Search Our Scientific Publications & Authors

Am J Sports Med 2019 Apr 17:363546519836423. Epub 2019 Apr 17.

Department of Orthopaedic Surgery, University of California, San Francisco, San Francisco, California, USA.

Background: With a steadily increasing rate of anterior cruciate ligament (ACL) injury and reconstruction in the pediatric population, disagreement remains regarding the optimal reconstruction technique for patients with ACL injury and ≥2 years of growth remaining.

Purpose: This study aims to quantify the incidence of linear and angular growth disturbance of adolescents undergoing partial transphyseal ACL reconstruction (ACLR) while assessing graft failure rates, reoperation rates, and functional outcomes in the population.

Study Design: Case series; Level of evidence, 4. Read More

Am J Sports Med 2019 Apr 17:363546519833925. Epub 2019 Apr 17.

School of Medicine, Georgetown University, Washington, DC, USA.

Background: The use of artificial turf in American football continues to grow in popularity, and the effect of these playing surfaces on athletic injuries remains controversial. Knee injuries account for a significant portion of injuries in the National Collegiate Athletic Association (NCAA) football league; however, the effect of artificial surfaces on knee injuries remains ill-defined.

Hypothesis: There is no difference in the rate or mechanism of knee ligament and meniscal injuries during NCAA football events on natural grass and artificial turf playing surfaces. Read More

Asia Pac J Sports Med Arthrosc Rehabil Technol 2019 Apr 6;16:19-23. Epub 2018 Dec 6.

Department of Orthopaedics and Traumatology, Prince of Wales Hospital, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China.

Background: Biomechanical measurement tools have been developed and widely used to precisely quantify knee anterior-posterior laxity after anterior cruciate ligament (ACL) injury. However, validated objective device to document knee rotational laxity, though being developed by different researchers, are not yet widely used in the daily clinical practice. A new biomechanical device was developed to quantify knee internal and external rotations. Read More

J Orthop Res 2019 Apr 12. Epub 2019 Apr 12.

Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA.

The mechanism underlying non-contact anterior cruciate ligament (ACL) injury is multi-factorial and still object of debate. Computational models, in combination with in vivo and cadaveric studies, can provide valuable insight into the contribution of the different factors involved. The goal of this study was to validate four knee finite element models (two males and two females) to kinematic and strain data collected in vitro with an impact-driven simulator and use them to assess how secondary external knee loads (knee abduction moment, anterior shear force, and internal rotation torque) affect tibiofemoral contact forces and ACL force during impact. Read More

Open Access Maced J Med Sci 2019 Mar 28;7(6):982-986. Epub 2019 Mar 28.

Department of Orthopedics, Social Determinants of Health Research Center, Yasuj University of Medical Sciences, Yasuj, Iran.

Background: The posterior cruciate ligament is one of the important tissues and structures sustaining the knee joint, and its rupture or detachment may lead to joint instability or destruction.

Aim: The present study aimed at investigating the Open Reduction and Internal Fixation surgery of posterior cruciate ligament and comparing it to the normal knee of the same side.

Methods: In this study, 25 patients with avulsion fracture at the PCL joint were treated with open surgery and screw fixation. Read More

Indian J Orthop 2019 Mar-Apr;53(2):297-303

Center of Orthopaedics and Sport Medicine, Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao, China.

Background: The debate continues regarding the best way to reconstruct posterior cruciate ligament (PCL). The objective of this study was to compare the knee stability and clinical outcomes after single and double bundle (SB and DB) PCL reconstruction.

Materials And Methods: A total of 98 patients with PCL injury were enrolled for PCL reconstruction with four-strand semitendinosus and gracilis tendon autograft in the SB technique ( = 65) or two-strand Achilles allograft in the DB technique ( = 33). Read More

J Orthop Surg (Hong Kong) 2019 May-Aug;27(2):2309499019840822

1 Department of Orthopaedic Surgery, Hallym University Sacred Heart Hospital, Anyang-si, Gyeonggi-do, Korea.

Purpose: Recently, tunnel placements in anatomic positions have been emphasized for successful restoration of knee function after anterior cruciate ligament (ACL) reconstruction. The anteromedial portal technique is considered to be more favorable than the transtibial technique for anatomic femoral tunnel placements; however, it has some technical disadvantages. To minimize these disadvantages, the authors developed the curved dilator system (CDS). Read More

J Biomech 2019 Mar 22. Epub 2019 Mar 22.

McCaig Institute for Bone & Joint Health, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada; Schulich School of Engineering, University of Calgary, Calgary, AB, Canada. Electronic address:

Partial anterior cruciate ligament (p-ACL) rupture is a common injury, but the impact of a p-ACL injury on in vivo joint kinematics has yet to be determined in an animal model. The in vivo kinematics of the ovine stifle joint were assessed during 'normal' gait, and at 20 and 40 weeks after p-ACL transection (Tx). Gross morphological scoring of the knee was conducted. Read More

Arthroscopy 2019 Apr;35(4):1080-1082

Most acetabular labral tears are caused by abnormal osseous morphology, such as cam and/or pincer morphology and dysplasia. There is a high prevalence of asymptomatic cam morphology, pincer morphology, dysplasia, and acetabular labral tears in the general population. The addition of subjective patient symptoms and objective physical examination findings to imaging (plain radiographs, magnetic resonance imaging, and computed tomography) may yield the diagnosis of femoroacetabular impingement syndrome. Read More

J Orthop 2019 May-Jun;16(3):245-248. Epub 2019 Mar 7.

Orthopedic Associates of Michigan, 1111 Leffingwell Ave NE, Grand Rapids, MI, 49525, USA.

Objective: To highlight the incidence of grade III PCL injuries with simultaneous PCL & popliteus injury.

Methods: Inclusion criteria: patients who underwent PCL reconstruction for grade III PCL tear & minimum of 1-year follow-up. Exclusion criteria: associated ACL injury & insufficient follow up. Read More

J Knee Surg 2019 Mar 27. Epub 2019 Mar 27.

Sports Medicine Service, Beijing Jishuitan Hospital, Beijing, China.

The purpose of this study was to investigate the incidence and clinical characteristics of the "diagonal" lesion. A total of 273 consecutive patients with combined posterolateral corner (PLC) and posterior cruciate ligament (PCL) injuries were retrospectively analyzed. All preoperative knee joint evaluations were reviewed including the computed tomography, the anteroposterior (AP) view, the lateral view, the full-length long-standing AP view, and the physical examination results with the patient under anesthesia. Read More

Knee Surg Sports Traumatol Arthrosc 2019 Mar 26. Epub 2019 Mar 26.

Sports Surgery Clinic, Dublin, Ireland.

Purpose: To evaluate whether medial-sided bone bruising was associated with postero-medial meniscal tears in patients with an acute rupture of their anterior cruciate ligament (ACL).

Methods: A retrospective analysis of 150 consecutive patients who had an MRI scan within 8 weeks of their ACL rupture that underwent an ACL reconstruction was performed. Based on the intra-operative findings, two groups were identified: Group A (N = 75) had no postero-medial meniscal tear associated with the acute ACL rupture and Group B (N = 75) had a postero-medial meniscal tear found at time of reconstruction. Read More

Arthrosc Tech 2019 Feb 22;8(2):e163-e173. Epub 2019 Jan 22.

Knee Surgery-Arthroscopy and Sports Injuries Unit, Orthopedic Department, Mansoura University, Mansoura, Egypt.

Combined anterior cruciate ligament (ACL) and medial collateral ligament (MCL) injuries are the most common type of combined ligamentous injury of the knee. The optimal treatment for these combined injuries is controversial. Combined ACL and MCL-posterior oblique ligament (POL) reconstruction avoids late anteromedial rotatory instability and chronic valgus instability of the knee and decreases the increased stress on the ACL graft. Read More

J Orthop Surg Res 2019 Mar 21;14(1):85. Epub 2019 Mar 21.

Sports Medicine Department, Rasoul Akram Hospital, Iran University of Medical Sciences, Tehran, Iran.

Objective: We compared autografts and allograft using partial and complete transphyseal anterior cruciate ligament (ACL) reconstruction techniques among skeletally immature individuals.

Methods: Male and females younger than 18 and 16 years old, respectively, diagnosed with ACL tear from April 2006 to March 2012 entered the study. One group had four-strand hamstring autograft, and the other had tibialis posterior allograft reconstruction. Read More

Sports Biomech 2019 Mar 18:1-13. Epub 2019 Mar 18.

c Sports Medicine Research Institute, College of Health Sciences , University of Kentucky , Lexington , KY , USA.

Internal and external rotational knee stability is essential for sports performance and excessive rotation can lead to injury but is rarely assessed in injury risk analysis. The objectives of this study were to determine the between-session reliability, discriminant validity and potential sex differences of a dynamic postural stability (DPS) assessment that challenges transverse plane knee stability. Thirty-six individuals (21. Read More

Clin Sports Med 2019 Apr 19;38(2):275-283. Epub 2019 Jan 19.

The Wellington and Portland Children's Hospitals, Queen Anne Street Medical Centre, 18-22, Queen Anne Street, London W1G 8HU, UK.

The internal brace is a ligament repair bridging concept using braided ultra-high-molecular-weight polyethylene suture tape and knotless bone anchors to reinforce ligament strength to allow early mobilization during early-phase healing. This concept can be used in the management of anterior cruciate ligament, posterior cruciate ligament, anterolateral ligament, medial collateral ligament, posteromedial corner, and posterolateral corner injuries. Ligament reinforcement is a concept in which a graft is reinforced and can be used in all aspects of knee ligament reconstruction. Read More

Clin Sports Med 2019 Apr 19;38(2):215-234. Epub 2019 Jan 19.

Department of Orthopaedic Surgery, Keck Medical Center of the University of Southern California, 1520 San Pablo Street, Suite 2000, Los Angeles, CA 90033, USA.

The multiple ligament injured knee is a complex biomechanical environment. When primary stabilizers fail, secondary stabilizers have an increased role. In addition, loss of primary restraints puts undue stress on the remaining intact structures of the knee. Read More

Knee Surg Relat Res 2019 Mar;31(1):37-43

Department of Orthopedic Surgery, The Armed Forces Capital Hospital, Incheon, Korea.

Purpose: This study was to evaluate changes of the mechanical loading pattern after anatomic anterior cruciate ligament (ACL) reconstruction by analyzing uptake patterns using combined single-photon emission computerized tomography and conventional computerized tomography (SPECT/CT).

Materials And Methods: On SPECT/CT, high signal intensity of the articular surface which shows biological activity and mean increase of mechanical loading was compared with that of the tibiofemoral shaft as a comparative signal. The proportion of positive signals was evaluated in all compartments of the operated knee. Read More

J Orthop Surg (Hong Kong) 2019 Jan-Apr;27(1):2309499019833606

1 Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, Kobe, Japan.

Purpose:: The factors affecting anterior tibial subluxation (ATS) have not yet been well examined. To assess the factors affecting ATS in anterior cruciate ligament (ACL)-deficient knees.

Methods:: One hundred twenty-four patients with unilateral ACL injuries were included. Read More

J Knee Surg 2019 Mar 1. Epub 2019 Mar 1.

Department of Orthopaedic Surgery, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Republic of Korea.

We aimed to compare and analyze the outcomes of arthroscopic posterior cruciate ligament (PCL) reconstruction with the Achilles tendon allograft and the quadriceps tendon allograft. Twenty-nine patients who received the same procedure of arthroscopic PCL reconstruction within our inclusion criteria were reviewed retrospectively. There were 13 patients in the Achilles tendon allograft group and 16 patients in the quadriceps tendon allograft group. Read More

Trauma Case Rep 2019 Apr 15;20:100174. Epub 2019 Feb 15.

Post Graduate Institute of Medical Education & Research, sector 12, Chandigarh 160012, India.

Introduction: Proximal tibia intra-articular fractures are commonly associated with ligamentous injuries and require early diagnosis and intervention. An array of fracture patterns can be encountered, and Schatzker's classification is a standard description to identify them. However, several patterns have been described that fall outside the ambits of this classification. Read More

J Surg Orthop Adv 2018 ;27(4):325-328

Department of Orthopaedic Surgery, University of Illinois at Chicago.

The goal of this study was to define the course of the popliteal artery (PA) and determine any variability among different patient demographics; by identifying risk factors for injury, surgeons can decrease patient morbidity and mortality. Ninety-four adult magnetic resonance imaging studies of the knee were reviewed. In extension, the artery is at most 7. Read More

J Biomech 2019 Mar 12;86:125-131. Epub 2019 Feb 12.

Department of Kinesiology, University of Wisconsin-Milwaukee, Milwaukee, WI, USA.

Non-contact anterior cruciate ligament (ACL) injuries account for 70% of all ACL injuries, and can lead to missed time from activity for athletes and a predisposition for knee osteoarthritis. Prior research has shown that athletes who land in a stiff manner, with larger internal knee adduction and extension moments, are at greater risk for an ACL injury. A three-dimensional accelerometer placed at the tibial tuberosity may prove to be a low-cost means of assessing these risk factors. Read More

Injury 2019 Mar 1;50(3):784-789. Epub 2019 Feb 1.

Department of Orthopaedics Unit 3, Christian Medical College, Ida Scudder Road, Vellore, Tamil Nadu 632004, India.

Background: Contrary to acute posterior cruciate ligament (PCL) bony tibial avulsions, surgical management of chronic injuries is technically challenging and appears to be controversial. We sought to assess the outcome of a novel screw post augmentation technique in neglected cases.

Methods: 16 patients were followed up in a tertiary single-center retrospective study. Read More

Orthop J Sports Med 2019 Jan 22;7(1):2325967118819831. Epub 2019 Jan 22.

Department of Orthopaedics, Duke University, Durham, North Carolina, USA.

Background: Knee positions involved in noncontact anterior cruciate ligament (ACL) injury have been studied via analysis of injury videos. Positions of high ACL strain have been identified in vivo. These methods have supported different hypotheses regarding the role of knee abduction in ACL injury. Read More

SAGE Open Med Case Rep 2019 11;7:2050313X18823102. Epub 2019 Jan 11.

Department of Orthopedic Surgery, Jichi Medical University, Shimotsuke, Japan.

Knee dislocation with concomitant multiligament injury is a rare and devastating injury. We report the successful repair of a rare case of open knee dislocation with concomitant multiligament injury and patellar tendon rupture of an 18-year-old male due to a motorcycle accident. The patient presented with an open wound running parallel to the knee joint line and patellar tendon rupture with full exposure of the cartilage of the distal femur. Read More

Arthroscopy 2019 Feb;35(2):302-303

Centre Orthopédique Santy, Hôpital Privé Jean Mermoz, Groupe Ramsay Générale de Santé, FIFA Medical Center of Excellence, Lyon, France.

In the context of anterior cruciate ligament reconstruction surgery, anterolateral ligament reconstruction is now recognized as a reliable option to control rotatory instability and should be considered in the knee surgeon's modern armamentarium. By highlighting its daily practical application, this infographic presents the indications for this specific additional lateral augmentation, the anatomic and biomechanical principles that underline its rationale, and the clinical outcomes from recent large series. In 2013, Claes et al. Read More

Sports Med 2019 Mar;49(3):453-462

Division of Physical Therapy, Center for Human Movement Science, School of Medicine, The University of North Carolina at Chapel Hill, CB# 7135 Bondurant Hall, Chapel Hill, NC, 27599-7135, USA.

Background: Anterior cruciate ligament (ACL) injury is one of the most common injuries in sports, and the injury mechanisms are not completely clear. Bone bruises seen on magnetic resonance imaging (MRI) following ACL injuries may provide significant information for determining ACL injury mechanisms.

Objective: The aim was to determine ACL injury mechanisms through an evaluation of locations of bone bruises associated with ACL injury. Read More

Orthop J Sports Med 2019 Jan 10;7(1):2325967118820057. Epub 2019 Jan 10.

Department of Orthopaedic Surgery, University of California, San Francisco, San Francisco, California, USA.

Background: An altered tibial position is still present despite anterior cruciate ligament (ACL) reconstruction. It has been demonstrated that an abnormal tibial position after an ACL injury may play a role in subsequent injuries to the meniscus, which can lead to early cartilage degeneration.

Purpose: To determine changes in both the tibial position and the meniscal matrix present before and after ACL reconstruction as well as to evaluate the association between these 2 variables in ACL-injured knees 3 years after reconstruction. Read More

Am J Sports Med 2019 Feb 18;47(2):318-323. Epub 2019 Jan 18.

The Steadman Clinic, Vail, Colorado, USA.

Background:: Recent clinical studies identified sagittal plane posterior tibial slope as a risk factor for increased postoperative laxity after single-bundle posterior cruciate ligament reconstruction (PCLR).

Purpose/hypothesis:: To retrospectively compare the degree of posterior tibial slope and its effect on posterior tibial translation (PTT) after double-bundle (DB) PCLR. Our null hypothesis was that preoperative tibial slope would not be associated with graft laxity. Read More

Am J Sports Med 2019 Mar 16;47(3):598-605. Epub 2019 Jan 16.

Centre Orthopédique Santy, FIFA Medical Center of Excellence, Hôpital Privé Jean Mermoz, Groupe Ramsay-Generale de Santé, Lyon, France.

Background:: Lateral meniscus posterior root tears (LMPRTs) result in loss of hoop forces and significant increases in tibiofemoral contact pressures. Preoperative imaging lacks reliability; therefore, holding an appropriate index of suspicion, based on the epidemiology of and risk factors for LMPRT, may reduce the rate of missed diagnoses.

Purpose:: The primary objectives of this study were to evaluate the incidence of and risk factors for lateral meniscus root lesions in a large series of patients undergoing anterior cruciate ligament (ACL) reconstruction. Read More

Am J Sports Med 2019 Feb 14;47(2):303-311. Epub 2019 Jan 14.

Department of Orthopaedics, Rhode Island Hospital, Providence, Rhode Island, USA.

Background:: Multiple anatomic features of the femoral condyles and tibial plateau have been shown to influence knee biomechanics and risk of anterior cruciate ligament (ACL) injury. However, it remains unclear how these anatomic factors affect the midterm outcomes of ACL reconstruction.

Hypothesis:: Decreased femoral notch width, increased posterior and coronal slopes, and decreased concavity of the tibial plateau are associated with inferior clinical, patient-reported, and osteoarthritis-related outcomes 7 years after ACL reconstruction. Read More

Am J Sports Med 2019 Feb 14;47(2):312-317. Epub 2019 Jan 14.

The Steadman Clinic, Vail, Colorado, USA.

Background:: Recent biomechanical studies have identified sagittal plane posterior tibial slope as a potential risk factor for posterior cruciate ligament (PCL) injury because of its effects on the kinematics of the native and surgically treated knee. However, the literature lacks clinical correlation between primary PCL injuries and decreased posterior tibial slope.

Purpose/hypothesis:: The purpose of this study was to retrospectively compare the amount of posterior tibial slope between patients with PCL injuries and age/sex-matched controls with intact PCLs. Read More

Knee Surg Sports Traumatol Arthrosc 2019 Jan 11. Epub 2019 Jan 11.

Clinic of Trauma, Hand and Reconstructive Surgery, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany.

Purpose: The literature shows no consensus regarding the best method and timing for the treatment of acute knee dislocations. Studies indicate that a one-stage procedure performed in the early stages of injury can lead to superior results. The aim of this study was to evaluate the results after performing early surgical repair with additional suture augmentation (ligament bracing) of all torn ligaments in acute knee dislocations. Read More

J Pediatr Orthop 2019 Jan 8. Epub 2019 Jan 8.

Elite Sports Medicine, Connecticut Children's Medical Center.

Background: Prior research has shown decreased accuracy of meniscal injury detection using magnetic resonance imaging (MRI) for anterior cruciate ligament (ACL)-deficient adult patients as well as ACL-deficient pediatric and adolescent patients. The objectives of this study were the following: (1) assess the diagnostic ability of MRI in detecting meniscal injuries for pediatric and adolescent patients undergoing arthroscopic ACL reconstruction and (2) characterize the unrecognized meniscal injuries.

Methods: The sensitivity, specificity, positive predictive value, and negative predictive value of meniscal tears (medial, lateral, or both) on MRI were calculated for the 107 patients in this cohort. Read More

Orthop J Sports Med 2018 Dec 28;6(12):2325967118817297. Epub 2018 Dec 28.

Department of Orthopaedic Surgery, Akershus University Hospital, Lørenskog, Norway.

Background: The outcomes after posterior cruciate ligament reconstruction (PCLR) have been shown to be inferior to those of anterior cruciate ligament reconstruction. There is a lack of knowledge regarding prognostic factors of PCLR outcomes.

Purpose: To explore the effect of injury mechanism and concomitant ligament injuries on patient-reported outcomes at 2-year follow-up after PCLR. Read More

Z Orthop Unfall 2019 Jan 7. Epub 2019 Jan 7.

Abteilung und Poliklinik für Sportorthopädie, Klinikum rechts der Isar der Technischen Universität München.

Reasons for failure of anterior cruciate ligament (ACL) reconstructions are manifold and require a multifactorial explanatory approach. In addition to technical failures, many modifiable and non-modifiable risk factors for a new ACL injury have to be considered. Technical failures primarily include non-anatomical tibial and femoral tunnel position. Read More

Gait Posture 2019 02 29;68:494-499. Epub 2018 Dec 29.

Human Performance Laboratory, Division of Biokinesiology and Physical Therapy, University of Southern California, 1540 Alcazar St, CHP 155, Los Angeles, CA, 90089-9006, United States. Electronic address:

Background: Clinically, normalization of gait following anterior cruciate ligament reconstruction (ACLr) is defined as the absence of observable deviations. However, biomechanical studies report altered knee mechanics during loading response (LR); a time of double limb support and weight transfer between limbs. It is conceivable that subtle adjustments in whole body mechanics, including center of mass (COM) velocity and ground reaction force (GRF) peaks and timing, are present. Read More

Radiography (Lond) 2019 Feb 16;25(1):33-38. Epub 2018 Aug 16.

Kafkas University, Faculty of Medicine, Department of Radiology, Kars, Turkey. Electronic address:

Introduction: The posterior tibial slope (PTS) is believed to be a risk factor for anterior cruciate ligament (ACL) injury. The aim of this study was to reveal the differences in terms of PTS measurements on lateral knee radiographs between ruptured and non-injured cases as well as between males and females in regard to ACL alignment.

Methods: The study cohort included 92 patients (61 males and 31 females) with ACL rupture and 101 individuals (59 males and 42 females) who visited the Orthopedics Department but had no ACL injury. Read More

J Knee Surg 2018 Dec 21. Epub 2018 Dec 21.

Department of Orthopaedic Surgery, Washington University in St. Louis, St. Louis, Missouri.

Increased tibial slope may be associated with anterior cruciate ligament (ACL) injuries, although potential confounding effects from various patient characteristics and radiographic quantification methods have not been rigorously studied. The association of the slope of the lateral plateau with recurrent ACL injury after primary ACL reconstruction has recently been reported, but the role of medial slope is less well defined. The purpose of this study was to (1) assess medial tibial slope measurement reliability among examiners, (2) compare medial tibial slope values between patients undergoing primary ACL reconstruction, reinjured patients undergoing revision ACL reconstruction, and a control cohort with an intact ACL, (3) analyze if the medial tibial slope is an independent risk factor for noncontact ACL injury, and (4) assess how different anatomical references affect medial tibial slope values. Read More

Oper Orthop Traumatol 2019 Feb 18;31(1):3-11. Epub 2018 Dec 18.

Abteilung für Sportorthopädie, Klinikum rechts der Isar, TU München, Ismaninger Str. 22, 81675, München, Deutschland.

Objective: Anatomical reduction of bony avulsions of the posterior cruciate ligament (PCL) by a suture-bridge™ (Arthrex, Naples, FL, USA) technique to restore posterior knee stability.

Indications: Acute bony tibial avulsions of the PCL and multifragmentary fractures.

Contraindications: Chronic condition of avulsion fractures or posterior instability, advanced knee osteoarthritis, high-grade soft tissue injury, infection. Read More

Knee Surg Sports Traumatol Arthrosc 2018 Dec 17. Epub 2018 Dec 17.

Department of Orthopaedics, University of North Carolina at Chapel Hill, 102 Mason Farm Rd # 2, Chapel Hill, NC, 27599, USA.

Purpose: Quadriceps weakness following anterior cruciate ligament reconstruction (ACLR) is linked to decreased patient-reported function, altered lower extremity biomechanics and tibiofemoral joint space narrowing. It remains unknown if quadriceps weakness is associated with early deleterious changes to femoral cartilage composition that are suggestive of posttraumatic osteoarthritis development. The purpose of the cross-sectional study was to determine if quadriceps strength was associated with T1ρ relaxation times, a marker of proteoglycan density, of the articular cartilage in the medial and lateral femoral condyles 6 months following ACLR. Read More

Orthop J Sports Med 2018 Dec 12;6(12):2325967118813083. Epub 2018 Dec 12.

Sports Medicine and Shoulder Service, Hospital for Special Surgery, New York, New York, USA.

Background: Prior to the annual National Football League (NFL) Draft, the top college football prospects are evaluated by medical personnel from each team at the NFL Scouting Combine. On the basis of these evaluations, each athlete is assigned an orthopaedic grade from the medical staff of each club, which aims to predict the impact of an athlete's injury history on his ability to participate in the NFL.

Purpose: (1) To identify clinical predictors of signs, symptoms, and subsequent professional participation associated with football-related injuries identified at the NFL Combine and (2) to assess the methodological quality of the evidence currently published. Read More

Med Eng Phys 2019 Feb 14;64:80-85. Epub 2018 Dec 14.

Medical Device Research Institute, College of Science and Engineering, Flinders University, Tonsley, SA, Australia. Electronic address:

Personalised information of knee mechanics is increasingly used for guiding knee reconstruction surgery. We explored use of uniaxial knee laxity tests mimicking Lachman and Pivot-shift tests for quantifying 3D knee compliance in healthy and injured knees. Two healthy knee specimens (males, 60 and 88 years of age) were tested. Read More

Asia Pac J Sports Med Arthrosc Rehabil Technol 2019 Jan 22;15:13-16. Epub 2018 Nov 22.

Department of Sports Medicine, Kameda Medical Center, Chiba, Japan.

Multiple ligament injury is associated with high instability; hence, it is necessary to restore stability through application of a reliable treatment strategy. We report our experiences in handling a case of ruptured anterior cruciate ligament (ACL) complicated by chronic bony avulsion of the posterior cruciate ligament (PCL). Favourable results were obtained as a result of ACR reconstruction following a new method for tensioning of the chronic tibial bony avulsion of PCL as a postero-medial bundle and augmentation by PCL anterolateral bundle reconstruction. Read More

MMW Fortschr Med 2018 12;160(21-22):69-71

Abteilung für Sportorthopädie, Klinikum rechts der Isar, Technische Universität München, Ismaninger Str. 22, D-81675, München, Deutschland.

Clin Biomech (Bristol, Avon) 2019 Jan 24;61:84-94. Epub 2018 Nov 24.

Mayo Clinic Biomechanics Laboratories, Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA; Sports Medicine Center, Mayo Clinic, Rochester, MN, USA; Department of Physiology & Biomedical Engineering, Mayo Clinic, Rochester, MN, USA; Department of Physical Medicine & Rehabilitation, Mayo Clinic, Rochester, MN, USA.

Background: The aim of the present study was to evaluate the relationship between tibial slope angle and ligament strain during in vitro landing simulations that induce ACL failure through the application of variable external loading at the knee. The hypothesis tested was that steeper posterior tibial slope angle would be associated with higher ACL strain during a simulated landing task across all external loading conditions.

Methods: Kinetics previously derived from an in vivo cohort performing drop landings were reproduced on 45 cadaveric knees via the mechanical impact simulator. Read More

Gait Posture 2019 02 27;68:244-251. Epub 2018 Nov 27.

Institute for Biomechanics, ETH Zürich, Switzerland. Electronic address:

Background: Prevalence of knee osteoarthritis increases because life expectancy continues to rise with an active patient population. Hence, the concept of unicompartmental knee arthroplasty (UKA) has regained popularity as a treatment option for unicompartmental knee osteoarthritis. Anterior cruciate ligament (ACL) deficiency is widely considered as a contraindication for UKA, however, there are conflicting reports. Read More