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Anatomical Positions

Anatomical Positions

In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
The body is upright, facing forward, and standing erect.
The feet are parallel and flat on the floor.
The arms are hanging by the...

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Related Experiment Video

Updated: Dec 8, 2025

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve

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Anatomic Total Hip Component Position Is More Reproducible With the Direct Anterior Approach Using Intraoperative

J Ryan Martin¹, John L Masonis², J Bohannon Mason²

¹OrthoCarolina - Matthews, Matthews, NC, USA.

Arthroplasty Today

|September 23, 2020

Summary

The direct anterior approach (DAA) for total hip arthroplasty (THA) resulted in more accurate implant positioning compared to the posterior approach (PA). DAA offers superior leg length and offset restoration for better patient outcomes.

Keywords:

Direct anterior approach Implant position Posterior approach Total hip replacement

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Last Updated: Dec 8, 2025

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Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

Area of Science:

Orthopedic Surgery
Biomechanical Engineering
Radiology

Background:

Total hip arthroplasty (THA) yields excellent results, but surgical approach may influence implant positioning.
The direct anterior approach (DAA) and posterior approach (PA) are common THA techniques.
Hypothesis: DAA with fluoroscopy leads to more anatomic implant positioning than PA.

Purpose of the Study:

To compare the accuracy of anatomic implant positioning between DAA and PA in THA.
To evaluate the impact of surgical approach on leg length, femoral offset, and cup orientation.
To identify potential reasons for differences in implant positioning.

Main Methods:

Retrospective review of 200 THA patients (100 DAA, 100 PA).
Standardized anterior-posterior pelvic radiographs pre- and post-operatively.
Exclusion of patients with contralateral THA or pelvic/femoral deformities.

Main Results:

Preoperative parameters (leg length, offset) were similar between groups.
Postoperatively, DAA showed significantly better restoration of leg length (1.6 vs 5.5 mm) and femoral offset (4.8 vs 9.3 mm).
DAA achieved superior cup abduction (96% vs 78%) and anteversion (69% vs 24%) compared to PA.

Conclusions:

DAA demonstrated significantly more accurate anatomic implant positioning than PA for THA.
Fluoroscopic guidance in DAA and posterior capsule disruption in PA may explain the differences.
DAA may provide more predictable restoration of leg length and offset in THA.