The point of this aside relative to the topic of this blog is that I injured by right quad so many times that I had to drop out of track entirely. I'm no newbie to Quadriceps Injuries in general. However, I entered college in 1966 when we wrote with pens and paper, added and subtracted by "thinking" (or more accurately, by counting on fingers and toes) We avoided long division entirely, when possible. There was NO internet -- all research was done by thumbing through the library's card index, then scouring the cavernous building's shelves until you discovered that the sought after book was checked out. With any luck, you might get the information you needed in a few weeks.
So, I knew what my quads were -- and in particular, that they were the most important muscle to speed. A good sprinter's legs work like pistons. You plant one foot, then raise the alternate foot in a straight a motion as possible to near the buttocks. Then you swing the knee/foot/calf/upper legs as a unit forward and quickly extend the foot and plant it on the track, which the process repeats with the other foot. This process of tucking, swinging and planting is the key to every good sprinter's motions. Here's a YouTube video that shows at about 0:48 seconds in slow motion the process I'm describing.
That quadriceps fueled kick is, in a large part what shaves those 1/100's of a second off a sprinter's time that today divides the winner from the "also-rans". I was fortunate to be tutored in the science of sprinting by a pioneer in the field, Cliff Abel, who later became head track and field coach at Cal State Northridge -- they fondly refer to him as "legendary men's track & field head coach". At the time, immature ingrate that I was, had no appreciation of his coaching talent. I'm glad he's been appropriately recognized by those more discerning that I was at that age.
But back to ruptured quadriceps tendons.
I never ruptured a tendon during my running career. My injuries at the time were confined to "pulled muscles", or tears in the muscle fiber -- serious enough, but not, on their own, totally debilitating. This was all in a time before the now well known pulled muscle treatment acronym -- RICE: rest, ice, compression, elevation. In fact, I don't recall any treatment at all beyond rest and limping for a few weeks.
Also, I was complicit in that I didn't like excessive warm up, despite Coach Abel's admonitions. To make matters worse, our early season track meets were in the Spring, when temperatures in the region were often in the 40s, 50s or 60s, at best. (By the end of the season, you could iron pants n the sidewalk, but in March you wouldn't take off those pants to iron them!) Also, my muscles are a little too short for my bones, I guess... the muscles always seemed to be stretched a little tightly.
I'm certain that although I didn't suffer actual ruptured tendons, the fact that I DID have repeated torn quads also suggests that there was a trap being laid.
Quadriceps Tendon damage is often referred to a "runner's knee", "jumper's knee", etc. Those who are most prone to this injury are runners, volleyball players, basketball players... anything that subjects a bended knee to repeated abuse. When these athletes mature (that is get older... some never mature), their knees are most prone to tendon damage.
I've now learned a lot about the knee, and associated ligaments, tendons, cartilage and its general engineering. Had I studied this earlier, I might have done a few things that might have prevented this.
Heading up the list -- LOSE WEIGHT. When you use the quadriceps muscles to, say, climb stairs, you place the entire weight of your upper body (about 80% of your total body weight) on the quadriceps tendons. Here's a diagram of the apparatus:
So, in order lift your self one stair step, you contract your Quadriceps Muscle, which pulls on the Quadriceps Tendon, which is draped over the Patella (Knee Cap), and pulls up on the Patellar Tendon, which is, in turn, connected to the Tibia (or Shin Bone)... sort of like the action of a backhoe loader where the hydraulic cylinders are replaced by tough little pieces of tissue called Tendons.
Probably as the result of a combination of my age, my "runners knee", fatigue, and poor warm up -- racquetball is famously hard on knees, too. This is article explains the nature of the injury much better than I can -- plus there's some good, grizzly, CSI type photos of an open incision with tendons and all: Quadriceps Tendon Rupture
Another good read is Michael LaBossiere's "Quadriceps Tendon Rupture" blog... full of information, entertaining and well written.
PART III: Getting Treatment -- How I Did It vs. How it Should Be Done