Prevalence of modifiable surgical site infection risk factors in hip and knee joint arthroplasty patients at an urban academic hospital.

Surgical site infections after hip and knee arthroplasty can be devastating if they lead to periprosthetic joint infection. We examined the prevalence of the modifiable risk factors for surgical site infection described by the American Academy of Orthopaedic Surgery Patient Safety Committee. Our study of 300 cases revealed that only 20% of all cases and 7% of revision cases for infection had no modifiable risk factors. The most common risk factors were obesity (46%), anemia (29%), malnutrition (26%), and diabetes (20%). Cases with obesity or diabetes were associated with all histories of remote orthopedic infection, 89% of urinary tract infections, and 72% of anemia cases. The high prevalence of several modifiable risk factors demonstrates that there are multiple opportunities for perioperative optimization of such comorbidities.

External iliac artery thrombosis after open reduction of an acetabular fracture: a case report.

Major arterial injury from open reduction and internal fixation of an acetabular fracture through an ilioinguinal approach is rare. Detection of a major intraoperative arterial injury is simple. Detection of a more occult injury leading to thrombosis is not. We report the third known case of thrombosis of the external iliac artery following open reduction and internal fixation of an anterior column fracture. This case is of particular interest because it highlights the ability of young patients to compensate for major vessel occlusion and still maintain a well-perfused foot. Heightened awareness of subtle side-to-side differences in pulses postoperatively may reveal that occult injury is a more common occurrence than previously appreciated.

Early ambulation after hip fracture: effects on function and mortality.

BACKGROUND: Few studies have examined the relationship between inpatient bed rest and functional outcomes. We examined how immobility is associated with function and mortality in patients with hip fracture. METHODS: We conducted a prospective cohort study of 532 patients 50 years and older, who were treated with surgery after hip fracture in 4 hospitals in New York. We collected information from hospital visits, medical records, and interviews. "Days of immobility" was defined as days until the patient moved out of bed beyond a chair. Follow-up was obtained on function (using the Functional Independence Measure) at 2 and 6 months and on survival at 6 months. RESULTS: Patients with hip fracture experienced an average of 5.2 days of immobility. Compared with patients with a longer duration of immobility (ie, at the 90th percentile) in adjusted analyses, patients at the 10th percentile of immobility had lower 6-month mortality (-5.4%; 95% confidence interval [CI], -10.9% to -1.0%) and better Functional Independence Measure score for locomotion (0.99 points; 95% CI, 0.3 to 1.7 points, with higher values indicating better function), but there was no significant difference in locomotion by 6 months (0.58 points; 95% CI, -0.3 to 1.4 points). The adverse association of immobility was strongest in patients using personal assistance or supervision with locomotion at baseline (difference in 6-month mortality between the 90th and 10th percentile of immobility was -17.1% [P = .004] for this group and only 1.2% [P = .38] for patients independent in locomotion at baseline). CONCLUSION: In patients with hip fracture, delay in getting the patient out of bed is associated with poor function at 2 months and worsened 6-month survival.

Heal rate of metatarsal fractures: A propensity-matching study of patients treated with low-intensity pulsed ultrasound (LIPUS) vs. surgical and other treatments.

INTRODUCTION: Whether to treat metatarsal fractures conservatively or surgically is controversial. We test a hypothesis that metatarsal fractures treated conservatively with non-invasive low-intensity pulsed ultrasound (LIPUS) obtain heal rates comparable to current surgical techniques. PATIENTS AND METHODS: This is a retrospective observational cohort study, using patient outcomes from a prospectively-collected LIPUS registry required by the U.S. Food & Drug Administration. Registry data were collected over a 5-year period and were reviewed and validated by a registered nurse. Data required for analysis were days-to-treatment (DTT) with LIPUS and a dichotomous outcome of healed versus failed, as assessed by clinical and radiographic criteria. Registry patients (DTT<365days) were propensity-matched to metatarsal fracture patients from a health claims database that includes medical and drug expenses for ∼90.1 million patients. The propensity match was based on patient demographic data (age, gender, body weight, fracture severity, and smoking status). RESULTS: A total of 594 metatarsal fractures were treated with LIPUS, including 161 Jones fractures. Compared to patients in the claims database, LIPUS-treated patients were more likely to: be overweight or obese; be male; have open fracture; and smoke (all, P<0.0001), suggesting that these variables were perceived as nonunion risk factors by prescribing physicians. After propensity-matching, none of these differences between the registry and the health claims database remained significant. The heal rate with LIPUS treatment was 97.3%, comparable to the heal rate of 95.3% among claims patients in 2011 who did not receive LIPUS (P=0.0654). When fresh fractures (0-90days) and delayed unions (91-365days) were analyzed separately, the LIPUS fresh fracture heal rate was superior to claims patients (P=0.0381), and the delayed union heal rate was comparable. After exclusion of registry patients who received surgery, heal rate with LIPUS alone (97.4%) was significantly better (P<0.0097) than the heal rate for matched patients in 2011 (94.2%). CONCLUSIONS: LIPUS significantly improved the heal rate of metatarsal fractures <1year old without surgery (P=0.0097). Metatarsal fractures treated with LIPUS alone have a heal rate comparable to fractures treated by surgical intervention.

Patients with hip fracture: subgroups and their outcomes.

OBJECTIVES: To present several alternative approaches to describing the range and functional outcomes of patients with hip fracture. DESIGN: Prospective study with concurrent medical records data collection and patient and proxy interviews at the time of hospitalization and 6 months later. SETTING: Four hospitals in the New York metropolitan area. PARTICIPANTS: Five hundred seventy-one hospitalized adults aged 50 and older with hip fracture between July 1997 and August 1998. MEASUREMENTS: Rates of return to function in four physical domains, mortality, and nursing home residence at 6 months. Cluster analysis was used to describe the heterogeneity among the sample and identify variations in 6-month mortality, nursing home residence, and level of functioning and to develop a patient classification tree with associated patient outcomes at 6 months postfracture. RESULTS: In locomotion, transfers, and self-care, 33% to 37% of patients returned to their prior level of function by 6 months, including those needing assistance, but only 24% were independent in locomotion at 6 months. Cluster analysis identified eight patient subgroups that had distinct baseline features and variable outcomes at 6 months. The patient classification tree used four variables: atypical functional status (independent in locomotion but dependent in other domains); nursing home residence; independence/dependence in self-care; and age younger than 85 or 85 and older that identified five subgroups with variable 6-month outcomes that clinicians may use to predict likely outcomes for their patients. CONCLUSION: Patients with hip fracture are heterogeneous with respect to baseline and outcome characteristics. Clinicians may be better able to give patients and caregivers information on expected outcomes based on presenting characteristics used in the classification tree.

Hospital readmissions after hospital discharge for hip fracture: surgical and nonsurgical causes and effect on outcomes.

OBJECTIVES: To examine the causes of hospital readmission after hip fracture and the relationships between hospital readmission and 6-month physical function and mortality. DESIGN: Prospective, multisite, observational cohort study. SETTING: Four hospitals in the New York City metropolitan area. PARTICIPANTS: Five hundred sixty-two patients hospitalized for hip fracture aged 50 and older and discharged alive in 1997-1998. MEASUREMENTS: Patient demographic characteristics, type of fracture and repair, comorbid conditions, postoperative complications, do not resuscitate status, and active clinical problems at the time of hospital discharge. Prefracture and 6-month mobility were measured using the Functional Independence Measure. Hospital readmissions and International Classification of Diseases, Ninth Revision principal diagnoses were ascertained from hospital admission/discharge databases, the New York Statewide Planning and Research Cooperative System, medical record review, and patient self-report. RESULTS: Eighty-two percent of participants were women, and 93% were white. Within 6 months after hospital discharge, 178 (32%) patients were readmitted to the hospital, with 45 (8%) readmitted more than once. Forty-seven of 233 readmissions (20%) occurred within the first 2 weeks after discharge, and 80 (34%) occurred within 4 weeks. Over 6 months, 89% of readmissions were for nonsurgical problems, of which infectious (21%) and cardiac (12%) diseases were the most common. In multivariate analyses, patients who were readmitted were more likely to require total assistance with ambulation at 6 months (odds ratio (OR) = 2.7, 95% confidence interval (CI) = 1.6-4.6) and to die (OR = 4.0, 95% CI = 2.2-7.3) than those not readmitted. CONCLUSION: Hospital readmissions after hip fracture are largely due to nonsurgical illness and are associated with increased morbidity and mortality.

Relationship between pain and opioid analgesics on the development of delirium following hip fracture.

BACKGROUND: Delirium and pain are common following hip fracture. Untreated pain has been shown to increase the risk of delirium in older adults undergoing elective surgery. This study was performed to examine the relationship among pain, analgesics, and other factors on delirium in hip fracture patients. METHODS: We conducted a prospective cohort study at four New York hospitals that enrolled 541 patients with hip fracture and without delirium. Delirium was identified prospectively by patient interview supplemented by medical record review. Multiple logistic regression was used to identify risk factors. RESULTS: Eighty-seven of 541 patients (16%) became delirious. Among all subjects, risk factors for delirium were cognitive impairment (relative risk, or RR, 3.6; 95% confidence interval, or CI, 1.8-7.2), abnormal blood pressure (RR 2.3, 95% CI 1.2-4.7), and heart failure (RR 2.9, 95% CI 1.6-5.3). Patients who received less than 10 mg of parenteral morphine sulfate equivalents per day were more likely to develop delirium than patients who received more analgesia (RR 5.4, 95% CI 2.4-12.3). Patients who received meperidine were at increased risk of developing delirium as compared with patients who received other opioid analgesics (RR 2.4, 95% CI 1.3-4.5). In cognitively intact patients, severe pain significantly increased the risk of delirium (RR 9.0, 95% CI 1.8-45.2). CONCLUSIONS: Using admission data, clinicians can identify patients at high risk for delirium following hip fracture. Avoiding opioids or using very low doses of opioids increased the risk of delirium. Cognitively intact patients with undertreated pain were nine times more likely to develop delirium than patients whose pain was adequately treated. Undertreated pain and inadequate analgesia appear to be risk factors for delirium in frail older adults.

Surgical management of chronic osteomyelitis.

Chronic osteomyelitis is a surgical disease that can require significant dedication from both patients and surgeons to eradicate. Osteomyelitis can result from a variety of etiologies but most often is a consequence of trauma to a long bone, frequently the tibia. It is important to understand the etiology of the infection, as well as the pathophysiology of its chronicity. Additionally, the surgeon must individualize treatment for each patient, because host morbidities often play an important role in propagation of infection. Treatment requires isolation of the pathogens, significant debridement for removal of all infective and necrotic material, and then bony and soft tissue reconstruction. We review the literature of surgical treatment of chronic osteomyelitis and discuss the numerous techniques available to the treatment team, including debridement, dead space management, Ilizarov techniques, and vascularized reconstruction. These patients often require a multimodality approach that incorporates a team approach involving orthopedic and plastic surgery, as well as infectious disease and general medicine.

Primary total knee arthroplasty for complex distal femur fractures in elderly patients.

Fractures of the distal femur in the geriatric population are associated with a high incidence of postoperative complications and poor results. Nonunion, loss of fixation, and malunion of these fractures occur with all types of treatment. The postoperative treatment of these patients demands a lengthy period of limited weightbearing that can increase the rate of medical complications. Our experience with these challenging fractures caused us to consider the use of a primary distal femur replacement total knee arthroplasty with the goals of elimination of fracture healing issues, early mobilization, and immediate weightbearing. Twenty-four distal femoral replacement knee arthroplasties were done from July 1998 to January 1999. Reviewed with a mean followup of 11 months, 17 patients (71%) resumed their preoperative level of ambulation. Knee range of motion averaged 1 degree - 103 degrees. No major surgical or significant medical complications were experienced by these patients. Our experiences with this small number of patients have shown that an immediate arthroplasty offers many advantages over open reduction and internal fixation for geriatric patients with poor bone quality, preexisting degenerative joint disease, and medical problems.

Osteoporosis: a disease in men.

Osteoporosis, a metabolic bone disease characterized by low bone mass, microarchitectural deterioration of bone tissue, and increased susceptibility to fracture, now is recognized to be a disease of men and women. Based on bone mineral density measurements established by the World Health Organization, approximately 2 million men in the United States currently are affected. Information about the pathogenesis, diagnosis, and treatment of osteoporosis in men is accumulating. Estrogen now is known to be necessary for normal skeletal maturation and for maintenance of adult bone mass in men. As we will discuss, the age-related decline in bone mineral density in men seems to result from an age-related decline in the levels of bioavailable estrogen. Osteoporosis candidate genes have been discovered, and their polymorphisms may predispose men to a weakened, osteoporotic phenotype. Determining a bone mineral density standard to diagnose men with osteoporosis has proven challenging, often leaving diagnosis until a fragility fracture has occurred. General prevention strategies for osteoporosis in men are targeted at men most likely to sustain a fragility fracture. Specific medical therapies for osteoporosis in men, including bisphosphonates and intermittent parathyroid hormone, are proving promising.

Recent advances in the treatment of gunshot fractures of the humeral shaft.

The increase in violent crime has lead to an increase in gunshot-induced fractures in the United States. Injuries to the upper extremity are common. The treatment of gunshot injuries depends on the extent of soft tissue disruption and the type and location of fracture. Most of these injuries are a result of low-energy gunshot wounds that may be treated conservatively under the appropriate conditions. Low-energy fractures that require operative stabilization may be done with predictable results for achieving union with intramedullary fixation or compression plating. Complex open fractures from gunshot wounds associated with neurovascular injuries present a therapeutic challenge to the orthopaedic surgeon. The fractures associated with these injuries often are comminuted and unstable. Bone loss is common. Soft tissue disruption plays a more important role in high-energy gunshot-induced fractures. In these cases, external fixation is the treatment of choice for stabilization. Recent advances in the use of external fixation have led to quick fracture stabilization, stability for vascular repair, and access to the wound for debridement and subsequent soft tissue surgery.

Outcomes of elderly patients with nondisplaced femoral neck fractures.

Seventy patients with nondisplaced femoral neck fractures treated by cannulated screw fixation were followed up prospectively for 6 months. Preinjury Functional Independence Measure scores and comorbidities were recorded as were operative time, type of anesthesia, estimated blood loss, transfusions, and postoperative complications. Functional Independence Measure scores were reassessed at 3 and 6 months. The mean age of the patients was 78 years. The 6-month mortality was 5.7%. The mean overall Functional Independence Measure scores at 3 and 6 months were 86% and 89% of the initial score respectively. Locomotion Functional Independence Measure scores at 3 and 6 months were 73% and 89% of the initial score, respectively. Multiple regression analysis found patient age and initial overall Functional Independence Measure score to be independent predictors of overall, locomotion, and transfer Functional Independence Measure scores at 3 months. At 6 months, only initial Functional Independence Measure score predicted ultimate Functional Independence Measure scores. This suggests that patient age may affect the speed of recovery but not the ultimate functional result. Of comorbidities, only chronic obstructive pulmonary disease significantly affected functional recovery at 3 months, but not at 6 months. Operative time, estimated blood loss, type of anesthesia, and patient gender did not affect functional outcomes. Patients who sustain a nondisplaced femoral neck fracture experience predictable and lasting loss of function. Low initial functional status predicts a poorer outcome. Age and pulmonary comorbidity affect speed of recovery.

Functional outcomes and mortality vary among different types of hip fractures: a function of patient characteristics.

A review of prospectively collected data was done to compare functional outcomes and mortality among patients with different hip fracture types. Five hundred thirty-seven elderly patients who sustained a hip fracture were followed up prospectively. Orthopaedists blinded to treatment and outcome radiographically classified the fractures as either: (1) nondisplaced or impacted femoral neck; (2) displaced femoral neck; (3) stable intertrochanteric; or (4) unstable intertrochanteric fracture. Functional independence measure scores were calculated for preinjury function and at 2- and 6- month follow-ups. Comorbidities, operative details, postoperative complications, and deaths were recorded. Six-month mortality was lowest for patients with nondisplaced femoral neck fractures (5.7%) and highest for patients with displaced femoral neck fractures (15.8%), but multivariate analysis only identified preinjury function as an independent predictor of mortality. All preinjury and followup functional independence measure scores were greatest for patients with nondisplaced femoral neck fractures and least for patients with unstable intertrochanteric fractures. However, multivariate analysis identified only patient age and preinjury functional independence measure scores as independent predictors of functional outcome. These data show differences in mortality and functional outcomes among fracture types that can be attributed to differences in functional status before injury.