A comparison of the accuracy of several hip center location prediction methods

Bell, Alexander L.; Pedersen, Douglas R.; Brand, Richard A.

doi:10.1016/0021-9290(90)90054-7

Cited by 707 publications

(463 citation statements)

References 12 publications

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“…The locations of the markers on the lateral and medial tibial condyles and medial malleoli relative to the tibia were obtained from the locations of all the reflection markers in the static standing trial. The locations of hip centers were estimated as described by Bell et al [3]. The knee center was defined as the middle point between the medial and lateral tibial condyles.…”

Section: Methodsmentioning

confidence: 99%

Effects of a Knee Extension Constraint Brace on Lower Extremity Movements after ACL Reconstruction

Stanley

Creighton

Gross

et al. 2011

Clinical Orthopaedics &Amp; Related Research

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Background Patients have high reinjury rates after ACL reconstruction. Small knee flexion angles and large peak posterior ground reaction forces in landing tasks increase ACL loading. Questions/purposes We determined the effects of a knee extension constraint brace on knee flexion angle, peak posterior ground reaction force, and movement speed in functional activities of patients after ACL reconstruction. Patients and Methods Six male and six female patients 3.5 to 6.5 months after ACL reconstruction participated in the study. Three-dimensional videographic and force plate data were collected while patients performed level walking, jogging, and stair descent wearing a knee extension constraint brace, wearing a nonconstraint brace, and not wearing a knee brace. Knee flexion angle at initial foot contact with the ground, peak posterior ground reaction force, and movement speed were compared across brace conditions and between genders. Results Wearing the knee extension constraint brace increased the knee flexion angle at initial foot contact for each activity when compared with the other two brace conditions. Wearing the knee extension constraint brace also decreased peak posterior ground reaction force during walking but not during jogging and stair descent. Conclusions Although the knee extension constraint brace did not consistently reduce the peak posterior ground reaction force in all functional activities, it consistently increased knee flexion angle and should reduce ACL loading as suggested by previous studies. These results suggest the knee extension constraint brace has potential as a rehabilitation tool to alter lower extremity movement patterns of patients after ACL reconstruction to address high reinjury rates. Level of Evidence Level II, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.

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Section: Methodsmentioning

confidence: 99%

Effects of a Knee Extension Constraint Brace on Lower Extremity Movements after ACL Reconstruction

Stanley

Creighton

Gross

et al. 2011

Clinical Orthopaedics &Amp; Related Research

View full text Add to dashboard Cite

show abstract

“…There are two main studies in the literature relating the x-, y-, and z-coordinates of the hip center to pelvic dimensions [3,26]. Both studies involved manual measurements on cadaveric pelves with one relating the three coordinates to pelvic width only [3] and the other also relating them to their three corresponding pelvic dimensions [26]. It is difficult to make direct comparisons between our results and the results obtained in those studies because pelvic dimensions were defined differently ( Fig.…”

Section: Discussionmentioning

confidence: 92%

“…This may be particularly useful when there are extensive osteophytes or in cases involving complex revision surgery, dysplasia, or protrusio. There are two main studies in the literature relating the x-, y-, and z-coordinates of the hip center to pelvic dimensions [3,26]. Both studies involved manual measurements on cadaveric pelves with one relating the three coordinates to pelvic width only [3] and the other also relating them to their three corresponding pelvic dimensions [26].…”

Section: Discussionmentioning

confidence: 99%

“…The difference in the x-coordinate (C x ) may be related to the way the hip center was identified. In the two published studies [3,26], this was accomplished by manually estimating the center of the bony acetabular rim as opposed to 3-D CT measurement used in our study. Using the acetabular rim center as the hip center makes the assumption that the acetabulum is a hemisphere with a smooth rim.…”

Section: Discussionmentioning

confidence: 99%

“…Unlike acetabular angular orientation, few studies describe accurate methods of defining the acetabular center position in three-dimensional (3-D) space [3,14,20]. Predictive methods involve localizing the center in relation to palpable bony landmarks with the position calculated using pelvic dimensions [1,20,26].…”

Section: Introductionmentioning

confidence: 99%

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Can the Acetabular Position be Derived from a Pelvic Frame of Reference?

Dandachli

Nakhla

Iranpour

et al. 2008

Clin Orthop Relat Res

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Acetabular center positioning has an effect on hip function. However, reported clinical and plain radiographic methods are inaccurate and unreliable for ascertaining acetabular implant location. In an exploratory study we asked whether the normal acetabular position can be derived from simple radiographically measurable pelvic dimensions. We analyzed computed tomographic scans of 37 normal hips using a pelvic frame of reference centered on the ipsilateral anterior-superior iliac spine. We defined the x-, y-, and z-coordinates of the hip center (C x ,C y ,C z ) as a percentage of the corresponding pelvic dimensions (D x ,D y ,D z ). C x /D x averaged 9%, C y /D y 34%, and C z /D z 37%. These ratios had narrow distributions with small confidence intervals. Interobserver agreement tests showed a mean intraclass correlation coefficient of 0.95. We observed gender differences in the ratios of as much as 4%, which correspond to differences of as much as 9 mm in the hip center position. The ratios provide a simple and reliable way of deriving the normal position of the hip center from the pelvic dimensions alone. This gives the surgeon a simple way of planning where the hip center should be and may be particularly helpful in revision hip arthroplasty or in cases involving extensive osteophytes, dysplasia, or protrusio.

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References

2011

Mathematical and Computational Methods in Biomechanics of Human Skeletal Systems

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A comparison of the accuracy of several hip center location prediction methods

Cited by 707 publications

References 12 publications

Effects of a Knee Extension Constraint Brace on Lower Extremity Movements after ACL Reconstruction

Effects of a Knee Extension Constraint Brace on Lower Extremity Movements after ACL Reconstruction

Can the Acetabular Position be Derived from a Pelvic Frame of Reference?

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