By Tim Davoren, ATC
Anterior knee pain or Patello Femoral Syndrome (PFS) is the most common overuse injury suffered by triathletes, cyclists and runners.
Most hard working triathletes are accustomed to enduring some level of pain. A twitch here; an ache there. No big deal. Likewise with interior knee pain, which begins as generalized pain around or under the kneecap. The onset of PFS can be gradual, or sharp and severe. Most of the time athletes experience it, they brush it off and recover. Then the problem gets worse…
Technically, Patello Femoral Syndrome is the mal-tracking of the kneecap in the femoral groove –the “knuckle” of the femur. This misalignment causes stress to the soft tissue around knee, and eventually can even lead to breakdown of the boney surface of the kneecap or the groove.
The onset of anterior knee pain is generally the combination of factors starting with weakness of the inner quad muscle or Vastus Medialus Obliques (VMO). Tightness or lack of flexibility in hamstrings and the IT Band is also a contributing factor. Likewise, poor orientation of the patella resulting from God-given bone structure contributes to PFS. A greater proportion of woman suffers alignment-related PFS than do men.
Cyclists and runners both have specific issues that result in PFS.
For cyclists:
• The seat height may be too low resulting in a knee angle that is too severe at the bottom of the pedal stroke;
• Pedal/cleat position or angle/width of the cranks may result in pressure on the knee cap;
• Or the saddle position – either forward or aft – may not be set properly also resulting in stress to the knee.
For runners:
• Foot position, specifically the pronation or rolling inward of foot, results in more stress on the knee;
• Terrain is also a factor. Domed roads in particular cause the uphill leg to pronate more to compensate for the leg height differential.
• Similarly, running downhill is a significant stressor on the kneecap due to the eccentric forces on the quad.
The first course of action for triathletes experiencing anterior knee pain is to assess recent changes in training. Consult your training diary to determine which of the many training variables may have changed (volume increase, new equipment, terrain change, etc.). Once identified, discontinue or decrease the specific type of training that may have caused the injury and see if the condition improves. Icing is also an effective technique, although anti-inflammatory medications like ibuprofen are not recommended in large doses if you tend to train through the injury, (exacerbating the condition), small doses for a mild flare up may be helpful.
Of course, the best course of action is to avoid Patello Femoral Syndrome in the first place. This means purchasing the right type of running shoe, obtaining a professional bike fit, proper pre-season strength and stretching, and gradually building volume over time.
If, however, you are sore during a workout or your training is limited by pain, then it's probably time to see a professional.
Treatment for Patello Femoral Syndrome includes the following:
• Strengthening the quads and glutes to control femoral rotation (a strong butt helps control the inward roll of the foot);
• Improving both hamstring and IT Band flexibility (utilizing dynamic warm-up and foam rolling);
• Evaluating foot mechanics (what's happening at the foot and ankle level)
• Obtaining a professional bike fit;
• Assessing your gait mechanics (how you pull your leg forward and push off your foot).
Tim Davoren is the Director of OAPT and clinician at the OAPT clinic. Tim believes firmly in injury prevention has been staffing Certified Athletic Trainers at high schools throughout Southern Maine for 12+ years. Since 2000 he has been the Physical Therapy Instructor in the OA/Maine Medical Center Primary Care Sports Medicine Fellowship Training Program.