Three-dimensional limb lengthening after total knee arthroplasty in a simulation study

Ohmori, Takaaki; Kabata, Tamon; Kajino, Yoshitomo; Inoue, Dai; Taga, Tadashi; Yamamoto, Takashi; Takagi, Tomoharu; Yoshitani, Junya; Ueno, Takuro; Ueoka, Ken; Tsuchiya, Hiroyuki

doi:10.1080/14397595.2018.1436119

Cited by 7 publications

(7 citation statements)

References 31 publications

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“…In their study, leg lengthening occurred frequently after TKA along with the correction of coronal deformities. In the laboratory study of Ohmori et al, 27 authors reported that correction of coronal alignment and flexion contracture could induce leg lengthening after TKA. This study suggested that leg length increases after TKA denote restoration of the coronal limb alignment and flexion contracture.…”

Section: Discussionmentioning

confidence: 99%

Total Knee Arthroplasty after Previous Ipsilateral Hip Arthroplasty Showed Lower Clinical Outcomes and Higher Leg Length Discrepancy Perception

et al. 2020

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The purpose of this study is to compare perception of leg length discrepancy (LLD) and clinical results of total knee arthroplasties (TKA) in patients with or without previous ipsilateral hip arthroplasty. Between 2008 and 2015, navigation-assisted TKA was performed in 43 patients with previous hip arthroplasty after hip fracture. After 1:3 propensity score matching was performed, 108 patients of primary navigation-assisted TKA (group 1) and 36 patients with hip arthroplasty (group 2) were included. Knee Society (KS) scores, Western Ontario and McMaster Universities Index (WOMAC) scores, and patients' satisfaction including perception of LLD were evaluated. Radiographic evaluation included mechanical axis, component position, and LLD. Logistic regression analysis was performed to find the factors that affect the clinical outcomes. No significant differences in radiologic and clinical evaluations, except for KS function score, patient's satisfaction and LLD (p< 0.001), were detected between the groups. LLD and its perception were significantly higher in group 2 (1.8 ± 3.4 mm in group 1 and 9.7 ± 4.1 mm in group 2, p = 0.000). Risk factors for the low KS function score were found as LLD (odds ratio [OR]: 1.403, p = 0.008) and previous hip arthroplasty itself (OR: 15.755, p = 0.002), but much higher OR was found in previous hip arthroplasty. Although the outcomes of TKA in patients with ipsilateral hip arthroplasty are comparable to those of primary TKA, LLD was high and patient's satisfaction and functional outcomes were low in patients with previous ipsilateral hip arthroplasty. Care should be taken when considering TKA in patients with previous hip arthroplasty. This is a Level III, case control study.

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Section: Discussionmentioning

confidence: 99%

Total Knee Arthroplasty after Previous Ipsilateral Hip Arthroplasty Showed Lower Clinical Outcomes and Higher Leg Length Discrepancy Perception

et al. 2020

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“…A sports model system based on three-dimensional images usually includes three parts, namely, a transmitting source, a receiving sensor, and a data processing unit. The emission source is used to generate an electromagnetic field, and the distribution of the electromagnetic field is regular; the key parts of the athlete's body need to be equipped with receiving sensors (usually [10][11][12][13][14][15][16][17][18][19][20], and the connection between the sensors and the data processing unit is achieved through cables. In order to reduce interference and jitter, the sampling rate of this type of system is generally lower than 15 Hz, and for some high-speed sports such as football and basketball, such a sampling rate is far from meeting the requirements.…”

Section: Wireless Communications and Mobile Computingmentioning

confidence: 99%

“…Because several traditional 3D image-based sports model technologies require the athletes to wear hardware devices or stick markers on their bodies and some also require athletes to wear special clothing, it is very inconvenient to recognize or interact with actions. In addition, these systems are often more expensive and require a special site, so it is difficult to achieve in general applications [10].…”

Section: Introductionmentioning

confidence: 99%

Research and Implementation of the Sports Analysis System Based on 3D Image Technology

Wang

Gao

Liu

2021

Wireless Communications and Mobile Computing

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On the basis of existing research, this paper analyzes the algorithms and technologies of 3D image-based sports models in depth and proposes a fusion depth map in view of some of the shortcomings of the current hot spot sports model methods based on 3D images. We use the 3D space to collect the depth image, remove the background from the depth map, recover the 3D motion model from it, and then build the 3D model database. In this paper, based on the characteristics of continuity in space and smoothness in time of a rigid body moving target, a reasonable rigid body target motion hypothesis is proposed, and a three-dimensional motion model of a rigid body target based on the center of rotation of the moving target and corresponding motion is designed to solve the equation with parameters. In the case of unknown motion law, shape, structure, and size of the moving target, this algorithm can achieve accurate measurement of the three-dimensional rigid body motion target’s self-rotation center and related motion parameters. In the process of motion parameter calculation, the least square algorithm is used to process the feature point data, thereby reducing the influence of noise interference on the motion detection result and correctly completing the motion detection task. The paper gives the measurement uncertainty of the stereo vision motion measurement system through simulated and real experiments. We extract the human body motion trajectory according to the depth map and establish a motion trajectory database. For using the recognition algorithm of the sports model based on the 3D image, we input a set of depth map action sequences. After the above process, the 3D motion model is obtained and matched with the model in the 3D motion model database, and the sequence with the smallest distance is calculated. The corresponding motion trajectory is taken as the result of motion capture, and the efficiency of this system is verified through experiments.

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“…Reestablishing appropriate limb length and stability is among the most important goals in lower extremity total joint arthroplasty (TJA) [1,3,4,6,11,14,[16][17][18][19]. Patients' perceived and true leg length discrepancy (LLD) can be multifactorial, including contributions from soft tissue contractures, pelvic obliquity, spinal deformity, and acetabular or femoral anatomy [14,17,19], accounting for leg length as an important element of a total hip arthroplasty (THA) [1,6,16,17,19].…”

Section: Introductionmentioning

confidence: 99%

“…Leg length can be measured as functional length, the top of the femoral head to the center of the ankle (Figures 1 and 2), or anatomical length, the top of the femoral head to the center of the knee between the condyles plus the length from the center of the condyles to the center of the ankle. A limb with a significant knee deformity and varus or valgus mechanical axis deviation is functionally shortened and can therefore be functionally lengthened along the limb axis with deformity correction to a neutral mechanical axis at the time of TKA [3,4,11,18]. Furthermore, ligament balancing to achieve intraoperative stability can affect both functional and anatomical leg length [3][4][5][9][10][11]13,18).…”

Section: Introductionmentioning

confidence: 99%

Characterizing the Magnitude of and Risk Factors for Functional Limb Lengthening in Patients Undergoing Primary Total Knee Arthroplasty

et al. 2021

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Background: There is little data on the magnitude and factors for functional leg lengthening after primary total knee arthroplasty (TKA). Questions/Purpose: We sought to determine the incidence of and risk factors for functional leg lengthening after primary TKA. Methods: We retrospectively reviewed consecutive unilateral primary TKAs at a single institution from 2015 to 2018. Of the 782 TKAs included, 430 (55%) were performed in women; the mean age was 66 years, and the mean body mass index was 29 kg/m2. Preoperatively, 541 (69%) knees were varus deformities and 223 (29%) were valgus deformities. Hip to ankle biplanar radiographs were obtained preoperatively and 6 weeks postoperatively for all patients. Two independent researchers measured leg length, coronal plane deformity, lateral knee flexion angle, and overall mechanical alignment on all preoperative and postoperative radiographs. Results: The mean overall ipsilateral functional leg lengthening was 7.0 mm. Seven hundred knees (90%) were overall functionally lengthened, including 462 (59%) knees lengthened >5 mm and 250 (31%) knees lengthened 10 mm or more. A valgus deformity and coronal plane deformity of 10° or more were significant risk factors for increased functional lengthening. Patients with severe valgus deformities (>10°) had the largest amount of functional lengthening, at a mean of 13.5 mm. Conclusion: After primary TKA, 90% of limbs are functionally lengthened, including roughly one-third over a centimeter. Valgus knee deformities and severe deformities (>10°) were significant risk factors for increased limb lengthening.

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Three-dimensional limb lengthening after total knee arthroplasty in a simulation study

Abstract: The expected limb lengthening when performing measured-resection TKA is expressed as 0.58 × (the degree of HKA improvement + the degree of flexion contracture angle improvement) mm and is a useful index.

Cited by 7 publications

References 31 publications

Total Knee Arthroplasty after Previous Ipsilateral Hip Arthroplasty Showed Lower Clinical Outcomes and Higher Leg Length Discrepancy Perception

Total Knee Arthroplasty after Previous Ipsilateral Hip Arthroplasty Showed Lower Clinical Outcomes and Higher Leg Length Discrepancy Perception

Research and Implementation of the Sports Analysis System Based on 3D Image Technology

Characterizing the Magnitude of and Risk Factors for Functional Limb Lengthening in Patients Undergoing Primary Total Knee Arthroplasty

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