Assessing Reproducibility for Radiographic Measurement of Leg Length Inequality after Total Hip Replacement

McWilliams, Anthony; Grainger, Andrew J.; O’Connor, Philip; Redmond, Anthony; Stewart, Todd; Stone, Martin

doi:10.5301/hip.2012.9751

Cited by 21 publications

(17 citation statements)

References 38 publications

(24 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the Woolson method, the inter teardrop-lesser trochanter distance is used, while in the Willamson method, the transischial line-lesser trochanter distance is used. Other bony landmarks used include center of rotation of femoral head-lesser trochanter (CFR-LT method) and center of rotation of femoral head-teardrop-lesser trochanter (CFR-T-LT) (16). These methods have been validated in the literature (16,23).…”

Section: Discussionmentioning

confidence: 99%

“…This was done using the method described by McWilliams et al. (16). The stem length at the operated side was measured as the distance between the lesser trochanter and teardrop and the cup length as the distance between the teardrop and the center of rotation.…”

Section: Methodsmentioning

confidence: 99%

“…Patients whose operated leg became !10 mm longer compared with the contralateral side (n ¼ 41) were further studied to investigate the amount of lengthening that was related to the stem positioning (stem length) and to the cup positioning (cup length) compared with the contralateral side. This was done using the method described by McWilliams et al (16). The stem length at the operated side was measured as the distance between the lesser trochanter and teardrop and the cup length as the distance between the teardrop and the center of rotation.…”

Section: Measurement Of Postoperative Lld and Global Fomentioning

confidence: 99%

See 2 more Smart Citations

Leg lengthening and femoral-offset reduction after total hip arthroplasty: where is the problem – stem or cup positioning?

et al. 2017

View full text Add to dashboard Cite

Background Restoration of femoral offset (FO) and leg length is an important goal in total hip arthroplasty (THA) as it improves functional outcome. Purpose To analyze whether the problem of postoperative leg lengthening and FO reduction is related to the femoral stem or acetabular cup positioning or both. Material and Methods Between September 2010 and April 2013, 172 patients with unilateral primary osteoarthritis treated with THA were included. Postoperative leg-length discrepancy (LLD) and global FO (summation of cup and FO) were measured by two observers using a standardized protocol for evaluation of antero-posterior plain hip radiographs. Patients with postoperative leg lengthening ≥10 mm (n = 41) or with reduced global FO >5 mm (n = 58) were further studied by comparing the stem and cup length of the operated side with the contralateral side in the lengthening group, and by comparing the stem and cup offset of the operated side with the contralateral side in the FO reduction group. We evaluated also the inter-observer and intra-observer reliability of the radiological measurements. Results Both observers found that leg lengthening was related to the stem positioning while FO reduction was related to the positioning of both the femoral stem and acetabular cup. Both inter-observer reliability and intra-observer reproducibility were moderate to excellent (intra-class correlation co-efficient, ICC ≥0.69). Conclusion Post THA leg lengthening was mainly caused by improper femoral stem positioning while global FO reduction resulted from improper positioning of both the femoral stem and the acetabular cup.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Measurement Of Postoperative Lld and Global Fomentioning

confidence: 99%

See 1 more Smart Citation

Leg lengthening and femoral-offset reduction after total hip arthroplasty: where is the problem – stem or cup positioning?

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Any further surgical interventions or complications were recorded. On the pre and post operative X-ray, the leg length was measured to the nearest mm, using Woolson's validated X-ray technique which references the centre of femoral rotation, the acetabular teardrop and the midpoint of the lesser trochanter, 14,15 (Figure 4).…”

Section: Methodsmentioning

confidence: 99%

Revision surgery for leg length inequality after primary hip replacement

2018

View full text Add to dashboard Cite

show abstract

“…The authors have found the Leeds method to be similarly accurate for the measurement of LLI but with better repeatability than the two prominent methods in the literature (Figure 6). 20 The authors recommend that a lateral hip radiograph should also be obtained to check for any atypical bony anatomy in the hip or femoral shaft.…”

Section: Investigationsmentioning

confidence: 99%