The effect of pre-operative shoulder injections on post-operative opioid use, infection and revision following shoulder arthroplasty.

Background: Treatment of glenohumeral osteoarthritis (GHOA) may include conservative management with use of intraarticular injections, prior to considering total shoulder arthroplasty (TSA). The purpose of this study was to assess trends in the use of preoperative cortisone (CO) and hyaluronic acid (HA) injections, as well as investigate the relationship between injection use and infection or revision arthroplasty following TSA. Methods: Pearl Driver was used to identify all patients undergoing TSA for GHOA between 2010 and 2018. Patients were categorized based on the type and number of injections they received. Outcomes of interest included post-operative opioid use, post-operative infection, and risk of revision surgery within 1 year of the index procedure. Results: The incidence of patients receiving a CO or HA injections within 1 year of their TSA decreased by 83% and 54%, respectively. Patients who had received 1 or more steroid injections had higher odds of prolonged opiate use following surgery. Patients that received 1 or 2 CO injection prior to TSA had an increased risk of needing revision surgery. Discussion: Use of intraarticular injections for the management of GHOA has declined. Patients receiving preoperative injections had increased odds of prolonged opiate use and the need for revision surgery.

The Effect of Surgeon and Hospital Volume on Morbidity and Mortality After Femoral Shaft Fractures.

OBJECTIVES: The aim of this study was to characterize the case volume dependence of both facilities and surgeons on morbidity and mortality after femoral shaft fracture (FSF) fixation. METHODS: Adults who had an open or closed FSF between 2011 and 2015 were identified in the New York Statewide Planning and Research Cooperative System database. Claims were identified by International Classification of Disease-9, Clinical Modification diagnostic codes for a closed or open FSF and International Classification of Disease-9, Clinical Modification procedure codes for FSF fixation. Readmission, in-hospital mortality, and other adverse events were compared across surgeon and facility volumes using multivariable Cox proportional hazards regression, controlling for patient demographic and clinical factors. Surgeon and facility volumes were compared between the lowest and highest 20% to represent low-volume and high-volume surgeons/facilities. RESULTS: Of 4,613 FSF patients identified, 2,824 patients were treated at a high or low-volume facility or by a high or low-volume surgeon. Most of the examined complications including readmission and in-hospital mortality showed no statistically significant differences. Low-volume facilities had a higher 1-month rate of pneumonia. Low-volume surgeons had a lower 3-month rate of pulmonary embolism. CONCLUSION: There is minimal difference in outcomes in relation to facility or surgeon case volume for FSF fixation. As a staple of orthopaedic trauma care, FSF fixation is a procedure that may not require specialized orthopaedic traumatologists at high-volume facilities.

The JAY (Joint Active Yoke) orthosis for a complex pip fracture-dislocation with failed volar plate repair: A case report.

INTRODUCTION: This case report details the postsurgical rehabilitation and outcome of a 57-year old neurosurgeon who underwent hemi-hamate arthroplasty and volar plate repair for a complex ring finger proximal interphalangeal (PIP) fracture-dislocation sustained after a fall while snowboarding. Following re-rupture and repair of his volar plate, the patient was fitted for a "yoke" relative motion flexor orthosis, termed a JAY (Joint Active Yoke) orthosis, in a manner reverse to that which is commonly used for extensor-related injuries. STUDY DESIGN/METHODS: A 57 yo right hand-dominant male who suffered a complex PIP fracture-dislocation with failed volar plate repair undwent hemi-hamate arthroplasty and early active motion following using a custom-fabricated joint active yoke orthosis. PURPOSE OF THE STUDY: The purpose of this study is to illustrate the benefits of this orthosis design in allowing for active controlled flexion of the repaired PIP joint with assist from the adjacent fingers, while also reducing joint torque and dorsal displacement forces. RESULTS: A satisfactory active motion outcome was achieved with maintenance of PIP joint congruity allowing the patient to return to work as a neurosurgeon at 2-months post-operatively. DISCUSSION: There is little published literature on the use of relative motion flexion orthoses following PIP injuries. Most current studies are isolated case reports on boutonniere deformity, flexor tendon repair, and closed reduction of PIP fractures. The following therapeutic intervention was considered an important contributor to a favorable functional outcome, as it minimized unwanted joint reaction forces in a complex PIP fracture-dislocation and unstable volar plate. CONCLUSION: Future research with greater level of evidence is required to establish the various applications of relative motion flexion orthoses, as well as determine the appropriate time at which to place the patient in a relative motion orthosis following operative repair to prevent long-term stiffness and poor motion.

YouTube as a Source of Patient Information for Cubital Tunnel Syndrome: An Analysis of Video Reliability, Quality, and Content.

BACKGROUND: This study seeks to examine the reliability, quality, and content of YouTube videos on cubital tunnel syndrome, on which there is presently a paucity of information. METHODS: The top 50 unique YouTube videos by relevance resulting from the Boolean search term "cubital tunnel + cubital tunnel syndrome" were identified, with video properties for analysis including source, upload date, duration, views, and comments. Content was assessed using the Journal of American Medical Association (JAMA) criteria, the Global Quality Score (GQS), and a "Cubital Tunnel-Specific Score" (CTSS). RESULTS: The average video saw 72 108 ± 199 362 views, with videos produced by allied (nonphysician) health professionals demonstrating the highest mean views (111 789 ± 294 471 views). Videos demonstrated low mean JAMA scores (2.4/4 ± 0.7), GQS (2.8/5 ± 1.3), and CTSS (7.5/21 ± 4.3), with academic and nonacademic physician videos demonstrating significantly greater mean GQS and CTSS scores when compared with videos by allied health professionals. Positive independent predictors for GQS included academic sources (ß = 1.871), nonacademic physician sources (ß = 1.651), and video duration (ß = 0.102), which were likewise positive predictors for CTSS (ß = 4.553, 4.639, 0.374). Content relating to surgical techniques or approaches for cubital tunnel decompression had the greatest CTSS scores (11.2 [4.2]). CONCLUSIONS: YouTube is a source of highly accessible information on cubital tunnel syndrome, although the average video presents generally poor and inadequate information. Directing patients toward higher quality video resources can be a meaningful component of patient education.

Return to Activity After Arthroscopically Assisted Triangular Fibrocartilage Complex Repair: A Systematic Review.

OBJECTIVE: To evaluate patients' ability to return to preinjury activity level after arthroscopically assisted triangular fibrocartilage complex (TFCC) repair. DATA SOURCES: The PubMed electronic library was systematically searched from inception to August 2021 for any eligible articles using a combination of the phrases "TFCC," "return to sport," "return to work," and "athlete." RESULTS: Studies that evaluated patients who had undergone arthroscopic repair of isolated TFCC injury and reported objective or patient-reported outcome measures were included. Fifteen studies representing 478 patients fulfilled the inclusion criteria. An average of 84% of patients were able to fully return to their previous work or sport activities. Most studies reported that range of motion (ROM) and grip strength (GS) both returned to >90% of the contralateral side, and every study that evaluated pain levels found a significant reduction in pain postoperatively. Mayo Modified Wrist Score was reported as excellent or good in 83% of patients, and the average Disabilities of the Arm, Shoulder, and Hand score was 13.8 postoperatively. CONCLUSION: Patients were able to return to their previous work or sport activities at a high rate after TFCC repair, even those participating in more strenuous activities. Measurable functional outcomes of ROM and GS were also reliably restored to near preinjury levels. Patient-reported outcomes of pain and disability were similarly improved after TFCC repair. Current literature has established the long-term success of TFCC repair but is lacking in evaluation of the time points at which patients can expect functional status to be restored.

YouTube as a Source of Patient Information for Ankle Arthroplasty: Quantitative Analysis of Video Reliability, Quality, and Content.

Background. There are limited data on the quality and content of videos discussing total ankle arthroplasty (TAA) on the YouTube video platform. Methods. The first 60 unique YouTube videos resulting from the keyword query "ankle arthroplasty" and "ankle replacement" were analyzed for comprehensiveness and quality. Content was assessed using the Journal of American Medical Association (JAMA) benchmark criteria, DISCERN, Global Quality Scale (GQS), and an arthroplasty-specific score. Results. Videos demonstrated low mean DISCERN (49.2/80), GQS (3.2/5), and arthroplasty-specific scores (4.3/12) with substantial variability between videos. Most of the content was produced by nonacademic physicians (46.7%) and academic sources (21.7%). Academic videos saw significantly higher mean JAMA scores (P = .013) but were otherwise comparable to non-academic physicians. Commercial content demonstrated significantly low-quality scores compared to academic (P = .012) and physician (P = .008) sources despite the highest mean viewership. Conclusions. Information on TAA on the YouTube platform is highly variable based on video source, with generally poor quality and content.Level of Evidence: Level V, systemic review of non-peer reviewed resources.

Excessive Derotational K-Wire Angulation Decreases Compression by Headless Compression Screw.

Background Scaphoid fracture is the most common carpal bone fracture. Open reduction internal fixation of scaphoid fractures typically undergo stabilization by a single headless compression screw (HCS). During screw insertion, a derotational Kirschner wire (K-wire) is often placed for rotational control of the near and far fragment. Questions/Purposes The aim of this study was to determine if there is an angle of derotational K-wire placement in relation to the axis of a HCS that compromises the amount of compression generated at a fracture site by the HCS. We hypothesize that increased off-axis angle will lead to decreased compression across the fracture site. Methods A Cellular Block 20 rigid polyurethane foam (Sawbones, Vashon, WA) scaphoid model was created to eliminate variability in bone mineral density in cadaveric bone. MiniAcutrak HCS screws (Acumed, Hillsboro, OR) were used for testing. Three conditions were tested: (1) HCS with derotational wire inserted parallel to the HCS (zero degrees off-axis); (2) HCS with derotational wire inserted 10 degrees off-axis; and (3) HCS with derotational wire inserted 20 degrees off-axis. Results A statistically significant difference in the mean compression of the control group (56.9 N) was found between the mean compression with the derotational K-wire placed 20 degrees off-axis (15.2 N) ( p = 0.001). Conclusions Compression at the fracture site could be impeded by placing an excessively angulated off-axis derotation wire prior to insertion of the HCS. Clinical Relevance Our study adds a new detail to the optimal technique of HCS placement in scaphoid fractures to improve compression and fracture union.

Volume and Variability of Foot and Ankle Case Exposure During Orthopaedic Residency: 2014-2019.

BACKGROUND: Exposure to a comprehensive breadth and volume of surgical cases is a fundamental component of orthopaedic education, though standardization of case exposures across residency programs is limited to a small amount of required case minimums. Significant variability in exposure to subspecialty cases, such as foot and ankle surgeries, can create distinctly different residency experiences. METHODS: Accreditation Council for Graduate Medical Education (ACGME) surgical case logs from 2014 to 2019 for leg/ankle and foot/toes were examined following the 2013 implementation of case minimums. Average surgical case volume across subcategories and the average volume of different residency percentiles were analyzed to assess variability. RESULTS: The mean total volume of case exposure for graduating orthopaedic residents has increased significantly since 2014 for both leg/ankle cases (28.6%) and foot/toes (27.8%), though totals were still down compared with when ACGME reporting began in 2007. Arthrodesis exposures have increased significantly for leg/ankle (69.2%) and foot/toes (93.8%) cases since 2014, and ankle arthroscopy has increased 20.7%. Disparities in total cases between 10th and 90th percentile programs have shown a nonsignificant decrease over time, with significant differences between leg/ankle arthrodesis (8-fold), leg/ankle arthroscopy (13-fold), and foot/toe arthrodesis (3.5-fold) in 2019. CONCLUSION: The mean volume of foot and ankle case exposures among graduating residents has continued to rise since the implementation of case minimums in 2013 but disparities in volume are present, most notably concerning arthrodesis and arthroscopy. Recognition and future attention toward addressing this variability can be meaningful in promoting a more comprehensive, standardized orthopaedics education. LEVEL OF EVIDENCE: Level III: Retrospective comparative study.

Socioeconomic Disparities in the Utilization of Total Knee Arthroplasty.

BACKGROUND: Despite strong evidence supporting the efficacy of total knee arthroplasty (TKA), studies have shown significant socioeconomic disparities regarding who ultimately undergoes TKA. The purpose of the current study is to evaluate socioeconomic factors affecting whether a patient undergoes TKA after a diagnosis of osteoarthritis. METHODS: From 2011 to 2018, claims for adult patients diagnosed with knee osteoarthritis in the New York Statewide Planning and Research Cooperative System (SPARCS) database were analyzed. International Classification of Diseases (ICD), 9/10 CM codes were used to identify the initial diagnosis for each patient. ICD 9/10 PCS codes were used to identify subsequent TKA. Logistic regression analysis was performed to determine the effect of patient factors on the likelihood of having TKA. RESULTS: Of 313,794 osteoarthritis diagnoses, 33.3% proceeded to undergo TKA. Increased age (OR 1.007, P < .0001) and workers' compensation relative to commercial insurance (OR 1.865, P < .0001) had increased odds of TKA. Compared to White race, Asian (OR 0.705, P < .0001), Black (OR 0.497, P < .0001), and "other" race (OR 0.563, P < .0001) had lower odds of TKA. Hispanic ethnicity (OR 0.597, P < .0001) had lower odds of surgery. Compared to commercial insurance, Medicare (OR 0.876, P < .0001), Medicaid (OR 0.452, P < .0001), self-pay (OR 0.523, P < .0001), and "other" insurance (OR 0.819, P < .0001) had lower odds of TKA. Increased social deprivation (OR 0.987, P < .0001) had lower odds of TKA. CONCLUSION: TKA is associated with disparities among race, ethnicity, primary insurance, and social deprivation. Additional research is necessary to identify the cause of these disparities to improve equity in orthopedic care.

Trends in upper extremity injuries presenting to emergency departments during the COVID-19 pandemic.

INTRODUCTION: During the emergence of the SARS-CoV-2 (COVID-19) pandemic, there were substantial changes in United States (U.S.) emergency department (ED) volumes and acuity of patient presentation compared to more recent years. Thus, the purpose of this study was to characterize the incidence of specific upper extremity (UE) injuries presenting to U.S. EDs during the COVID-19 pandemic and analyze trends across age groups and rates of hospital admission compared to years prior. METHODS: The National Electronic Injury Surveillance System (NEISS) database was queried to identify patients who presented to U.S. EDs for an UE orthopaedic injury between 2016 and 2020. Chi-square analysis and logistic regression were used to assess for differences in ED presentation volume and hospital admissions between pre-pandemic (2016 through 2019) and during-pandemic (2020) times. RESULTS: These queries returned 285,583 cases, representing a total estimate of 10,452,166 injuries presenting to EDs across the U.S. The mean incidence of UE orthopaedic injuries was 640.2 (95% CI, 638.2-642.3) injuries per 100,000 person-years, with the greatest year to year decrease in incidence occurring between 2019 and 2020 (20.1%). The largest number of estimated admissions occurred in 2020, with a total 135,018 admissions (95% CI, 131,518-138,517), a 41.6% increase from the average number of admissions between 2016 and 2019. CONCLUSION: There was a 20.1% decrease in the incidence of UE orthopaedic injuries presenting to EDs after the start of the COVID-19 pandemic with a concomitant 41.2% increase in the number of hospital admissions from the ED in 2020 compared to recent pre-pandemic years. We speculate that at least some elective, semi-elective or urgent ambulatory surgeries were canceled or delayed due to the pandemic and were subsequently directed to the ED for admission. Regardless of the cause of increased UE orthopaedic admissions, policy planners and administrators should be aware of the additional stresses placed on already burdened ED and inpatient services. LEVEL OF EVIDENCE: Level III - Retrospective Cohort Study.

Parenthood Among Orthopedic Surgery Residents: Assessment of Resident and Program Director Perceptions on Training.

Orthopedic residency training overlaps with common childbearing ages. The purpose of this study was to describe factors affecting male and female residents' family-planning decisions and attitudes of program directors (PDs) toward parenthood during residency. In 2018, using an anonymous survey model, residents and PDs in Accreditation Council for Graduate Medical Education-accredited orthopedic surgery programs were asked about their perceptions of parenthood on training, the availability of family-oriented services at their programs, and the effect of residency culture and policies on their decision to have children. This survey occurred in 2018. Three hundred forty-nine (76.2%) of 458 resident respondents were male and 109 (23.8%) were female. Two hundred four (49.9%) of 409 residents were unsure of their program's parental leave policy. Male residents reported taking an average of 0.8 weeks (95% CI, 0.0-4.0 weeks) of parental leave and females an average of 4.6 weeks (95% CI, 2.0-6.5 weeks) (P<.001). Female residents were more likely to report delaying having children during residency (56.73% vs 38.71%, P=.001) and were more likely to cite reputational concerns (57.63% vs 0.76%, P<.001) and effects on career opportunities (42.37% vs 7.57%, P<.001) as reasons for delaying parenthood. The most commonly cited negative effect of parenthood on residency training by PDs was reduction in off-duty educational time (15 of 29, 51.72%). Twenty-four (80%) of 30 PDs believe that training may need to be extended based on amount of maternity/paternity leave time taken off. Although parenthood during orthopedic training is common, both male and female residents reported delaying parenthood because of residency-related factors. Improved clarification of leave policies and establishment of clear guidelines for parenthood in residency may improve resident wellness. [Orthopedics. 2021;44(2):98-104.].

Prediction of ACL Force Produced by Tibiofemoral Compression During Controlled Knee Flexion: A New Robotic Testing Methodology.

Tibiofemoral compression force (TCF) is an important component of anterior cruciate ligament (ACL) injuries. A new robotic testing methodology was utilized to predict ACL forces generated by TCF without loading the ligament. We hypothesized that ACL force, directly recorded by a miniature load cell during an unconstrained test, could be predicted by measurements of anterior tibial restraining force (ARF) recorded during a constrained test. The knee was first flexed under load control with 25N TCF (tibia unconstrained) to record a baseline kinematic pathway. Tests were repeated with increasing levels of TCF, while recording ACL force and knee kinematics. Then tests with increasing TCF were performed under displacement control to reproduce the baseline kinematic pathway (tibia constrained), while recording ARF. This allowed testing to 1500N TCF since the ACL was not loaded. TCF generated ACL force for all knees (n=10) at 50° flexion, and for 8 knees at 30° flexion. ACL force and ARF had strong linear correlations with TCF at both flexion angles (R2 from 0.85 to 0.99), and ACL force was strongly correlated with ARF at both flexion angles (R2 from 0.76 to 0.99). Under 500N TCF the mean error between ACL force prediction from ARF regression and measured ACL force was 4.8 ± 7.3 N at 30° and 8.8 ± 27.5 N at 50° flexion. Our hypothesis was confirmed for TCF levels up to 500N, and ARF had a strong linear correlation with TCF up to 1500N TCF.

Effects of Proud Large Osteochondral Plugs on Contact Forces and Knee Kinematics: A Robotic Study.

BACKGROUND: Osteochondral allograft (OCA) transplantation is used to treat large focal femoral condylar articular cartilage defects. A proud plug could affect graft survival by altering contact forces (CFs) and knee kinematics. HYPOTHESIS: A proud OCA plug will significantly increase CF and significantly alter knee kinematics throughout controlled knee flexion. STUDY DESIGN: Controlled laboratory study. METHODS: Human cadaver knees had miniature load cells, each with a 20-mm-diameter cylinder of native bone/cartilage attached at its exact anatomic position, installed in both femoral condyles at standardized locations representative of clinical defects. Spacers were inserted to create proud plug conditions of +0.5, +1.0, and +1.5 mm. CFs and knee kinematics were recorded as a robot flexed the knee continuously from 0° to 50° under 1000 N of tibiofemoral compression. RESULTS: CFs were increased significantly (vs flush) for all proudness conditions between 0° and 45° of flexion (medial) and 0° to 50° of flexion (lateral). At 20°, the average increases in medial CF for +0.5-mm, +1-mm, and +1.5-mm proudness were +80 N (+36%), +155 N (+70%), and +193 N (+87%), respectively. Corresponding increases with proud lateral plugs were +44 N (+14%), +90 N (+29%), and +118 N (+38%). CF increases for medial plugs at 20° of flexion were significantly greater than those for lateral plugs at all proudness conditions. At 50°, a 1-mm proud lateral plug significantly decreased internal tibial rotation by 15.4° and decreased valgus rotation by 2.5°. CONCLUSION: A proud medial or lateral plug significantly increased CF between 0° and 45° of flexion. Our results suggest that a medial plug at 20° may be more sensitive to graft incongruity than a lateral plug. The changes in rotational kinematics with proud lateral plugs were attributed to earlier contact between the proud plug's surface and the lateral meniscus, leading to rim impingement with decreased tibial rotation. CLINICAL RELEVANCE: Increased CF and altered knee kinematics from a proud femoral plug could affect graft viability. Plug proudness of only 0.5 mm produced significant changes in CF and knee kinematics, and the clinically accepted 1-mm tolerance may need to be reexamined in view of our findings.

Effects of Anterior Closing Wedge Tibial Osteotomy on Anterior Cruciate Ligament Force and Knee Kinematics.

BACKGROUND: A certain percentage of patients undergoing anterior cruciate ligament (ACL) reconstruction will experience graft failure, and there is mounting evidence that an increased posterior tibial slope (PTS) may be a predisposing factor. Theoretically, under tibiofemoral compression force (TFC), a reduced PTS would induce less anterior tibial translation (ATT) and lower ACL force. HYPOTHESIS: Ten-degree anterior closing wedge osteotomy of the proximal tibia will significantly reduce ACL force and alter knee kinematics during robotic testing. STUDY DESIGN: Controlled laboratory study. METHODS: Eleven fresh-frozen human knees were instrumented with a load cell that measured ACL force as the knee was flexing continuously from 0° to 50° under 200-N TFC as our initial testing condition, followed by the addition of the following tibial loads: 45-N anterior force (AF), 5-N·m valgus moment (VM), 2-N·m internal torque (IT), and all loads combined. ACL force and knee kinematics were recorded before and after osteotomy. RESULTS: Osteotomy produced significant changes in the tibiofemoral position at full extension (as defined by a 2-N·m knee extension moment). This resulted in apparent knee hyperextension (9.4° ± 1.9°), posterior tibial translation (7.9 mm ± 1.6 mm), internal tibial rotation (3.2° ± 2.3°), and valgus tibial rotation (3.2° ± 1.5°). During straight knee flexion with TFC alone, osteotomy reduced ACL force to 0 N beyond 5° of flexion, and ATT was reduced between 0° and 45° ( P < .05). With TFC + AF, ACL force was reduced beyond 5° of flexion, and ATT was reduced between 5° and 45° ( P < .05). With TFC + VM, ACL force was less than 10 N beyond 5° of flexion, and ATT was reduced at all flexion angles ( P < .05). Under the loading conditions TFC + IT and TFC + IT + AF + VM, osteotomy did not significantly change ACL force or ATT at any flexion angle. CONCLUSION: In general, osteotomy lowered ACL force and reduced ATT when IT was not present. The benefits of osteotomy were negated when IT was included possibly because the dominant mechanism of ACL force generation was cruciate impingement from internal winding and not ATT. CLINICAL RELEVANCE: PTS-reducing osteotomy significantly decreased ACL force and reduced ATT for knee loads that did not include IT.

Contact Forces Acting on Large Femoral Osteochondral Allografts During Forced Knee Extension.

BACKGROUND: A single cylindrical graft plug is commonly used for large focal femoral defects during osteochondral allograft (OCA) transplantation. Excessive contact force (CF) on a proud plug could compromise initial healing. CFs during forced knee extension are of particular interest because this maneuver is used by therapists to restore early postoperative range of motion. HYPOTHESIS: A proud OCA plug will significantly increase the CF and significantly decrease the knee extension angle (KEA). STUDY DESIGN: Controlled laboratory study. METHODS: Eleven human knee specimens had miniature load cells installed in both femoral condyles at standardized locations representative of clinical defects. Each load cell had a 20-mm-diameter cylinder of native bone/cartilage attached at its precise anatomic location. Four spacers, 0.5 mm in thickness, were inserted sequentially between each load cell and its mounting bracket to create proud plug conditions of 0.5 to 2 mm. Measurements of the CF and KEA were recorded at extension moment levels up to 8 N·m. RESULTS: At 8 N·m, the mean CFs for flush plugs were 149 ± 18 N (lateral) and 34 ± 13 N (medial). The mean increases in the medial CF (compared with flush) for 0.5-mm, 1-mm, 1.5-mm, and 2-mm proud conditions were 31 N (+91%), 64 N (+188%), 111 N (+325%), and 154 N (+451%), respectively. Corresponding increases for lateral proud plugs were 55 N (+37%), 120 N (+81%), 162 N (+109%), and 210 N (+141%), respectively. The CFs (and CF increases) for lateral grafts were significantly ( P < .05) higher than corresponding values for medial grafts at each proudness condition. Medial plug proudness had no consistent effect on the KEA. A 1-mm proud lateral plug significantly reduced the KEA by -1.6° (0 N·m) and -0.9° (2 N·m). CONCLUSION: Graft proudness of only 0.5 mm significantly increased CFs during forced knee extension, emphasizing the surgical precision necessary to achieve normal CF levels. CLINICAL RELEVANCE: It is believed that some amount of CF is beneficial in the early stages of graft healing, and our findings suggest that forced knee extension may be well suited for this purpose. However, the surgeon should be aware that large extension moments can also generate relatively high CFs, especially if the plug is proud.