Validation of patient specific surgical guides in total hip arthroplasty

Abstract

The wide-base-contact PSG in resurfacing-THA and the PSG for neck-cut in THA could be applied clinically. Although cup-impaction PSG setting was acceptable, errors were made due to the impaction process during cup implantation.

Validation of patient‐specific surgical guides for femoral neck cutting in total hip arthroplasty through the anterolateral approach

“…The neck‐cut PSG had four metal sphere markers 2 mm in diameter for evaluation of PSG setting accuracy on the bone surface (Figure ). Preliminary experiments using the four 2 mm diameter metal spheres showed maximum errors of 0.25 mm, as visualized by CT with a 1.0 mm slice pitch …”

“…The cadavers included nine men and seven women (mean age, 63 years; range, 38–75 years; mean height, 170.0 cm; range, 163–180 cm; mean weight, 68 kg; range, 48–85 kg). All 32 fresh cadaveric hips were imaged from the entire pelvis to the femoral condyles using helical CT conducted with the Aquilion dynamic volume CT system (Toshiba Medical Systems, Tokyo, Japan) as previously described . Briefly, the legs were fully extended, and the feet were stabilized in a neutral position.…”

“…Patient‐specific surgical guides (PSGs) based on either computed tomography (CT) or magnetic resonance imaging data have been used to match the surface of bone models . PSGs were introduced as convenient surgical instruments for orthopaedic surgeries, including hip resurfacing and total hip arthroplasty (THA) . In THA, femoral neck cut is an important step.…”

“…The posterior aspect of the femoral neck has prominent concavities of the intertrochanteric crest; however, the anterior aspect has no such obvious concavities, but only the intertrochanteric bony line. A previous study indicated that neck‐cut PSG in THA through the posterior approach had good accuracy regarding PSG setting and femoral component implantation relative to the goals in preoperative three‐dimensional planning . However, there have been no reports on the validation of neck‐cut PSG in THA through the anterolateral‐approach (Figure ) or concerning the femoral component types, such as anatomical stem or taper‐wedge type.…”

Validation of Patient Specific Surgical Guide for Curved Periacetabular Osteotomy

“…Patient specific surgical guide (PSG) has been introduced as a convenient surgical instrument for osteotomy and arthroplasty [1,2]. The accuracy of PSG for pelvic osteotomy has been sporadically reported [3,4].…”