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Sexual activity after total hip arthroplasty: a motion capture study.

Caecilia Charbonnier¹, Sylvain Chagué¹, Matteo Ponzoni²

¹Medical Research Department, Artanim Foundation, Geneva, Switzerland.

The Journal of Arthroplasty

|September 11, 2013

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Sexual activity after total hip arthroplasty (THA) poses risks. Certain positions may cause impingement and instability, particularly for women, highlighting the need for careful consideration of hip range of motion post-surgery.

Area of Science:

Orthopedic Surgery
Biomechanics
Rehabilitation

Background:

Sexual activity is an important aspect of quality of life post-total hip arthroplasty (THA).
Objective data on hip range of motion during sexual activities and the associated risks of prosthetic impingement or instability after THA are lacking.
Understanding these risks is crucial for patient counseling and optimizing outcomes.

Purpose of the Study:

To objectively investigate the relative risk of impingement and joint instability during sexual activities following THA.
To determine the hip range of motion required for common sexual positions.
To assess the influence of acetabular component positioning on these risks.

Main Methods:

A motion capture study was conducted with two volunteers simulating 12 common sexual positions.

Keywords:

cup positioning impingement joint instability motion capture sexual activity total hip arthroplasty

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Hip joint kinematics were calculated and applied to 3D prosthetic hip models.

The effect of nine different acetabular cup positions on impingement and instability was evaluated.

Main Results:

Sexual positions requiring high flexion (> 95°) in women led to prosthetic impingement and posterior instability in 6 of 9 cup positions.
Sexual positions requiring significant external rotation (> 40°) in men caused bony impingement and anterior instability across all tested cup positions.
Specific sexual activities pose a quantifiable risk of complications after THA.

Conclusions:

Certain sexual positions can lead to impingement and instability after THA, with higher risks identified for women during high-flexion activities.
Acetabular component positioning plays a role in the occurrence of impingement and instability.
These findings are critical for patient education and managing expectations regarding sexual function after hip replacement.