The orientation of the distal part of the quadriceps femoris muscle as a function of the knee flexion-extension angle

Eijden, T.M.G.J. van; Boer, W. D. A. M. de; Weijs, W.A.

doi:10.1016/0021-9290(85)90055-7

Cited by 136 publications

(67 citation statements)

References 8 publications

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“…During landing, contraction of the knee extensor muscles generates a knee extensor moment which is vital to prevent the knee "collapsing" (Richards, et al, 1996;van Eijden, De Boer, & Weijs, 1985). This study reports no significant difference in sagittal lower extremity kinetics between landings from an unloaded and an approximate additional 10% body weight loaded jump-landings.…”

Section: Discussionmentioning

confidence: 60%

“…A shorter time to peak force (high LR), measured as LR vGRF, is associated with greater mechanical loads on the knee compared with a longer time to peak force (low LR), indicating lower force applied over a longer duration (van Eijden, et al, 1985). A high LR has been attributed to increased degeneration in anatomical structures such as the patellar tendon (Nigg & Bobbert, 1990).…”

Section: Discussionmentioning

confidence: 99%

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Lower Extremity Kinematics and Kinetics When Landing From Unloaded and Loaded Jumps

Janssen

Sheppard

Dingley³

et al. 2012

Journal of Applied Biomechanics

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Countermovement jumps loaded with a weighted vest are often used for the training of lower body power to improve jump performance. However, it is currently unknown how this added load affects the lower extremity kinematics and kinetics, in particular whether this results in an increased injury risk. Therefore, the purpose of this investigation was to determine how lower extremity kinematics and kinetics during landing are affected by loaded jumps as demonstrated in a volleyball block jump landing. Ten elite male volleyball players performed block jump landings in an unloaded and loaded (9.89 kg) condition. Kinematic and kinetic landing data from the three highest jumps were collected and assessed. Paired samplesttest was used to establish whether load condition had a significant effect on lower extremity kinematics and kinetics. Hip flexion was significantly greater in the unloaded condition compared with the loaded condition (p= .004). There was no significant difference in any other kinematic or kinetic variables measures between the unloaded and loaded conditions. These results suggest that landing from loaded volleyball block jumps does not increase injury risk compared with unloaded jumps in elite male volleyball players.

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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Lower Extremity Kinematics and Kinetics When Landing From Unloaded and Loaded Jumps

Janssen

Sheppard

Dingley³

et al. 2012

Journal of Applied Biomechanics

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show abstract

“…Figure 2 illustrates how the KFA was calculated for a point on the medial femoral condyle. The tibial long axis (TLAX) was defined by the posterior border of the proximal tibial diaphysis, 6 and the femoral long axis (FLAX) was defined by posterior border of the distal femoral diaphysis. 7 The transverse line passing through the superior border of inter-condylar notch drawn at the time of the surgery was considered to be at the site where Blumensaat's Line reached the condyle surface.…”

Section: Discussionmentioning

confidence: 99%

Localization of the full‐thickness cartilage lesions in medial and lateral unicompartmental knee osteoarthritis

Gulati

Chau

Beard

et al. 2009

Journal Orthopaedic Research

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This study's aim was to determine the patterns of osteoarthritis (OA) in both unicompartmental medial and lateral OA of the knee. Forty patients with medial and 20 with lateral unicompartmental knee osteoarthritis were studied to determine the location of fullthickness cartilage lesions. Intraoperatively, the distance between margins of the lesion and reference lines were measured. The femoral measurements were transposed onto lateral radiographs to determine the relationship between the lesion site and knee flexion angles. Both tibial and femoral lesions were significantly (p < 0.01) more posterior in lateral OA than medial OA. In medial OA, the lesion center was, on average, at 118 (SD 38) of flexion, whereas in lateral OA, it was at 408 (SD 38). The smallest medial femoral lesions were near full extension and, as they enlarged, they extended posteriorly. The smallest lateral femoral lesions extended from 208 to 608 flexion. As these lesions enlarged, they extended both anteriorly and posteriorly. There was a well-defined relationship between the site of the lesions and their size, suggesting that they develop and progress in a predictable manner. The relationship was different for medial and lateral OA, suggesting that different mechanical factors are important in initiating the different types of OA. The lesions in medial OA occur in extension, perhaps initiated by events occurring at heel strike. The lesions in lateral OA begin at flexion angles above those occurring during the single leg stance phase of the gait cycle, so activities other than gait are likely to induce lateral OA. ß

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“…At knee angles less than 45°to 60°the pull of the patella tendon is anterior, hence, a larger quadriceps contribution is thought to aggravate anterior knee instability at angles less than 45°. 24,56 However, the data of this subject suggest that the quadriceps contribution to the knee moment increases after the giving-way is initiated (2% to 6%), which is possibly a reaction to, and not the cause of, the giving-way event. A consequence of the larger knee extension moment is a higher joint compressive load, which some hypothesize may limit anterior instability and may have enhanced this subject's response to the giving-way event.…”

Section: 21mentioning

confidence: 81%

Self-Reported Giving-Way Episode During a Stepping-Down Task: Case Report of a Subject With an ACL-Deficient Knee

Houck¹,

Lerner²,

Gushue³

et al. 2003

J Orthop Sports Phys Ther

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Study Design: Case report. Objective: To describe the knee kinematics and moments of a giving-way trial of a subject with an anterior-cruciate-ligament-(ACL) deficient knee relative to his non-giving-way trials and to healthy subjects during a step-down task. Background: Episodes of giving way are believed to damage joint structures, therefore treatments aim to prevent giving-way episodes, yet few studies document giving-way events. Methods: The giving-way trial experienced by a 32-year-old male subject with ACL deficiency during a step-down task was compared to his non-giving-way trials (n = 5) and data from healthy subjects (n = 20). Position data collected at 60 Hz were combined with anthropometric data and ground reaction force data collected at 300 Hz to estimate knee displacement and 3-dimensional angles and net joint moments. Results: The knee joint displacement was higher during the giving-way trial: from 4% to 32% of stance, reaching 9.0 mm at 18% of stance as compared to 1.6 ± 0.7 mm for the non-giving-way trials. After 4% of stance, the knee flexion angle of the giving-way trial was 6.6°higher than the non-giving-way trials and was associated with a higher knee extension moment. The knee frontal plane moment was near neutral during early stance of the giving-way trial in contrast to the non-giving way and healthy subjects which demonstrated a knee abduction moment. Conclusions: The response of this subject to the giving-way event suggests that higher knee flexion angles may enhance knee stability and, in reaction to the giving-way event, that knee extension moment may increase.

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The orientation of the distal part of the quadriceps femoris muscle as a function of the knee flexion-extension angle

Cited by 136 publications

References 8 publications

Lower Extremity Kinematics and Kinetics When Landing From Unloaded and Loaded Jumps

Lower Extremity Kinematics and Kinetics When Landing From Unloaded and Loaded Jumps

Localization of the full‐thickness cartilage lesions in medial and lateral unicompartmental knee osteoarthritis

Self-Reported Giving-Way Episode During a Stepping-Down Task: Case Report of a Subject With an ACL-Deficient Knee

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