. For all five of the specimens, either AP or lateral images could not be used to confirm penetration. For two of these specimens, penetration was undetectable in both AP and lateral fluoroscopic images, but a decrease in resistance was recorded. CONCLUSION: The described method exhibits greater sensitivity and accuracy for metal penetration to joint, and it is effective in detecting screws in the joints. The novel method described in this paper was applied in a prototype setting, and we believe that this concept can continue to be developed.

Periprosthetic joint infection with streptococcus dysgalactiae subspecies equisimilis: Case report.

Streptococcus dysgalactiae (SD) is a common pathogen among elderly population. However, to our knowledge, there is no periprosthetic joint infection case reported that is infected with Streptococcus dysgalactiae subspecies equisimilis (SDSE) in the English literature. In this article, we report a 77-year-old male patient who had undergone total knee arthroplasty three years ago and had the diagnosis of cellulitis at his leg followed by swelling, pain and hyperemia localized at his knee. Three knee aspirations were performed and the SDSE was identified. There was no direct contact of patient to animals.

The reliability of use of WhatsApp in type 1 and type 2 pediatric supracondylar fractures.

OBJECTIVES: This study aims to evaluate the reliability of the assessment of radiological X-ray images of traumatic injuries in the elbows of children using WhatsApp application, compared to true-size images on a Picture Archiving and Communication System (PACS) screen. PATIENTS AND METHODS: Between November 2017 and March 2018, X-ray images of a total of 90 pediatric patients (53 males, 37 females; mean age 6.2 years; range, 2 to 10 years) with an elbow injury were retrospectively evaluated. The images were captured and sent to three orthopedic surgeons via the WhatsApp instant messaging application on an iPhone 7S smartphone. Observers were asked to diagnose and classify for each case over their personal smartphones. The three observers independently assessed the images with a seven-day interval. Following one-week interval, revaluation was conducted using the PACS. Intra- and interobserver reliability were calculated by Cohen Kappa statistics. RESULTS: There was a good agreement between the first and second evaluations by the physicians via WhatsApp (k=0.74). The intraobserver reliability was very good (k=0.8), moderate (k=0.55), and good (k=0.67). There was no significant difference in the intra- and interobserver reliability between the groups. CONCLUSION: Using WhatsApp for consulting is a reliable method which can be used in the emergency setting for decision-making. Using WhatsApp can improve the efficacy of medical assessment and reduce waiting time in emergency admissions, although this method is not a substitution for evaluation of the images using computer-based PACS.

Transforming a U.S. scholarly concentrations program internationally: lessons learned.

BACKGROUND: Scholarly Concentrations programs in U.S. medical schools aim to instill passion for critical thinking and promote careers in academic medicine. The rise of these programs has seen variable goals, structure, and outcomes. Transformation of these programs internationally is in its infancy. METHODS: We describe implementation of the Johns Hopkins School of Medicine Scholarly Concentrations program, offering Basic Science, Clinical Science, Medical Ethics/Healing Arts, History of Medicine, and Public Health/Community Service, at Bezmiâlem Vakif University in Istanbul, Turkey. Over six modules in the preclinical years, students develop a faculty-mentored experience which encourages the acquisition of attitudes and skills for self-directed, lifelong learning and scholarship. This culminates in abstract and project presentation. We report program characteristics (context and logistics) and outcomes (student engagement and experiences). RESULTS: The Scholarly Concentrations program at Bezmiâlem began in 2014, with nearly two completed cohorts of students. In comparison to Johns Hopkins, students at Bezmiâlem begin at an earlier age (thus do not have as much prior research experience) and are subsequently evaluated for residency in terms of test scores rather than scholarship and publications, but have a similar level of intellectual curiosity and desire to take ownership of their project. Eighty-two percent of Bezmiâlem students stated the project they pursued was either their own idea or was an idea they formed after meeting with their mentor. Students at Bezmialem were more likely to choose Clinical Science projects (p = 0.009). Only 5% of Bezmiâlem students in end-of-course survey felt dissatisfied with the level of ownership they experienced with their project, a frequency similar to that seen by Johns Hopkins students (2%). CONCLUSIONS: Scholarly Concentrations programs play an important role in U.S. medical schools, and these programs can be successfully implemented internationally. The Scholarly Concentrations program at Johns Hopkins has been transformed to a program at Bezmiâlem in Istanbul, the first program outside North America or the European Union. When designing these programs, one must consider the context, logistics, student engagement, and outcomes. While long-term outcomes are needed, this can serve as a model for implementation elsewhere.

A meta-analysis comparing the direct anterior with other approaches in primary total hip arthroplasty.

BACKGROUND: Proponents of the direct anterior approach (DAA) for THAs suggest earlier recovery with no increased complications whereas opponents suggest higher complication rates. METHODS: We conducted a meta-analysis of randomized controlled trials (RCTs) to compare the outcomes of the DAA versus other surgical approaches in primary THAs. RESULTS: We identified 18 RCTs suitable for detailed extraction of the data. The RCTs included a total of 1661 patients with a mean age of 62 years (range 55-69). Using the DAA led to a significant improvement in the Harris Hip score by a mean of 5.6 points (95% confidence interval (CI) 4.3 to 6.8, p < 0.01, heterogeneity I2 18%) and the WOMAC score by a mean of -3.1 points (95% CI -4.1 to -2.1, p < 0.001, I2 0%) at 6 weeks postoperatively, reduction in the analgesic requirements on the day of surgery (Morphine Equivalents -3.6 95% CI -6.5 to -0.7, p = 0.02, I2 50%) and pain scores on day one postoperatively (VAS -1.3 95% CI -1.5 to -1.1, p < 0.01, I2 91%). DAA was associated with a smaller incision (-3.2 cm 95% CI -3.3 to -3.1, p < 0.01, I2 99%) and there was no significant difference in complication rates (P = 0.20) among the study groups. CONCLUSION: Based on the available studies, the DAA offers superior functional outcomes over other approaches in the immediate postoperative period after primary THA with no increased risk of complications. However, there was no evidence to support the superiority of any approach beyond 6 weeks postoperatively.

Analysis of Medical Responses in Mass Gatherings: The Commemoration Ceremonies for the 100th Anniversary of the Battle of Gallipoli.

IntroductionMass crowds outside the routine population create a burden of disease on Emergency Medical Services (EMS). The need for EMS in various mass-crowd events may vary. It is especially important to determine the EMS requirement that emerges during the historic commemoration ceremonies in Çanakkale (Turkey).Hypothesis/ProblemThis study aims to determine the unique challenges in the planning of EMS responses provided for people from various countries at the commemoration ceremony for a 100-year-old war and to identify the medical provision of those services. METHODS: This descriptive study examined the patient applications in the Çanakkale EMS at the commemoration ceremonies for the 100th anniversary of Gallipoli Wars (Çanakkale Amphibious Wars - Turkey) on April 24-25, 2015. RESULTS: A total of 221 cases were handled by 112 EMS in the ceremony area. Of those, 87.3% of the cases applied to a mobile operating room (MOR) stationed in the ceremony area while 12.7% of them applied directly to the health care team in a large area in the ceremony area. Overall, 13.1% of the cases were transferred to the hospital for further evaluation and treatment. Patient presentation rate (PPR) of the patients who were treated during the two days was 4.42, and transfer to hospital rate (TTHR) of the cases transferred to the hospital was calculated to be 0.58. CONCLUSION: Further studies may create models in regard to the estimations on mass and needs based on the data of previous organizations. KoçakH, ÇaliskanC, SönmezlerMS, EliuzK, KüçükdurmazF. Analysis of medical responses in mass gatherings: the commemoration ceremonies for the 100th anniversary of the Battle of Gallipoli. Prehosp Disaster Med. 2018;33(3):288-292.

Comparison of Cytotoxic Effects of Intra-Articular Use of Tranexamic Acid versus Epinephrine on Rat Cartilage.

BACKGROUND Adequate visualization is known to be essential to perform arthroscopic procedures effectively and efficiently. We hypothesized that tranexamic acid may be considered as an alternative agent to reduce intra-articular bleeding during arthroscopic procedures, after comparing its potential chondrotoxicity with that of epinephrine. MATERIAL AND METHODS Seventy-two rats were randomized into 3 groups with 24 rats each. The injections were performed in the right knees, as follows: Group 1: 0.25 mL of tranexamic acid solution, Group 2: 0.25 mL of epinephrine solution, and Group 3: 0.25 mL of 0.9% saline, serving as control. One week after the injections, the animals were euthanized. Samples were evaluated histologically based on the Osteoarthritis Research Society International (OARSI) Histopathology Grading and Staging System and the "live/dead" staining technique to determine chondrocyte viability. RESULTS Comparison of epinephrine and tranexamic acid revealed significantly higher OARSI scores in the epinephrine group (epinephrine: 3.42±1.31, TA: 0.92±0.90; P<0.001). The most significant difference between the 2 groups was in the number of joints diagnosed with OARSI grade III. The percentage of viability was significantly higher in the tranexamic acid group when compared with the epinephrine group (tranexamic acid: 79.74±3.343; epinephrine: 63.81±1.914; P<0.05). CONCLUSIONS Based on the histologic parameters and chondrocyte viability, tranexamic acid is less cytotoxic than epinephrine in rat chondrocytes at the doses typically used in irrigation fluid, and may be a good alternative to epinephrine in arthroscopic surgery.

The effect of platelet-rich plasma in bone-tendon integration.

BACKGROUND: The operative reconstruction of a torn or insufficient anterior cruciate ligament has become a routine surgical procedure in orthopedics. The long-term success of an anterior cruciate ligament reconstruction depends on the ability of the graft to heal adequately in a bone tunnel. Investigators studying reconstructions described healing within a tunnel as osseous ingrowth and incorporation. In particular, helping the healing using autologous material for the best integration process was a new idea that helped us to set up this study. OBJECTIVES: The purpose of this study is to show the effect of platelet-rich plasma on bone-tendon healing. MATERIAL AND METHODS: Ten New Zealand rabbits were used. The study had 2 groups: (1) a study group including the right extremities of rabbits in which tendon-bone integration was strengthened by plateletrich plasma and (2) a control group including the left extremities of rabbits in which tendon-bone integration was without platelet-rich plasma. On the 56th day postoperatively, the portion of the distal femur containing the tunnel was amputated following the euthanization process for histological evaluation. RESULTS: In the histological evaluation of the tendon-integrated bone segments with platelet-rich plasma, the integration of tendon in the bone was successful without any necrosis formation in most of the tissues. However, in the control group without platelet-rich plasma, the integration was distorted in many zones and some cystic morphologies were present. CONCLUSIONS: The findings of this study showed that using platelet-rich plasma during tendon-to-bone implantation has positive effects histologically. In the literature, many studies are available that have investigated the effect of platelet-rich plasma on anterior cruciate surgery radiologically. However, the histological findings are more reliable than radiological findings because bone-tendon integration is a biological process.

Tips and tricks for using the internet for professional purposes.

Online resources provide access to large amounts of information which is expanding every day. Using search engines for reaching the relevant, updated and complete literature that is indexed in various bibliographical databases has already become part of the medical professionals' everyday life.However, most researchers often fail to conduct a efficient literature search on the internet. The right techniques in literature search save time and improve the quality of the retrieved data.Efficient literature search is not a talent but a learnable skill, which should be a formal part of medical education.This review briefly outlines the commonly used bibliographic databases, namely Pubmed, Cochrane Library, Web of Science, Scopus, EMBASE, CINAHL and Google Scholar. Also the definition of grey literature and its features are summarised. Cite this article: EFORT Open Rev 2017;2. DOI: 10.1302/2058-5241.2.160066. Originally published online at www.efortopenreviews.org.

The Incidence and Economic Burden of In-Hospital Venous Thromboembolism in the United States.

BACKGROUND: Venous thromboembolism (VTE) is a potentially preventable and costly complication after total hip arthroplasty (THA) and total knee arthroplasty (TKA). The in-hospital incidence and economic burden of VTE following total joint arthroplasty (TJA) in the United States is unknown. The aim of this study was to examine this issue. METHODS: The Nationwide Inpatient Sample was used to estimate the total number of THA, TKA, and VTE events using International Classification of Diseases, Ninth Revision procedure codes from years 2002 to 2011. The rate of in-hospital deep vein thrombosis (DVT) and pulmonary embolism (PE), associated length of hospitalization, and current and projected in-hospital charges were obtained. RESULTS: Revision arthroplasties had higher rates of in-hospital VTE compared to primary TJAs (2.5% vs 1.6%, P < .0001). Among primary TJAs, the median rate of in-hospital VTE was 0.59% (0.55%-0.63%) for primary THA and 1.01% (0.94%-1.08%) for primary TKA. Revision THAs developed more VTE events compared to revision TKAs (1.35% [1.25%-1.46%] vs 1.16% [1.07%-1.26%]). Patients with a VTE have longer hospitalizations (median primary TKA: 7 vs 3; median primary THA: 6 vs 3, P < .0001). The overall rate of VTE decreased over the last decade; however, the PE rates have remained relatively constant. Moreover, the associated costs with VTE events have increased significantly over the last decade. CONCLUSION: Based on the analysis of the Nationwide Inpatient Sample database, the rate of in-hospital DVT following TJA appears to have declined over the last decade while the incidence of PE has remained constant. This may indicate that the current recommendations by the American Academy of Orthopaedic Surgeons for VTE prophylaxis are adequate for preventing DVT without increasing the rate of PE or that institutional screening and reporting of DVT has been reduced because DVTs became a "never" event.

A novel intramedullary nail for use in the treatment of supramalleolar malunion and nonunion: A preliminary report of three cases.

INTRODUCTION: The fractures around the supramalleolar region are difficult to manage and deformities may occur following insufficient or inadequate treatment attempts. The treatment of those deformities is even more challenging. The available options for surgical fixation have inherent problems considering the soft tissue problems, infection and compliance of the patients. In this study, we report the preliminary outcome of new IMN system in use of supramalleolar deformities. PATIENTS AND METHODS: Three patients with supramalleolar deformities were recruited for this study. Two patients had periarticular distal tibia malunions and one patient had nonunion in same region. All patients were operated with using newly designed intramedullary nail system with a unique distal interlocking bolt screw. The outcome for each patient was followed-up and evaluated with using AOFAS score. RESULTS: The patients were followed up for 3 years, 3 months, and 6 months, respectively. The AOFAS scores were 36, 33, and 21 preoperatively; and 75, 68, and 75 postoperatively in Patients 1, 2 and 3, respectively. CONCLUSION: In our patient series, adequate fixation following correction of the deformity was seen. Although the number of the cases are limited this study provides encouraging results regarding the outcome of new IMN system in use of supramalleolar deformities.

Particle Disease: A Current Review of the Biological Mechanisms in Periprosthetic Osteolysis After Hip Arthroplasty.

BACKGROUND: Inflammatory responses to wear debris cause osteolysis that leads to aseptic prosthesis loosening and hip arthroplasty failure. Although osteolysis is usually associated with aseptic loosening, it is rarely seen around stable implants. Aseptic implant loosening is a simple radiologic phenomenon, but a complex immunological process. Particulate debris produced by implants most commonly causes osteolysis, and this is called particle-associated periprosthetic osteolysis (PPO). OBJECTIVE: The objective of this review is to outline the features of particle-associated periprosthetic osteolysis to allow the physician to recognise this condition and commence early treatment, thereby optimizing patient outcome. METHODS: A thorough literature search was performed using available databases, including Pubmed, to cover important research published covering particle-associated PPO. RESULTS: Although osteolysis causes bone resorption, clinical, animal, and in vitro studies of particle bioreactivity suggest that particle-associated PPO represents the culmination of several biological reactions of many cell types, rather than being caused solely by the osteoclasts. The biological activity is highly dependent on the characteristics and quantity of the wear particles. CONCLUSION: Despite advances in total hip arthroplasty (THA), particle-associated PPO and aseptic loosening continue to be major factors that affect prosthetic joint longevity. Biomarkers could be exploited as easy and objective diagnostic and prognostic targets that would enable testing for osteolysis after THA. Further research is needed to identify new biomarkers in PPO. A comprehensive understanding of the underlying biological mechanisms is crucial for developing new therapeutic interventions to reverse or suppress biological responses to wear particles.

Single vs Repeat Surgical Skin Preparations for Reducing Surgical Site Infection After Total Joint Arthroplasty: A Prospective, Randomized, Double-Blinded Study.

BACKGROUND: Preventing surgical site infection (SSI) after total joint arthroplasty (TJA) is a high priority and is partly linked to the efficacy of surgical site preparation solutions (SPSs) in reducing the number of pathogens on the skin before incision. The aim of this study is to investigate the effectiveness of SRS reapplication after draping to reduce the incidence of SSI after TJA. METHODS: Six hundred patients undergoing primary TJA between 2010 and 2011 at a single institution were recruited and randomly assigned to one of 2 groups. The patients in the intervention group (n = 300) received SPS that included alcohol and povidone-iodine before draping and an additional SPS by iodine povacrylex and isopropyl alcohol before application of the final adhesive drape, whereas the patients in the control group (n = 300) received a single SPS with alcohol and povidone-iodine before draping. Randomization was performed by an opaque envelope, and the rates of SSI and blistering were compared between groups. RESULTS: Five seventy-seven patients completed the study and were included in the final analysis. There was a significant reduction in the incidence of superficial SSI for the intervention group (1.8%, 5 of 283) compared to the control group (6.5%, 19 of 294, P = .02). There were 2 (0.7%, 2 of 294) deep incisional SSIs in the control group, and 2 (0.7%, 2 of 283) organ-space SSIs in the intervention group (P = 1.00). In addition, skin blistering was lower in the intervention group (3.5%, 10 of 283) vs the control group (6.5%, 19 of 294), but this difference also did not reach statistical significance (P = .13). CONCLUSION: Reapplication of an SPS after draping and before the application of iodophor-impregnated incisive draping resulted in a significant reduction in the rate of SSI in patients undergoing elective TJA.

The Prevention of Periprosthetic Joint Infections.

Periprosthetic joint infection (PJI) following total joint arthroplasty (TJA) adversely affects patient quality of life and health status, and places a huge financial burden on the health care. The first step in combating this complication is prevention, which may include implementation of strategies during the preoperative, intraoperative, or postoperative period. Optimization of the patient with appreciation of the modifiable and non-modifiable factors is crucial. Preoperative optimization involves medical optimization of patients with comorbidities such as diabetes, anemia, malnutrition and other conditions that may predispose the patient to PJI. Among the intraoperative strategies, administration of appropriate and timely antibiotics, blood conservation, gentle soft tissue handling, and expeditious surgery in an ultra clean operating room are among the most effective strategies. During the postoperative period, all efforts should be made to minimize ingress or proliferation of bacteria at the site of the index arthroplasty from draining the wound and hematoma formation. Although the important role of some preventative measures is known, further research is needed to evaluate the role of unproven measures that are currently employed and to devise further strategies for prevention of this feared complication.

Anthropometric measurements of tibial plateau and correlation with the current tibial implants.

PURPOSE: The aim of the study was to make an anthropometric analysis at the resected surfaces of the proximal tibia in the Turkish population and to compare the data with the dimensions of tibial components in current use. We hypothesized that tibial components currently available on the market do not fulfil the requirements of this population and a new tibial component design may be required, especially for female patients with small stature. METHODS: Anthropometric data from the proximal tibia of 226 knees in 226 Turkish subjects were measured using magnetic resonance imaging. We measured the mediolateral, middle anteroposterior, medial and lateral anteroposterior dimensions and the aspect ratio of the resected proximal tibial surface. All morphological data were compared with the dimensions of five contemporary tibial implants, including asymmetric and symmetric design types. RESULTS: The dimensions of the tibial plateau of Turkish knees demonstrated significant differences according to gender (P < 0.05). Among the different tibial implants reviewed, neither asymmetric nor symmetric designs exhibited a perfect conformity to proximal tibial morphology in size and shape. The vast majority of tibial implants involved in this study tend to overhang anteroposteriorly, and a statistically significant number of women (21 %, P < 0.05) had tibial anteroposterior diameters smaller than the smallest available tibial component. CONCLUSION: Tibial components designed according to anthropometric measurements of Western populations do not perfectly meet the requirements of Turkish population. These data could provide the basis for designing the optimal and smaller tibial component for this population, especially for women, is required for best fit. LEVEL OF EVIDENCE: II.

Effect of body mass index on functional outcomes following arthroplasty procedures.

AIM: To evaluate the body mass index (BMI) change in arthroplasty patients and its impact on the patients' functional results. METHODS: Between October 2010 and May 2013, 606 patients who were operated due to gonarthrosis, coxarthrosis, aseptic loosening of the total knee and hip prosthesis were evaluated prospectively. Patients were operated by three surgeons in three medical centers. Patients who were between 30-90 years of age and who were underwent total knee arthroplasty, total hip arthroplasty, revision knee arthroplasty, or revision hip arthroplasty were included in the study. We excluded the patients who cannot tolerate our standard postoperative rehabilitation program. Additionally, patients who had systemic inflammatory diseases, diabetes mellitus, or endochrinopathies were excluded from the study. The remaining 513 patients comprised our study group. Preoperative functional joint scores, height, weight and BMI of all patients were recorded. We used the Knee Society Score (KSS) for knee and Harris Hip Score (HHS) for hip patients. Postoperative functional scores were measured at 1(st), 6(th) and 12(th) months and recorded separately at outpatient visits. RESULTS: The mean age of the patients was 64.7 (range: 30-90) years (207 males/306 females) and the mean follow-up duration was 14.3 (range: 12-26) mo. We found that arthroplasty patients had weight gain and had an increase in BMI at the postoperative 1(st), 6(th) and 12(th) months. The mean BMI of the patients was 27.7 preoperatively, 27.8 at the postoperative 1(st) month, 28.1 at the 6(th) month and 28.6 at the 12(th) month (P < 0.01). At the last visit, the mean postoperative HHS of the hip arthroplasty patients was 82.2 ± 7.12 (preoperatively, 52.3; 1(st) month, 78.2; 6(th) month, 81.1; 12(th) month, 82.2), and the mean KSS of the knee arthroplasty patients was 79.3 ± 4.31 (preoperatively, 35.8; 1(st) month, 75.2; 6(th) month, 79.1; 12(th) month, 79.3). Worse functional results were noted in the patients who had a BMI increase, however, this correlation was statistically significant only at the postoperative 6(th) month (P = 0.03). CONCLUSION: To prevent the negative functional effects of this weight gain during the postoperative period, arthroplasty patients should be advised for weight control and risky patients should consult with a dietician.

Do Standard Surgical Guides Produce Accurate and Precise Femoral Bone Resections During Total Knee Arthroplasty?

PURPOSE: Accurate alignment and balanced flexion and extension gaps are critical elements in achieving a successful outcome following total knee arthroplasty (TKA). The ability to make accurate and precise bone cuts is essential in the creation of balanced gaps. We sought to determine if one type of modern-day standard surgical instrument using an intramedullary rod and posterior referencing produces accurate and precise distal and posterior femoral bone resections. MATERIALS AND METHODS: Seventy-five consecutive patients undergoing TKA were divided into three groups, with 25 patients in each group receiving one of three implant designs: 25 Stryker Triathlon® CR (Stryker, Mahwah, NJ), 25 Zimmer NexGen® Flex CR (Zimmer, Warsaw, IN), and 25 StelKast Proven Gen-FlexTM CR (StelKast, Pittsburgh, PA). Flexion-extension gap matching was determined using only the medial flexion and extension gaps. Accuracy was determined by comparing actual resection thickness to desired resection thickness. "Optimal" accuracy was considered to be within 1.0mm of desired, and "near-optimal" accuracy was considered to be within 2.0mm of the desired resection thickness. Precision was determined by the variability of resection thicknesses within each system. RESULTS: Data demonstrated a lack of accuracy and precision across all three tested systems, with each system resulting in certain unique tendencies. Only one out of 75 cases resulted in optimal resection accuracy with all three cuts (Zimmer). When lowering the threshold to include both optimal and near-optimal (within 2 mm of error) with all three cuts, only one third of Stryker and Zimmer cases and two thirds of StelKast cases achieved this threshold, representing 44% of cases (33/75). CONCLUSIONS: Improvements in instrumentation to increase accuracy and precision may be warranted. Errors in fixation may be due to the instrumentation itself, and altering instrumentation to include less modularity, provide more stable fixation, and more reliably seal the implant on the femur may be of benefit.