Details

Autor(en) / Beteiligte

• Bechler, Ulrich
• Springer, Bernhard
• Rueckl, Kilian
• Rolvien, Tim
• Boettner, Friedrich

Titel

Can a simple iPad app improve C-arm based component position in anterior THA?

Ist Teil von

• Archives of orthopaedic and trauma surgery, 2021-08, Vol.141 (8), p.1401-1409

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2021

Link zum Volltext

Quelle

SpringerLink (Online service)

Beschreibungen/Notizen

• Introduction Correct acetabular component positioning improves hip biomechanics, impingement free range of motion and may lead to a reduced risk of postoperative dislocation. The C-arm is a simple and cost-effective tool for THA in a supine position, however, evaluation of the images can be challenging due to parallax. The current study aimed to investigate whether a software app-based measurement technique can control acetabular component position and leg length in anterior THA. Materials and methods Ninety-three patients with end-stage osteoarthritis aged 65.2 ± 9.6 years (range 30–86 years) were included in this prospective study. All patients underwent direct anterior THA using a Hana orthopedic surgery table. C-arm imaging and an iPad software app were used to determine intraoperative acetabular anteversion, inclination and leg length discrepancy. The app provides a measuring tool that is applied to intraoperative c-arm images. The intraoperative measurements were compared to the measurements of standard postoperative AP-pelvis radiographs. Results Intraoperative software app-based anteversion measurements averaged 20.5° (range 16.0° to 24.0°) compared to 20.9° (range 14.7° to 25.6°) postoperatively. Mean intraoperative inclination was 40.5° (range 35° to 48°) compared to postoperative 40.7° (range 35° to 49°). Mean intraoperative leg length discrepancy was 0.9 mm (range – 4–5 mm) compared to postoperative 0.6 mm (range – 5–6 mm). A strong Pearson’s correlation was observed between the intraoperative and postoperative measurements for anteversion ( r  = .701; P  < .0001), inclination ( r  = .816; P  < .0001) and leg length discrepancy ( r  = .542; P  < .0001). Conclusions The software app used in the current study allowed for a simple and accurate measurement of intraoperative cup position and leg length in direct anterior THA.