Clinical and Functional Outcomes at Least 2 Years After Hamstring Muscle Repair

Summary

This study is to evaluate functional outcomes of a new, intraoperative lateral positioning of the anchors on the tuber ischiadicum, in comparison to regular anatomical anchoring direct on top of the tuber ischiadicumafter hamstring muscle repair. This study is to quantify at least 2 years postoperative functional, biomechanical and clinical outcomes including side-to-side differences in muscle strength, unipedal balance, gait, jumping and squatting function, muscle activity, in patients treated by hamstring muscle repair.

Conditions

• Hamstring Muscle Repair
• Hamstring Rupture

Interventions

OTHER

data collection by health questionnaires

Health questionnaires to assess scores concerning pain and function of the treated leg and overall health

OTHER

assessment of muscle strength

Muscle strength will be measured bilaterally using a dynamometer (Biodex System 4 Pro: Biodex Medical Systems, Shirley, NY, USA). For the knee, maximum isokinetic flexion and extension torques will be collected between full extension and full flexion at a movement speed of 60°/s (5 repetitions) and 240°/s (15 repetitions). Maximum joint torques in each movement direction will be recorded for each joint and normalized to body weight.

OTHER

assessment of gait

Instrumented gait analysis on a treadmill with an embedded plantar pressure plate (h/p/cosmos, Zebris FDM-T, Isny, Germany; 7168 sensors; area, 1.5 \* 0.5 m; range, 1-120 N/cm2; precision, 1-120 N/cm2 ± 5%; sampling rate, 120 Hz) and on an overground walkway with two embedded force plates (Kistler force plate 9260AA6, Kistler AG, Winterthur, Switzerland; sampling rate 2400 Hz). Simultaneously with the plantar pressure or force data, kinematic and electromyographic (EMG) data will be collected. Participants will then walk for 1 minute at their preferred walking speed (0% slope and at 15% slope) and at 1.2 m/s (0% slope). For all conditions, kinematic, EMG and pressure data will be recorded for 1 minute. Subsequently, the treadmill speed will be increased to preferred running speed and 2.3 m/s (0% slope), and data for 1 minute running will be recorded. Subjects will then complete overground walking and running trials on the walkway with embedded force plates.

OTHER

assessment of squatting and single leg hops

Participants perform three jumps on a force plate. Maximum jump length, Maximum flexion and extension angles and joint moments will be identified. Subsequently, participants perform three squats onto two force plates (one per foot). On- and off times will be computed for each muscle and condition.

OTHER

assessment of postural stability

The length of the centre of pressure path will be measured during two 30-second unipedal stance trials using a force plate.

Sponsors & Collaborators

• University Hospital, Basel, Switzerland

  lead OTHER

Principal Investigators

• Karl Stoffel, Prof. Dr. med. · Department of Orthopaedics and Traumatology, University Hospital Basel

Eligibility

Min Age

18 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2020-12-02

Primary Completion

2021-04-15

Completion

2021-04-15

Countries

• Switzerland

Study Locations