THA Kinematics and Sound for Subjects Implanted Using Various Surgical Approaches

Completed

Interventions: Radiation: Fluoroscopy surveillance of patients while walking

Brief Summary: 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.

Recruitment & Eligibility

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

Arm && Interventions

Group	Intervention	Description
THA using direct-anterior surgical approach	Fluoroscopy surveillance of patients while walking	Patients will have undergone THA using a direct-anterior surgical approach and will undergo fluoroscopy surveillance while walking.
THA using posterior-lateral approach	Fluoroscopy surveillance of patients while walking	Patients will have undergone THA using a posterior-lateral surgical approach and will undergo fluoroscopy surveillance while walking.
THA using anterior-lateral approach	Fluoroscopy surveillance of patients while walking	Patients will have undergone THA using an anterior-lateral surgical approach and will undergo fluoroscopy surveillance while walking.

Primary Outcome Measures

Name	Time	Method
Kinematics - Swing Phase Separation	6 months post-operatively	Determine amount of in vivo swing phase hip separation present within implanted hip during weight-bearing level walking while under fluoroscopic surveillance.
Kinematics - Stance Phase Separation	6 months post-operative	Determine amount of stance phase hip separation present in vivo of implanted hip during level walking activity under fluoroscopic surveillance.
Kinematics - Overall Separation	6 months post-operative	Determine overall hip separation present in vivo in implanted hip during level walking activity under fluoroscopic surveillance

Secondary Outcome Measures

Name	Time	Method

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