Insufficient lateral stem contact is an influencing factor for significant subsidence in cementless short stem total hip arthroplasty.

Background: Subsidence is one of the concerning early complications in cementless femoral stem. Few publications have studied the influencing factors for subsidence in short cementless stems, due to their metaphyseal anchoring without diaphyseal invasion, they might demonstrate different subsidence patterns than with the conventional stems.

Aim: To analyze the factors associated with significant subsidence in short stems, including any radiographic parameters.

Mid-term results of short stem total hip arthroplasty in patients with osteonecrosis of the femoral head.

Purpose: To evaluate the clinical and radiographic mid-term results of short-stem total hip arthroplasty (THA) in patients with osteonecrosis of the femoral head (ONFH).

Methods: We reviewed 83 cases that underwent Metha stem between November 2010 and November 2012. The appearance of bone trabeculae development and radiolucent line were reviewed and HHS was recorded at 6 months postoperatively then yearly to evaluate the clinical results.

Deviation of cup alignment from target angle during press-fit insertion.

Background: Several factors lead to cup malalignment including preoperative pelvic tilt, inaccurate pelvic position on the operating table, pelvic movement during the operation and alignment change after screw fixation of the cup. There are few studies about the deviation of cup alignment from target angle during press-fit insertion, which may be the other cause of cup malalignment. The purpose of this study was to evaluate the deviation of cup alignment from target angle during press-fit insertion by using imageless navigation and to define any influential factors, including gender, age and side of operation.

Precision of Limb Length Measurement in Imageless Navigation THA with Modified Registration Technique in Semilateral Decubitus Position.

Background: Limb length discrepancy (LLD) following total hip arthroplasty (THA) can be a significant problem and leading to patient dissatisfaction. Several researchers have reported that imageless navigation is a reliable technique and results in more precise cup placement compared to conventional freehand techniques, however, few studies have been reported about the accuracy of the femoral stem placement.

Objective: (1) To evaluate the precision of an imageless navigation system in measuring the limb length change and (2) to evaluate LLD following imageless navigation THA with modified registration technique in semilateral decubitus position.

The Short Stem THA Provides Promising Results in Patients with Osteonecrosis of the Femoral Head.

Background: The short stem prosthesis showed good results in patients with primary osteoarthritis. However there were afew studies about the short stem total hip arthroplasty (THA) in patients with osteonecrosis of thefemoral head (ONFH).

Objective: To evaluate the clinical and radiographic results of the short stem THA in patients with ONFH.

Initial clinical and radiographic results with the short stem THA.

Background: The patient who suitable for short stem THA must has good neck quality for initial stable fixation. In Thailand, the majority of patients are end stage osteonecrosis and have relatively narrow neck diameter so it's may be increased risk of intraoperative femoral fractures and leading to stem failure.

Objective: Evaluate the initial clinical and radiographic results of short stem THA over a maximum follow-up period of about 24 months, paying special attention to early problem.