A mathematical model of the patellofemoral joint

Eijden, T.M.G.J. van; Kouwenhoven, E.; Verburg, J.; Weijs, W.A.

doi:10.1016/0021-9290(86)90154-5

Cited by 278 publications

(199 citation statements)

References 17 publications

Supporting

Mentioning

184

Contrasting

Unclassified

Order By: Relevance

“…5). This suggests that unlike human patellae, which appear to exclusively enhance knee extension velocity (at the expense of force), during the stance phase of running (Ellis et al ., 1980; Eijden et al ., 1986; Biewener et al ., 2004; data shown in Fig. 1 of this study), the patellae of running Numida have a more variable effect on the mechanics of knee extension.…”

Section: Discussionmentioning

confidence: 99%

“…Solid lines show data from Eijden et al . (1986), and all others show specimens from Ellis et al . (1980): Dotted lines show specimen #1, dashed lines show #2 and dash‐dots show specimen #4.…”

Section: Introductionmentioning

confidence: 87%

“…Patellar mechanical advantage has also been estimated using mathematical models based on bone positions and muscle–tendon lines of action taken from radiographs of the patellar complex, both ex vivo by Eijden et al . (1986) and in vivo by Alexander & Dimery (1985). …”

Section: Methodsmentioning

confidence: 98%

See 2 more Smart Citations

Gearing effects of the patella (knee extensor muscle sesamoid) of the helmeted guineafowl during terrestrial locomotion

et al. 2017

View full text Add to dashboard Cite

Human patellae (kneecaps) are thought to act as gears, altering the mechanical advantage of knee extensor muscles during running. Similar sesamoids have evolved in the knee extensor tendon independently in birds, but it is unknown if these also affect the mechanical advantage of knee extensors. Here, we examine the mechanics of the patellofemoral joint in the helmeted guineafowl Numida meleagris using a method based on muscle and tendon moment arms taken about the patella's rotation centre around the distal femur. Moment arms were estimated from a computer model representing hindlimb anatomy, using hip, knee and patellar kinematics acquired via marker‐based biplanar fluoroscopy from a subject running at 1.6 ms−1 on a treadmill. Our results support the inference that the patella of Numida does alter knee extensor leverage during running, but with a mechanical advantage generally greater than that seen in humans, implying relatively greater extension force but relatively lesser extension velocity.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 87%

See 1 more Smart Citation

Gearing effects of the patella (knee extensor muscle sesamoid) of the helmeted guineafowl during terrestrial locomotion

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The C was described in relation to kf using a curve fitting technique based on the non-linear equation described by van Eijden et al (1986): PTS (MPa) was calculated using the net PTCF divided by the patellofemoral contact area. The contact area was described using the Ho et al (2012) recommendations by fitting a 2nd order polynomial curve to the data of Powers, Lilley, and Lee (1998) showing patellofemoral contact areas at varying levels of kf.…”

Section: Data Processingmentioning

confidence: 99%

Effects of prophylactic knee bracing on knee joint kinetics and kinematics during netball specific movements

Sinclair

Vincent

Richards

2017

Physical Therapy in Sport

View full text Add to dashboard Cite

ObjectiveTo investigate the effects of a prophylactic knee brace on knee joint kinetics and kinematics in netball specific movements. DesignRepeated measures; Setting: Laboratory; Participants: Twenty university first team level female netball players. Outcome measurementsParticipants performed three movements, run, cut and vertical jump under two conditions (brace and no-brace). 3-D knee joint kinetics and kinematics were measured using an eight-camera motion analysis system. Knee joint kinetics and kinematics were examined using 2 × 3 repeated measures ANOVA whilst the subjective ratings of comfort and stability were investigated using chi-squared tests. ResultsThe results showed no differences (p > 0.05) in knee joint kinetics. However the internal/external rotation range of motion was significantly (p < 0.05) reduced when wearing the brace in all movements. The subjective ratings of stability revealed that netballers felt that the knee brace improved knee stability in all movements. ConclusionsFurther study is required to determine whether reductions in transverse plane knee range of motion serve to attenuate the risk from injury in netballers.

show abstract

“…1,3,[9][10][11][12][13][15][16][17] However there is a lack of evidence regarding the fact whether patellar eversion really leads to shortening of the patellar tendon. The present study is aimed to focus on whether a standard medial parapatellar knee arthrotomy with eversion of patella, leads to patella baja by shortening of the patellar tendon, and to estimate its incidence.…”

Section: Introductionmentioning

confidence: 99%

Incidence of patella baja following patellar eversion in total knee arthroplasty

et al. 2017

View full text Add to dashboard Cite

Background: Patella baja is a rare complication of total knee arthroplasty (TKA) leading to decreased mechanical advantage of the extensor mechanism, decreased knee range of motion, anterior knee pain and increased wear of the tibial and patellar polyethylene. There exists a lack of evidence on whether patellar eversion leads to shortening of the patellar tendon. The present study aims to determine if eversion of patella during TKA leads to patella baja.Methods: Between August 2014 and August 2016, 55 knees undergoing primary TKA with a standard medial parapatellar arthrotomy and eversion of patella were included in this two point cross sectional study. Preoperative X-rays were taken to assess the length of the patellar tendon and Insall Salvati ratio (ISR). Postoperatively the Blackburne Peel Index (BPI), ISR and patellar tendon lengths were assessed on lateral X-rays to look for any incidence of patella baja.Results: The postoperative change in the length of the patellar tendon was unpredictable; though most of them decreased. The pre and post op difference in the length of patellar tendon was statistically significant in females (4.43±0.20 cm vs. 4.35±0.24 cm; p value-0.005). Significant decrease in length of patellar tendon was seen in patients aged 66-70 years (p= 0.024) and patients with BMI >30 kg/m2. No case of true patella baja was found postoperatively. No significant correlation could be established between ISR and age, sex or BMI of the patients.Conclusions: The different risk factors for post TKA shortening of patellar tendon include female gender and higher BMI (>30 Kg/m²). However eversion of patella during TKA may not lead to an increased incidence of true patella baja.

show abstract

A mathematical model of the patellofemoral joint

Cited by 278 publications

References 17 publications

Gearing effects of the patella (knee extensor muscle sesamoid) of the helmeted guineafowl during terrestrial locomotion

Gearing effects of the patella (knee extensor muscle sesamoid) of the helmeted guineafowl during terrestrial locomotion

Effects of prophylactic knee bracing on knee joint kinetics and kinematics during netball specific movements

Incidence of patella baja following patellar eversion in total knee arthroplasty

Contact Info

Product

Resources

About