Preoperative Risk Factors for, and Incidence of Delayed Surgery in Elective Primary Total Knee Arthroplasty After Hospital Admission: The ACS-NSQIP.

BACKGROUND: Approximately 600,000 total knee arthroplasties (TKA) are performed every year in the United States and the number of procedures has increased substantially every year. These demands may further strain the government, insurers, and patients struggling with increasing healthcare spending. A delay in proceeding to surgery after hospital admission may affect the overall healthcare costs. To our knowledge, the current literature has not addressed the incidence of, and preoperative risk factors for, a surgical delay in TKA. METHODS: The ACS-NSQIP 2011 database was reviewed to identify patients undergoing elective primary total knee arthroplasty (TKA) using the Current Procedural Terminology (CPT) code 27447. 14,881 cases were no delay in proceeding to surgery after hospital admission while 139 cases were delayed for TKA. Risk factors or comorbidities contributing to surgical delay in TKA were identified. A univariate analysis of all patient parameters was conducted to measure the difference between the two cohorts. Finally, a multivariate logistic regression analysis was then conducted to identify risk factors or comorbidities for surgical delay. RESULTS: There were 139 cases of surgical delay in TKA (0.93%). Congestive heart failure (P = 0.017), bleeding disorder (P <0.0001), sepsis (P <0.0001), a prior operation in the past 30 days (P <0.0001), dependent functional status (P <0.0001), ASA class 3 (P = 0.046), and hematocrit <38% (P <0.0001) were independent risk factors for a surgical delay. Postoperative medical complication (2.2% vs 0.8%, P < 0.0001) in surgical delay was significantly higher than non-delayed cohort. CONCLUSION: The optimization of preoperative modifiable risk factors appears to be one of the best strategies to reduce delayed surgery and therefore costs in TKA.

Stress fractures in the elderly: different pathogenetic features compared with young patients.

Stress fractures mainly occur in the lower limb as a result of cyclic submaximal stresses. Most commonly affected by this specific type of fractures are young athletes, military or elderly subjects with metabolic bone diseases like osteoporosis. In consideration of the heterogeneity of affected patients is presumable that there are different pathogenic mechanisms. In young person bone tissue, although metabolically intact, is not able to withstand the stresses to which it is chronically subjected, also because of muscle fatigue. This leads to a macrostructural failure and to the development of "fatigue" fractures. Instead, in elderly patients, there are numerous physiological conditions that determine a bone metabolism alteration. This is the main reason for the structural changes in trabecular and cortical bone, which is reflected in reduced biomechanical strength. In addition, muscular situation, such as muscle fiber atrophy, is unable to correctly support bone tissue, leading to the development of insufficiency fractures.

Free-style perforator flaps in the reconstruction of the lower limb.

INTRODUCTION: The evolving concept of free-style flaps with one or more perforators able to lend support, has been shown to have noteworthy advantages in the context of reconstructive surgery, especially in relation to the distal portion of the lower limb. Among the advantages, an analogy of the covering tissues with pre-existing ones in the compromised area, reduced morbidity of the donor site, less time spent in theatre and a greater flexibility from the surgeons' point of view. MATERIAL AND METHODS: Between 2009 and 2012, 18 patients were treated with local free-style flaps for lesions involving the leg and the foot. The median age of the patients, (11 men and 7 women) was 63.2 years. Subsequently, the patients were followed up for 6 months-1 year. RESULTS: In the period following surgery all the free style flaps have survived completely; further surgery has not been warranted. Healing of the donor sites took place by primary intention in 17 cases; in one case, a V-Y advancement flap adapted as a cover for a loss of substance of the calcaneus, it occurred by secondary intention. DISCUSSION AND CONCLUSIONS: Lower limb reconstruction, in virtue of the fact that adjacent tissues for reconstruction are scarce and vascularization is an issue, has always constituted a problem which has not been easy to solve for the surgeon. The application of the free-style concept to loco-regional flaps has yielded satisfactory results in our experience, from both a functional as well as an aesthetic point of view.