January 17, 2016
1 min read

Improved function, asymmetrical movement patterns found after THA

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Shortly after surgery, patients who underwent total hip arthroplasty experienced decreased pain, improved function and reduced movement asymmetries; however, at 3 months postoperatively, sit-to-stand movement patterns were distinctly asymmetrical and abnormal, according to results.

Using 3-D motion analysis, researchers compared the sit-to-stand biomechanics of 45 patients with end-stage hip osteoarthritis who underwent total hip arthroplasty (THA) between March 2012 and April 2014 with those of 23 healthy control patients.

Compared with preoperative values, results showed a significant increase in peak vertical ground reaction force, peak hip flexion and peak knee flexion on the operated limb, and a significant decrease on the nonoperated limb for peak vertical ground reaction force and peak hip flexion. Researchers found no significant change for peak knee flexion on the nonoperated side. The nonoperated limb had higher peak vertical ground reaction force and greater peak hip and knee flexion at both preoperative and postoperative time points, according to results.

Although researchers found no significant increase in peak hip adduction on the operated side at 3 months compared with preoperative values and no significant change on the nonoperated side, the nonoperated side had higher peak hip adduction preoperatively and postoperatively compared with the operated limb.

Results showed significant lateral trunk angle preoperatively (3.95°) and 3 months after surgery (2.36°) toward the operated side. According to paired t-test, lateral trunk angle had a significant decrease across time points.

Compared with the control limb, researchers noted lower peak hip and knee flexion on the operated limb. On the nonoperated limb, results showed no significant difference in peak hip flexion between the treatment and control groups, but higher peak knee flexion in the treatment group. – by Casey Tingle

Disclosure: The researchers report no relevant financial disclosures.