I've learned that there is no consensus on how long one should wait for PWB after a TPF fracture.
The most recent study I could find is at http://www.jbjs.boneandjoint.org.uk/...6/817.abstract, and I did purchase the full text, which I can share offline with anyone who'd like to help with further literature research.
The study starts with a survey of the prior literature (relevant footnotes below):
Recommendations vary from non-weight-bearing for 12 to 16 weeks,[4] nonweight-bearing for six to eight weeks,[5] nonweight-bearing prescribed on an individual basis[6] or immediate partial weight-bearing for all patients.[7,8] Encouraged by the results reported for patients who underwent immediate post-operative partial weight-bearing,[7,8] our institution has adopted this rehabilitation strategy. However, there are no data on the effects of weight-bearing on the stability of the fracture, or on how early partial weightbearing might affect the stability over time.
For the study itself, they started seven patients with PWB immediately after surgical plate-and-screw treatment of Schatzker type II lateral TPF's. They went up to 35kg weight in 2 weeks and then "as tolerated without pain." Using radiostereometric imagery analysis (RSA), they found average 0.00mm vertical displacement under load of the plateau fragments at 52 weeks, and 0.34mm total migration. (Migration less than 3mm is considered not to affect outcomes.) Two other studies, involving another 98 patients with a variety of TPFs, also had favorable results, though they had used less precise imaging. A study using RSA on patients who were NWB for 12 weeks showed similar results to this study.
So there seems to be good evidence for early PWB in most cases. In my case, there was complete disagreement between the Operating Surgeon in Salt Lake and my local ortho trauma surgeon. The OS recommended 25/50/100% at 6/8/10 weeks. The local doc considered 12 weeks NWB a Standard of Care and established medical consensus.
Since a look at the literature and websites of trauma practices around the country did reveal a variety of approaches, I've gone with the OS's recommendations.
In fact, today is 10 weeks post-op for me. The PT I went to on a trip last week to CA was emphatic that I should use assistive devices as needed to avoid limping, so I've just gone to one crutch and may try one or two trekking poles. Putting full weight on the leg feels a bit ooky, but there's no pain, and I presume comfort and stability will improve as I get used to actually walking on it again.
In case anyone would like to look them up, here are the footnotes for the part of the study I quote above:
4. Whittle AP. Fractures of the lower extremity. In: Canale ST, Beaty JH, eds. Campbell’s
operative orthopaedics. 11th ed. Vol. 3. Philadelphia: Mosby Elsevier, 2007:3085-236.
5. Cole P, Levy B, Watson JT, Schatzker J. Tibial plateau fractures. In: Browner BD,
Jupiter JB, Levine AM, Trafton PG, Krettek C, eds. Skeletal trauma: expert consultation.
Fourth ed. Vol. 2. Philadelphia: Saunders Elsevier, 2008:2201-87.
6. Egol KA, Koval KJ. Fractures of the tibial plateau. In: Chapman MW, Szabo RM,
Marder R, et al, eds. Chapman’s orthopaedic surgery. Third ed. Vol. 1. Philadelphia: Lippincott
Williams & Wilkins, 2001:737-54.
7. Eggli S, Hartel MJ, Kohl S, et al. Unstable bicondylar tibial plateau fractures: a clinical
investigation. J Orthop Trauma 2008;22:673-9.
8. Russell TA, Leighton RK; Alpha-BSM Tibial Plateau Fracture Study Group. Comparison
of autogenous bone graft and endothermic calcium phosphate cement for
defect augmentation in tibial plateau fractures: a multicenter, prospective, randomized
study. J Bone Joint Surg (Am) 2008;90-A:2057-61.
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