Table 2

Number of postmarathon lesions in different structures before and after the marathon/training, in 142 knees of 71 marathon runners and 22 knees of 11 non-marathon runners

Knee abnormalities per structure	Marathon runners (n=142 knees)			Non-marathon runners (n=22 knees)
	Number of Post-M lesions		Significant change from Pre-M	Number of Post-M lesions		Significant change from Pre-M
	New/ Worsened*	Improved†	Significant change from Pre-M	New/ Worsened	Improved	Significant change from Pre-M
Meniscal tears	1	0	n.s.	0	0	n.s.
Cartilage lesions	25	2	Lateral patella p=0.0005*	4	0	n.s.
Patello-femoral	21	1		3	0
Tibio-femoral	4	1		1	0
BME lesions	26	23	Medial tibia p=0.011†	3	3	n.s.
Patello-femoral	19	2		3	1
Tibio-femoral	7	21		0	2
Tendon lesions	13	2	Semimembranosus p=0.016*	2	0	n.s.
Ligament lesions	2	2	n.s.	0	0	n.s.
ITBFS	15	0	ITB p<0.0001*	1	1	n.s.
Prepatellar bursitis	7	0	Prepatellar bursitis p=0.016	1	0	n.s.

All abnormalities were recorded including Grade 1 abnormalities (all grades different from 0 were defined as ‘lesions’). P values<0.05 indicate significant changes in the knees between the premarathon and postmarathon time points.See online supplementary appendices 2 and 4 for further details.
*Indicate significant worsening.
†Indicate significant improvement in the extent of lesion.
BME, bone marrow oedema; ITBFS, iliotibial band friction syndrome; n.s., not significant; Post-M, post-marathon; Pre-M, pre-marathon.