The Impact of Patellar Tendon Advancement on Knee Joint Moment and Muscle Forces in Patients with Cerebral Palsy.

Patellar tendon advancement (PTA) is performed for the treatment of crouch gait in patients with cerebral palsy (CP). In this study, we aimed to determine the influence of PTA in the context of single-event multilevel surgery (SEMLS) on knee joint moment and muscle forces through musculoskeletal modeling; Methods: Gait data of children with CP and crouch gait were retrospectively analyzed. Patients were included if they had a SEMLS with a PTA (PTA group, = 18) and a SEMLS without a PTA (NoPTA group, = 18).

Functional hip joint centre determination in children with cerebral palsy.

Background: Although functional methods determining the hip joint center (HJC) are becoming increasingly popular, no systematic investigation has been conducted yet to assess the reliability of functional hip joint calibration in patients with cerebral palsy (CP).

Research Question: What is the most reliable way to conduct functional calibration motions for estimating HJC location in children with CP and movement disorders?

Methods: Twenty-two patients with CP were included in the study. A marker set for Plug-in Gait with additional cluster markers was used.

Biomechanical assessment of patellar tendon advancement in patients with cerebral palsy and crouch gait.

Background: Patellar height is a valuable measure to evaluate the effect of patellar tendon advancement (PTA) on knee function. In the literature, there is no validated procedure to measure the patellar height. In this study we aimed to (1) determine the patella position through musculoskeletal modeling, (2) investigate the effects of two surgical procedures applied for PTA, and (3) assess the effect of PTA in combination with single-event multilevel surgery (SEMLS) on the knee kinematics of patients with cerebral palsy (CP) and crouch gait.

Estimation of ankle joint parameters in typically developed adults using functional calibration methods.

Background: Despite of many attempts to determine or correct hip and knee joint parameters via non-invasive techniques such as regression or functional methods, in conventional gait models the position of the ankle joint center still is assumed at the center point between malleoli.

Research Question: The aim of this study was to estimate the ankle joint parameters using a functional approach.

Methods: To this aim, we used data of 23 typically developed adults performing two different calibration motions.