Tag Archive | JBJS

WALANT Surgery Works for Ankle Fractures

OrthoBuzz previously covered WALANT (wide awake, local anesthesia, no tourniquet) surgery, and we very recently featured a JBJS study about treating ankle fractures in a limited-resource environment. These 2 concepts unite in a JBJS study by Tahir et al., which reports on WALANT surgery for ankle fractures in Pakistan.

WALANT surgery has enjoyed increasingly broad dissemination throughout the world since its popularization by Canadian hand surgeon Don Lalonde. Considering its origins, WALANT has been adopted most enthusiastically by the hand-surgery community, but it has been applied successfully to other anatomic regions. WALANT principles are particularly relevant in settings where anesthetic resources and expertise may be limited, such as hospitals where monitoring equipment that helps ensure safe general anesthesia is not readily available.

Tahir et al. used WALANT during open reduction/internal fixation (ORIF) in 58 patients (average age of 47 years) with a distal fibula fracture; 62% of those fractures were OTA-classified as 44C2. Among the excellent results in this cohort were a mean intraoperative VAS pain score of 1.24 and a mean operative time of <1 hour. These findings point to the potential for safely using WALANT techniques during ORIF of other fracture types.

The authors emphasize, however, that “each patient should be individually assessed by the operating surgeon,” not only for injury characteristics that contraindicate WALANT, such as substantial swelling, but also for anxiety and psychological disorders. Consequently, Tahir et al. recommend that surgeons undertaking WALANT procedures have a backup anesthetist available so they can convert to general anesthesia in cases of patient anxiety.

Marc Swiontkowski, MD
JBJS Editor-in-Chief

Life Expectancy Informs Choice of Hemi Implant after Femoral Neck Fracture

Predicting life expectancy is not an exact science. But estimating the remaining years of life in elderly patients with a femoral neck fracture may help orthopaedists determine whether to use unipolar or bipolar hemiarthroplasty components when surgically managing that population. So suggest Farey et al. in the February 3, 2021 issue of The Journal of Bone & Joint Surgery.

The relevant “magic number” for life expectancy after femoral neck fracture is 2.5 years. The authors arrived at that number by performing statistical analyses on nearly 63,000 cases of femoral neck fractures treated with either modular unipolar or bipolar hemiarthroplasty. Patients were in their early 80s on average at the time of surgery. The researchers focused on revision rates because reoperations in this vulnerable group of patients typically yield poor results.

There was no between-group difference in overall revision rate within 0 and 2.5 years after the procedure. However, unipolar hemiarthroplasty was associated with a higher overall revision rate than bipolar hemiarthroplasty beyond 2.5 years after surgery (hazard ratio [HR], 1.86).

Farey et al. also drilled down into reasons for revision and found that unipolar prostheses had a greater risk of revision for acetabular erosion, particularly in later postoperative time periods. Conversely, bipolar hemiarthroplasty was associated with a higher risk of revision for periprosthetic fracture, which the authors surmise might have arisen from the greater range of motion (and therefore activity levels) permitted by bipolar implants.

Although the authors did not perform a formal cost-benefit analysis related to this dilemma, they observed a nearly $1,000 USD price difference between the most commonly used bipolar and unipolar prostheses. Farey et al. therefore propose that the more expensive bipolar prosthesis may be justified for patients with a life expectancy beyond 2.5 years, but that the unipolar design is justified for patients with a postoperative life expectancy of ≤2.5 years.

Click here to listen to a 15-minute OrthoJOE podcast about this topic, featuring JBJS Editor-in-Chief Dr. Marc Swiontkowski and OrthoEvidence Editor-in-Chief Dr. Mo Bhandari.

Click here to see a 3-minute Video Summary of this study.

Click here to read a JBJS Clinical Summary comparing total hip arthroplasty with hemiarthroplasty for displaced femoral neck fractures.

Day-of-Surgery Post-op Talks with Patients Worth the Effort

Personal communication goes a long way in establishing and cementing surgeon-patient relationships. I learned years ago that something as simple as giving patients my email address diminished their fear and anxiety because it gave them direct access to me. Now, due largely to the recent pandemic, more numerous and sophisticated forms of “telemedicine” have come to the forefront of health-care delivery.

In the February 3, 2020 issue of The Journal, Kingery et al. report results from a randomized controlled trial investigating whether brief day-of-surgery communications between surgeons and patients who underwent an outpatient sports-medicine procedure affected patient satisfaction scores. To find out, the researchers randomized 3 surgeons into 1 of 3 patient-communication modalities:

  1. No contact (standard of care)
  2. Phone call the evening after surgery
  3. Video call the evening after surgery

Satisfaction among the 250 participating patients was assessed at the first face-to-face postoperative visit using the standardized S-CAHPS questionnaire, which evaluates patient experiences before, during, and after an outpatient surgery. Patients also completed a 9-item questionnaire specifically designed for this study. The authors focused on the rate of “top-box” responses (the highest rating possible) in each of the 3 groups group.

Kingery et al. found that day-of-surgery postoperative communication between patients and surgeons, either by video or phone, significantly improved S-CAHPS top-box response rates relative to the no-contact group. Specifically, phone calls were associated with a 16.1 percentage point increase in the top-box response rate, while video calls were associated with a 17.8 percentage point increase. The authors also found that patients contacted by video or phone were more likely to recommend their surgeon and felt more informed than those who were not contacted.

Although the authors did not record the content or duration of the conversations in the 2 contact groups, these data strongly suggest that patients welcome day-of-surgery communication—and that such encounters improve patient satisfaction. I therefore think we all should consider leveraging technology, especially that which has arisen from the COVID pandemic, to help give our patients a better overall health-care experience. A few non-reimbursable minutes at the end of the day could have lasting, positive effects on both patients and us.

Matthew R. Schmitz, MD
JBJS Deputy Editor for Social Media

Micromotion Followed by Rigid Fixation Boosts Fracture Healing

Mechanical factors undoubtedly play a role in the rate and quality of fracture healing. For example, the seminal work on fracture strain by the late Stephan Perren, MD helped us understand that the larger the overall fracture area, the lower the fracture strain—and that less strain encourages fracture union.

But with the variety of fracture planes and orientations, different energies imparted to produce the fracture, and multiple patient factors such as bone density, the best approaches by which to positively influence fracture-healing mechanics are still being investigated. We do know that motion mechanics come into play for nonsurgically stabilized fractures in our patients.

In the February 3, 2021 issue of The Journal, Glatt et al. provide more data on the role of micromotion in fracture healing. The authors created a 2-mm transverse tibial osteotomy in 18 goats and then used an external fixator to achieve static, rigid fixation in 6 of the osteotomized tibiae. Six other tibiae were treated with a fixator that allowed 2 mm of controlled axial micromotion for the 8-week duration of the experiment. (This so-called dynamization technique was championed more than 30 years ago by Fred Behrens, MD, who established that inducing micromotion helps stimulate maturation of fracture callus.) The remaining 6 tibiae were initially treated with dynamization, followed by rigid fixation during weeks 4 through 8—a technique known as reverse dynamization. The experimental groups simulated 3 different versions of cast or brace immobilization without surgery.

Using radiographs, micro-CT data, and torsion testing, the investigators found that, after 8 weeks, bones in the reverse-dynamization group were significantly stronger and showed more characteristics of intact, contralateral tibiae than the treated bones in the other 2 groups. I agree with the authors’ conclusion that their results “may have important consequences regarding our understanding of the optimum fixation stability necessary to maximize the regenerative capacity of bone-healing clinically.” With this experiment, Glatt et al. have added another important piece to the puzzle that Drs. Perren and Behrens started solving many years ago.

Marc Swiontkowski, MD
JBJS Editor-in-Chief

Accuracy of Rapid Alpha Defensin Test Confirmed

In June 2019, OrthoBuzz reported on the FDA approval of a rapid, lateral-flow alpha defensin test that helps detect periprosthetic joint infections (PJIs) from synovial fluid. In the January 20, 2021 issue of The Journal of Bone & Joint Surgery, Deirmengian et al. report findings from the Level II diagnostic-accuracy study that led to this FDA approval.

The authors compared diagnostic sensitivity and specificity of the lateral-flow alpha defensin test with the “gold-standard” PJI diagnostic criteria endorsed by the Musculoskeletal Infection Society (MSIS) in 2013. They made the comparison with 2 groups: a prospective patient cohort of 305 patients with a failed hip or knee arthroplasty (57 of whom were determined by MSIS criteria to have a PJI) and among a “control” cohort of 462 synovial fluid samples (65 of which met MSIS criteria for PJI).

After excluding 17 patients from the prospective cohort who had grossly bloody aspirates, the authors found a sensitivity of 94.3% and a specificity of 94.5% for the lateral-flow test in that group. Among the control cohort, the lateral-flow test’s sensitivity was 98.5% and its specificity was 98.2%. Furthermore, after combining data from the 2 cohorts, Deirmengian et al. found no performance difference between the lateral-flow test (which yields results in 10 to 15 minutes) and the lab-based alpha defensin ELISA test (which typically yields results in 24 hours). Finally, in a nonstatistical descriptive comparison between the 2 alpha defensin tests and 4 other individual lab tests used in the MISI criteria to diagnose PJI (such as synovial fluid white blood cell count and erythrocyte sedimentation rate), the authors concluded that “alpha defensin tests led to the highest raw number of correct diagnoses (accuracy).”

The 2018 International Consensus Meeting on Orthopaedic Infections included alpha defensin as a minor criterion. That decision, along with these findings and the FDA approval of the lateral-flow test, should lead to increased adoption of the rapid test—and to more data being published on its clinical utility.

JBJS Clinical Classroom: A Better Path to Orthopaedic Proficiency

In 2017, JBJS launched JBJS Clinical Classroom on NEJM Knowledge+, an adaptive learning platform that meets the unique learning needs and requirements of orthopedic surgeons worldwide. Clinical Classroom identifies gaps in individual users’ knowledge and assesses their self-confidence in 11 orthopaedic subspecialties. Curated by orthopaedic experts and powered by leading-edge learning technology, Clinical Classroom has quickly become a leading platform for orthopaedic surgeons who want to:

  • Improve their knowledge and critical thinking skills
  • Stay up-to-date with the latest and highest-quality orthopaedic findings
  • Earn AMA PRA Category 1 Credits™ (for US learners who successfully answer questions), and
  • Earn SAE credits for Maintenance of Certification (for US learners who successfully answer questions)

To meet changing user needs and implement technological advancements, JBJS has improved the overall user experience in Clinical Classroom. These significant changes were made possible by upgrading from the original Knowledge+ platform to the new Rhapsode platform by Area9.

Highlights of JBJS Clinical Classroom on Rhapsode include the following:

  • Enhanced look and feel: The clean, modern Dashboard and improved navigation allow you to interact with and move effectively throughout the product for optimal learning.
  • Updated adaptive algorithms that incorporate the most advanced adaptive tools for more efficient individualized learning
  • All-device access: Clinical Classroom is now user-friendly on all devices, with special enhancements for the mobile experience.
  • In-platform coaching delivers helpful tips tailored to your performance and confidence as you progress through subspecialties.
  • And so much more

To learn more about the enhanced JBJS Clinical Classroom on Rhapsode, and to stay up-to-date with ongoing developments, click here.

To explore Clinical Classroom pricing and subscription options, visit the JBJS Store today.

The Journal of Bone and Joint Surgery, Inc. is accredited by the Accreditation Council for Continuing Medical Education (ACCME) to provide continuing medical education for physicians.

A Closer Look at Impingement in Ceramic-on-Ceramic THA

Total hip arthroplasty (THA) with ceramic-on-ceramic (CoC) bearings has become popular, especially in younger patients, largely because of the material’s durability. However, CoC bearings are susceptible to catastrophic failure through fracture. Although the definitive mechanistic pathway for ceramic fracture has not been elucidated, one of the proposed mechanisms is impingement between the ceramic acetabular liner and the metal neck of the femoral stem. In the January 20, 2021 issue of The Journal, Lee et al. take an illuminating radiographic dive into the patterns of impingement in CoC THA.

The authors analyzed 244 cases of CoC THAs that had ≥15 years of radiographic follow-up. They found impingement-related notches at 77 sites in 57 (23.4%) of the cases. The notches were seen either on the neck (28 cases) or on the shoulder (29 cases) of the stem. In 8 cases, notches were found in multiple locations.

All of the neck notches were found when either a medium-neck or long-neck head was used. Shoulder notches were found on the stem only when a short-neck head was used. Lee et al. observed that the use of medium-neck or long-neck heads prevents the ceramic liner from contacting the stem shoulder because the liner impinges on the neck first. The authors also noted that the mean cup inclination was significantly lower in the cases with notched stems compared to stems without notches (36.9° vs 39.8°), and that mean anteversion was higher in the cases with notches (19.9° vs 17.3°).

We have known that impingement can occur between the ceramic liner and metal stem in CoC THA, but this study suggests that it may happen in a significant proportion of patients, both along the neck and shoulder of the stem. Manufacturers should consider these findings when designing implants, and patients and surgeons considering CoC implants may want to avoid short-neck heads, if possible. Also, because impingement-related stem notching appears to occur more frequently with lower cup inclination and higher anteversion, surgical technique remains vitally important in these cases, independent of implant design and selection.

Finally, we should note that the patients in this study were young (mean age of 43 years) and Asian. Asian culture and lifestyle include frequent squatting and sitting cross-legged, which Lee et al. say “induces more impingement between the stem and liner.”

Matthew R. Schmitz, MD
JBJS Deputy Editor for Social Media

Halt Bisphosphonates in Patients with an Atypical Femoral Fracture

Osteoporosis is the major contributor to the increasing incidence of fragility fractures associated with low-energy falls. The other contributor is the populous baby-boomer generation that is entering its final decades of life. Our orthopaedic community has made some progress in “owning the bone” to prevent fragility fractures. For example, we have gotten better at identifying a first fragility fracture as a major risk for a subsequent fracture; we more frequently initiate medical treatment for osteoporosis, and we are more inclined to refer patients with a first fragility fracture to a fracture liaison service, if one exists (see related OrthoBuzz posts).

However, orthopaedic physicians treating patients with fragility fractures need to remember that osteoporosis-treatment complications are also within our scope of responsibility. In the January 20, 2021 issue of The Journal, Lee et al. retrospectively analyzed 53 patients (all women, with an average age of 72 years) who had a complete atypical femoral fracture (AFF), a phenomenon primarily related to bisphosphonate treatment for osteoporosis. More than 37% of these patients were given bisphosphonates after their first AFF, and among those 53 patients who went on to show radiographic progression toward a second AFF in the contralateral femur, 61% used bisphosphonates after surgery for the first AFF.

The most shocking aspect of the findings by Lee et al. is the unacceptably high percentage of patients who remained on bisphosphonate therapy after the initial AFF. I wholeheartedly agree with Anna Miller, MD, who writes in her Commentary on this study that “an atypical stress fracture while on bisphosphonates should be considered a failure of bisphosphonate treatment, and that therapy should be stopped immediately.” If there is ongoing osteoporosis in such cases, the orthopaedic surgeon should consider prescribing an anabolic drug such as teraparatide or abaloparatide–and should communicate with the patient’s endocrinologist or other physician who might still be prescribing bisphosphonates.

In my opinion, we have to improve more quickly on both of these clinical issues–secondary fragility fracture prevention and treatment of bisphosphonate-therapy complications–because the population dynamics in the US and worldwide are evolving rapidly.

Click here to view a 2-minute video summary of this study’s design and findings.

Marc Swiontkowski, MD
JBJS Editor-in-Chief

When Does I&D Beat 2-Stage Exchange in Second rTKA?

It’s hard to contemplate “conservative treatment” in the case of a revised total knee arthroplasty (rTKA) with extensive instrumentation that needs a reoperation due to periprosthetic joint infection (PJI), because all the treatment options in that scenario are pretty complex. In the January 6, 2021 issue of JBJS, Barry et al. report on a retrospective review of 87 revisions of extensively instrumented rTKAs that found that irrigation and debridement (I&D) with chronic antibiotic suppression was as effective as 2-stage exchange in preventing another reoperation for infection—and more effective in terms of maintaining knee function.

The average follow-up of the cases studied was 3.2 years, and the authors carefully defined “extensive instrumentation.” Among the 56 patients who were managed with I&D and suppression and the 31 who were managed with the initiation of 2-stage exchange (average age in both groups approximately 67 years), no significant differences were found in the rates of reoperation for infection or mortality. However, 9 of the 31 patients (29%) in the 2-stage group never underwent the second-stage reimplantation. Among those 9, 3 died prior to reimplantation and 2 underwent amputation due to failure of infection control.

Moreover, at the time of the latest follow-up, a significantly higher percentage of patients in the I&D group were ambulatory (76.8% vs 54.8% in the 2-stage group) and were able to functionally bend their knee (85.7% vs 45.2% in the 2-stage group). The authors surmise that these 2 findings are related to the soft-tissue damage and bone loss that typically occur during stage-1 removal of rTKA components.

Barry et al. conclude that in similar situations “deviating from the so-called gold standard of 2-stage exchange and accepting the modest results of I&D may be in the best interest of the patient,” as long as there are no loose implants in the existing construct. But the “sobering” mortality rates in the study (39.3% in the I&D group and 38.7% in the 2-stage group) remind us that this clinical scenario is extremely challenging for patients and surgeons, no matter which option is selected.

Click here to view an “Author Insights” video about this study with co-author Jeffrey Barry, MD.

Same-Patient Trial Design Measures Incremental Improvements in TKA Outcomes

The clinical and functional outcomes after total knee arthroplasty (TKA) are generally very favorable. The 15% to 20% of subpar patient-reported outcomes are usually related to persistent pain. Orthopaedic researchers have exhaustively investigated patient factors and technical considerations to address dissatisfaction in this minority population of TKA patients.

Meanwhile, the orthopaedic community has focused on prosthetic design in its attempts to incrementally improve outcomes for the 80% to 85% of generally satisfied TKA patients. Clearly documenting those incremental improvements often requires elegant study design. That’s what we see in the January 6, 2021 issue of The Journal, where Kim et al. report findings from a randomized trial in which 2 different knee-implant designs were compared in the same patients after primary simultaneous bilateral TKA.

Each of the 50 patients (49 of them women) received a posterior-stabilized design in 1 knee and an ultracongruent prosthesis in the other. Kim et al. selected the Forgotten Joint Score (FJS) as the primary outcome. The FJS is a 12-item questionnaire that assesses patient awareness of the artificial joint during daily activities. At 2 years, the researchers found no between-knee differences in FJS. The ultracongruent knees showed more anteroposterior laxity and less femoral rollback than the posterior-stabilized knees, but there were, again, no between-group differences in following measures:

  • Range of motion
  • Knee Society and WOMAC scores
  • Side Preference and patient satisfaction

The ultracongruent advancement in prosthetic design does not appear to offer clinically important advantages over the posterior-stabilized design. But if additional TKA patients can be recruited into studies using clever and effective experimental designs like this one, the future is bright for more robust assessments of the incremental impact of prosthetic design on functional and clinical outcomes.

Click here to view an Infographic summarizing this study.

Marc Swiontkowski, MD
JBJS Editor-in-Chief