Comparison of hip force calculations and measurements in the same patient

Brand, Richard A.; Pedersen, Douglas R.; Davy, Dwight T.; Kotzar, G. M.; Heiple, Kingsbury G.; Goldberg, Victor M.

doi:10.1016/0883-5403(94)90136-8

Cited by 207 publications

(139 citation statements)

References 17 publications

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“…The abductor muscle moment has been used frequently as a primary parameter for characterizing hip loading [1,11,18,21,24], and a cycle-to-cycle comparison of in vivo measured and calculated hip contact forces and moments showed good agreement [7]. However, computation of joint loading is a complex overdetermined mathematical problem and many loadings can satisfy a given computed moment [2], and therefore, resultant intersegmental moment does not necessarily represent the actual hip loading. Nevertheless, our findings of no changes in the hip abductor lever arm ratio and the hip abductor moment after surgery may suggest the abductor lever arm was not effectively lengthened even after trochanteric advancement.…”

Section: Discussionmentioning

confidence: 99%

Trochanteric Advancement in Patients with Legg-Calvé-Perthes Disease Does Not Improve Pain or Limp

Joo

Lee

Koh

et al. 2008

Clinical Orthopaedics &Amp; Related Research

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Premature closure of the proximal epiphysis in patients with Legg-Calvé-Perthes disease can cause overgrowth of the greater trochanter. We asked whether distal transfer of the greater trochanter relieved pain and improved limp and whether the operation changed frontal plane kinematic and kinetic parameters of the hip and pelvis in the gait analysis. We reviewed 15 patients (15 hips) with an average age of 16.9 years (range, 13-26 years) who had the operation and were followed for a minimum of 28 months (average, 42 months; range, 28-54 months). The Iowa hip score increased from 85.0 (range, 75.5-87.0) before surgery to 89.1 (range, 83.0-97.0) at the final followup. Only three patients had no pain and Trendelenburg sign postoperatively. Pelvic obliquity angle of affected and contralateral normal hips in ipsilateral stance and contralateral swing phases remained unchanged after surgery. Hip adduction angle and abductor moment during single stance phase of affected and contralateral normal hips were not changed. We concluded trochanteric advancement does little to relieve pain and improve limp in patients with relative overgrowth of the greater trochanter and Legg-Calvé-Perthes disease.

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Section: Discussionmentioning

confidence: 99%

Trochanteric Advancement in Patients with Legg-Calvé-Perthes Disease Does Not Improve Pain or Limp

Joo

Lee

Koh

et al. 2008

Clinical Orthopaedics &Amp; Related Research

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“…Direct measurement of joint forces in vivo has been challenging because of issues with miniaturization of electronics, remote powering, long-term durability of electronic components, and safety of the implant design. Hip forces measured through telemetry typically have been lower by 160% to 400% than those predicted mathematically [4,5]. The knee is difficult to model accurately because of its complex geometry, six degrees of freedom, and the major role soft tissues play in stabilizing and directing knee function.…”

Section: Introductionmentioning

confidence: 99%

The 2011 ABJS Nicolas Andry Award: ‘Lab’-in-a-Knee: In Vivo Knee Forces, Kinematics, and Contact Analysis

D’Lima

Patil

Steklov

et al. 2011

Clinical Orthopaedics &Amp; Related Research

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Background Tibiofemoral forces are important in the design and clinical outcomes of TKA. We developed a tibial tray with force transducers and a telemetry system to directly measure tibiofemoral compressive forces in vivo. Knee forces and kinematics traditionally have been measured under laboratory conditions. Although this approach is useful for quantitative measurements and experimental studies, the extrapolation of results to clinical conditions may not always be valid. Questions/purposes We therefore developed wearable monitoring equipment and computer algorithms for classifying and identifying unsupervised activities outside the laboratory. Methods Tibial forces were measured for activities of daily living, athletic and recreational activities, and with orthotics and braces, during 4 years postoperatively. Additional measurements included video motion analysis, EMG, fluoroscopic kinematic analysis, and ground reaction force measurement. In vivo measurements were used to evaluate computer models of the knee. Finite element models were used for contact analysis and for computing knee kinematics from measured knee forces. A thirdgeneration system was developed for continuous monitoring of knee forces and kinematics outside the laboratory using a wearable data acquisition hardware. Results By using measured knee forces and knee flexion angle, we were able to compute femorotibial AP translation (À12 to +4 mm), mediolateral translation (À1 to 1.5 mm), axial rotation (À3°to 12°), and adduction-abduction (À1°t o +1°). The neural-network-based classification system was able to identify walking, stair-climbing, sit-to-stand, and stand-to-sit activities with 100% accuracy. Conclusions Our data may be used to improve existing in vitro models and wear simulators, and enhance prosthetic designs and biomaterials.

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“…In large-scale musculoskeletal models, validity of muscle force estimates has been assessed indi rectly by comparing measured joint reaction forces against those predicted by modeling. Brand et al (1994) compared hip forces predicted by a musculoskeletal model to direct measurements from an instrumented hip implant. They reported that muscle forces were apparently overestimated due to the lack of realistic wrapping of muscle paths around the hip joint, making moment arms smaller than they should have been.…”

Section: Validationmentioning

confidence: 99%