Does hip joint positioning affect maximal voluntary contraction in the gluteus maximus, gluteus medius, tensor fasciae latae and sartorius muscles?

Background: Minimally invasive total hip arthroplasty (THA) is presumed to provide functional and clinical benefits, whereas in fact the literature reveals that gait and posturographic parameters following THA do not recover values found in the general population. There is a significant disturbance of postural sway in THA patients, regardless of the surgical approach, although with some differences between approaches compared to controls: the anterior and anterolateral minimally invasive approaches seem to be more disruptive of postural parameters than the posterior approach. Electromyographic (EMG) study of the hip muscles involved in surgery [gluteus maximus (GMax), gluteus medius (GMed), tensor fasciae latae (TFL), and sartorius (S)] could shed light, the relevant literature involves discordant methodologies.

Short-term comparison of postural effects of three minimally invasive hip approaches in primary total hip arthroplasty: Direct anterior, posterolateral and Röttinger.

Introduction: There is renewed interest in total hip arthroplasty (THA) with the development of minimally invasive approaches. The anterior and Röttinger approaches are attractive for their anatomical and minimally invasive character, but with no comparative studies in the literature definitely suggesting superiority in terms of quality of functional recovery. We therefore performed a case-control study, assessing: 1) whether the postural parameters of patients operated on with the anterior, Röttinger and posterior minimally invasive approaches were similar to those of asymptomatic subjects, and 2) whether there were any differences in postural parameters between the three approaches at short-term follow-up.

Primary unconstrained shoulder arthroplasty in patients with a fixed anterior glenohumeral dislocation.

Background: Reports of shoulder arthroplasty for the treatment of fixed glenohumeral dislocation are rare. The purpose of this study was to analyze the results following shoulder arthroplasty in patients with a fixed anterior shoulder dislocation.

Methods: Eleven patients were evaluated at a minimum of twenty-four months after they underwent an arthroplasty for the treatment of a fixed anterior shoulder dislocation.

[Shoulder arthroplasty for osteoarthritis after prior surgery for anterior instability: a report of 27 cases].

Purpose Of The Study: The purpose of this study was to analyze the natural history of shoulder osteoarthritis secondary to prior surgery for anterior instability, to evaluate clinical and radiological results of shoulder prosthesis, and to compare results with reports in the literature.

Material And Methods: Twenty-seven shoulder prostheses (Aequalis) were implanted in patients with osteoarthritis of the shoulder after prior instability surgery. These shoulders were reviewed retrospectively at a mean follow-up of 46 months (range 24-48).

Shoulder arthroplasty in patients with a prior anterior shoulder dislocation. Results of a multicenter study.

Background: Prior reports of shoulder arthroplasty performed for dislocation-induced arthropathy have included only patients who had had a prior stabilizing procedure. The purpose of this study was to report the results of shoulder arthroplasty in all patients with a prior anterior shoulder dislocation, including both those previously treated operatively and those previously treated nonoperatively.

Methods: Fifty-five shoulders undergoing arthroplasty for arthritis following a prior anterior shoulder dislocation were evaluated.