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Patellar tilt angle

Disorders of the Patellofemoral Joint: 4:imaging the

The average patella tilt angle was 6.3 (SD = 3.9) and 12.8 (SD = 8.4) degrees, respectively, for the two groups of patients. Twenty-three patients in group 2 underwent arthroscopy because of failure of conservative treatment, and the average patella tilt angle in this subgroup was 16.4 degrees Patellar Tilt And Displacement: LaurinMethod Axial radiograph technique Patellar tilt R Normal Draw Line A: linetangent to the summits of the femoral condyles Draw Line B: linetangent to the lateralpatellarfacet Line C lateral Line B medial patellar facet Normal: Angle(∠AB) between Line Aand Line Bis open laterally Line A ∠A The patellar tilt angle is defined as an angle formed by the anterior intercondylar line and transverse axis of the patella [ 20, 21, 22] (Fig. 3) The angle formed by these two lines is the patellar tilt angle (Fig. 4.22a, b). This angle should always be greater than 7 degrees even in full extension, and has been 12 to 14 degrees or more on the 15‑ to 20‑degree knee flexion tomographic slice in the knees of asymptomatic controls best to assess for lateral patellar tilt lateral patellofemoral angle (normal is an angle that opens laterally) angle between line along subchondral bone of lateral trochlear facet + posterior femoral condyles normal > 11

Lateral Pull and Patellar Tilt Tests The 2 most commonly used, nonradio-logical tests of patellar alignment other than those mentioned above are the lat-eral pull and patellar tilt tests (FIGURES 3 and 4). These tests are often used to cat-egorize patients and assess the potential benefit from surgery,101 especially latera The patellar tilt angle (as distinct from the lateral patellofemoral angle deter­mined on an axial radiograph) determined by CT or MRI is particularly useful in dif­ferentiating tilt from subluxation, because the posterior femoral condyles provide a much more consistent reference line for determining tilt (30) Patellar tilt is diagnosed by determining the lateral patellofemoral angle, which is calculated from lines drawn along the patella and along the condyles . It should be noted that accurate patellofemoral alignment cannot be truly assessed in normal MR imaging settings because the knee is positioned in full extension

The most superior section showing trochlear cartilage is selected for this measurement. The inclination is the angle formed between the plane of the lateral trochlear facet subchondral bone and a tangential line through posterior femoral condyles. An angle of <11º is considered abnormal ties. Realignment of the patella through conservative techniques has become the main emphasis of treatment. Due to this emphasis on patellar realignment, a need for a quantitative measurement of patellar orientation has developed. The A-angle is a goniometric measurement that assesses the relationship of the patella to the tibial tubercle

How is patellar tilt measured? The tilt angle is defined as the angle subtended by a line joining the medial and lateral edges of the patella and the horizontal. The radiograph (Merchant type) is taken with the foot pointing up, the lower edge of the film parallel to the ground, and the knee at 30 degrees flexion. Click to see full answer Lateral patellofemoral angle is the angle of a line drawn along the lateral joint surface of the patella (line A) and a line drawn along the anterior aspect of the condyles (line B). A patellofemoral angle opening laterally is considered normal. An angle opening medially indicates patellar tilt

- angle formed by lateral patellar facet & line drawn across most prominent aspects of anterior portion of femoral trochlea should be open laterally in normal patellofemoral joint; - CT scan: - may reproduce patellofemoral relationships including normal alignment, lateral patellar tilt, and patellar subluxation The MRI tilt angle is subtended by the plane of the posterior femoral condyles and a line drawn connecting the medial and lateral borders of the patella. The angle is assessed on the first cut that images the medial and lateral borders of the patella as well as the posterior femoral condyles Patellar tilt can also be assessed using the patellofemoral angle (PFA). PFA is the angle between a line drawn along the bony lateral patellar facet and another line along the anterior aspect of the femoral condyles. It is measured at the mid-point of the patella on the axial slices [ 48 ]

Patellar Tilt Patellar tilt refers to an abnormal angulation of the patella in the horizontal plane. The degree of tilt can be quantified in various ways. Common tools are the lateral patellofemoral angle of Laurin and the patellar tilt angle of Grelsamer Most tilt angles use the slope of the lateral facet as a measure of tilt. These tilt angles paradoxically diminish as patellar tilt increases, a potential source of confusion. In this study, we use an MRI tilt angle that increases in the same direction as the actual tilt, which is more intuitive. We examined 30 patients with tilt and 51.

The three most common radiographic measurements alignments of the patella are: the patellofemoral congruence angle (PFCA), the lateral patellofemoral angle (LPFA) and the lateral patellar displacement (LPD). The PFCA represents lateral patellar glide and lateral tilt, the LPFA represents lateral patellar tilt, while the LPD quantifies the. The patellar tilt angle is expressed as a positive value when the transverse axis of the patella is tilted laterally from the anterior inter-condylar line and as a negative value when it tilts medi-ally. Patellar displacement is defined as the distance between the intercondylar sulcus and the median ridg Medial and lateral patellar tilt were measured using a modification of the technique described by Sasaki and Yagi. 28 The patellar tilt angle was the angle formed by the lines joining the maximum width of the patella and the line joining the posterior femoral condyles (see Fig. 3 in the companion article by Powers in this issue). All tilt. Patellar tilt was assessed by lateral patellar tilt angle (LPTA). In addition, patellofemoral joint morphology was evaluated by measuring trochlear depth (TD), trochlear sulcus angle (TSA) and patella angle (PA)

The patellar tilt angle: correlation of MRI evaluation

All values medial and lateral to the zero-reference line SO are designated as negative and positive, respectively. b The patellar tilt angle (β) was measured as the angle between a line intersecting the widest bony structure of the patella and a line tangential to the anterior surface of the femoral condyles on a skyline vie However, the effect of FA on the patellar tilt angle (PTA) in patients with RPD is unclear. The aim of this study was to compare the FA and PTA between patients with RPD and healthy controls and to investigate the relationship between FA and PTA. MATERIAL AND METHODS A total of 30 knees with RPD and 30 knees from healthy volunteers were. further divided into subgroup Tn if the patellar tilt angle was < 5° and subgroup Tw if the angle was ≥ 5°. Pearson correlation test was used for the correlation analysis of the flexion gap, patellar tilt angle, and postoperative flexion range. Results: The mean postoperative flexion was 137.3° in group T and 137.5° in group L. The mean. The fifteen-degree tilt was taken as normal cut-off point for patellar cortex tilt angle in the control group. Results: In patients, the average tilt of patella, using the patellar cortex tilt angle was 15.26 versus 7.05 in the control group. Using Student's t test, the difference between the two means was significant (P<0.001) The lateral PF angle (LPFA - [1]) and patellar tilt angle (PTA - [2]) were measured in the SPRP and in twelve other planes (Fig. 1). Four of these were 5 and 10 mm above and below the SPRP, which simulated the superior-inferior joint location (Fig 1A). Four of these were rotated ± 5° and ± 10° from the SPRP about the x

The patellar tilt is the angle formed between the patellar bone-prosthesis interface and a line drawn across the anterior femoral condyles. A patellar tilt >5° shows patellofemoral instability 1, 14, 19. Figure 10. Merchant view showing patellar subluxation following TKA. Patellar Fracture. B, The congruence angle is within the normal range, but tilt is noted as the patellar transverse axis is lifted off from the horizontal. Another possible method of assessment could be the lateral patellofemoral angle (on computed tomography [CT] scans, the posterior femoral condyles could be used as reference) Patellar Component Tilt, Subluxation, and Dislocation Patellar component tilt is defined as the angle formed between the patellar bone-prosthesis interface and a line drawn across the anterior femoral condyles on the patellar (Merchant) view. A patellar tilt greater than 5 degrees is indicative of patellofemoral instability

Lateral patellar tilt · Lateral release Trochlear dysplasia · Trochleoplasty Plats principaux *avec des modifications Desserts (autres sujets) Lateral subluxation · Medial imbrication Dejour H et al. Knee Surg Sports Traumatol Arthrosc. 1994;2(1):19-26 Patellar tilt is measured as the angle between a line going through the patellar axis and a line tangential to the posterior condyles. Angles greater than 20 degrees are present in more than 80% of patients with patellar instability. In addition, CT imaging may used to quantify lateralization of the tibial tuberosity, known as the TT-TG distance The angle can be checked on the lateral scout. The following 3 radiologist measurements are made on 30 degree angle view only. Patella tilt: Base line is line between posterior femoral condyles. Line on lateral facet of patella. If angle between these is less than 10 degrees then abnormal. Lateral trochlear angle: Same base line The anteroposterior patellar-tilt angle is a clinically reliable measurement of patellar tilt in the sagittal plane that can be used to study patellofemoral tilt in a variety of clinical situations. The results of this study demonstrate that patients with patellar tendinitis have abnormal patellar tilt in the sagittal plane

An increased Q-angle correlated to medial patellar displacement and tilt (r = 0.38-0.54, p <0.001) in the cohort with anterior knee pain. Interpretation Clinicians are cautioned against using the Q-angle to infer patellofemoral kinematics - patellar tilt: - patellar subluxation: - Technique: - patient is supine with the knee flexed 45 deg at the tables edge; - cassette is held perpendicular to the tibia; - central beam directed caudally through patella at a 60 deg angle from vertical or 30 deg angle from horizontal; - Aglietti, et al. (1983 Patellar tilt. 20° Radiography (Sunrise) Magnetic resonance imaging X-ray computed tomography. Angle between axis of patella and bicondylar femoral line. Reference. Robinson P. Essential Radiology for Sports Medicine. Springer Science+Business Media. (2010). ISBN: 1441959734. Categories Patellar tracking disorder symptoms. Symptoms of patellar tracking disorder include: pain, and possibly swelling, in the front of the knee, that increases when you squat, jump, kneel, run, or walk.

As for the patella, most studies concentrate on its position relative to the trochlear groove, such as the patellar height, the patellar tilt angle, and the congruence angle. Studies focusing on changes in the patellar morphology in trochlear dysplasia are rare 13 - 17 The change of patellar rotation angle with knee flexion in 10 studies. Ten curves of different colors indicate the patellar tilt angles over knee flexion angle in 10 studies. Within 30° of knee flexion, all curves are confined to the range from −1° to 2°

(A) Supine Merchant view showing increased patellar tilt

Although knee joint X-rays are primarily used to diagnose LPCS, their detection rate of patellar tilt by measuring the congruence angle (CA) and patellar tilting angle (PTA) is low. Currently, its detection rate for patellar tilt by using PTA is approximately 70-80% . Some studies suggest that the narrow space of the lateral patellofemoral. The definition of patella tilt angle (PTA) is illustrated in (b), which is the angle, θ, between the femur and the patella's central planes which are colored in yellow and blue, respectively. The definition of patella lateral shift (PLS) is illustrated in (c), which is the distance, D , between the parallel approximate central planes of the. deformity (hip-knee-ankle [HKA] angle >15 degrees) or flexion contracture (>20 degrees), (3) bone defects more than 5mm, (4) conversion TKA following osteotomy o Lateral patellar compression syndrome is the improper tracking of the patella in the trochlear groove generally caused by a tight lateral retinaculum. Diagnosis is made clinically with pain with compression of the patella and moderate lateral facet tenderness and sunrise knee radiographs will often show patellar tilt in the lateral direction Knee tilt chairs provide full adjustment support for multiple tasks. The knee tilt action allows the person's feet to stay flat on the floor when the chair is tilted backward. Knee tilt chairs are ideal for general office, task and executive seating. Adjustment Features. 5″ incremental back height

The effect of patellar facet angle on patellofemoral

Patellar tilt Angle between transverse plane of patella and a horizontal line parallel with x-ray table Normal 5° or less Tilt can occur without subluxation Indicates tight lateral retinaculum 30 The patellar tilt angle was the angle between the PCL and the line defining the maximal patellar width . The bisect offset was defined as the percentage of the patella lateral to the midline ( 19 ) ( Fig 3c )

DETERMINING SUBLUXATION AND TILT USING - Patellofemora

Tests for lateral knee structure tightness. IV. Technique. Patient lies supine. Patella grasped between thumb and forefinger. Tilt Patella. Medial Patella compressed posteriorly. Lateral Patella lifted Patellar tilt was measured according to the method of Gomes et al.16): the angle between the anterior condylar axis and the resected surface of the patellar component was measured (patellar tilt angle), and lateral tilt was given a positive value (Fig. 1)

Merchant view To assess for patellar tilt, patellar subluxation, and trochlear dysplasia 20. Sulcus angle - measure of trochlear depth; average 138 >145 is indicative of trochlear dysplasia Congruence angle - measure of subluxation Approx 6 ± 11 in the medial direction Does not measure tilt The sulcus angle is formed Congruence angle. In addition, a physical therapist (T.J.B.) examined each knee for evidence of altered patellofemoral kinematics: (1) Q-angle of ≥15 degrees, 18, 31, 32 (2) a positive apprehension test, (3) patellar lateral hypermobility of ≥10 mm, 18 or (4) a positive J-sign. 18, 32, 33 Any knee that did not exhibit 1 or more of these 4 signs was excluded.

Patella Tilt (angle) angle between a line connecting medial and lateral edges of the patella, and the horizontal. Patella Tilt (angle) Angle <5 (degrees) normal patellar tilt. Knee Effusion. fluid in the knee. Knee Effusion. Pathology. Renal Cell Carcinoma. Pathology. Parfait Sign (Lipohemarthrosis Figure 2-7: The patellar tilt angle is measured with a line passing through the medial and lateral edges of the patella and a horizontal line. (Reproduced, with permission, from: Benjamin, J. and M. Chilvers, Correcting lateral patellar tilt at the time of total knee arthroplasty can result in overuse of lateral release The following measurements were obtained: 1) patella tilt angle of Grelsamer (PTA-G, the angle subtended by a line joining the medial and lateral edges of the patella and the horizontal) , 2) patella tilt angle of Sasaki (PTA-S, the angle sustended by a line through the medial and lateral edge of the patella and another line through the. Tables. IMAGING ANATOMY. Valgus/Varus on Standing AP View: 2 Methods. Measurement of Translational Force Exerted on Patella With Contraction of Extensor Mechanism. Measurement of Patellar Height. Measurement of Trochlear Inclination. Measurement of Trochlear Sulcus Angle. Measurement of Patellar Tilt. Qualitative Assessment of Patellar Subluxation Patellofemoral pain syndrome typically affects adolescents and young adults. Knee problems in older populations are more commonly caused by arthritis. Sex. Women are twice as likely as men are to develop patellofemoral pain. This may be because a woman's wider pelvis increases the angle at which the bones in the knee joint meet. Certain sports

Lateral patellar compression syndrome

Patellar Instability - Knee & Sports - Orthobullet

Tests for lateral knee structure tightness. Technique. Patient lies supine. Patella grasped between thumb and forefinger. Tilt Patella. Medial Patella compressed posteriorly. Lateral Patella lifted. Interpretation: Abnormal. Lateral Patella cannot be raised to horizontal The bony structure of the patellofemoral joint is another static stabilizer, especially during deeper knee flexion angles. Anatomical factors that predispose to dislocation include patella alta (high riding patella), trochlear dysplasia or lateral femoral condyle hypoplasia, and excessive lateral patella tilt

There were four cases of an abnormal patellar tilt angle of which three had another abnormality.The intraobserver and interobserver ICCs for the measurement of the sulcus angle were 0.94 and 0.92, respectively, indicating excellent reliability. For the patellar height ratios the values were 0.72 and 0.59, respectively, indicating good reliability / Lateral patellar tilt and its longitudinal association with patellofemoral osteoarthritis-related structural damage : The LPT-(as the angle between the longest patella diameter and posterior aspect of condyles) was measured using the axial knee MRI. Associations of LPT (every 5° increase) with MRI OA Knee Scoring-(MOAKS) for OA-related. The measurement results for the congruence angle, patellar tilt angle, and patellar lateral shift decreased significantly from the pretreatment measurements to the normal range at the latest follow-up, without a statistically significant difference between the 2 groups (P > .05). The median Kujala score had significantly improved after surgery Patellar tracking (e.g. J sign), patellar tilt, patellar mobility as well as signs of crepitus or joint effusion should be assessed and recorded 14. Q-angle should be recorded with the knee in a flexed position as this technique may have greater reliability and give a better representation of the relationship of the trochlear groove to the.

Effects of medial patellofemoral ligament reconstructionPatella Dislocation and SubluxationDynamic medial patellofemoral ligament reconstruction in

The Measurement of Patellar Alignment in Patellofemoral

Patellar subluxation, or a dislocation of the knee cap, requires a diagnosis and treatment from a doctor. You may need a brace, crutches, physical therapy, or, in some cases, surgery. Learn more. There was a statistically significant difference in all measurements when the groups were compared, except for external tibial torsion angle. The most sensitive and specific measurements for determining patellar instability were the trochlear groove angle, tibial tubercle-trochlear groove distance, average patellar tilt, and average patellar.

Disorders of the Patellofemoral Joint: 4:imaging the

MR Imaging of Patellar Instability: Injury Patterns and

  1. bone and tibial bone; the lateral patellar tilt angle in axial view is defined as the intersection angle between the patellar transverse axisandthelinethroughthe highest point of lateral and medial femoral condyles. The knee range of motion was also assessed. Results The mean follow-up period is 55.8 months. There wa
  2. Patella alta was associated with the highest maximal patellofemoral contact force and contact pressure. When averaged across all flexion angles, a normal patellar position was associated with the lowest contact pressures. - Luyckx et al., 2009. Functional varus & tibial internal rotatio
  3. However, patellar tilt angle was more close to preoperative status after KA TKA than after MA TKA (KA: 2.0 ± 1.6 degrees MA: 0.3 ± 1.2 degrees ). Fig. 7 Comparison of patellar tilt angle between mechanically aligned (MA) and kinematically aligned (KA) total knee arthroplasty (TKA). (A) Decreased.
  4. patellar tilt and . patellar grind tests . Positive results on these tests are consistent with the diagnosis of PFPS. The patient lies with the unaffected side down and the unaffected hip and knee at a 90-degree angle. If the IT-band is tight, the patient will have difficulty adducting the leg beyond the midline and may experience pain at.
Patellofemoral pain syndrome (pfps)

The four angles are: Spine bend, spine tilt, hip bend and knee flex. Each angle plays an equal and important role in helping you create an athletic and balanced address position and enables you to swing the club with precision and power. You'll also find that if you focus on the four angles, the remaining setup elements take care of themselves. 1 To compare the radiological parameters measured by dynamic four dimensional CT (4DCT) in the analysis of patellofemoral involvement of subjects (amplitude of patellofemoral tilt angle variations, coefficient of variation of the same angle, distance of lateral displacement of the patella ) in patients with patellofemoral clinical syndrome to those free of this syndrome (= control group)

Patellofemoral instability Radiology Reference Article

The patellar tilt is the angle between the transverse axis of the patella and The patellar tilt is the angle between the transverse axis of the patella and the anterior intercondylar line.The PT was assessed by a blinded observer using 30° skyline radiographs. Secondary Outcome Measures : Knee Society Score (KSS) [ Time Frame: 1 year ] The. 1- Pain alone: patellofemoral syndrome, 2- Pain from malalignment, i.e.- tilt and/or displacement, 3- Instability: subluxation and dislocation, 4- Wear and tear, i.e.- chondromalacia patella or arthritis, 5- Other problems from pain around the patella: e.g.- synovial plica, tendonitis, bursitis, Osgood Schlatter's disease, etc The 'Q-angle' — or quadriceps angle — is the angle between the quadriceps muscle and the patellar tendon. It's long been associated with valgus knee, but it may not be a valid or relevant measurement tool. The Q-angle is a two-dimensional measurement of a three dimensional structure. It doesn't account for variations in pelvic shape. The Q angle is determined between the quadriceps muscle running down the front of the thigh and its attachment through the patellar tendon below the knee joint. The patella is imbedded in this musculotendinous complex that allows the patient to straighten the knee

Arthroscopic Patellar Plication: An Option for PatellarShareMyRadiology 放射线学: Patellofemoral Pain Syndrome

The Clinical Efficacy of the A-Angle in Measuring Patellar

Congruence angle: (average '-' 6 degrees i.e. medial 6 degrees) Lateral patellofemoral angle : (if opens medially indicates patella tilt) Femoro-tibial rotation: Tibial torsion: (greater than 40 associated with maltracking) Femoral torsion: (average anteversion 15-24 degrees with range of 3-48 degrees Chondromalacia patella (knee pain) is the softening and breakdown of the tissue (cartilage) on the underside of the kneecap (patella). Pain results when the knee and the thigh bone (femur) rub together. Dull, aching pain and/or a feeling of grinding when the knee is flexed may occur. The most common way to treat symptoms of chondromalacia. Q angle and knee pain. was the primary contributor to lateral patellar tilt and displacement in participants with patellar pathology. Despite Powers' 2003 findings, the Q-angle is still generally believed to be larger in those with knee pain compared to their asymptomatic counterparts

How is patellar tilt measured? - AskingLot

angle formed by lateral patellar facet and a line drawn across most prominent aspects of anterior portion of the trochlea on a CT scan or Sunrise view radiograph if there is a negative patellar tilt on this measurement, the patient may benefit from a lateral release for pain relief index measures the portion of the patellar width lateral to the deepest point of the trochlear groove, with the lateral direction defined by the posterior condylar axis. Patellar lateral tilt is defined by the angle between a line along the medial-lateral axis of the patella and the posterior condylar axis Congruence of the patella and patella tilt can be assessed on the axial view. Specific measurements, which can be obtained from the radiographs, include the sulcus angle, the congruence angles, and the Insall-Salvati ratio (described below) Remember to limit the bend of your knee to a 30-degree angle at first. When your knee is bent past this point, your kneecap will have more contact with the thighbone, causing more pressure, pain, and possible cartilage damage. Shallow knee bend on one leg. slide 6 of 1 The Q angle also known as Quadriceps Angle, is a commonly used measurement in the evaluation and treatment of patellofemoral disorders.Because it is easily measured, it is often used in clinical practice. However, it is important to stress that the Quadriceps Angle should not be used as the sole factor in surgical decision making in recurrent patellar subluxation

Patellar Instability - RadReference

Measurements taken from the X-rays included one angle of the patella called patellar tilt, the angle between the patella and patellar tendon called the patella-patellar tendon angle or PPTA, and the thickness of the patellar tendon in three places. X-rays also showed any changes in the patella's pressure against the femur (thigh bone) Saddle tilt. The saddle tilt is an important adjustment that needs to be taken into consideration. Lets take a look at what happens when the saddle angle is in the up, neutral and down positions. Saddle Tilted Down. If the saddle angle is pointed down too much then there will be unnecessary pressure on your knee and upper body. Your knees are. The Q-angle, lateral hypermobility, and J-sign are commonly used determined to determine patellar maltracking. The patellofemoral glide, tilt, and grind tests ( Clarke's sign ), when performed, can provide strong evidence for PFPS A) when the knee angle is small the quadriceps actually exerts a flexion moment on the tibia and the extension moment is provided by the ACL; and B) with increased knee flexion angle, the patellar tendon can now produce an extension moment of the tibia, conversely recruitment of the PCL produces a flexion moment

Tibiofemoral angles, patellar tilt, and patellar congruence angles were measured preoperatively and postoperatively. There were no patellar subluxations, dislocations, or complications related to the patellofemoral joint. Patellar tilt improved from 7.9° preoperatively to 3.8° postoperatively A patellar dislocation is a knee injury in which the patella (kneecap) slips out of its normal position. Often the knee is partly bent, painful and swollen. The patella is also often felt and seen out of place. Complications may include a patella fracture or arthritis.. A patellar dislocation typically occurs when the knee is straight and the lower leg is bent outwards when twisting Patellar mal-tracking, frequently associated with malposition of the tibial tubercle, often leads to the diagnosis of chondromalacia patella (softening of the articular individuals will demonstrate radiographic evidence of patellar subluxation or tilt (rotation); and, are the Q angle and the tubercle sulcus angle1. The Q angle is. Symptoms: A saddle angled downwards can cause knee pain and sore wrists and forearms. When the nose of your saddle is lower than the back, the tilt can cause problems. With the nose slanted forwards, your pelvis tilts meaning your hips will slide to the front of the saddle. Being forced to the nose of the saddle while pedalling can cause knee. I. Patella tilt - angle formed from a line parallel to the posterior condyles and a line through the transverse axis of patella. Normal is between 20-30 degrees. Image: Is the effectiveness of patellofemoral bracing modified by patellofemoral alignment and trochlear morphology? # orthonetwor patella alta TT-TG distance patellar tilt • Odds ratio for recurrent dislocations = 4.88 (95% CI 1.57-15.17) for pts who scored >4 compared to pts who scored <3 (p = 0.0064) Balcarek P, Oberthur S, Hopfensitz S, et al. Which patellae are likely to redislocate? Knee Surg Sports TraumatolArthrosc, 201