Orthogate Landmark Trials: Practice-Defining Musculoskeletal Evidence
Critical appraisals of practice-changing Level-I randomized controlled trials across flagship orthopaedic journals, structured using the SBAR framework for immediate surgical and clinical application.
- 1. Adductor Canal Block and Local Anesthetic vs Local Alone in ACL Reconstruction - The American Journal of Sports Medicine Level I RCT
- 2. Intraosseous Morphine for Pain Control in Primary Total Knee Arthroplasty - The Journal of Bone and Joint Surgery Level I RCT
- 3. Dual Mobility vs Single Bearings in High-Risk Primary Total Hip Arthroplasty - The Journal of Arthroplasty Level I RCT
1. Adductor Canal Block and Local Anesthetic Versus Local Anesthetic Alone in ACL Reconstruction: A Double-Blind Randomized Controlled Trial
Authors: Ojaghi R, Locke E, Elmi P, Pickell M | Journal: The American Journal of Sports Medicine (Sep 2026) | View Source / DOI
Situation
Effective postoperative analgesia is vital for ambulatory discharge and immediate rehabilitation after anterior cruciate ligament reconstruction (ACLR). While adductor canal blocks (ACB) and local infiltration analgesia (LIA) are widespread, whether adding ACB to rigorous intraoperative LIA provides additive clinical benefit remains heavily debated.
Background
Femoral nerve blocks cause quadriceps weakness that impairs immediate weight-bearing and stability. ACB preserves motor function better than femoral blocks, but administering routine ACB consumes pre-op holding resources, requires ultrasound guidance, adds procedural billing costs, and carries risks of nerve injury or block failure.
Assessment & Findings
- Study Design & Cohort: Double-blind, placebo-controlled randomized trial (Level I Evidence, ClinicalTrials.gov NCT04721119). 100 consecutive patients undergoing primary ACLR under general anesthesia were randomized 1:1 to LIA + sham saline injection (n = 50) vs LIA + active ACB (n = 50).
- Primary Endpoint: No statistically significant difference in cumulative 24-hour postoperative oral opioid consumption (morphine milligram equivalents) was detected between the LIA + ACB cohort and the LIA-only cohort (p > 0.05).
- Secondary Endpoints: Visual Analog Scale (VAS) pain scores across PACU discharge, 6 hours, 12 hours, and 24 hours demonstrated no superiority in the ACB arm. Quadriceps activation (active straight-leg raise at 3 hours), Quality of Recovery-15 (QoR-15) scores, and 1-week Knee Injury and Osteoarthritis Outcome Scores (KOOS) showed equivalent outcomes.
Recommendation & Practice Takeaway
Clinical Pearl: Meticulous, surgeon-administered intraoperative local infiltration analgesia (peri-capsular, graft harvest site, and port sites) is fully sufficient for pain control in routine ACL reconstruction. Omitting routine pre-operative ultrasound-guided adductor canal blocks can streamline surgical turnaround, lower patient facility charges, and prevent rare peripheral neuropathies without compromising post-op analgesia or early recovery milestones.
2. Effectiveness of Intraosseous Morphine for Pain Control in Total Knee Arthroplasty: A Double-Blinded, Randomized Trial
Authors: JBJS Research Collective | Journal: The Journal of Bone and Joint Surgery (Am) (2026) | View Source / DOI
Situation
Severe early postoperative pain following primary total knee arthroplasty (TKA) impedes early range of motion, lengthens hospital stay, and elevates outpatient opioid dependence. Intraosseous (IO) delivery of local anesthetics and opioids into the proximal tibia or distal femur has gained traction as an adjunct for prolonged local analgesia.
Background
While intraosseous vancomycin is proven for surgical prophylaxis, mixing intraosseous morphine into antibiotic bone cement or regional intraosseous flushes lacks high-level randomized evidence regarding whether it delivers durable systemic or local pain relief beyond standard multi-modal protocols.
Assessment & Findings
- Study Design & Cohort: Double-blind, randomized controlled trial (Therapeutic Level I). 100 primary elective TKA patients under spinal anesthesia with surgeon-administered adductor canal blocks received an intraoperative IO injection containing 500 mg vancomycin in 110 mL saline either with 10 mg morphine (experimental arm) or without morphine (control arm). 88 patients completed daily automated text surveys (6 surveys/day for 14 days).
- Primary Pain Scores: Linear mixed-effects (LME) models revealed no statistically significant difference in daily VAS pain scores between cohorts at any evaluated time point over the 14-day postoperative window (p = 0.969).
- Opioid Consumption: No difference in post-anesthesia care unit (PACU) narcotic requirements, total morphine milligram equivalents (MME) consumed at 48 hours, or cumulative 14-day outpatient opioid use (p = 0.377). Incidence of nausea and emesis was comparable between arms.
Recommendation & Practice Takeaway
Clinical Pearl: Intraoperative intraosseous morphine does not improve postoperative pain control, reduce narcotic consumption, or accelerate functional recovery after primary TKA. Arthroplasty surgeons should resist adopting intraosseous opioid adjuncts, relying instead on proven periarticular cocktail infiltration, motor-sparing nerve blocks, and multimodal oral analgesics.
3. The John Charnley Award: A Randomized Controlled Trial of Dual Mobility and Single Bearings for Patients at High Risk of Dislocation Following Primary Total Hip Arthroplasty
Authors: The Charnley Award Multicenter Study Group | Journal: The Journal of Arthroplasty (2026) | View Source / DOI
Situation
Instability remains the leading cause for early revision following primary total hip arthroplasty (THA). Dual-mobility (DM) articulations are increasingly utilized in vulnerable patient cohorts, but prospective randomized trial data comparing DM to standard large-head single bearings (SB) in specifically defined high-risk cohorts have been lacking.
Background
Patients with spinopelvic stiffening (prior lumbar fusion or ankylosing conditions), advanced age (≥ 75 years), neuromuscular disorders, or hyperlaxity experience dislocation rates exceeding 5% to 10% with traditional bearings. However, concerns regarding DM include intraprosthetic dislocation, fretting corrosion, and increased component cost.
Assessment & Findings
- Study Design & Cohort: Multicenter randomized controlled trial (Level I Evidence, n = 555). Patients undergoing primary posterior approach THA meeting strict high-risk instability criteria (prior lumbosacral fusion n = 170, age ≥ 75, severe spinopelvic stiffness, or neuromuscular deficit) were randomized to DM bearings (n = 271, mean effective head 42 mm) vs standard SB femoral heads (n = 284; 36 mm, 40 mm, or 44 mm). Median follow-up was 23 months.
- Dislocation Rates: Two dislocations occurred in the DM group (0.7%) compared with six in the SB group (2.1%). Although DM conferred a 3-fold absolute risk reduction in dislocation, this difference did not reach statistical significance (p = 0.29) due to the overall lower-than-anticipated baseline dislocation incidence in contemporary large-head posterior THA.
- Revision & Survivorship: 2-year dislocation-free survivorship was 99.0% (DM) vs 97.6% (SB) (p = 0.63). All-cause 2-year revision-free survivorship was 97.5% in DM vs 96.4% in SB (p = 0.53). Prosthetic joint infection was the predominant revision indication (0.7% DM vs 1.8% SB). Patient-reported outcome measures (PROMs) were equivalent across all postoperative intervals.
Recommendation & Practice Takeaway
Clinical Pearl: Dual mobility demonstrates an impressive 0.7% dislocation rate in complex spinopelvic and high-risk patients. However, when contemporary 36 mm and 40 mm heads with anatomical soft tissue repairs are utilized in posterior THA, standard single bearings achieve acceptable 2-year stability (2.1% dislocation rate). Routine DM construct upgrades may not be cost-effective for all borderline patients, but remain strongly recommended for severe rigid spinopelvic mismatch and neuromuscular disease.
