Update after the latest bike fit:

Leg length discrepancy 1cm shorter left
Saddle lowered to 72cm (cleats moved further back so effective 72.5cm compared to original position)
saddle pushed back from 5.8mm setback to 6.8mm
The drops to the bars are 3cm
Shimming on the left foot 6mm + the angled wedge I made has been kept in place.

Recommended I but some Shimano RC7 shoes as they'll help with foot pain as I need wider shoes and also insoles as I have flat feet.

My left leg has smaller quads, well to the right of it I can definitely notice this, I'm assuming this might be because I've not been able to get power down which makes sense, my right leg is fine no issues, and that's the side that is the most stable.

Initial ride I experienced pain the the upper right of my left knee, this I would expect is that smaller muscle compared to the right , I'm now putting power through that leg more so it's going to have to get used to it, I assume by me doing longer steadier miles as pushing my usual 250 to 300w causes the pain.

Do you use cleats? Are you sure the cleat isn't keeping your foot at the unique angle that you and only you alone need at both the top and bottom of your pedal stroke?

My left and right foot have do not sit anywhere near the same angle on the pedals. On foot the heal to toe line is almost straight and parallel to the bikes centerline. The other is angled with the heel much closer. It does make a difference. Recently I had a cleat come loose and I got it with the wrong angle. While my knee felt good when extended, on the up stroke, I could feel a little twist that was becoming annoying. So I stopped and adjusted my cleat.

Did you ever say whether your saddle height is measured to the pedal at its downstroke or to the BB?

I'm surprised no one has suggested seeing a physical therapist for the purpose of ascertaining the underlying problem which is causing your unusual slide to the left.

Is it a slight misalignment of the leg after your previous fractures? Is it a shorter leg? Is it a lack of flexibility in one or more knee, hip, or ankle joint? These are all things that a physical therapist can check out for you. Once you know the underlying problem(s) then you and the bike fitters will have much better ideas of which way to go with your position on the bike.
Brent

Is a physical therapist a physiotherapist? If so I'm going to be referred the one on the NHS, not hoping for much but we'll see.

I am concerned about the leg length discrepancy I really don't think I had this 2 years ago, it's developed over the past 2 years I think.

Since you ask, I had to look too. Physical Therapy and Physiotherapy: What is the difference?


Steve Hogg had some articles on bike fit that he mentioned leg length descrepancies and in some cases they were just that the person had developed bad habits and how they held their hips or something that a physiotherapist or physical therapist was able to fix and then Steve Hogg was able to solve the fit issues.

Can't find that article though. But he has a lot of interesting reads if you like to dig through the various stuff he has written. https://www.stevehoggbikefitting.com/index/

I'm expecting I'll need another bike fit in a year or two.

I'm going to see what the physio can do, and I've been looking at some "yoga for cyclists" videos on YouTube that were recommended, it's bloody hard but kind of feels good.

I'm going to see if the physio and the yoga and regular stretching does anything. If anything I can only imagine as my bike fit changes because I stretch more than I shouldn't start to feel pain , well I'd hope not as technically I should become more flexible.

But I'm hoping as time goes by I can remove the shimms. It's a bigger shimming for my commuter with SPD cleats.

Riding takes a lot of thinking currently I need to make sure o relax the heel and allow it to point inwards and allow my knee to point slightly putwards on the to of the stroke, doing this and I have much more stability.

I've literally gained 30w average without really pushing more, that additional power just brings in line with my form, mostly it's from been more consistent on the pedals I think.

Just thought I'd post here rather than a new thread. I caved in the end, was seeing a physio, he could see one hand is resting against my hip whilst the other is floating in the air (when stood) which shows one side of my pelvis is higher than the other. Leg length seems to be about 1.2cm different (left shorter).

I've gone to see a chiropractor and he made some adjustments (a hell of a lot of cracking occurred), he told me this is temporary (probably worn off by now) and I'm awaiting on what he details based on his assessment are, he'll then give me a plan of action to help me reduce the symptom.

In the meantime I try get out 2 to 3 times a week, I can only manage 20 miles, maybe 30-40 if I'm really lucky, always in lots of pain by the end of it, a lot slower as I've gained 2 stone since a year ago. It's like a train wreck cycling life just hope I can recover, especially now juggling fitness with a baby son and angry girlfriend.