Limits...
Clinical and Functional Outcomes following Primary Repair versus Reconstruction of the Medial Patellofemoral Ligament for Recurrent Patellar Instability.

Tompkins M, Kuenze CM, Diduch DR, Miller MD, Milewski MD, Hart JP - J Sports Med (Hindawi Publ Corp) (2014)

Bottom Line: Results.In addition, there was no side to side difference in torque generation or surface EMG activation of VL or VMO.Conclusions.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthopaedic Surgery, University of Minnesota, 2450 Riverside Avenue South, Suite R200, Minneapolis, MN 55454, USA.

ABSTRACT
Background. The purpose of this study was to compare outcomes of medial patellofemoral ligament (MPFL) repair or reconstruction. Methods. Fourteen knees that underwent MPFL repair and nine (F5, M4) knees that underwent reconstruction at our institution were evaluated for objective and subjective outcomes. The mean age at operation was 20.1 years for repair and 19.8 years for reconstruction. All patients had a minimum of 2 years of follow-up (range: 24-75 months). Patient subjective outcomes were obtained using the International Knee Documentation Committee (IKDC) and Kujala patellofemoral subjective evaluations, as well as Visual Analog (VAS) and Tegner Activity Scales. Bilateral isometric quadriceps strength and vastus medialis obliquus (VMO) and vastus lateralis (VL) surface EMG were measured during maximal isometric quadriceps contractions at 30° and 60° of flexion. Results. There were no redislocations in either group. There was no difference in IKDC (P = 0.16), Kujala (P = 0.43), Tegner (P = 0.12), or VAS (P = 0.05) scores at follow-up. There were no differences between repair and reconstruction in torque generation of the involved side at 30° (P = 0.96) and 60° (P = 0.99). In addition, there was no side to side difference in torque generation or surface EMG activation of VL or VMO. Conclusions. There were minimal differences found between patients undergoing MPFL repair and MPFL reconstruction for the objective and subjective evaluations in this study.

No MeSH data available.


Related in: MedlinePlus

The setup for measuring quadriceps torque generation and surface EMG activation.
© Copyright Policy - open-access
Related In: Results  -  Collection


getmorefigures.php?uid=PMC4590910&req=5

fig2: The setup for measuring quadriceps torque generation and surface EMG activation.

Mentions: All subjects underwent quadriceps strength testing with one consistent researcher experienced with EMG and strength testing. All testing was carried out within one year following the chart review process. We measured bilateral isometric knee extension strength using a multimode dynamometer (Biodex System 3, Shirley, NY). Patient knee, trunk, and hip position were standardized and secured to the chair with straps. The EMG pads were placed over the vastus medialis obliquus (VMO), obliquely oriented just proximal and medial to the patellar base. The vastus lateralis (VL) pad was placed approximately 10 cm proximal to the patellar base and laterally over the muscle belly of the VL, as assessed by palpation during an active knee extension contraction. EMG electrodes were comprised of 2, round, pregelled Ag-AgCl metal discs that were placed on clean, dry skin that was shaved of hair, debrided with a course surface, and cleansed with isopropyl alcohol in order to minimize skin resistance. Electrodes were placed parallel with muscle fiber orientation and at a standard 2 cm interelectrode distance. After multiple practice contractions, each patient performed a 10-second maximal isometric contraction at 60 and 30 degrees of knee flexion (Figure 2). We concurrently recorded VL and VMO surface EMG muscle activation during the maximal tests. Electrodes were placed on shaved, debrided, and cleansed skin, parallel to muscle fiber orientation and approximately 2 cm apart. Signals were amplified, digitized, and processed using a 10-sample moving window root mean square algorithm. The average knee extension torque (normalized to body mass), and corresponding EMG activation from a 5-second time epoch, were calculated for each contraction.


Clinical and Functional Outcomes following Primary Repair versus Reconstruction of the Medial Patellofemoral Ligament for Recurrent Patellar Instability.

Tompkins M, Kuenze CM, Diduch DR, Miller MD, Milewski MD, Hart JP - J Sports Med (Hindawi Publ Corp) (2014)

The setup for measuring quadriceps torque generation and surface EMG activation.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4590910&req=5

fig2: The setup for measuring quadriceps torque generation and surface EMG activation.
Mentions: All subjects underwent quadriceps strength testing with one consistent researcher experienced with EMG and strength testing. All testing was carried out within one year following the chart review process. We measured bilateral isometric knee extension strength using a multimode dynamometer (Biodex System 3, Shirley, NY). Patient knee, trunk, and hip position were standardized and secured to the chair with straps. The EMG pads were placed over the vastus medialis obliquus (VMO), obliquely oriented just proximal and medial to the patellar base. The vastus lateralis (VL) pad was placed approximately 10 cm proximal to the patellar base and laterally over the muscle belly of the VL, as assessed by palpation during an active knee extension contraction. EMG electrodes were comprised of 2, round, pregelled Ag-AgCl metal discs that were placed on clean, dry skin that was shaved of hair, debrided with a course surface, and cleansed with isopropyl alcohol in order to minimize skin resistance. Electrodes were placed parallel with muscle fiber orientation and at a standard 2 cm interelectrode distance. After multiple practice contractions, each patient performed a 10-second maximal isometric contraction at 60 and 30 degrees of knee flexion (Figure 2). We concurrently recorded VL and VMO surface EMG muscle activation during the maximal tests. Electrodes were placed on shaved, debrided, and cleansed skin, parallel to muscle fiber orientation and approximately 2 cm apart. Signals were amplified, digitized, and processed using a 10-sample moving window root mean square algorithm. The average knee extension torque (normalized to body mass), and corresponding EMG activation from a 5-second time epoch, were calculated for each contraction.

Bottom Line: Results.In addition, there was no side to side difference in torque generation or surface EMG activation of VL or VMO.Conclusions.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthopaedic Surgery, University of Minnesota, 2450 Riverside Avenue South, Suite R200, Minneapolis, MN 55454, USA.

ABSTRACT
Background. The purpose of this study was to compare outcomes of medial patellofemoral ligament (MPFL) repair or reconstruction. Methods. Fourteen knees that underwent MPFL repair and nine (F5, M4) knees that underwent reconstruction at our institution were evaluated for objective and subjective outcomes. The mean age at operation was 20.1 years for repair and 19.8 years for reconstruction. All patients had a minimum of 2 years of follow-up (range: 24-75 months). Patient subjective outcomes were obtained using the International Knee Documentation Committee (IKDC) and Kujala patellofemoral subjective evaluations, as well as Visual Analog (VAS) and Tegner Activity Scales. Bilateral isometric quadriceps strength and vastus medialis obliquus (VMO) and vastus lateralis (VL) surface EMG were measured during maximal isometric quadriceps contractions at 30° and 60° of flexion. Results. There were no redislocations in either group. There was no difference in IKDC (P = 0.16), Kujala (P = 0.43), Tegner (P = 0.12), or VAS (P = 0.05) scores at follow-up. There were no differences between repair and reconstruction in torque generation of the involved side at 30° (P = 0.96) and 60° (P = 0.99). In addition, there was no side to side difference in torque generation or surface EMG activation of VL or VMO. Conclusions. There were minimal differences found between patients undergoing MPFL repair and MPFL reconstruction for the objective and subjective evaluations in this study.

No MeSH data available.


Related in: MedlinePlus