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Restoring femoral offset and leg length; the potential of a short curved stem in total hip arthroplasty.

ABSTRACT: Background:Total hip arthroplasty (THA) is a very successful procedure in orthopedics. Still polyethylene wear and gait deficits are limiting the clinical success.It is important to reconstruct leg length (LL) and femoral offset (FO) anatomically in order to have the best possible result of a THA. Gait deficits can arise due to leg length discrepancy as well as changes in the abductor moment arm. In THA, LL and FO are strongly determined by the orientation, size and geometry of the femoral stem. Methods:This radio-anatomical study used the data of a prospective cases series of 112 patients who underwent 126 primary THAs and had completed a 1-year follow-up examination. FO and LL were compared between the conventional straight stem in vivo and a computed simulated implantation of a short curved stem, using the pre- and postoperative pelvic radiographs of the same patients. Results:In this simulation of the short curved stem statistically significantly restored native FO (p?=?0.010) and LL (p?=?0.000) better, compared to the conventional straight stem. Conclusions:Thus, the short curved stem restores FO and LL better, and could potentially prevent gait deficits.

SUBMITTER: Snijders TE

PROVIDER: S-EPMC6512581 | biostudies-literature | 2019 Sep-Oct

REPOSITORIES: biostudies-literature

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Restoring femoral offset and leg length; the potential of a short curved stem in total hip arthroplasty.

Snijders Thom E TE van Erp Joost H J JHJ de Gast Arthur A

Journal of orthopaedics 20190502 5

<h4>Background</h4>Total hip arthroplasty (THA) is a very successful procedure in orthopedics. Still polyethylene wear and gait deficits are limiting the clinical success.It is important to reconstruct leg length (LL) and femoral offset (FO) anatomically in order to have the best possible result of a THA. Gait deficits can arise due to leg length discrepancy as well as changes in the abductor moment arm. In THA, LL and FO are strongly determined by the orientation, size and geometry of the femor ...[more]

PMID: 31110402

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Project description:BackgroundLeg-length discrepancy (LLD) after primary THA is not uncommon. Little is known, however, about the role of hip-sparing procedures for equalization of LLD after THA.Questions/purposesThe aim of this study is to report our experiences with these techniques in patients presenting at one institution over a 10-year period.MethodsWe retrospectively reviewed records at one institution to find patients who had sought surgical treatment for LLD after THA between January 2007 and August 2017. Patients who had LLD related to conditions other than the THA, such as bone loss or traumatic defects, were excluded. We recorded the time after THA, laterality, and LLD. Assessment of LLD was performed using clinical and radiographic examinations. Patient demographics and true LLD were recorded, as were prior conservative treatment, equalization procedure performed, final leg length after equalization surgery, time to healing, and complications.ResultsAfter exclusion of patients with LLD related to other causes, eight patients in whom conservative treatment had failed and who had undergone hip-sparing leg-length equalization surgery were included in the study. The average age was 44.6 years (range, 18 to 66 years). Seven of the patients were female. The pre-operative mean LLD was 3.1 cm (range 1.5 to 7 cm). In those who were long after THA, ipsilateral (THA-side) shortening of femur with a retrograde intramedullary nail (IMN; n = 1) or with a plate (n = 1) was performed. In those who were short after THA, ipsilateral femur lengthening with retrograde Precice nails (n = 2), ipsilateral tibial lengthening with Precice nails (n = 2), or contralateral femur shortening with a retrograde IMN (n = 2) was performed. The average time to full consolidation or union was 6.6 months (range, 2 to 19 months). Two patients had delayed union. All patients but one were satisfied with final results.ConclusionWe believe that hip-sparing equalization procedures can be part of the treatment algorithm of LLD after THA. These advancements in the field are promising and might expand the indications of lengthening and equalization procedures to include LLD after THA.

Dataset Information

Restoring femoral offset and leg length; the potential of a short curved stem in total hip arthroplasty.

Publications

Restoring femoral offset and leg length; the potential of a short curved stem in total hip arthroplasty.

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