THA Kinematics and Sound for Subjects Implanted Using Various Surgical Approaches

The University of Tennessee, Knoxville30 enrolled

Overview

In a previous study conducted within the Center for Musculoskeletal Research (CMR) on Total Hip Arthroplasties (THA), it was determined that the investigators could simultaneously capture in vivo sound and motion of the femoral head within the acetabular cup during weight-bearing activities for subjects implanted with either a metal-on-polyethylene (MOP), metal-on-metal (MOM) or ceramic-on-ceramic (COC) THA. This was the first study to apply sound analysis as an impulse excitation technique for testing hip conditions and for measuring femoral head sliding in the acetabular component of human hip joints by acoustic means. Unfortunately, no studies have been conducted to compare the in vivo kinematics and sound for subjects implanted using various surgical approaches. It could be hypothesized that subjects having various surgical approaches could lead to an increase or reduction of in vivo hip separation. Therefore, the objective of this study is to analyze a total of 30 subjects implanted with either an anterior (10 patients), anterior-lateral (10 patients), or posterior-lateral (10 patients) surgical approach to determine if any of these surgical approaches leads to less or more in vivo hip separation. All subjects will be analyzed under in vivo weight-bearing conditions using video fluoroscopy to determine in vivo motion.

Study Type

OBSERVATIONAL

Enrollment

Conditions

Hip Injuries

Interventions

Eligibility

Sex: ALLMin age: 40 YearsMax age: 85 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Post-operative clinical evaluation judged successful using Harris Hip Scoring (HHS) system (HHS\>90) * Body weight less than 270 lbs * No evidence of post-operative hip subluxation or dislocation * Do not walk with detectable limp * Be able to actively abduct their operated hip against gravity without difficulty * Must be willing to sign Informed Consent and Health Insurance Portability and Accountability (HIPAA) forms Exclusion Criteria: * Pregnant, lactating or females not using reliable form of birth control * Patients that do not meet study requirements * Patients unwilling to sign Informed Consent or HIPAA forms

Locations (3)

University of Maryland St. Joseph Medical Center

Towson, Maryland, United States

Valley Orthopedic Associates ASC

Renton, Washington, United States

University Hospital

London, Ontario, Canada

Outcomes

Primary Outcomes

Kinematics - Swing Phase Separation

Determine amount of in vivo swing phase hip separation present within implanted hip during weight-bearing level walking while under fluoroscopic surveillance.

Time frame: 6 months post-operatively

Kinematics - Stance Phase Separation

Determine amount of stance phase hip separation present in vivo of implanted hip during level walking activity under fluoroscopic surveillance.

Time frame: 6 months post-operative

Kinematics - Overall Separation

Determine overall hip separation present in vivo in implanted hip during level walking activity under fluoroscopic surveillance

Time frame: 6 months post-operative