The hip complex srs

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anatomy biomechanics hip joint

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The hip complex srs

  1. 1. THE HIP COMPLEX BIOMECHANICS Sreeraj S R
  2. 2. Articulations of the Hip and Pelvis Sreeraj S R
  3. 3. PROXIMAL ARTICULAR SURFACE• Faces laterally• Faces anteriorly – 18.5o males – 21.5o women• Faces inferiorly – 22o - 42o range – 38o in males – 35o in females Sreeraj S R
  4. 4. Proximal articular surface…• Center Edge angle• Acetabular Anteversion• Acetabular Labrum Sreeraj S R
  5. 5. DISTAL ARTICULAR SURFACE Sreeraj S R
  6. 6. ANGLE OF INCLINATION Sreeraj S R
  7. 7. ANGLE OF TORSION Sreeraj S R
  8. 8. Angle of torsion…..abnormal• Anteversion• Retroversion Sreeraj S R
  9. 9. ARTICULAR CONGRUENCE Sreeraj S R
  10. 10. CAPSULE Sreeraj S R
  11. 11. LIGAMENTS Sreeraj S R
  12. 12. WEIGHT BEARING STRUCTURE Sreeraj S R
  13. 13. ARTHROKINEMATICS Sreeraj S R
  14. 14. OSTEOKINEMATICS Sagittal plane motions of the femur at the hip joint• Flexion: 90o-135o• Extension: 0o-30o• Role of 2 joint muscles? Sreeraj S R
  15. 15. OSTEOKINEMATICS Frontal plane motions of the femur at the hip joint• Abduction: 30o-50o• Adduction: 10o-30o• Role of 2 joint muscles? Sreeraj S R
  16. 16. OSTEOKINEMATICS Frontal plane motions of the femur at the hip joint• IR (extension*) : 35o-45o• IR (flexion**) : 30o-45o• ER (extension*) : 45o-50o• ER (flexion**) : 45o-60o*Extension = Neutral –Terminal**Flexion = 900 Sreeraj S R
  17. 17. OSTEOKINEMATICSmotions of the femur at the hip joint during functional activities Sreeraj S R
  18. 18. OSTEOKINEMATICSSagittal plane Motions of the Pelvis at the Hip Joint Sreeraj S R
  19. 19. OSTEOKINEMATICSFrontal plane Motions of the Pelvis at the Hip Joint Sreeraj S R
  20. 20. OSTEOKINEMATICSTransverse Plane Motions of the Pelvis at the Hip Joint Sreeraj S R
  21. 21. Open Kinematic Chain Motions: Lumbo Pelvic Rhythm Sreeraj S R
  22. 22. Closed Kinematic Chain Motions Sreeraj S R
  23. 23. MUSCULATURE Sreeraj S R
  24. 24. FLEXORS Sreeraj S R
  25. 25. ADDUCTORS Sreeraj S R
  26. 26. EXTENSORS Sreeraj S R
  27. 27. ABDUCTORS Sreeraj S R
  28. 28. LATERAL ROTATORS Sreeraj S R
  29. 29. MEDIAL ROTATORS Sreeraj S R
  30. 30. BILATERAL STANCE• DR & DL : joint axis• WR & WL : body weight• Magnitude of gravitational torque around hip is : WR X DR = WL X DL• Total hip joint Compression = 2/3 X body weight Sreeraj S R
  31. 31. Unilateral Stance• Rt. hip joint compression = 2/3 X W + 1/6 X W or 5/6 X W• Magnitude of gravitational adduction torque at Rt. hip i.e. HATLL torque add = Rt. hip jt. compression X 4”• Magnitude of muscle contraction or Torque abd or Fms = Magnitude of gravitational adduction torque at Rt. hip ÷ 2”• Total joint compression or joint reaction force = Magnitude of muscle contraction + Rt. hip joint compression Sreeraj S R
  32. 32. Ipsilateral Trunk List• Gravitational adduction torque i.e. HATLL Torque add = Rt. hip joint compression X 1• The abduction force needed would be , Torque abd or Fms = HATLL Torque add ÷ 2”• Total joint compression or joint reaction force = Magnitude of muscle contraction + Rt. hip joint compression Sreeraj S R
  33. 33. Ipsilateral Cane • Inman et al suggested that a person can push down on a cane with 15% of his body weight.( body wt. X 0.15) • Magnitude of HATLL = hip jt. compression – body wt. X 0.15 • Torque add = Magnitude of HATLL X 4” • Torque abd = Torque add ÷ 2” • Total joint compression or joint reaction force = Magnitude of muscle contraction + Rt. hip joint compression Sreeraj S R
  34. 34. Contralateral Cane • Magnitude of HATLL = hip jt. Compression – body wt. X 0.15 • Torque add = Magnitude of HATLL X 4” • Counter torque by Latissimus dorsi : Torque Latissimus = body wt. thrugh cane X 8” • Unopposed adduction torque = Torque add – Torque Latissimus • Torque abd or Fms = Unopposed Torque add ÷ 2” • Total joint compression or joint reaction force = Magnitude of muscle contraction + hip joint compression Sreeraj S R

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